Multitech SocketModem MT5600SMI, SocketModem MT5656SMI Reference Manual

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SocketModem

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SocketModem

AT Commands

MT5600SMI

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MT5656SMI

Fax Commands

Voice Commands

Reference Guide

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SocketModem Reference Guide

MT5600SMI and MT5656SMI S000306C, Rev. C

This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech Systems, Inc. All rights reserved. Copyright © 2002-2006, by Multi-Tech Systems, Inc.

Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically disclaim any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.

Revisions

Revision Level Date Description

A 09/04/03 First release. B 06/04/04 Created a separate Universal Socket Hardware guide and a separate AT

Command Reference Guide.

C 01/12/06 Added a chapter that covers setting country/regional codes. Clarified the

default for Command B and S-Register S27 (bit 6).

Patents

This device covered by one or more of the following patents: 6,219,708; 6,031,867; 6,012,113; 6,009,082; 5,905,794; 5,864,560; 5,815,567; 5,815,503; 5,812,534; 5,809,068; 5,790,532; 5,764,628; 5,764,627; 5,754,589; 5,724,356; 5,673,268; 5,673,257; 5,644,594; 5,628,030; 5,619,508; 5,617,423; 5,600,649; 5,592,586; 5,577,041; 5,574,725; 5,559,793; 5,546,448; 5,546,395; 5,535,204; 5,500,859; 5,471,470; 5,463,616; 5,453,986; 5,452,289; 5,450,425; 5,355,365; 5,309,562; 5,301,274 Other Patents Pending.

Trademarks

Registered Trademarks of Multi-Tech Systems, Inc. are SocketModem and the Multi-Tech logo. Microsoft and Windows are registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. All other trademarks are owned by their respective companies.

World Headquarters

Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, Minnesota 55112 Phone: 763-785-3500 or 800-328-9717 Fax: 763-785-9874

Technical Support Country By Email By Phone

France: support@multitech.fr (33) 1-64 61 09 81 India: support@multitechindia.com 91 (124) 6340778 U.K.: support@multitech.co.uk (44) 118 959 7774 U.S. and Canada: oemsales@multitech.com (800) 972-2439 Rest of the World: oemsales@multitech.com (763) 717-5863

Internet Address: http://www.multitech.com

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Table of Contents

Contents

Chapter 1 – AT Commands, S-Registers and Result Codes....................................................................4

Introduction................................................................................................................................................ 4

Escape Code Sequence – +++ .................................................................................................................4

Data Commands........................................................................................................................................ 5

Generic Modem Control Commands ..................................................................................................... 5

DTE-Modem Interface Commands.......................................................................................................... 11

Call Control Commands .......................................................................................................................... 16

Modulation Control Commands...............................................................................................................26

Error Control Commands......................................................................................................................... 30

Data Compression Commands ...............................................................................................................35

V.8/V.8bis Commands.............................................................................................................................38

Diagnostic Commands ............................................................................................................................ 40

Example Modem Response and Usage .............................................................................................. 44

Compatibility Commands......................................................................................................................... 45

Fast Connect Commands........................................................................................................................46

V.92 +P and –Q Commands ...................................................................................................................47

S-Registers.............................................................................................................................................. 51

Result Codes ........................................................................................................................................... 59

Chapter 2 – Fax Class 1 Commands.........................................................................................................62

Fax I/O Processing .................................................................................................................................. 62

DTE-to-Modem Transmit Data Stream ................................................................................................ 62

Modem-to-DTE Receive Data Stream.................................................................................................62

Fax Mode Selection ............................................................................................................................. 63

Fax Origination..................................................................................................................................... 63

Fax Answering .....................................................................................................................................63

Fax Control Transmission .................................................................................................................... 63

Fax Control Reception .........................................................................................................................64

Fax Data Transmission ........................................................................................................................ 65

Fax Data Reception .............................................................................................................................65

Commands and Parameters ................................................................................................................... 66

Mode Entry Commands ....................................................................................................................... 66

Mode Commands................................................................................................................................. 66

Service Class 1 Commands .................................................................................................................... 70

Examples................................................................................................................................................. 74

Chapter 3 – Fax Class 2 Commands.........................................................................................................76

Command and Syntax Guidelines...........................................................................................................77

Mode Entry Commands ....................................................................................................................... 77

DTE Commands ..................................................................................................................................77

Serial Port Speed and Flow Control ....................................................................................................78

Auto Answer......................................................................................................................................... 79

Identification of T.30 Options ............................................................................................................... 79

Session Status Reporting ....................................................................................................................79

Procedure Interrupt Negotiation........................................................................................................... 79

Service Class 2 Identification and Selection ........................................................................................... 80

Service Class 2 Action Commands ......................................................................................................... 81

Service Class 2 DCE Responses............................................................................................................ 88

Service Class 2 Parameters .................................................................................................................... 91

Example Sessions ................................................................................................................................... 95

Chapter 4 – Voice Commands...................................................................................................................97

Voice Commands Overview .................................................................................................................... 97

<DLE> Shielded Event Codes Sent to the DTE .................................................................................. 98

<DLE> Shielded Codes Sent to the Modem (DCE)............................................................................. 99

Voice Configuration Commands............................................................................................................ 100

Basic Voice Commands ........................................................................................................................101

Chapter 5 – Setting Country or Regional Codes...................................................................................112

Index...........................................................................................................................................................113

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Chapter 1 – AT Commands, S-Registers and Result Codes

Chapter 1 – AT Commands, S-

Registers and Result Codes

Introduction

The AT commands are used to control the operation of your modem. They are called AT commands because the characters AT must precede each command to get the ATtention of the modem.

AT commands can be issued only when the modem is in command mode or online command mode. The modem is in command mode whenever it is not connected to another modem. The modem is in data mode whenever it is connected to another modem and ready to exchange data. Online com mand mode is

a temporary state in which you can issue commands to the modem while connected to another modem.

To put the modem into online command mode from data mode, you must issue an escape sequence (+++) followed immediately by the AT characters and the command, e.g., +++ to hang up the modem. To return to data mode from online command mode, you must issue the command ATO.

To send AT commands to the modem, you must use a communications program, such as the HyperTerminal applet in Windows 98 and NT 4.0, or some other available terminal program. You can issue commands to the modem either directly, by typing them in the terminal window of the communications program, or indirectly, by configuring the operating system or communications program to send the commands automatically. Fortunately, communications programs make daily operation of modems effortless by hiding the commands from the user. Most users, therefore, need to use AT commands only when reconfiguring the modem, e.g., to turn autoanswer on or off.

The format for entering an AT command is ATXn, where X is the command, and n is the specific value for the command, sometimes called the command parameter. The value is always a number. If the value is zero, you can omit it from the command; thus, AT&W is equivalent to AT&W0. Most commands have a default value, which is the value that is set at the factory. The default values are shown in the “AT

Command Summary” (See below).

You must press ENTER (depending on the terminal program it could be some other key) to send the command to the modem. Any time the modem receives a command, it sends a response known as a

result code. The most common result codes are OK, ERROR, and the CONNECT messages that the

modem sends to the computer when it is connecting to another modem. See “Result Codes” at the end of this chapter for a table of valid result codes.

You can issue several commands in one line, in what is called a command string. The command string begins with AT and ends when you press ENTER. Spaces to separate the commands are optional; the command interpreter ignores them. The most familiar command string is the initialization string, which is

used to configure the modem when it is turned on or reset, or when your communications software calls another modem.

Escape Code Sequence – +++

When the modem has established a connection and has entered online data mode, it is possible to break into the data transmission in order to issue further commands to the modem in an online command mode. This is achieved by the DTE sending to the modem a sequence of three ASCII characters specified by SRegister S2. The default character is '+'. The maximum time allowed between receipt of the last character of the three-escape character sequence from the DTE and sending of the OK result code to the DTE is controlled by the S12 register.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Data Commands

The modem will respond to the commands detailed below. Parameters applicable to each command are listed with the command description.

Generic Modem Control Commands

Command: Z Soft Reset and Restore Profile

Description: Causes the modem to perform a soft reset and restore (recall) the

configuration profile. If no value is specified, zero is assumed. Default: None Values: Number corresponding to the selected profile: Z0 Soft reset and restore stored profile 0. Z1 Soft reset and restores stored profile 1. Result Codes: OK Otherwise ERROR

Command: +FCLASS Select Active Service Class

Description: Selects the active service class (mode). Default: 0 Defined Values: +FCLASS=0 Select Data Mode (Default). +FCLASS=1 Select Facsimile Class 1 Mode. +FCLASS=1.0 Select Facsimile Class 1.0 Mode. +FCLASS =2 Fax Service Class 2 +FCLASS=2.0 Fax Service Class 2.0 +FCLASS=2.1 Fax Service Class 2.1 +FCLASS=8 Select Voice Mode. +FCLASS=10 Reserved.

Note: Fax Class 2 and Voice Mode apply to MT5656SMI only

Result Codes: OK Otherwise ERROR Report Commands: +FCLASS? Reports Current or Selected Values

+FCLASS=? Reports Range of Parameters

Command: +VCID Caller ID (CID)

Description: Controls the reporting and presentation of data associated with the Caller

Default: 0 Defined Values: +VCID0 Disable Caller ID reporting. +VCID1 Enables Caller ID with formatted presentation to the DTE. The

+VCID2 Enables Caller ID with unformatted presentation to the DTE.

Report Commands: +VCID?

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+VCID=? Reports Range of Parameters

ID services in the Incoming Call Line ID (ICLID) data format for the next

call. (U.S. only)

modem presents the data items in a <Tag><Value> pair format. The expected pairs are date, time, name, and caller code (telephone number).

Reports the Mode

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: +VRID Report Retrieved Caller ID (CID)

Description: Reports the data associated with the Caller ID services in the Incoming

Caller Line (ICLID) data format for the last received call. U.S. only Default: None Defined Values: +VRID0 Reports Caller ID with formatted presentation to the DTE. The

modem presents the data items in a <Tag><Value> pair format. The expected pairs are date, time, name, and caller code (telephone number).

+VRID1 Reports Caller ID with unformatted presentation to the DTE.

Report Commands: +VRID?

Reports the Mode

Command: \N Operating Mode - Error Correction

Description: Controls the preferred error-correcting mode to be negotiated in a

subsequent data connection. This command is affected by the OEM

firmware configuration. Default: 5 Defined Values: \N0 Selects normal speed buffered mode (disables error-correction

mode). (Forces &Q6.)

\N1 Serial interface selected: Selects direct mode and is equivalent to

&M0, Q0 mode of operation. (Forces &Q0.) Parallel interface selected: Same as \N0.

\N2 Selects reliable (error-correction) mode. The modem will first attempt

a LAPM connection and then an MNP connection. Failure to make a reliable connection results in the modem hanging up. (Forces &Q5, S36=4, and S48=7.)

\N3 Selects auto-reliable mode. This operates the same as \N2 except

failure to make a reliable connection results in the modem falling back to the speed buffered normal mode. (Forces &Q5, S36=7, and S48=7.)

\N4 Selects LAPM error-correction mode. Failure to make an LAPM

error-correction connection results in the modem hanging up.

(Forces &Q5 and S48=0.) Note: The -K1 command can override the

\N4 command.

\N5 Selects MNP error-correction mode. Failure to make an MNP error-

correction connection results in the modem hanging up. (Forces

&Q5, S36=4, and S48=128.) Result Codes: OK Otherwise ERROR

Command I Identification

Description: Causes the modem to reports the requested result according to the

command parameter. Default: None Defined Values: I0 Reports product code (e.g., 56000). I1 Reports the least significant byte of the stored checksum (e.g.,

12AB).

I2 Checks ROM and verifies the checksum. Reports OK or ERROR. I3 Reports ROM Code Revision-Modulation (e.g., 2109-V90). I4 Reports OEM defined identifier string in binary format (default) or

ASCII formats. (e.g.: a007040284C6002F bC60000000

r1005111151012000 3000111170000000). I5 Reports Country Code parameter (see +GCI). I6 Reports modem data pump model and internal code revision. Result Codes: OK Otherwise ERROR

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Command: +GMI Request Manufacturer Identification

Description: Causes the modem to report the modem product manufacturer. Typical Response: +GMI: Multi-Tech OK

Command +GMM Request Model Identification

Description: Causes the modem to report the modem product. Typical Response: +GMM: V92

Command: +GMR Request Revision Identification

Description: Causes the modem to report the modem version, revision level, or date.

This is the same as the I3 command. Typical Response: +GMR: P2109-V90 OK

Command: +GCAP Request Complete Capabilities List

Description: This extended-format command causes the modem to transmit one or

more lines of information text listing additional capabilities command

+<name>s, which is intended to permit the user to identify the overall

capabilities of the modem. In particular, if the modem implements a

particular modem control standard that uses Extended Syntax Commands,

and if that modem control standard includes command(s) that indicate

general capabilities, the +<names>(s) of those commands will be reported

to the modem in response to a +GCAP command. Example Responses: +GCAP: +FCLASS, +MS, +ES, +DS, for a data modem that supports all

capabilities listed. Where: +MS +M commands (Modulation Control: +MS and +MR commands) +ES +E commands (Error Control: +ES, +EB, +ER, +EFCS, +ETBM) +DS +D commands (Data Compression: +DS and +DR). Manual

Command: +GCI Country/Region of Installation

Description: This extended syntax command selects and indicates the country or region

of installation for the modem. This parameter selects the settings for any

operational parameters that need to be adjusted for national regulations or

telephone networks. The chapter Setting Country Codes for more

information. Default: If the modem is specified for use in only one country, that country code is

the default. Otherwise, the default is defined by the OEM. Factory default is

B5 (United States). Report Commands: +GCI? Reports the current country code. +GCI=? Displays the list of available country codes.

Command: &F Restore Factory Configuration (Profile)

Description: The modem loads the factory default configuration (profile). The factory

defaults are identified for each command and in the S-Parameter

descriptions. A configuration (profile) consists of a subset of S-Parameters. Default: None Values: &F0 Restore factory configuration 0. &F1 Restore factory configuration 1. Result Codes: OK ERROR if the modem is connected.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: &T Local Analog Loopback Test

Description: The modem will perform the local analog loopback test if &T1 is selected.

The test can be run only when in an asynchronous operation in non-error-

correction mode (normal), e.g., AT&Q6. To terminate the test in progress,

the escape sequence must be entered first. Default: None Defined Values: &T0 Terminates test in progress. Clears S16. &T1 Initiates local analog loopback, V.54 Loop 3. Sets S16 bit 0. If a

connection exists when this command is issued, the modem hangs up. The CONNECT XXXX message is displayed upon the start of the test.

Command: &Y Designate a Default Reset Profile

Description: Selects which user profile will be used after a hard reset. Default: None Defined Values: &Y0 The modem will use profile 0. &Y1 The modem will use profile 1. Result Codes: OK ERROR if <value> > is1 or if NVRAM is not installed or is not operational.

Command: &W Store Current Configuration

Description: Saves the current (active) configuration (profile), including S-Parameters,

in one of the two user profiles in NVRAM as denoted by the parameter

value. This command will yield an ERROR message if the NVRAM is not

installed or is not operational as detected by the NVRAM test. The current configuration is comprised of a list of storable parameters

illustrated in the &V command. These settings are restored to the active

configuration upon receiving a Z command or at power up (see &Y

command). Default: 0 Defined Values: &W0 Store the current configuration as profile 0. &W1 Store the current configuration as profile 1. Result Codes: OK Otherwise ERROR

Command &Zn=x Store Telephone Number

Description: The modem can store up to four telephone numbers and each telephone

number dial string can contain up to 31 digits. (Requires 256-byte NVRAM

installed.) Default: None Defined Values: <string> Dial string from 0 to 31 characters. Result Codes: OK For <value> =3, and <string> =31 digits. ERROR If <value> > 3, <string> > 31 digits, or if NVRAM is not installed or

is not operational.

Command %7 Plug and Play Serial Number

Description: Sets and stores eight serial numbers in hex format used for serial Plug and

Play and for ISA Plug and Play which use the Conexant 11596 Plug and

Play device. Applicable to Desktop configuration only. Example: %7<8 hex numbers><same 8 hex numbers> Result Codes: OK <8 hex numbers><same 8 hex numbers> Otherwise ERROR Report Command: AT"? Reports the stored serial number, issue.

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command %8 Plug and Play Vendor ID and Product Number

Description: Sets and stores Vendor ID and product number for serial Plug and Play

and for ISA Plug and Play which use the Conexant 11596 Plug and Play

device. Applicable to Desktop configuration only. Default: None Example: %8<3 ASCII characters><4 hex numbers><same 3 ASCII

characters><same 4 hex numbers><cr> Result Codes: OK <3 ASCII characters><4 hex numbers><same 3 ASCII

characters><same 4 hex numbers> Otherwise ERROR

Command ** Load Flash Memory

Description: The linear flash memory uploader allows flash memory connected to the

modem external memory bus to be upgraded with revised modem

firmware. This process transfers (uploads) the upgraded modem firmware

(data) from the host computer to the modem which transfers the data to the

flash memory device. The linear flash memory downloader allows the flash

memory connected to the modem external memory bus to read and saved.

This process transfers (downloads) the current modem firmware (data) to

the host computer. Uploading new firmware to the flash memory or

downloading existing firmware from the flash memory device is a two-step

process.

1. When the AT** command is issued, the modem firmware boot loader is

invoked and the user will first load a flash load module (FLM) into the modem's RAM. If the user wishes to upload new firmware to the modem, he should load the uploader FLM. If the user wishes to download existing firmware from the modem, he should load the downloader FLM. In either case, the data transfer is done via an ASCII transfer. The FLM contains the programming algorithm for the flash memory device being programmed and any messages that may be sent during the load process.

2. If the user wishes to upload new firmware to the modem, then he will

then load the new modem firmware, which the uploader FLM will then program into the flash memory device. This transfer is done via XMODEM transfer. If the user wishes to download existing firmware from the modem, then he will set up the host PC for XMODEM receive and the downloader FLM will begin to send the existing firmware from the flash memory to the host PC.

Procedure

1. Install in the modem a flash memory programmed with the modem

firmware or a blank flash memory.

2. Put the uploader FLM and downloader FLM files and the new modem

firmware file (e.g., XmUL003.s37, XmDL003.s37, and 206s4712.S37) in an appropriate directory on the computer's hard disk.

3. Configure the communications application program for a DTE rate of

between 9600 bps and 115200 bps and RTS/CTS flow control.

4. Check the modem for response by typing AT.

5. Initiate the download process using the AT** command. The

"Download flash code…" message appears upon issuing the AT** command.

6. Perform an ASCII transfer of the FLM file (e.g., XmUL003.s37 for

uploading new firmware to the modem or XmDL003.s37 for downloading existing firmware from the modem) from the host computer to the modem RAM using an industry standard communications software or an equivalent process (ensure that all ASCII translation or pacing is turned off).

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Chapter 1 – AT Commands, S-Registers and Result Codes

7. After the FLM has been loaded, if uploading new firmware to the

modem, perform an XMODEM upload of the new modem firmware hex file (e.g., 206s4712.S37) from the host computer to the modem RAM using industry standard communications software or an equivalent process. If downloading existing firmware from the modem, using an industry standard communications software or equivalent, put the host PC in XMODEM receive mode.

8. The messages described in Table 1-1 may occur during the uploading

process:

Table 1-1. Upload Messages

Message Description

Device not supported Displayed if the FLM used does not support the flash

memory that is installed on the board.

Wrong S37 format Displayed if the modem firmware being uploaded is not in

Motorola S3 format.

Record error Displayed if there is an error while either uploading or

downloading. If this occurs, the transfer should be aborted, and the user should restart at step .5

Download abort Displayed if the transfer is aborted before it is finished. If this

occurs, the user should restart at step 5.

Erase fail Displayed if the FLM is unable to erase the flash memory. If

this occurs, the user should restart at step 5. Download error, ReLoad

Displayed if there was an error when uploading or

downloading. If this occurs, the user should restart at step 5. Error, No H/W flow ctl Displayed if RTS-CTS flow control is not set. If this occurs,

the user should restart at step 3. DTE timeout Displayed if the DTE has stopped the XMODEM transfer

process before it is finished. If this occurs, the user should

restart at step 5. Code doesn’t match Hardware

Displayed if the user is attempting to upload a firmware that

either not the same model (parallel, serial, etc.), crystal

frequency, or size (1Mbit, 2Mbit, etc.) as the firmware that is

currently on the board. If this occurs, the FLM will abort and

not allow the user to continue. Device successfully Programmed

Displayed by the FLM at the completion of a successful

upload or download then the modem will do a cold start.

The uploader and downloader flash load modules (FLM) have several built in safety

mechanisms to reduce the risk of a failed flash upload/download. The FLM will not allow a user to upload a firmware of different model (serial, parallel, etc.) or crystal speed than what is currently in the flash memory. Also, it will not allow the user to upload a firmware that is larger in size than the flash memory itself (e.g., a 2Mbit firmware onto a 1Mbit flash memory). It will, however, allow the user to upload a firmware that is smaller in size than the flash memory, and it will program the firmware with the appropriate offset in order for the firmware to function properly. In the instance that there is a failure during the download or upload process, the modem will be in a “flash rescue mode”. In this mode, the modem will respond “OK” to all AT commands, but will only take action on the AT** command, so a new attempt to upload or download can be initiated. When the modem is in the “flash rescue mode” it will only be able to respond to AT commands if the DTE rate has not been changed since the last AT** command was successfully issued, even if the modem is powered off and on.

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Chapter 1 – AT Commands, S-Registers and Result Codes

DTE-Modem Interface Commands

The parameters defined in this section control the operation of the interface between the DTE and modem.

Command: E Command Echo

Description: The modem enables or disables the echo of characters to the DTE. The

parameter value, if valid, is written to S14 bit 1. Default: 1 Defined Values: E0 Disables command echo. E1 Enables command echo. Result Codes: OK Otherwise ERROR

Command: Q Quiet Result Code Control

Description: Enables or disables the sending of result codes to the DTE. The parameter

value, if valid, is written to S14 bit 2. Default: 0 Defined Values: Q0 Enables result codes to the DTE. Q1 Disables result codes to the DTE. Result Codes: OK Otherwise ERROR

Command: V Result Code Form

Description: Selects the sending of short-form or long-form result codes to the DTE.

The parameter, if valid, is written to S14 bit 3. Default: 1 Defined Values: V0 Enables short-form (terse) result codes. Line feed is not issued

before a short-form result code. V1 Enables long-form (verbose) result codes. Result Codes: OK Otherwise ERROR

Command: W Connect Message Control

Description: This command, in conjunction with S95 bits 0, 2, 3, and 5 (bits 2, 3, and 5

can be written directly by the host or by the +MR, +ER, and +DR commands, respectively), control the format of CONNECT messages. The actual result code messages reported reflect the W command setting and the S95 bit settings. (Also see +MR, +ER, and +DR commands.) The W

parameter value, if valid, is written to S31 bits 2 and 3. Default: 0 Defined Values: W0 Upon connection, the modem reports only the DTE speed (e.g.,

CONNECT 19200). Subsequent responses are disabled.

W1 Upon connection, the modem reports the modulation, line speed, the

error correction protocol, and the DTE speed, respectively. Subsequent responses are disabled.

W2 Upon connection, the modem reports the DCE speed (e.g.,

CONNECT 14400). Subsequent responses are disabled. Result Codes: OK Otherwise ERROR

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Chapter 1 – AT Commands, S-Registers and Result Codes

Command: X Extended Result Codes

Description: Selects the subset of the result code messages used by the modem to

inform the DTE of the results of commands. Blind dialing is enabled or disabled by country parameters. If the user wishes to enforce dial tone detection, a "W" can be placed in the dial string (see D command). The information below is based upon the default implementation of the X results table.

If the modem is in facsimile mode (+FCLASS=1, 1.0, or 2), the only

message sent to indicate a connection is CONNECT without a speed

indication. See the table of Result Codes at the end of this chapter. Default: 4 Defined Values: X0 Disables reporting of busy tones unless forced otherwise by country

requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, and NO ANSWER result codes. Blind dialing is enabled/disabled by country parameters. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported. If dial tone detection is enforced or selected and dial tone is not detected, NO CARRIER will be reported instead of NO DIAL TONE. The value 000b is written to S22 bits 6, 5, and 4, respectively.

X1 Disables reporting of busy tones unless forced otherwise by country

requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO ANSWER, and CONNECT XXXX (XXXX = rate). Blind dialing enabled/disabled by country parameters. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported instead of BUSY. If dial tone detection is enforced or selected and dial tone is not detected, NO CARRIER will be reported instead of NO DIAL TONE. The value 100b is written to S22 bits 6, 5, and 4, respectively.

X2 Disables reporting of busy tones unless forced otherwise by country

requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO DIAL TONE, NO ANSWER, and CONNECT XXXX. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported instead of BUSY. If dial tone detection is enforced or selected and dial tone is not detected, NO DIAL TONE will be reported instead of NO CARRIER. The value 01b is written to S22 bits 6, 5, and 4, respectively.

X3 Enables reporting of busy tones; send only OK, CONNECT, RING,

NO CARRIER, ERROR, NO ANSWER, and CONNECT XXXX. Blind dialing is enabled/disabled by country parameters. If dial tone detection is enforced and dial tone is not detected, NO CARRIER will be reported. The value 110b is written to S22 bits 6, 5, and 4, respectively.

X4 Enables reporting of busy tones; send all messages. The value 111b

is written to S22 bits 6, 5, and 4, respectively. Result Codes: OK Otherwise ERROR

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Command: &C RLSD (DCD) Option

Description: The modem controls the RLSD output in accordance with the parameter

supplied. The parameter value, if valid, is written to S21 bit 5. Default: 1 Defined Values: &C0 RLSD remains ON at all times. &C1 RLSD follows the state of the carrier. Result Codes: OK Otherwise ERROR

Command: &D DTR (Data Terminal Ready) Option

Description: Interprets the ON to OFF transition of the DTR signal from the DTE in

accordance with the parameter supplied. The parameter value, if valid, is

written to S21 bits 3 and 4. Also, see S25. Default: 2 Defined Values: &D0 DTR drop is interpreted according to the current &Q setting as

follows:

&Q0, &Q5, &Q6: DTR is ignored (assumed ON). Allows operation

with DTEs, which do not provide DTR.

Q1 DTR drop causes the modem to hang up. Auto-answer is not

affected.

&Q2, &Q3 DTR drop causes the modem to hang up. Auto-answer is

inhibited.

&D1 DTR drop is interpreted according to the current &Q setting as

follows:

&Q0, &Q1, &Q5, &Q6 DTR drop is interpreted by the modem as if

the asynchronous escape sequence had been entered. The modem returns to asynchronous Command State without disconnecting.

&Q2, &Q3 DTR causes the modem to hang up Auto-answer is

inhibited.

&D2 DTR drop is interpreted according to the current &Q setting as

follows:

&Q0 through &Q6 drop caused the modem to hang up. Auto-answer

is inhibited.

&D3 DTR drop is interpreted according to the current &Q setting as

follows:

&Q0, &Q1, &Q5, &Q6 DTR drop causes the modem to perform a soft

reset as if the Z command were received. The &Y setting determines which profile is loaded.

&Q2, &Q3 DTR drop causes the modem to hang up. Auto-answer is

inhibited.

If &Q5, &Q6, +FCLASS=1 or +FCLASS=2 is in effect, the action

taken is the same as for &Q0.

Command: &K Flow Control

Description: Defines the DTE/DCE (terminal/modem) flow control mechanism. The

parameter value, if valid, is written to S39 bits 0, 1, and 2. Default: 3 (for data modem modes) Defined Values: 0 Disables flow control. 3 Enables RTS/CTS flow control. 4 Enables XON/XOFF flow control. 5 Enables transparent XON/XOFF flow control.

Note: Upon reset, both RTS/CTS and XON/XOFF flow control is enabled

for fax modem and voice modes. Result Codes: OK Otherwise ERROR

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Command: &R RTS/CTS (Request to Send/Clear to Send) Option

Description: This selects how the modem controls CTS. CTS operation is modified if

hardware flow control is selected (see &K command). The parameter

value, if valid, is written to S21 bit 2. Default: None Defined Values: &R0 In sync mode, CTS tracks the state of RTS; the RTS-to-CTS delay is

defined by S26. In async mode, CTS is normally ON and will turn OFF only if required by flow control.

&R1 In sync mode, CTS is always ON (RTS transitions are ignored).

Tracks the state of RTS; In async mode, CTS is normally ON and will

turn OFF only if required by flow control. Result Codes: OK Otherwise ERROR

Command: &S DSR (Data Set Ready) Override

Description: Selects how the modem will control DSR. The parameter value, if valid, is

written to S21 bit 6. Default: 0 Defined Values: &S0 DSR will remain ON at all times. &S1 DSR will become active after answer tone has been detected and

inactive after the carrier has been lost. Result Codes: OK Otherwise ERROR

Command: +IPR Fixed DTE (Data Terminal Equipment) Rate

Description: This numeric extended-format parameter specifies the data rate at which

the modem will accept commands during online operation. It may be used to select operation at rates at which the modem is not capable of automatically detecting the data rate being used by the DTE. Specifying a value of 0 disables the function and allows operation only at rates automatically detectable by the modem. The specified rate takes effect following the issuance of any result code(s) associated with the current command line.

The <rate> specified does not apply in Online Data State if Normal Mode

(Direct Mode) of operation is selected. Default: None Defined Values: <rate> Specifies the DTE-modem interface operation rate in bits/s. The available rates are 0, 300, 1200, 2400, 4800, 9600, 19200, 38400,

57600, 115200, or 230400. If unspecified or set to 0, automatic detection is selected and the character

format is also forced to autodetect, +ICF=0. If the rate specified is not supported by the modem, an ERROR result code

will be returned. Report Commands: +IPR? Reports current rates

+IPR=? Reports current range Example: +IPR:

(0,300,1200,2400,4800,9600,19200,38400,57600,115200, 230400)

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Command: +IFC DTE-Modem Local Flow Control

Description: This extended-format compound parameter controls the operation of local

flow control between the DTE and the modem during the data state when

V.42 error control is used, or when fallback to non-error control mode is

specified to include buffering and flow control. It accepts two numeric subparameters. Default: 2

Defined Values: Values defined by <modem_by_DTE> Specifies the method to be used

by the DTE to control the flow of received data from the modem. +IFC0 None +IFC1 XON/XOFF on transmitted data (XON/XOFF on transmit data);

do not pass XON/XOFF characters to the remote modem. +IFC2 Circuit 133 (Ready for Receiving). +IFC3 DC1/DC3 on circuit 103 (Transmitted Data) with DC1/DC3

characters being passed through to the remote DCE in addition

to being acted upon for local flow control.

Values defined by

by the modem to control the flow of transmitted data from the DTE. +IFC0 None. +IFC1 XON/XOFF on received data. +IFC2 CTS/RTS. Report Commands: +IFC? Reports the current or selected values Response: +IFC: <modem_by_DTE>,<DTE_by_modem> Example: +IFC: 2,2 For the defaults. +IFC=? Reports the supported range of parameter values R esponse: +IFC: (<modem_by_DTE> range),(<DTE_by_modem> range) Example: +IFC: (0-3),(0-2).

<DTE_by_modem> Specifies the method to be used

Command: +ILRR DTE-Modem Local Rate Reporting

Description: This extended-format numeric parameter controls whether or not the

extended-format +ILRR:<rate> information text is transmitted from the

modem to the DTE. Default: 0 Defined Values: +ILRR0 Disables reporting of local port rate (+ILRR: is not transmitted). +ILRR1 Enables reporting of local port rate (+ILRR: is transmitted). Report Commands: +ILRR? Reports current value +ILRR=? Reports supported range of parameter values Reported Rate: The <rate> reported represents the current (negotiated or renegotiated)

DTE-modem rate. If enabled, the intermediate result code is transmitted

after any modulation, error control or data compression reports are

transmitted, and before any final result code (e.g., CONNECT) is

transmitted. The <rate> is applied after the final result code is transmitted. The DTE-modem port rate will change only if neither buffered mode nor

error controlled means are enabled (+ES=x,0) and if the negotiated carrier

rate (+MRR) does not match the current DTE-modem port rate

(autodetected from the previous command line).

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Call Control Commands

Command: D Dial

Description: Directs the modem to go on-line, dial according to the string entered and

attempt to establish a connection. If no dial string is supplied, the modem

will go on-line and attempt the handshake in originate mode.

Note: If the ATD command is issued before the S1 register has cleared,

the modem will respond with the NO CARRIER result code. If +FCLASS=0 is selected, the modem will behave as a data modem and

will attempt to connect to another data modem. The modem will have up to

the period of time specified by register S6 or S7 to wait for carrier and

complete the handshake. If this time expires before the modem can

complete the handshake, the modem will go on-hook with the NO

CARRIER response. This command will be aborted in progress upon

receipt of any DTE character before completion of the handshake. If +FCLASS=1, 1.0, or 2 is selected, the modem will behave as a facsimile

modem and attempt to connect to a facsimile machine (or modem) by

entering the HDLC V.21 channel 2 receive state (as if +FRH=3 had been

issued). This command will be aborted upon receipt of any DTE character

if the modem has not finished dialing. In this case, the modem will go on-

hook and return to command mode after displaying the NO CARRIER

message. If the modem has finished dialing, it proceeds as if the +FRH=3

command has been issued. (Refer to the +FRH command to determine

how the modem behaves following this stage.)

Dial Modifiers

The valid dial string parameters are described below. Punctuation

characters may be used for clarity, with parentheses, hyphen, and spaces

being ignored. Defined Values: Character string <string> corresponding to the selected option(s). 0-9 DTMF digits 0 to 9. * The 'star' digit (tone dialing only). # The 'gate' digit (tone dialing only).

A-D DTMF digits A, B, C, and D. Some countries may prohibit sending of

these digits during dialing.

L Re-dial last number: the modem will re-dial the last valid telephone

number. The L must be immediately after the D with all the following

characters ignored).

P Select pulse dialing: Pulse Dialing is used in the dialed numbers that

follow until a T command is encountered. Affects current and

subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.

T Select tone dialing: Tone Dialing is used in the dialed numbers that

follow until a P is encountered. Affects current and subsequent

dialing. Some countries prevent changing dialing modes after the

first digit is dialed. R This command will be accepted, but not acted on. S=n Dial the number stored in the directory (n = 0 to 3). (See &Z.) ! Flash: the modem will go on-hook for a time defined by the value of

S29. Country requirements may limit the time imposed. W Wait for dial tone: the modem will wait for dial tone before dialing the

digits following "W". If dial tone is not detected within the time

specified by S7 (US) or S6 (W-class), the modem will abort the rest

of the sequence, return on-hook, and generate an error message. @ Wait for silence: the modem will wait for at least 5 seconds of silence

in the call progress frequency band before continuing with the next

dial string parameter. If the modem does not detect these 5 seconds

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of silence before the expiration of the call abort timer (S7), the

modem will terminate the call attempt with a NO ANSWER message.

If busy detection is enabled, the modem may terminate the call with

the BUSY result code. If answer tone arrives during execution of this

parameter, the modem handshakes. & Wait for credit card dialing tone before continuing with the dial string.

If the tone is not detected within the time specified by S7 (US

models) or S6 (W-class models), the modem will abort the rest of the

sequence, return on-hook, and generate an error message. , Dial pause: the modem will pause for a time specified by S8 before

dialing the digits following ",". ; Return to command state. Added to the end of a dial string, this

causes the modem to return to the command state after it processes

the portion of the dial string preceding the ";". This allows the user to

issue additional AT commands while remaining off-hook. The

additional AT commands may be placed in the original command line

following the ";" and/or may be entered on subsequent command

lines. The modem will enter call progress only after an additional dial

command is issued without the ";" terminator. Use "H" to abort the

dial in progress, and go back on-hook. ^ Toggles calling tone enable/disable: applicable to current dial

attempt only. ( ) Ignored: may be used to format the dial string.

- Ignored: may be used to format the dial string. <space> Ignored: may be used to format the dial string. <i> Invalid character: will be ignored. > If enabled by country specific parameter, the modem will generate a

grounding pulse on the EARTH relay output.

Command: T Set Tone Dial Default

Description: Forces DTMF dialing until the next P dial modifier or P command is

received. The modem will set an S-Parameter bit to indicate that all subsequent dialing should be conducted in tone mode. The DP command

will override this command. Clears S14 bit 5. This command may not be permitted in some countries. (See P.) Result Code: OK

Command: P Set Pulse Dial Default

Description: Forces pulse dialing until the next T dial modifier or T command is

received. Sets S14 bit 5. As soon as a dial command is executed which explicitly specifies the

dialing mode for that particular call (e.g., ATDT...), this command is

overridden so that all future dialing will be tone dialed. (See T command.) This command may not be permitted in some countries. Result Code: OK

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Command: A Answer

Description: The modem will go off-hook and attempt to answer an incoming call if

correct conditions are met. Upon successful completion of answer

handshake, the modem will go on-line in answer mode. This command

may be affected by the state of Line Current Sense, if enabled. (Most

countries do not require Line Current Sense.) Operation is also dependent

upon +FCLASS command and country-specific requirements. If +FCLASS=0 is selected, the modem will enter the Connect state after

exchanging carrier with the remote modem. If no carrier is detected within

a period specified in register S7, the modem hangs up. Any character

entered during the connect sequence will abort the connection attempt. If +FCLASS=1, 1.0, or 2 is selected, the modem will go off-hook in V.21

answer mode. It will generate the V.21 2100 Hz answer tone for 3 ± 0.5

seconds and, following a delay of 70 ms, will proceed as if the +FTH=3

command were issued. At any stage up to (but excluding) the +FTH=3

command state, any character will abort the communication. (See the

description of the +FTH command for details.)

Command: H Disconnect (Hang-Up)

Description: Initiates a hang up sequence. This command may not be available for

some countries due to PTT restrictions. Default: None Defined Values: H0 The modem will release the line if the modem is currently on-line,

and will terminate any test (AT&T) that is in progress. Country specific, modulation specific, and error correction protocol specific (S38) processing is handled outside of the H0 command.

H1 If on-hook, the modem will go off-hook and enter command mode.

For US models, the modem will remain off-hook. For global models, the modem will return on-hook after a period of time determined by

S7. Result Codes: OK Otherwise ERROR

Command: O Return to Online Data Mode

Description: Determines how the modem will enter the online data mode. If in the online

command mode, the modem enters the online data mode with or without a retrain. If in the off-line command mode (no connection), the modem

reports ERROR. Default: None Defined Values: O0 Enters on-line data mode without a retrain. Handling is determined by the Call Establishment task. Generally, if

a connection exists, this command connects the DTE back to the remote modem after an escape (+++).

O1 Enters on-line data mode with a retrain before returning to on-line

data mode.

O2 Fast retrain without speed change (used for diagnostic purpose

only).

O3 Renegotiate rate without speed change (used for diagnostic purpose

only.

O4 Renegotiate rate down one speed (used for diagnostic purpose

only). O5 Renegotiate rate up one speed (used for diagnostic purpose only). Result Codes: OK Otherwise ERROR (or if not connected)

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Command: L Speaker Volume

Description: Sets the speaker volume control. The parameter value, if valid, is written to

S22 bits 0 and 1. Default: 1 Defined Values: L0 Low volume. L1 Low volume. (Default.) L2 Medium volume. L3 High volume. Result Codes: OK Otherwise ERROR

Command: M Speaker Control

Description: Selects when the speaker will be on or off. The parameter value, if valid, is

written to S22 bits 2 and 3. Default: 1 Defined Values: M0 Speaker is always off. M1 Speaker is on during call establishment, but off when receiving

carrier. (Default.) M2 Speaker is always on. M3 Speaker is off when receiving carrier and during dialing, but on

during answering. Result Codes: OK Otherwise ERROR

Command: &G Select Guard Tone

Description: Causes the modem to generate the guard tone selected by this command

(DPSK modulation modes only). The parameter value, if valid, is written to

S23 bits 6 and 7. This command may not be permitted in some countries. Default: 0 Defined Values: &G0 Disables guard tone. (Default.) &G1 Disables guard tone. &G2 Selects 1800 Hz guard tone. Result Codes: <value> = 0 to 2 Otherwise ERROR

Command: &P Select Pulse Dial Make/Break Ratio

Description: Determines the make/break ratio used during pulse dialing. The default is

country-dependent. The parameter value, if valid, is written to S28 bits 3

and 4. Default: 0 Defined Values: &P0 Selects 39%-61% make/break ratio at 10 pulses per second. &P1 Selects 33%-67% make/break ratio at 10 pulses per second. &P2 Selects 39%-61% make/break ratio at 20 pulses per second. &P3 Selects 33%-67% make/break ratio at 20 pulses per second. Result Codes: OK Otherwise ERROR

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Command: &V Display Current Configuration and Stored Profiles

Description: Reports the current (active) configuration, the stored (user) profiles, and

the first four stored telephone numbers. The stored profiles and telephone

numbers are not displayed if the NVRAM is not installed or is not

operational as detected by the NVRAM test during reset processing. Result Code: OK Example: AT&V ACTIVE PROFILE: B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0 S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S38:020 S46:138 S48:007 S95:000

STORED PROFILE 0: B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0 S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007 S40:104 S41:195 S46:138 S95:000

STORED PROFILE 1: B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0 S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007 S40:168 S41:195 S46:138 S95:000

TELEPHONE NUMBERS: 0 = 1 = 2 = 3 = OK.

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Command: &V1 Display Last Connection Statistics

Description: Displays the last connection statistics in the following format (shown with

typical results): TERMINATION REASON LOCAL REQUEST LAST TX rate 26400 BPS HIGHEST TX rate 26400 BPS LAST RX rate. 49333 BPS HIGHEST RX rate 49333 BPS PROTOCOL LAPM COMPRESSION V42Bis Line QUALITY 038 Rx LEVEL 015 Highest Rx State 67 Highest TX State 67 EQM Sum 00B4 Min Distance 0000 RBS Pattern 00

Rate Drop 00

Digital Loss 2000

Local Rtrn Count 00

Remote Rtrn Count 00

Flex 9481814347C4

RBS Pattern: Shows which bits are being robbed in the least significant 6

bytes, e.g., 03 indicates 2 robbed bits in bit positions 0 and 1.

Digital Loss: Shows if a pad was encountered and if so, what was the digital

loss. 2000 means 0dB.

Flex: Shows V.8bis information as follows:

First byte: Octet 13 (second byte of manufacturer id, 94 = 56K) Second byte: Octet 14 (Licensee code: 81 = Conexant) Third byte: Octet 15 (manufacturer's product capabilities) Fourth byte: Octet 16 (56K version number)

Fifth byte: Octet 17 (Conexant pump code version number) Sixth byte: Octet 18 (x-law and controller version number)

Bit 6 Forced/Not forced A-Law/µ-Law

0 = Forced A-Law/µ-Law. 1 = Not forced A-Law/µ-Law.

Bit 5 Select A-Law or µ-Law

0 = Select A-Law. 1 = Select µ-Law.

Bit 4:0 Controller version

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Command: \V Single Line Connect Message Enable

Description: Enables or disables the single-line connect message format as follows: Default: None Defined Values:

When single line connect messages are enabled, there are no CARRIER,

The single line connect message format is: CONNECT <DTE

Where:

\V0 Connect messages are controlled by the command settings X, W,

and S95.

\V1 Connect messages are displayed in the single line format described

below subject to the command settings V (Verbose) and Q (Quiet). In Non-Verbose mode (V0), single line connect messages are disabled and a single numeric result code is generated for CONNECT DTE.

PROTOCOL (+ER:), or COMPRESSION (+DR:) messages apart from the

fields described below.

Speed>/<Modulation>/<Protocol>/<Compression>/<Line Speed>

DTE Speed = DTE speed, e.g., 57600.

Modulation = “V92” for V.92 modulation.

“V90” for V.90 modulation.

“K56” for 56K modulation.

“V34” for V.34 modulation.

“V32” for V.32 or V.32bis modulation.

Note: Modulation is omitted for all other modulations.

Protocol = “NONE” for no protocol.

“ALT” for Microcom Network Protocol.

“LAPM” for LAP-M protocol.

Compression = “V44” for V.44 compression.

“V42B” for V.42bis compression.

“ALT” for Microcom MNP5 compression.

Note: Compression is omitted if protocol is NONE.

Line Speed = Asymmetric rates are displayed as “/rate:TX/rate:RX”,

e.g., /1200 TX/75 RX.

Symmetric rates are displayed as a single DCE rate,

e.g., 14400.

Command: %L Report Line Signal Level

Description: Returns a value, which indicates the received signal level. The value

returned is a direct indication (DAA dependent) of the receive level at the

MDP, not at the telephone line connector. For example, 009 = -9 dBm, 043

= -43 dBm, and so on. Result Codes: OK

Command: %Q Report Line Signal Quality

Description: Reports the line signal quality (DAA dependent). Returns the higher order

byte of the EQM value. Based on the EQM value, retrain or fallback/fall

forward may be initiated if enabled by %E1 or %E2. Example: AT%Q 015 Result Codes: OK If connected. ERROR If not connected, or connected in 300 bps, V.23, or fax modes.

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Command: –STE= Set Telephony Extension

Description: Enables/disables Line-In-Use, Extension Pickup, and Remote Hangup

detection features.

Note: Additional hardware may be required to support these features.

Defined Values: The <value> corresponds to the selected bit-mapped options. The bit fields

are defined as follows:

Bit 0 Line-In-Use detection enable/disable.

Bit 1 Extension Pickup detection enable/disable.

Bit 2 Remote Hangup detection enable/disable.

<value> (Dec.)

Remote Hangup

Extension Pickup

Line-in-Use

0 (default) Disabled Disabled Disabled

1 Disabled Disabled Enabled 2 Disabled Enabled Disabled 3 Disabled Enabled Enabled 4 Enabled Disabled Disabled 5 Enabled Disabled Enabled 6 Enabled Enabled Disabled 7 Enabled Enabled Enabled

Report Commands: -STE? Reports current values Example: -STE: 4 Remote Hangup enabled, Extension Pickup disabled, and Line-In-Use disabled.

-STE=? Reports available options

Behavior in Data Mode (+FCLASS=0):

When on-hook, if the line is in use and an ATDT is issued, the modem will

not go off-hook and will return with the message LINE-IN-USE. When off-hook and either an extension is picked up or a line reversal is

detected, the modem will drop the connection. The disconnect reason in

hook in order to get a dial tone due because the remote server will be

retraining. If the local handset is picked up while the modem is off-hook, the modem

will do a link-disconnect, flash the hook for 1.5 seconds, and then connect

the local handset to the line. At this point, the user dial tone should be on

the local handset. The disconnect reason in S86=25.

Behavior in Voice Mode (+FCLASS=8):

When in voice mode and an extension is picked-up, a <DLE>P is sent to

In voice mode, there is no blocking of ATDT when the line is in use. Also,

Operation in Data Mode: Line-In-Use

(Enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7) Case 1: Telephone Line is in Use

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is

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the DTE. When the modem is off-hook, a line reversal may also be

detected in which case a <DLE>l is sent to the DTE.

there is no automatic hang-up in voice mode as in data mode. There is

only the above stated <DLE> shielding event reporting.

enabled and the telephone line is in use, the modem will immediately return the message LINE-IN-USE to the DTE without going off-hook, and then return to command mode.

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Case 2: Telephone Line is in Use but Disconnected

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is

enabled and the telephone line is NOT in use, the modem will go offhook after a short pause, then respond with CONNECT or NO CARRIER message.

Case 3: Telephone Line is not Connected to Modem

If an ATDT, ATDP, or ATDL is issued while Line-In-Use detection is

enabled and the telephone line is not connected, the modem will go offhook momentarily, go back on-hook, and then respond with NO DIAL TONE message.

Extension Pick-up

(Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7):

Case 1: Modem off-hook, Local Handset Goes Off-Hook

If the local handset goes off-hook while the modem is in a data

connection, the local handset will be muted. The modem will then send a GSTN Cleardown to the remote modem and then go on-hook. The modem will then send a NO CARRIER message to the DTE. A result code of 25 will be left in S86 register. After 2 seconds, the local handset will be connected to the telephone line so the user hears the dial tone.

Remote Hang-up (Enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7):

Case 1: Modem off-hook, Remote Hang-up

If the modem is connected (off-hook) and the remote modem/server

goes hangs up, the central office may issue a line polarity reversal. If a line polarity reversal is detected, the modem will drop the call and respond with NO CARRIER. The reason for hang-up can be determined by #UD or by S86=25. A line reversal can also be simulated by simply pulling out the telephone line during a connection.

Operation in Voice Mode Line-In-Use

(Enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7):

This feature does not apply in voice mode.

Extension Pickup

(Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7)

If the modem is off-hook and an extension goes off-hook, the modem

Remo te Ha ng-u p (Enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7) If the modem is off-hook and the remote user goes on-hook, the modem

Examples:

User is talking on an extension and the modem tries to dial AT-STE=7 ATDT555-1212 LINE-IN-USE.

The line is not in use and the modem tries to dial AT-STE=7 ATDT555-1212 Modem goes off-hook CONNECT

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issues a <DLE>P to the DTE. The application software should then hang

up the line (VLS=0).

issues a <DLE>P to the DTE. The application software should then hang

up the line (VLS=0).

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An extension is off-hook but there is silence on the line and the modem

tries to dial

AT-STE=3 ATDT555-1212 Modem goes off-hook NO DIAL TONE

Modem is connected in data mode and remote modem goes on-hook

AT-STE=4

ATDT555-1212

CONNECT

NO CARRIER Remote modem drops line

ATS86=?

025

Modem is in answer machine mode and an extension goes off-hook

AT-STE=2

AT+FCLASS=8

<DLE>h Local handset on-hook

<DLE>R Ring

AT+VLS=1

AT+VSM=1,7200,0,0

AT+VTX Starts to play greeting message

<DLE>P User picks up extension

<DLE>! DTE send abort to end playback

AT+VLS=0 DTE hangs up.

Automated system that needs to periodically use the line while giving the

voice user the highest priority

A common use for these features would be an automated system that

needs to periodically use the line while giving the voice user the highest

priority. The automated system would make a connection when the line is

free. It would do this without disturbing the line if the line is in use. The

automated system would periodically retry the connection until the line is

free. Once the line is free it would dial and make its connection. If a voice

user wishes to use the line while the modem is connected. The modem will

drop the line and give the line to the user. The modem will then try to

regain control of the line by once again periodically retrying to establish a

connection.

AT-STE=7

ATDT5551212

CONNECT

Sometime later, the user picks up phone

NO CARRIER

ATS86?

Delay 30 seconds

ATDT5551212

LINE-IN-USE

Try again some time later; user hangs up phone

CONNECT

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Modulation Control Commands

Command: +MS Modulation Selection

Description: This extended-format compound parameter controls the manner of

operation of the modulation capabilities in the modem. It accepts six

subparameters. Syntax: +MS=[<carrier>[,<automode>[,<min_tx_rate>[,<max_tx_rate> [,<min_rx_rate> [,<max_rx_rate>]]]]]] Where possible <carrier>, <min_tx_rate>, <max_tx_rate>, <min_rx_rate>,

and <max_rx_rate> values are listed in Table 1-3.

Table 1-3. +MS Command Supported Rates

Modulation <carrier> Possible (<min_rx_rate>, <min_rx_rate>, (<min_tx_rate>),

Bell 103 B103 300 Bell 212 B212 1200 Rx/75 Tx or 75 Rx/1200 Tx V.21 V21 300 V.22 V22 1200 V.22 bis V22B 2400 or 1200 V.23 V23C 1200 V.32 V32 9600 or 4800 V.32 bis V32B 14400, 12000, 9600, 7200, or 4800 V.34 V34 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,

56K K56 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000,

V.90 V90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,

V.92 downstream

V.92 upstream

Note: Some <carrier> values may not be supported by certain model models. For

example, modem models supporting V92 may not support K56.

V92 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,

V92 48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,

and <max_tx_rate>) Rates (bps)

14400, 12000, 9600, 7200, 4800, or 2400

40000, 38000, 36000, 34000, 32000

45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000

37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000, 26667, 25333, 24000

Defined Values: <carrier> A string that specifies the preferred modem carrier to

use in originating or answering a connection. <carrier> values are strings of up to eight characters, consisting only of numeric digits and upper case letters. <carrier> values for ITU standard modulations take the form: <letter><1-4 digits><other letters as needed>. Defined values are listed in Table 1-3.

<automode> A numeric value which enables or disables automatic

modulation negotiation (ITU-T V.32bis Annex A or V.8).

0 = Automode disabled.

1 = Automode enabled. (Default.)

<min_rx_rate> and <max_rx_rate>

Numeric values which specify the lowest (<min_rx_rate>) and highest (<max_rx_rate>) rate at which the modem may establish a receive connection. May be used to condition distinct limits for the receive direction as distinct from the transmit direction. Values for this subparameter are decimal encoded, in units of bit/s. The possible values for each modulation are listed in Table 1-3. Actual values will be limited to possible values corresponding to the entered <carrier> and fallback <carrier> as determined during operation. (Default

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= lowest (<min_rx_rate>) and highest (<max_rx_rate>) rate supported by the selected carrier.)

<min_tx_rate> and <max_tx_rate>

Numeric values which specify the lowest (<min_tx_rate>) and highest (<max_tx_rate>) rate at which the modem may establish a transmit connection. Non-zero values for this subparameter are decimal encoded, in units of bit/s. The possible values for each modulation are listed in Table 1-3. Actual values will be limited to possible values corresponding to the entered <carrier> and fall-back <carrier> as determined during operation. (Default = lowest (<min_tx_rate>) and highest (<max_tx_rate>) rate supported by the selected carrier.).

Report Commands: +MS? Reports current rates

Response: +MS:<carrier>,<automode>,<min_tx_rate>, <max_tx_rate>, <min_rx_rate>,<max_rx_rate>

Note: The current active settings are reported under control of

the +MR parameter. Example: +MS: K56, 1,300,33600,300,56000 For default values. This example allows maximum system

flexibility to determine optimal receive and transmit rates during operation.

+MS=? Reports supported range of parameter values:

Response: +MS: (< carrier> range),(<automode> range),(<min_tx_rate> range), (<max_tx_rate> range), (<min_rx_rate> range), (<max_rx_rate> range)

Example 1: +MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34, K56,V90),(0,1),(300-33600),(300-33600),(300-56000),(300-

56000) Example 2:

+MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34, V90,V92),(0,1),(300-33600),(300-33600),(300-56000),(300-

56000)

Result Code: OK - Valid subparameter string Otherwise ERROR

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Command: +MR Modulation Reporting Control

Description: This extended-format numeric parameter controls whether or not the

extended-format +MCR:<carrier> and +MRR:<rate> intermediate result

codes are transmitted from the modem to the DTE. If enabled,

+MCR:<carrier> and +MRR:<rate> intermediate result codes represent the

current (negotiated or renegotiated) modulation <carrier> and <rate> that

are transmitted at the point during connect negotiation (handshaking) at

which the modem has determined which modulation and rate will be used,

i.e., before any Error Control or Data Compression reports are transmitted,

and before any final result code (e.g., CONNECT) is transmitted. S95 bit 2 is reset to 0 for +MR=0 and is set to a 1 for +MR=1 or +MR=2.

The more recent setting of +MR or S95 bit 2, and the W command setting,

determines modulation result code reporting (see S95 Parameter and W

Command). Default: 0 Defined Values: +MR0 Disables reporting of modulation connection (+MCR: and +MRR:

are not transmitted).

+MR1 Enables reporting of modulation connection (+MCR: and +MRR:

are transmitted with TX rate, RX rate).

+MR2 Enables reporting of modulation connection (+MCR: and +MRR:

are transmitted with RX rate only). Report Commands: +MR? Reports the current value. +MR=? Reports supported range of parameter values.

+MCR Report Syntax

Response: +MCR: <carrier>

<carrier> Alphanumeric code corresponding to the reported

carrier. Defined values are:

B103 For Bell 103 B212 For Bell 212 V21 For V.21 V22 For V.22 V22B For V.22bis V23C For V.23 V32 For V.32 V32B For V.32bis V34 For V.34 V90 For V.90 K56 For K56flex

+MRR Report Syntax

Response: +MRR: <tx_rate>,<rx_rate>

<tx_rate> Decimal transmit rate in bits/s. <rx_rate> Decimal receive rate in bits/s. Example: +MRR: 28800, 48000

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Command: %E Enable/Disable Line Quality Monitor and Auto-Retrain or

Fallback/Fall Forward

Description: Controls whether or not the modem will automatically monitor the line

quality and request a retrain (%E1) or fall back when line quality is insufficient or fall forward when line quality is sufficient (%E2). The parameter value, if valid, is written to S41 bits 2 and 6.

If enabled, the modem attempts to retrain for a maximum of 30 seconds.

Fallback/Fall Forward. When %E2 is active, the modem monitors the line

quality (EQM). When line quality is insufficient, the modem will initiate a rate renegotiation to a lower speed within the V.34/V.32 bis/V.32 (RC336) modulation speeds. The modem will keep falling back within the current modulation if necessary until the speed reaches 2400 bps (V.34) or 4800 bps (V.32). Below this rate, the modem will only do retrains if EQM thresholds are exceeded. If the EQM is sufficient for at least one minute, the modem will initiate a rate renegotiation to a higher speed within the current modulation speeds. The rate renegotiations will be done without a retrain if a V.32bis connection is established.

Speeds attempted during fallback/fall forward are those shown to be available in the rate sequences exchanged during the initial connection. Fallback/fall forward is available in error correction and normal modes, but

not in direct mode or synchronous mode with external clocks. Default: 2 Defined Values: %E0 Disable line quality monitor and auto-retrain. %E1 Enable line quality monitor and auto-retrain. %E2 Enable line quality monitor and fallback/fall forward. (Default.) Result Codes: OK Otherwise ERROR

Command: %U Select µ-Law or A-Law Codec Type

Description: Selects µ-Law or A-Law codec type for V.90 and 56K modulation. This command also stores the selected setting directly to NVRAM. Default: Default value is country specific Defined Values: 0 Selects µ-Law. 1 Selects A-Law. Result Codes: OK Otherwise ERROR

Command: B Communication Standard Setting – CCITT or Bell

Description: When the modem is configured to allow either option, the modem will

select Bell or CCITT modulation for a line speed connection of 300 or 1200

bps. Any other line speed will use a CCITT modulation standard. The

parameter value, if valid, is written to S27 bit 6. Default: B0 (default for MT5600SMI) B1 (default for MT5656SMI) Defined Values: B0 Selects CCITT operation at 300 or 1200 bps during Call

Establishment and a subsequent connection. (Default.)

B1 Selects BELL operation at 300 or 1200 bps during Call

Establishment and a subsequent connection. Result Codes: OK Otherwise ERROR

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Error Control Commands

Command: +ES Error Control and Synchronous Mode Selection

Description: This extended-format command specifies the initial requested mode of

operation when the modem is operating as the originator. Optionally specifies the acceptable fallback mode of operation when the modem is operating as the originator; optionally specifies the acceptable fallback mode of operation when the modem is operating as the answerer. Accepts three numeric subparameters.

Default: Varies by request

Defined Values: <orig_rqst>

Decimal number specifies the initial requested mode of operation when the modem is operating as the originator. The options are: +ES0 Initiate call with Direct Mode. +ES1 Initiate call with Normal Mode (referred to as Buffered Mode) only. +ES2 Initiate V.42 without Detection Phase. If V.8 is in use, disable V.42

Detection Phase.

+ES3 Initiate V.42 with Detection Phase. (Default.)

+ES4 Initiate MNP. +ES6 Initiate V.80 Synchronous Access Mode when connection is

completed and Data State is entered. (See +ESA and +ITF.)

+ES7 Initiate Frame Tunneling Mode when connection is complete and

Data Mode is entered.

<orig_fbk>

Decimal number specifies the acceptable fallback mode of operation when

the modem is operating as the originator.

+ES0 LAPM, MNP, or Normal Mode error control optional. (Default.)

+ES1 LAPM, MNP, or Direct Mode error control optional. +ES2 LAPM or MNP error control required; disconnect if error control is

not established.

+ES3 LAPM error control required; disconnect if error control is not

established.

+ES4 MNP error control required; disconnect if error control is not

established.

<ans_fbk>

Decimal number specifies the acceptable fallback mode of operation when the modem is operating as the answerer or specifies V.80 Synchronous Access Mode. +ES0 Direct Mode. +ES1 Error control disabled, use Normal Mode. +ES2 LAPM, MNP, or Normal Mode error control optional. (Default.) +ES3 LAPM, MNP, or Direct Mode error control optional. +ES4 LAPM or MNP error control required; disconnect if error control is

not established.

+ES5 LAPM error control required; disconnect if error control is not

established.

+ES6 MNP error control required; disconnect if error control is not

established.

+ES8 Initiate V.80 Synchronous Access Mode when connection is

completed and Data State is entered (see +ESA and +ITF).

+ES9 Initiate Frame Tunneling Mode when connection is complete and

Data Mode is entered. Examples: +ES=6 Enable V.80 Synchronous Access Mode originator. +ES=6 Enable V.80 Synchronous Access Mode originator. +ES=,,8 Enable V.80 Synchronous Access Mode answerer. +ES=6,,8 Enable V.80 Synchronous Access Mode.

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+ES=3 Enable V.42 with Detection Phase originator. Disable V.80

Synchronous Access Mode originator.

+ES=,,2 Allow LAPM, MNP, or Normal Mode connection answerer.

Disable V.80 Synchronous Access Mode answerer.

+ES=3,,2 Enable V.42 with Detection Phase originator, allow LAPM,

MNP, or Normal Mode connection answer. Disable

Synchronous Access Mode originator and answerer. Report Commands: +ES? Reports the current values Response: +ES: <orig_rqst>,<orig_fbk>,<ans_fbk> Example: +ES: 3,0,2 For the default setting. +ES=? Reports supported range of parameter values Response: +ES: (<orig_rqst> range),( <orig_fbk> range),

(<ans_fbk> range) Example: +ES: (0-4,6,7),(0-4),(0-6,8,9)

Command: +EB Break Handling in Error Control Operation

Description: This extended-format compound parameter controls the break handling in

V.42 operation. It accepts three numeric subparameters: Default: None Defined Values: <break_selection> Decimal number 0 specifying that break is to be

ignored, i.e., not signaled to remote DCE.

<timed> Decimal number 0 specifying that any transmitted

V.42 L-SIGNAL will not indicate break signal length

<default_length> Decimal number 0 specifying that break is not

delivered to the DTE. Report Commands: +EB? Reports current or selected values Response: +EB:

<break_selection>,<timed>,<default_length><CR> Example: +EB: 0,0,0 For default settings. +EB=? Reports supported range of parameter values Response: +EB: (<break_selection> range),(<timed> range),

(default_length> range) Example: +EB: (0),(0),(0)

Command: +ESR Selective Reject

Description: This extended-format numeric parameter controls the use of the selective

reject (SREJ) option in V.42. Decimal number 0 specifying that SREJ is not used. Report Commands: +ESR? Reports Current or Selected Values: Response: +ESR: <value> Example: +ESR: 0 For default setting +ESR=? Reports Supported Range of Parameter Values Response: +ESR: (<value>) Example: +ESR: (0)

Command: +EFCS 32-bit Frame Check Sequence

Description: This extended-format numeric parameter controls the use of the 16-bit or

32-bit frame check sequence (FCS) option in V.42. Defined Values: <value> Decimal number 0 specifying the use of the 16-bit FCS specified

in V.42. Report Commands: +EFCS? Current or Selected Values: Response: +EFCS: <value> Example: +EFCS: 0 For default setting. +EFCS=? Reporting Supported Range of Parameter Values Response: +EFCS: (<value> range) Example: +EFCS: (0)

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Command: +ER Error Control Reporting

Description: This extended-format numeric parameter controls whether or not the

intermediate result code is transmitted from the modem to the DTE.

S95 bit 3 is reset to 0 for +ER=0 and is set to a 1 for +ER=1. The more

recent setting of +ER or S95 bit 3, and the W command setting, determines

the actual error control result code reporting (see S95 Parameter and W). Default: 0 Defined Values: +ER0 Error control reporting disabled (no +ER intermediate result

code transmitted).

+ER1 Error control reporting enabled (+ER intermediate result code

transmitted). Report Commands: +ER? Reports Current or Selected Values Response: +ER: <current value> Example: +ER: 0 for the default setting +ER=? Reporting Supported Range of Parameter Values. Response: +ER: (<value> range) Example: +ER: (0,1)

Command: +ER: <type> Report the Current Error Control

Description: The +ER: <type> reported represents the current (negotiated or

renegotiated) modem-modem error control type. If enabled, the intermediate result code is transmitted during error control negotiation (handshaking) at which time the modem has determined the error control protocol will be used (if any), before the final result code (e.g., CONNECT) is transmitted. The +ER intermediate result code, if enabled, is issued after the Modulation report (+MCR and +MRR) and before the

Data Compression Report (+DR). Defined Values: NONE Error control is not in use. LAPM V.42 LAPM protocol is in use. ALT MNP is in use. Example: +ER: LAPM

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Command: +ETBM Call Termination Buffer Management

Description: This extended-format compound parameter controls the handling of data

remaining in modem buffers upon call termination. It accepts three numeric

subparameters: Default: None Defined Values: <pending_TD> Decimal number 0 specifies disconnect will occur

immediately and all buffered transmit data will be discarded when the local DTE requests call disconnection.

<pending_RD> Decimal number 0 specifying that disconnect will occur

immediately and all buffered receive data will be discarded when the local DTE requests call disconnection.

<timer> Decimal number 0 specifying that the modem will not

attempt to deliver the buffered data before abandoning the attempt and discarding remaining data.

Report Commands: +ETBM? Reports Current or Selected Values.

Response:

+ETBM: <pending_TD>,<pending_RD>,<timer> Example: +ETBM: 0,0,0 +ETBM=? Reports Supported Range of Parameter Values.

Response: +ETBM: (<pending_TD> range),(<pending_RD> range), (<timer> range)

Example: +ETBM: (0),(0),(0)

Command: \B Transmit Break to Remote

Description: In non-error correction mode, the modem will transmit a break signal to the

remote modem with a length in multiples of 100 ms according to parameter specified. If a number in excess of 9 is entered, 9 is used. The command works in conjunction with the \K command.

In error correction mode, the modem will signal a break through the active

error correction protocol, giving no indication of the length. Defined Values: 1-9 Break length in 100 ms units. (Default = 3.) (Non-error corrected mode only.) Result Codes: OK if connected in data modem mode. NO CARRIER if not connected or connected in fax modem mode.

Note: When the modem receives a break from the remote modem, break

is passed to the DTE as follows: In non-error correction mode direct, the

break length is passed; in non-error correction mode normal and in error

correction mode, a 300 ms break is passed.

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Command: \K Break Control

Description: Controls the response of the modem to a break received from the DTE or

the remote modem or the \B command. The parameter value, if valid, is

written to S40 bits 3, 4, and 5. Defined Values: The response is different in three separate states.

The first state is where the modem receives a break from the DTE

when the modem is operating in data transfer mode:

\K0 Enter on-line command mode, no break sent to the remote modem. \K1 Clear data buffers and send break to remote modem. \K2 Same as 0. \K3 Send break to remote modem immediately. \K4 Same as 0. \K5 Send break to remote modem in sequence with transmitted data.

(Default.)

The second case is where the modem is in the online Command State

(waiting for AT commands) during a data connection, and the \B is

received in order to send a break to the remote modem:

\K0 Clear data buffers and send break to remote modem. \K1 Same as 0. \K2 Send break to remote modem immediately. \K3 Same as 2. \K4 Send break to remote modem in sequence with data. \K5 Same as 4. (Default.)

The third case is where a break is received from a remote modem

during a non-error-corrected connection:

\K0 Clears data buffers and sends break to the DTE. \K1 Same as 0. \K2 Send a break immediately to DTE. \K3 Same as 2. \K4 Send a break in sequence with received data to DTE. \K5 Same as 4. (Default.) Result Codes: OK Otherwise ERROR

Command: -K MNP Extended Services

Description: Enables or disables conversion of a V.42 LAPM connection to an MNP 10

connection. The parameter value, if valid, is written to S40 bits 0 and 1. Defined Values: -K0 Disables V.42 LAPM to MNP 10 conversion. (Default.)

-K1 Enables V.42 LAPM to MNP 10 conversion.

-K2 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended

Services initiation during V.42 LAPM answer mode detection phase. Result Codes: OK ERROR

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Data Compression Commands

This section contains parameters to condition modem use of standard ITU-T V.42bis Data Compression

Procedures.

Command: +DS Data Compression

Description: This extended-format compound parameter controls the V.42bis data

compression function if provided in the modem. It accepts four numeric subparameters:

Defined Values: <direction> Specifies the desired direction(s) of operation of the data

compression function; from the DTE point of view. +DS0 Negotiated; no compression (V.42bis P0=0). +DS3 both directions, accept any direction (V.42bis

P0=11). (Default.)

<compr_neg> Specifies whether or not the modem should continue to

operate if the desired result is not obtained.

+DS0 Do not disconnect if V.42bis is not negotiated by

the remote modem as specified in <direction>.

<max_dict> Specifies the maximum number of dictionary entries

(2048 entries) which should be negotiated (may be used by the DTE to limit the code word size transmitted, based on its knowledge of the nature of the data to be transmitted).

<max_string> Specifies the maximum string length (32 bytes) to be

negotiated (V.42bis P2). Report Commands: +DS? Reports Current or Selected Values. Response: +DS: <direction>,<compr_neg>,<max_dict>,<max_string> Example: +DS: 3,0,2048,32 for the defaults and 2048 entry max dictionary. +DS=? Reports Supported Range of Parameter Values. Response: +DS: (<direction> range),(< compr_neg > range),

(<max_dict> range),(<max_string> range) Example: +DS: (0,3),(0),(2048),(32)

Command: +DS44 V.44 Compression Select

Description: This extended-format compound parameter controls the V.44 data

compression function.

Defined Values: <direction> Decimal number that specifies the desired direction(s) of

operation of the data compression function; from the DTE point of view. +DS440 Negotiated, no compression. +DS441 Transmit only. +DS442 Receive only. +DS443 Both directions, accept any direction. (Default.)

<compress_negotiation> Decimal number that specifies whether or not

the modem should continue to operate if the desired result is not obtained. +DS440 Do not disconnect if V.44 is not negotiated by the remote

DCE as specified in <direction>. (Default.)

+DS441 Disconnect if V.44 is not negotiated by the remote DCE

as specified in <direction>.

<capability> Decimal number that specifies the use of stream method,

packet method, multi-packet method. +DS440 Stream method. (Default.) +DS441 Packet method. +DS442 Multi-packet method.

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<max_codewords_tx> Decimal number 256 to 2048 that specifies the

maximum number of codewords which should be negotiated in the transmit

direction. (Default = 2048.)

<max_codewords_rx> Decimal number 256 to 2048 that specifies the

maximum number of codewords which should be negotiated in the receive

direction. (Default = 2048.)

<max_string_tx> Decimal number 32 to 255 that specifies the maximum

string length to be negotiated in the transmit direction. (Default = 32.)

<max_string_rx> Decimal number 32 to 255 that specifies the maximum

string length to be negotiated in the receive direction. (Default = 32.)

<max_history_tx> Decimal number 2048 to 4096 that specifies the

maximum size of the history buffer to be negotiated in the transmit

direction. (Default = 4096.)

<max_history_rx> Decimal number 2048 to 4096 that specifies the

maximum size of the history buffer to be negotiated in the receive direction.

(Default = 4096.) Report Commands: +DS44? Reports Current or Selected Values. Response:

+DS44:<direction>,<compression_negotiation>,<capability>, <max_codewords_tx>,<max_codewords_rx>,<max_string_tx>, <max_string_rx>,<max_history_tx>,<max_history_rx>

Example: +DS44:3,0,0,2048,2048,32,32,4096,4096 For the

default setting.

+DS44=? Reports Supported Range of Parameter Values.

Response: +DS44:(list of supported <direction> values),(list of supported <compression_negotiation> values),(list of supported <capability> values),(list of supported <max_codewords_tx> values),(list of supported <max_codewords_rx> values),(list of supported <max_string_tx> values),(list of supported <max_string_rx> values),(list of supported <max_history_tx> values),(list of supported <max_history_rx> values)

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Command: +DR Data Compression Reporting

Description: This extended-format numeric parameter controls whether or not the

extended-format +DR: intermediate result code is transmitted from the

modem to the DTE. S95 bit 5 is reset to 0 for +DR=0 and is set to a 1 for

+DR=1. The more recent setting of +DR or S95 bit 5, and the W command

setting, determines the actual data compression result code reporting (see

S95 Parameter and W Command). Defined Values: +DR0 Data compression reporting disabled (no +DR result code

transmitted).

+DR1 Data compression reporting enabled (+DR result code

transmitted). (Default.) Report Commands: +DR? Reports Current or Selected Values. Response: +DR: <current value> Example: +DR: 1 For the default setting. +DR=? Reports Supported Range of Parameter Values. Response: +DR: (<value> range) Example: +DR: (0,1) Intermediate Result Code: +DR: <type> The +DR: <type> reported represents the current (negotiated or

renegotiated) modem-modem data compression type. If enabled, the intermediate result code is transmitted at the point after error control negotiation (handshaking) at which the modem has determined which data compression technique will be used (if any) and the direction of operation. The +DR intermediate result code, if enabled, is issued after the Error

Control Report (+ER) and before the final result code (e.g., CONNECT). The format of this result code is: Defined Values: <type> An alphanumeric code corresponding to the selected option:

NONE Data compression is not in use. V42B V.42bis is in use in both directions. V42B RD V.42 bis is in use in receive direction only V42B TD V.42 bis

is in use in transmit direction only V44 V.44 is in use in both

directions V44 RD V.44 is in use in receive direction only V44

TD V.44 is in use in transmit direction only ALT MNP 5

compression. Example: +DR: V42B

Command: %C Enable/Disable Data Compression

Description: Enables or disables data compression negotiation. The modem can only

perform data compression on an error-corrected link. The parameter value,

if valid, is written to S41 bits 0 and 1. Defined Values: %C0 Disables data compression. Resets S46 bit 1. %C1 Enables MNP 5 data compression negotiation. Resets S46 bit 1. %C2 Enables V.42 bis data compression. Sets S46 bit 1. %C3 Enables both V.42 bis and MNP 5 data compression. Sets S46 bit

1. (Default.) Result Codes: OK ERROR

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V.8/V.8bis Commands

Command: +A8E V.8 and V.8bis Operation Controls

Description: This command is defined for two conditions: as a parameter while the

modem is on-hook and as an action command while the modem is offhook. If enabled, V.8 negotiation does not preclude simultaneous implementation of other negotiation means (e.g., V.8bis, V.18, V.32bis Annex A).

This command is a compound parameter if issued while the modem is on-

hook, used to precondition V.8 and V.8bis originating and answering operation. It is issued by the DTE before the Dial (D) or Answer (A) command, regardless of the state of the +FCLASS parameter.

This command is an action command if issued while the modem is off-

hook, to (re)start V.8 or V.8bis negotiation. For example, if initial V.8 negotiation failed, but subsequent T.30 negotiation indicated V.8 capability, this command may be used to initiate V.8 negotiation.

Defined Values: <v8o> Decimal number which enables/disables issuance of +A8x

indications during modem-controlled V.8 origination negotiation.

1 Enable DCE-controlled V.8 origination negotiation without

+A8x indications. (Default.)

6 Enable DCE-controlled V.8 origination negotiation with +A8x

indications.

<v8a>= Decimal number which enables/disables issuance of +A8x

indications during modem-controlled V.8 answer negotiation.

1 Enable DCE-controlled V.8 answer negotiation without +A8x

indications. (Default.)

5 Enable DCE-controlled V.8 answer negotiation with +A8x

indications.

<v8cf>= Set the V.8 CI signal call function to the hexadecimal octet XY.

00 (Default.) 21 C1

<v8b>= Decimal number which enables/disables V.8bis negotiation.

0 Disable V.8bis negotiation. 1 Enable V.8bis negotiation. (Default.) Default values: 1,1,00,1,0,0 The ATD and ATA commands behave as specified in V.250, and +A8n

indications are not generated by the modem.

For subparameter values <v8o>=6 and <v8a>=5, the +A8I indications are

issued during the course of the V.8 session to notify the DTE when the relevant V.8 signals are received.

Report Commands: +A8E? Reports Current or Selected Values.

Response: +A8E: <v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]

Example: +A8E: 1,1,00,1,0,0 For the defaults +A8E=? Reports Supported Range of Parameter Values. Response: +A8E: (<v8o> range),(<v8a> range),(v8cf in octets), (<v8b> range),(<cfrange>),(<protrange>) Example: +A8E: (1,6),(1,5),(0,21,C1),(0,1),(0),(0)

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Command: +A8I: CI Signal Indication

Description: This indication is issued by an answering modem, if +A8E,<v8a> .0, to

indicate detection of a V.8 CI signal, and report the recovered Call Function octet(s).

Defined Values: <v8cf> A hexadecimal code octet representation of the Call Function

octet(s). +A8I:0 indicates that the modem timed out waiting for

CI. Example: +A8I:0 The modem timed out waiting for CI. +A8I:X YYY

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Diagnostic Commands

Command: #UD Last Call Status Report

Description: #UD is an action command requesting logged operation events reporting. It

does not take parameters and must be the last command in the command line.

The modem logs aspects of their operation for each call, and saves these

results until cleared by one of the following events:

Power off. Hard reset (e.g., negate DTR with &D3 set; reset button). Soft reset = ATZ or AT&F. ATD command issued. ATA command issued. Automatic answer (e.g., set register S0>0 and ring detected).

These results are NOT cleared by changing DTR, V.24 circuit 108.2, if

&D0, &D1 or &D2.

Data Call State Model:

For purposes of this command, there are four data call states, and

associated status issues:

1. Call Setup

-Calling DCE: get dial tone, generate dial digits, and detect call

progress signals.

-Answering DCE: detect ringing, detect Caller ID, etc.

2. Negotiation

-V.25 calling tone/answer tone exchanges

-V.8 or V.8bis call function negotiations

-V-series modem carrier detection and training

-Modem-to-modem protocols (e.g., V.42, V.42bis).

3. Data Transfer

-Bit-error rates, for each direction

-Rate renegotiation

-Retraining

4. Call Termination

-protocol disconnect signals

-carrier disconnect signals

-loss of carrier

-excessive error rates

Command Syntax:

In response to this command, the modem will report one or more lines of information text as defined below. Information text format conforms to V.250; each line is preceded by a <CR><LF> pair, and terminated by <CR><LF>. (CR and LF characters may be changed by writing new values to the contents of registers S3 and S4, respectively.)

The modem may generate a single line or multiple lines, followed by OK

result code. For example, if call setup failed, only that result is useful. Each information text line is formatted as follows, including one or more key=value pairs:

Response: DIAG <token key=value [[key=value] [key=value]] …> Defined Values: DIAG 5 hexadecimal characters (44h, 49h, 41h, 47h, 20h)

< Left angle bracket (less than sign) (3Ch) token Unique 32-bit

hexadecimal string 2A4D3263(32h, 4h1, 34h, 44h, 33h, 32h, 36h,

33h) space space character (20h) Key One- or two-digit hexadecimal number (see Key in Table 1-4) = Equal sign (3Dh) Value Any string as defined below (Table 1-4 - Table 1-9 as appropriate) > Right angle bracket (greater than sign) (3Eh)

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Unless otherwise noted, all values are hexadecimal numbers. Any numeric

values from tables in ITU V.58 are converted to hexadecimal. Multi-digit values are reported MSD first. Leading 0’s may be deleted. See examples in Table 1-13.

Monitoring an Active Connection

This command is intended for use after call termination. However, codes are defined so that a modem can respond before the first call is placed, and during a call for live monitoring purposes. For example, key 60, call termination, has value 1 defined, indicating that the call is still in progress. There are at least two ways to do this. First, the DTE could switch the modem to Online command state, issue the command, capture the responses and then issue an ATO command. For smoother online monitoring, in-band means defined in ITU V.80 are recommended if available in the modem. If V.80 methods are used, each response line shall be a separate extended in-band message.

Notes for Tables

1. The modem may insert a delay (e.g., 10 ms) between information text lines.

2. The code tables include values for data and fax calls. Some of the codes are applicable only to data calls (e.g., data compression), some are applicable only to call origination (e.g., busy, answering signal detection) and some are applicable only to the answering modem (e.g., calling signal detection).

callCleared codes from 3.6.4/V.58-1994

callCleared: indicates that the DCE has gone on-hook and that the previously existing network connection has been cleared. These values are hex values, converted from decimal in V.58. callCleared codes are described in Table 5-12.

Table 1-4. AT#UD Last Call Status Report Format Key Value(s) Definition

1 Table 1-5 Call Setup Result code 2 Table 1-6 Multi-media mode 3 Table 1-7 DTE-DCE interface mode 4 String V.8 CM octet string, same format as V.250, in quotes 5 String V.8 JM octet string, same format as V.250, in quotes 10 0-2F Received signal power level, in –dBm (0-43) 11 0-1F Transmit signal power level, in –dBm (e.g., 0-17) 12 0-64 Estimated noise level, in –dBm (e.g., 10-90) 17 0-FFF Round Trip delay, in units of ms 18 Table 1-8 V.34 INFO bit map 20 Table 1-9 Transmit Carrier Negotiation Result 21 Table 1-9 Receive Carrier Negotiation Result 22 0-1F40 Transmit Carrier symbol rate (0-8000) in symbol/s 23 0-1F40 Receive Carrier symbol rate (0-8000) in symbol/s 24 0-FA0 Transmit Carrier frequency (0-4000) in Hz 25 0-FA0 Receive Carrier frequency (0-4000) in Hz 26 0-FA00 Initial transmit carrier data rate (0-64000) in bit/s 27 0-FA00 Initial receive carrier data rate (0-64000) in bit/s 30 0-FF Temporary carrier loss event count 31 0-FF Carrier Rate re-negotiation event count 32 0-FF Carrier Retrains requested 33 0-FF Carrier Retrain requests granted 34 0-FA00 Final transmit carrier data rate in bit/s 35 0-FA00 Final receive carrier data rate in bit/s 40 Table 1-10 Protocol Negotiation Result 41 0-400 Error Control frame size in bytes 42 0-FF Error control link timeouts in transmission 43 0-FF Error control link NAKs received 44 Table 1-11 Compression Negotiation Result 50 0-2 Transmit flow control: 0=off; 1=DC1/DC3; 2=V.24 circuit 106/133 51 0-2 Receive flow control: 0=off; 1=DC1/DC3; 2=V.24 circuit 106/133 52 0-FFFFFFFF Transmit characters sent from DTE 53 0-FFFFFFFF Received characters sent to DTE 54 0-FFFF Transmit characters lost (data overrun errors from DTE)

0 2 digits Diagnostic Command Specification revision number, digit.digit

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55 0-FFFF Received characters lost (data overrun errors to DTE) 56 0-FFFFFFFF Transmit I- Frame count, if error control protocol running 57 0-FFFFFFFF Received I-Frame count, if error control protocol running 58 0-FFFF Transmit I-Frame error count, if error control protocol running 59 0-FFFF Received I- Frame error count, if error control protocol running 60 Table 1-12 Termination Cause 61 0-FF Call Waiting event count

Table 1-5. Call Setup Result Codes Code Definition

0 No previous call (modem log has been cleared since any previous calls) 1 No dial tone detected 2 Reorder signal detected, network busy 3 Busy signal detected 4 No recognized signal detected (e.g., no signal, or nothing recognizable) 5 Voice detected * if this is a voice modem (e.g., V.253) operating in voice mode (e.g.,

+FCLASS=8.0) 7 Data Answering signal detected (e.g., V.25 ANS, V.8 ANSam) 8 Data Calling signal detected (e.g., V.25 CT, V.8 CI) 9 Fax Answering signal detected (e.g., T.30 CED, DIS) A Fax Calling signal detected (e.g., T.30 CNG) B V.8bis signal detected

Table 1-6. Multimedia Modes Code Definition

0 Data Only 1 Fax Only 2 Voice 9 Video-telephony, H.324 A Other V.80 call

Table 1-7. DTE-DCE modes Code Definition

0 Async data 1 V.80 transparent synchronous mode 2 V.80 framed synchronous mode

Table 1-8. V.34 INFO bit report Bits Source bits Definition

31-30 INFO0 bit 20; 0 20-29 INFOc bits 79-88 16-19 INFOc bits 26-29 or 35-38 or 44- 47 or 53-56- or 62-65 or 71-74 Pre-emphasis field, selected by the symbol rate chosen 12-15 INFOa bits 26-29 10-11 MP bit 50; 0 0-9 INFOa bits 40-49

Table 1-9. gstnModulationSchemeActive from 3.7.2/V.58 Value Description

0 V.17 (G3 Fax call) 1 V.21 2 V.22 3 V.22bis 4 V.23 Constant Carrier (1200/75) 8 V.27ter (G3 Fax call) 9 V.29 HD (G3 Fax call) A V.32 B V.32bis C V.34 E V.90 and V.92 81 56K 84 Bell 212A 85 Bell 103

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Table 1-10. errorControl Active from 3.5.2/V.58 Value Description

0 Disable/none 1 V.42 LAPM 2 V.42 Alternative protocol (MNP™) 80 MNP10™

Table 1-11. compressionActive from 3.2.2/V.58 Value Description

0 None 1 V.42bis and V.44 80 MNP5™

Table 1-12. callCleared codes from 3.6.4/V.58-1994 Value Description Notes

0 CauseUnidentified Call setup issues 1 No Previous call Not in V.58 2 Call is still in progress Not in V.58 3 Call Waiting signal detected Not in V.58, only if modem can detect it 4 Delayed Same as value 2A, CallAttemptsLimitExceeded 19 InactivityTimerExpired 1F cct108isOffInhibitsDial DTR low 20 cct108turnedOff DTR drop 29 BlacklistedNumber 2A CallAttemptsLimitExceeded Same as “Delayed”, see ETS 300 001 2B ExtensionPhoneOff-hook If extension detection supported 2C CallSetupFailTimerExpired e.g., S7 timeout 2D IncomingCallDetected If incoming call while sending dial command. 2E LoopCurrentInterrupted 2F NoDial tone 31 ReorderTone Fast busy 33 EngagedTone Busy 34 LongSpaceDisconnect And if modem program to abort on long space 3C CarrierLost Signal Converter 3D TrainingFailed 3E NoModulationinCommon 3F RetrainFailed 40 RetrainAttemptCountExceeded 41 GstnCleardownReceived 42 FaxDetected If this was not a fax call attempt 46 InTestMode Test 50 AnyKeyAbort Call Control 51 DteHangupCommand If ATH was used to terminate the previous call. 52 DteResetCommand If ATZ was used to terminate the previous call. 5A FrameReject Error Control 5B NoErrorControlEstablished Error control was required 5C ProtocolViolation 5D n400exceeded LAPM retransmission Count Timer 5E NegotiationFailed 5F DisconnectFrameReceived 60 SabmeFrameReceived 64 LossOfSynchronization Data Compression

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Example Modem Response and Usage

Example #UD commend response are shown in Table 1-13.

Table 1-13. Completed Data Call, with some errors and rate retrain during the call

Modem Response Line Description

DIAG <2A4D3263 0=09> This is version 0.9 DIAG <2A4D3263 1=06 2=0 3=0> Data Answer signal detected; Data only;

Character async

DIAG <2A4D3263 5=”C14513902A” 6=”A145”> V.8 Call Menu indicates:

V.8 Joint Menu selects:

DIAG <2A4D3263 10=1F 11=0C 12=52> Receive level = -31 dBm; transmit level = -12

dBm; noise level = -82 dBm

DIAG <2A4D3263 14=03 15=05 16=10> Far end echo delay in milliseconds; Far end

echo loss in dB; Near end echo loss = 16 dB

DIAG <2A4D3263 20=C 22=780 24=0C80 26=79E0> Transmitter: V.34 training completed;

V.34 carrier frequency = 1920; V.34 symbol rate = 3200; initial transmit rate is 31200 bit/s

DIAG <2A4D3263 21=D 25=1F40 27=DAC0> Receiver: V.90 training completed; V.90

symbol rate = 8000; initial receive rate is 56000 bit/s

DIAG <2A4D3263 30=00 31=03 32=01 33=01> No carrier loss events, 3 carrier rate

renegotiations attempted; 1 carrier retrain requested; 1 carrier retrain granted

DIAG <2A4D3263 34=7080 35=CB20> Final transmit rate is 28800 bit/s; final

receive rate is 52000 bit/s

DIAG <2A4D3263 40=1 41=100> LAPM negotiation completed; frame size =

256 DIAG <2A4D3263 42=0 43=0> No error control timeout or link NAKs DIAG <2A4D3263 44=1 45=400> V.42bis data compression used;

dictionary size = 1024 DIAG <2A4D3263 50=2 51=2> Hardware transmit and receive flow control DIAG <2A4D3263 52=343CC 54=0> 213964 DTE characters transmitted, w/o

underrun DIAG <2A4D3263 53=7230E6 55=47> 7483622 DTE characters received, 71

characters lost due to receive data overrun DIAG <2A4D3263 56=29D 58=0001> 597 (decimal) frames transmitted, with 1

frame error DIAG <2A4D3263 58=2A4B 59=0004> 10827 (decimal) frames received, with 4

frame errors DIAG <2A4D3263 60=51> Local PC initiated hangup

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Compatibility Commands

Command: &L Leased Line Operation

Description: Requests leased line or dial-up operation. This command is provided for

compatibility only; no mode change is performed, dial-up operation continues. The OK response is returned for a valid parameter, but no other

action is performed. The parameter value, if valid, is written to S27 bit 2. Defined Values: &L0 Requests dial-up operation. Dial-up operation continues. Result Codes: OK ERROR

Command: )M Enable Cellular Power Level Adjustment

Description: This command is included for compatibility only and has no effect other

than returning a result code. Defined Values: )M0 )M1 )M2 Result Codes: OK ERROR

Command: @M Initial Cellular Power Level Setting

Description: This command is included for compatibility only and has no effect other than

returning a result code. Defined Values: @M0 @M30 Result Codes: OK. ERROR

Command: :E Compromise Equalizer Enable Command

Description: This command is included for compatibility only and has no effect other than

returning a result code. Defined Values: :E0 :E1 Result Codes: OK ERROR

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Fast Connect Commands

Command: $F FastConnect Control

Description: Allows configuring of the client modem to connect to a central site modem

that supports non-standard V.22 and V.22 bis FastConnect protocols.

Specifies the initial requested mode of operation when the modem is

operating as the originator. The options are: Defined Values: $F0 Normal connection (Default) $F1 FastConnect without answer tone $F2 Reserved $F3 FastConnect with answer tone

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V.92 +P and –Q Commands

This section describes the +P (PCM DCE) and –Q commands and parameters used to control the V.92 Mode operation.

Command: +PCW Call Waiting Enable

Description: Controls the operation of the modem in the presence of call waiting. Defined Values: +PCW0 Request modem-on-hold if enabled by +PMH and collect caller

ID information if enabled by +VRID. Toggle V.24 circuit 125.

(Default.) +PCW1 Hang-up. +PCW2 Ignore call waiting. Result Codes: OK ERROR Report Commands: +PCW? Reports Selected Value(s). Response: +PCW: <value> Example: +PCW: 0 For the default setting. +PCW=? Reports Supported Range of Parameter Values

Response: +PCW: (<value> range) Example: +PCW: (0,1,2)

Command: +PMH Modem-on-Hold Enable

Description: Controls the selection of modem-on-hold in the modem. The action of the

modem in response to modem-on-hold events is determined by the state of this command as well as the state of a negotiated handshake with a V.92-

compliant server in V.92 Mode. Defined Values: +PMH0 Modem-on-hold enabled in V.92 Mode. (Default.) +PMH1 Disabled modem-on-hold. Result Codes: OK 0 or 1 in V.92 Mode (see the +MS command) ERROR Report Commands: +PMH? Reports Current or Selected Value. Response: +PMH: <current value> Example: +PMH: 0 For the default setting.

+PMH=? Reports Supported Range of Parameter Values.

Response: +PMH: (<value> range) Example: +PMH: (0,1)

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Command: +PMHR Initiate Modem-on-Hold

Description: Requests the modem to initiate or to confirm a modem-on-hold procedure.

The modem will return ERROR if modem-on-hold is not enabled or if the

modem is in an idle condition. The modem will return the string response

+PMHR: <value> where <value> is a decimal value corresponding to the

status of the modem's hold exchange procedure as defined below. This

response may be delayed depending upon the context under which the

+PMHR command is made, i.e., if the +PMHR is in response to an

incoming modem-on-hold or if it is initiating a request.

Note: If modem-on-hold is enabled but the remote server does not support

V.92 then the modem will always report 0 to show that the hold request is

denied. Response: +PMHR:<value> The value corresponds to the maximum hold time the server or hold-

granting modem will allow. +PMHR0 V.92 MOH request denied or not available. +PMHR1 MOH with 10-second timeout Granted. +PMHR2 MOH with 20-second timeout Granted. +PMHR3 MOH with 30-second timeout Granted. +PMHR4 MOH with 40-second timeout Granted. +PMHR5 MOH with 1-minute timeout Granted. +PMHR6 MOH with 2-minute timeout Granted. +PMHR7 MOH with 3-minute timeout Granted. +PMHR8 MOH with 4-minute timeout Granted +PMHR9 MOH with 6-minute timeout Granted. +PMHR10 MOH with 8-minute timeout Granted. +PMHR11 MOH with 12-minute timeout Granted. +PMHR12 MOH with 16-minute timeout Granted. +PMHR13 MOH with indefinite timeout Granted. Result Codes: OK 0-13 in V.92 Mode (+MS=V92) ERROR

Command: +PMHT Modem-on-Hold Timer

Description: Controls whether or not the modem will grant or deny a modem-on-hold

(MOH) request as well as setting the MOH Timeout value. Defined Values: +PMHT0 Deny V.92 modem-on-hold Request (Default.) +PMHT1 Grant MOH with 10-second timeout +PMHT2 Grant MOH with 20-second timeout +PMHT3 Grant MOH with 30-second timeout +PMHT4 Grant MOH with 40-second timeout +PMHT5 Grant MOH with 1 minute timeout +PMHT6 Grant MOH with 2 minute timeout +PMHT7 Grant MOH with 3 minute timeout +PMHT8 Grant MOH with 4 minute timeout +PMHT9 Grant MOH with 6 minute timeout +PMHT10 Grant MOH with 8 minute timeout +PMHT11 Grant MOH with 12 minute timeout +PMHT12 Grant MOH with 16 minute timeout +PMHT13 Grant MOH with indefinite timeout Result Codes: OK 0-13 in V.92 Mode (+MS=V92) ERROR Report Commands: +PMHT? Reports Current or Selected Values. Response: +PMHT: <value> Example: +PMHT: 0 For the default setting.

+PMHT=? Reports Supported Range of Parameter Values.

Response: +PMHT: (<value> range) Example: +PMHT: (0,1,2,3,4,5,6,7,8,9,10,11,12,13)

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Command: +PIG PCM Upstream Ignore

Description: Controls the selection of PCM upstream in the modem. The actual state of

PCM upstream is determined by the state of this command as well as the

state of a negotiated handshake with a V.92-compliant server in V.92

Mode. Defined Values: +PIG0 Enable PCM upstream negotiation. +PIG1 Disable PCM upstream negotiation. (Default.) Result Codes: OK 0 or 1 in V.92 Mode (+MS=V.92) ERROR Report Commands: +PIG? Reports Selected Value(s). Response: +PIG: <value> Example: +PIG: 1 For the default setting.

+PIG=? Reports Supported Range of Parameter Values.

Response: +PIG: (<value> range) Example: +PCW: (0,1)

Command: +PMHF V.92 Modem-on-Hold Hook Flash

Description: Causes the modem to initiate the flash hook sequence when in the

modem-on- hold procedure. This enables switching to the second call

(incoming or outgoing). This command applies only to V.92 modem-on-hold. There are no

parameters associated with this command. Result Code: OK When the modem completes the flash hook sequence. ERROR If this command is initiated and the modem is not on hold.

Command: +PQC V.92 Phase 1 and Phase 2 Control

Description: Controls the global enabling or disabling of the V.92 shortened Phase 1

and Phase 2 startup procedures. This command is used in conjunction with

the +PSS command. Defined Values: +PQC0 Enable Short Phase 1 and Short Phase 2. (Default.) +PQC1 Enable Short Phase 1 only. +PQC2 Not supported. +PQC3 Disable Short Phase 1 and Short Phase 2. Result Codes: OK 0, 1, or 3 in V.92 Mode (+MS=V.92) ERROR Report Commands: +PQC? Reports Selected Values. Response: +PQC: <value> Example: +PQC: 0 +PQC=? Reports Supported Range of Parameter Values. Response: +PQC: (<value> range) Example: +PQC: (0,1,3)

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Command: +PSS Use Short Sequence

Description: Causes a calling modem to force either a V.92 short or full startup

sequence as defined by the +PQC command on the next and subsequent

connections. Defined Values: +PSS0 The modems decide whether or not to use the short startup

procedures. The short startup procedures can only be used if

enabled by the +PQC command. (Default.) +PSS1 Reserved. +PSS2 Forces the use of the full startup procedures on the next and

subsequent connections independent of the setting of the

+PQC command. Result Codes: OK 0 - 2 in V.92 Mode (+MS=V.92) ERROR Report Commands: +PSS? Reports Selected Values. Response: +PSS: <value> Example: +PSS: 0 For the default <value>. +PSS=? Reporting Supported Range of Parameter Values: Response: +PSS: (<value> range) Example: +PSS: (0,1,2)

Command: -QCPC Force Full Startup Procedure on Next Connection

Description: Causes the modem to use full startup procedures on the next connection

attempt regardless of the setting of the +PQC command. After this attempt, the modem will select the startup procedure as defined by the +PQC command. If a shortened startup procedure is enabled by the +PQC command, then the quick connect profile will also be updated on the next

connection attempt. Result Code: OK In V.92 Mode (+MS=V.92) ERROR

Command: -QCPS Enable Quick Connect Profile Save

Description: This command controls whether or not the modem will save the generated

quick connect profile. Defined Values: -QCPS0 Do not allow the quick connect profile to be saved.

-QCPS1 Allow the quick connect profile to be saved. (Default.) Result Codes: OK in V.92 Mode (+MS=V.92) and quick connect is enabled (+PSS = 0) ERROR Report Commands: -QCPS? Reports Selected Value(s). Response: -QCPS: <value> Example: -QCPS: 1 For the default setting.

-QCPS=? Reports Supported Range of Parameter Values. Response: -QCPS: (<value> range) Example: -QCPS: (0,1)

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S-Registers

Certain modem values, or parameters, are stored in memory locations called S-registers. Use the S command to read or to alter the contents of S-registers (see previous section). * Register value may be stored on one of two user profiles with the command &W.

S0 1 ring 0–255 0 Number of Rings to Auto-Answer: Sets the number of rings until

the modem answers. ATS0=0 disables autoanswer completely. *

S1 1 ring 0–255 0 Ring Counter: Counts the rings that have occurred. S1 is cleared if

no rings occur over eight-second intervals.

S2 decimal 0–255 43 (+) Escape Character: Holds the decimal value of the ASCII character

used as the escape character. The default value corresponds to an ASCII ‘+’. A value over 127 disables the escape process; e.g., no escape character will be recognized.*

S3 decimal 0–127 13 (^M) Carriage Return Character: Sets the command line and result code

terminator character. Pertains to asynchronous operation only.

S4 decimal 0–127 10 (^J) Line Feed Character: Sets the character recognized as a line feed.

Pertains to asynchronous operation only. The Line Feed control character is output after the Carriage Return Control character if verbose result codes are used.

S5 decimal 0–255 8 (^H) Backspace Character : Sets the character recognized as a

backspace. Pertains to asynchronous operation only. The modem will not recognize the Backspace character if it is set to a value that is greater than 32 ASCII. This character can be used to edit a command line. When the echo command is enabled, the modem echoes back to the local DTE the Backspace character, an ASCII space character and a second Backspace character; this means a total of three characters are transmitted each time the modem processes the Backspace character.

S6 seconds 2–255 2 Wait Time Before Blind Dialing or for Dial Tone: 1. Sets the length

of time, in seconds, that the modem will wait before starting to dial after going off-hook when blind dialing. This operation, however, may be affected by some ATX options according to country restrictions. The “Wait for Dial Tone” call progress feature (W dial modifier in the dial string) will override the value in register S6. (When configured for US).

2. Sets the length of time, in seconds, that the modem will wait for dial tone when encountering a “W” dial modifier before returning NO DIAL TONE result code. (W class). Default is country-dependent. The modem always pauses for a minimum of 2 seconds, even if the value of S6 is less than 2 seconds. *

S7 seconds 1–255* 50 Wait Time for Carrier, Silence, or Dial Tone:

1. Sets the length of time, in seconds, that the modem will wait for

carrier before hanging up. The timer is started when the modem finishes dialing (originate), or 2 seconds after going off-hook (answer). In originate mode, the timer is reset upon detection of answer tone if allowed by country restrictions.

2. Sets the length of time, in seconds, that modem will wait for silence when encountering the @ dial modifier before continuing with the next dial string parameter.

3. Sets the length of time, in seconds, that the modem will wait for dial tone when encountering a “W” dial modifier before continuing with the next dial string parameter. (US model.)

The default is country dependent. *

S8 seconds 2–255 2 Pause Time for Dial Delay: Sets the time, in seconds, that the

modem must pause when the “,” dial modifier is encountered in the dial string. *

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compatibility only. No value can be written. Responds with default value. *

S10 0.1 s 1–255 14 Lost Carrier to Hang Up Delay: Sets the length of time, in tenths of

a second that the modem waits before hanging up after a loss of carrier. This allows for a temporary carrier loss without causing the local modem to disconnect. When register S10 is set to 255, the modem functions as if a carrier is always present. *

The actual interval the modem waits before disconnecting is the value

in register S10 minus the value in register S9. Therefore, the S10 value must be greater than the S9 value or else the modem disconnects before it recognizes the carrier.

Note: For Call Waiting detection, if the modem is set to US country

code and S10 >=16, then the modem will detect the Call Waiting tone and hang-up the line. If S10 <16, the modem will not detect Call Waiting tone.

S11 0.001 s 50–255 95 DTMF Tone Duration: 1. For US models, S11 sets the duration of

tones in DTMF dialing (has no effect on pulse dialing).

2. For W-class models, S11 is a country parameter. The default is country dependent. *

S12 0.02 s 0–255 50 Escape Prompt Delay (EPD): Defines the maximum period, in

fiftieths of a second, allowed between receipt of the last character of the three escape character sequence from the DTE and sending of the OK result code to the DTE. If any characters are detected during this time, the OK will not be sent. Sending of the OK result code does not affect entry into command mode. (See 3.1.3). *

S14 138 (8Ah) General Bit-Mapped Options Status: Indicates the status of

command options. Bit 0 This bit is ignored.

Bit 1 Command echo (En)

0 = Disabled (E0) 1 = Enabled (E1) (Default.)

Bit 2 Quiet mode (Qn)

0 = Send result codes (Q0) (Default.) 1 = Do not send result codes (Q1)

Bit 3 Result codes (Vn)

0 = Numeric (V0)

1 = Verbose (V1) (Default.) Bit 4 Reserved Bit 5 Tone (T)/Pulse (P)

0 = Tone (T) (Default.)

1 = Pulse (P) Bit 6 Reserved Bit 7 Originate/Answer

0 = Answer

1 = Originate (Default.)

S19 is supported for backward compatibility only. No value can be written. Responds with default value.

S16 0 Test Mode Bit-Mapped Options Status: Indicates the test in

progress status. Bit 0 Local analog loopback

0 = Disabled (Default.)

1 = Enabled (&T1) Bits 1-7 Not used

S19 and S20 Reserved

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command options. Bits 0 - 1 Reserved (0) Bit 2 CTS behavior (&Rn) 0 = CTS tracks RTS (&R0)

1 = CTS always on (&R1) (Default.)

Bits 3-4 DTR behavior (&Dn)

0 = &D0 selected 1 = &D1 selected 2 = &D2 selected (Default.) 3 = &D3 selected

Bit 5 RLSD (DCD) behavior (&Cn)

0 = &C0 selected 1 = &C1 selected (Default.)

Bit 6 DSR behavior (&Sn)

0 = &S0 selected (Default.) 1 = &S1 selected

Bit 7 Long space disconnect (Yn)

0 = Y0 (Default.) 1 = Y1

S22 117 (75h) Speaker/Results Bit-Mapped Options Status: Indicates the status

of command options. Default: 117 (75h) (01110101b) Bits 0-1 Speaker volume (Ln)

0 = Off (L0)

1 = Low (L1) (Default.)

2 = Medium (L2)

3 = High (L3) Bits 2-3 Speaker control (Mn)

0 = Disabled (M0)

1 = Off on carrier (M1) (Default.)

2 = Always on (M2)

3 = On during handshake (M3) Bits 4-6 Limit result codes (Xn)

0 = X0

4 = X1

5 = X2

6 = X3

7 = X4 (Default.) Bit 7 Reserved

S23 0 General Bit-Mapped Options Status: Indicates the status of

command options. Bits 0-6 Not used Bits 6-7 Guard tone (&Gn)

0 = None (&G0) (Default.)

1 = None (&G1)

2 = 1800 Hz (&G2)

S24 seconds 0–255 0 Sleep Inactivity Timer: Sets the length of time, in seconds, that the

modem will operate in normal mode with no detected telephone line or DTE line activity before entering low-power sleep mode. The timer is reset upon any DTE line or telephone line activity. If the S24 value is zero, neither DTE line nor telephone inactivity will cause the modem to enter the sleep mode.

S25 0.01 s 0–255 5 Delay to DTR OFF: Sets the length of time that the modem will

ignore DTR for taking the action specified by &Dn. Its units are seconds for synchronous modes and one hundredths of a second for other modes.

S26 0.01 s 0–255 1 RTS-to-CTS Delay: Sets the time delay, in hundredths of a second,

before the modem turns CTS ON after detecting an OFF-to-ON transition on RTS when &R0 is commanded. Pertains to synchronous operation only.

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command options. Default: 73 (49h) (01001001b) Bits 0, 1, 3 Synchronous/asynchronous selection (&Mn/&Qn) 3 1 0 0 0 0 &M0 or &Q0

0 0 1 &M1 or &Q1 0 1 0 &M2 or &Q2 0 1 1 &M3 or &Q3 1 0 0 Reserved 1 0 1 &Q5 (Default.) 1 1 0 &Q6

Bit 2 Leased line control (&Ln)

0 = Dial up line (&L0) (Default.)

Bits 4 - 5 Internal clock select (&Xn)

0 = Internal clock (&X0) (Default.) 1 = External clock (&X1) 2 = Slave clock (&X2)

Bit 6 CCITT/Bell mode select (Bn)

0 = CCITT mode (B0 – Default for MT5600SMI) 1 = Bell mode (B1 – Default for MT5656SMI)

Bit 7 - Reserved

S28 0 General Bit-Mapped Options Status: Indicates bit mapped options

status. Default: 0 Bits 0 - 1 Reserved Bit 2 Reserved (always 0). Bits 3 - 4 Pulse dialing (&Pn)

0 = 39%-61% make/break ratio at 10 pulses per second (&P0) 1 = 33%-67% make/break ratio at 10 pulses per second (&P1) 2 = 39%-61% make/break ratio at 20 pulses per second (&P2) 3 = 33%-67% make/break ratio at 20 pulses per second (&P3)

Bit 5-7 Reserved

S29 10 ms 0–255 70 Flash Dial Modifier Timer: Sets the length of time, in units of 10 ms,

that the modem will go on-hook when it encounters the flash (!) dial modifier in the dial string. S29 is a country dependent parameter. The S29 value cannot be changed using S29=XX. Default: 70 (700 ms) for U.S.

S30 10 s 0–255 0 Disconnect Inactivity Timer: Sets the length of time, in tens of

seconds, that the modem will stay online before disconnecting when no data is sent or received. In error-correction mode, any data transmitted or received will reset the timer. In other modes, any data transmitted will reset the timer. The timer is inoperative in synchronous mode.

S31 192 (C0h) General Bit-Mapped Options Status: Indicates bit mapped options

status. Default: 192 (C0h) (11000000b) Bit 0 Single line connect message enable/disable (\Vn)

0 = Messages controlled by S95, Wn and Vn (\V0) (Default.)

1 = Single line connect message (\V1) Bit 1 Reserved (0) Bits 2-3 Error correction progress messages (Wn)

0 = DTE speed only (W0) (Default.)

1 = Full reporting (W1)

2 = DCE (line) speed only (W2) Bits 4-5 Caller ID (+VCID)

0 = Caller ID disabled (+VCID=0) (Default.)

1 = Short (formatted) Caller ID enabled (+VCID=1)

2 = Long (unformatted) Caller ID enabled (+VCID=2) Bits 6-7 Reserved (Default = 11b)

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upon a LAPM failure. These fallback options are initiated immediately upon connection if S48=128. If an invalid number is entered, the number is accepted into the register, but S36 will act as if the default value has been entered. *

Default: 7 (00000111b)

Bits 0-2

0 = Modem disconnects.

1 = Modem stays on-line and a Direct mode connection is

established.

2 = Reserved.

3 = Modem stays on-line and a Normal mode connection is

established.

4 = An MNP connection is attempted and if it fails, the modem

disconnects.

5 = An MNP connection is attempted and if it fails, a Direct

mode connection is established.

6 = Reserved.

7 = An MNP connection is attempted and if it fails, a Normal

mode connection is established. (Default.) Bits 3-7 Reserved

S38 seconds 0–255 20 Delay Before Forced Hang Up: Specifies the delay between the

modem's receipt of the H command to disconnect (or ON-to-OFF transition of DTR if the modem is programmed to follow the signal), and the disconnect operation. Applicable to error-correction connection only. This parameter can be used to ensure that data in the modem buffer is sent before the modem disconnects.

If S38 is set to a value between 0 and 254, the modem will wait that

number of seconds for the remote modem to acknowledge all data in the modem buffer before disconnecting. If time expires before all data is sent, the NO CARRIER result code will be issued to indicate that data has been lost. If all data is transmitted prior to time-out, the response to the H0 command will be OK.

If S38 is set to 255, the modem does not time-out and continues to

attempt to deliver data in the buffer until the connection is lost or the data is delivered.

S39 3 Flow Control Bit-Mapped Options Status. Default: 3 (00000011b)

Bits 0-2 Status of command options

0 = No flow control

3 = RTS/CTS (&K3) (Default.)

4 = XON/XOFF (&K4)

5 = Transparent XON (&K5)

6 = Both methods (&K6)

Bits 3-7 Reserved

S40 104 (68h) General Bit-Mapped Options Status. Indicates the status of

command options.

Default: 104 (68h) (01101000b) Bits 0-1 MNP Extended Services (-Kn)

0 = Disable extended services (-K0) (Default.)

1 = Enable extended services (-K1)

2 = Enable extended services (-K2)

Bit 2 Reserved Bits 3-5 Break Handling (\Kn)

0 = \K0

1 = \K1

2 = \K2

3 = \K3

4 = \K4

5 = \K5 (Default.)

Bits 6-7 Reserved*

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command options. *

Default: 13 (C3h) (00001101b) Bits 0 -1 Compression selection (%Cn) 0 = Disabled (%C0) 1 = MNP 5 (%C1) 2 = V.42 bis (%C2) 3 = MNP 5 and V.42 bis (%C3) (Default.) Bits 2, 6 Auto retrain and fallback/fall forward (%En)

Bit 6 Bit 2 Meaning

0 0 Retrain and fallback/fall forward disabled (%E0)

0 1 Retrain enabled (%E1)

1 0 Fallback/fall forward enabled (%E2) (Default.)

Bit 3 Reserved Bits 4-5 Reserved Bit 7 Reserved

S46 138 Data Compression Control. Controls selection of compression. * The following actions are executed for the given values:

S46=136 Execute error correction protocol with no compression.

S46=138 Execute error correction protocol with compression. (Default.)

S48 7 V.42 Negotiation Control. Negotiation process determines the

capabilities of the remote modem. However, when the capabilities of the remote modem are known and negotiation is unnecessary, this process can be bypassed if so desired.

Range: 0, 7, or 128 If an invalid number is entered, it is accepted into

the S-Parameter, but S48 will act as if 128 has been entered.

S48=0 Disable negotiation; bypass the detection and negotiation

phases; and proceed with LAPM. S48=7 Enable negotiation. (Default.) S48=128 Disable negotiation; bypass the detection and negotiation

phases; and proceed at once with the fallback action specified

in S36. Can be used to force MNP.

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result code, a value is written to S86 Register to help determine the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message. The code definitions are:

S86=0 Normal hangup, no error occurred.

S86=1 Reserved. S86=2 Reserved. S86=3 Call Waiting caused disconnect. S86=4 Physical carrier loss. S86=5 No error correction at the other end. S86=6 No response to feature negotiation. S86=7 This modem is async only; the other modem is sync only. S86=8 No framing technique in common. S86=9 No protocol in common. S86=10 Bad response to feature negotiation. S86=11 No sync information from the remote modem. S86=12 Normal hangup initiated by the remote modem. S86=13 Retransmission limit reached. S86=14 Protocol violation occurred. S86=15 Lost DTR. S86=16 Received GSTN cleardown. S86=17 Inactivity timeout. S86=18 Speed not supported. S86=19 Long space disconnect. S86=20 Key abort disconnect. S86=21 Clears previous disconnect reason. S86=22 No connection established. S86=23 Disconnect after three retrains. S86=24 Call Waiting tone detected. S86=25 Extension pickup detected. S86=26 Remote hangup detected.

S91 dBm 0–15 10 PSTN Transmit Attenuation Level. In non-PCM modes (V.90 or

K56flex are PCM modes), S91 sets the transmit attenuation level from 0 to 15 dBm for the PSTN mode, resulting in a transmit level from 0 to

-15 dBm. In some countries, the transmit level may not be changed and there are checks to prevent transmit attenuation level change. The default is country dependent.

S95 0 Extended Result Codes Control. A bit set to a 1 in this parameter,

in conjunction with the W command, will enable the corresponding extended result code. *

The +MR, +ER, and +DR settings also control S95 bits 2, 3, and 5,

respectively. The more recent settings of +MR, +ER, and +DR, or host writing of S95 bits 2, 3, and 5, along with the W command setting, determine the corresponding actual result code reporting (see +MR, +ER, DR, and W commands). Bit 0 CONNECT result code indicates DCE speed instead of DTE speed. Bit 1 Append/ARQ to CONNECT XXXX result code in error-correction

mode (XXXX = rate).

Bit 2 Enable +MCR: XXXX result code (XXXX = modulation) and

+MRR: XXXX result code (XXXX = rate). (Also, see +MR.) Bit 3 Enable +ER: XXXX result code (XXXX = protocol identifier). Bit 4 Reserved. Bit 5 Enable +DR: XXXX result code (XXXX = compression type). Bits 6-7 Reserved.

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S210 0–255 13 (0Dh) V.34 Symbol Rate. The bits in this parameter control V.34 symbols rates

and enable/disable V.34 asymmetric rates. This parameter is used for diagnostic purposes only.

Default: 13 (0Dh) (00001101b) Bits 0 -2 Selects the range of allowed V.34 symbol rates. 2 0 0 0 2400 only

Bit 3 Enable/disable V.34 asymmetric rates. 0 = Disable asymmetric rates

Bits 4-7 Reserved.

Examples S210=13 Enable asymmetric rates with all symbol rates available

S210=5 Disable asymmetric rates with all symbol rates

S210=8 Enable asymmetric rates with only 2400 baud available. S210=11 Enable asymmetric rates with 2400 to 3000 baud

* Register value may be stored on one of two user profiles with the &W command.

1 0 Symbol Rates (baud)

0 0 1 2400 only (no 2734) 0 1 0 2400, 2800 0 1 1 2400, 2800, 3000 1 0 0 2400, 2800, 3000, 3200 1 0 1 2400, 2800, 3000, 3200, 3429 (Default.)

1 = Enable asymmetric rates (Default.)

(Default.).

available.

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Result Codes

In command mode your modem can send responses called result codes to your computer. Result codes are used by communications programs and can also appear on your monitor.

Result Codes

Short Form Long Form

+F4 +FCERROR 0 OK 1 CONNECT 2 RING 3 NO CARRIER 4 ERROR 5 CONNECT1200 6 NO DIAL TONE 7 BUSY 8 NO ANSWER 9 CONNECT600 10 CONNECT 2400 11 CONNECT 4800 12 CONNECT 9600 13 CONNECT 7200 14 CONNECT 12000 15 CONNECT 14400 16 CONNECT 19200 17 CONNECT 38400 18 CONNECT 57600 19 CONNECT 115200 20 CONNECT 230400 22 CONNECT 75TX/1200RX 23 CONNECT 1200TX/75RX 24 DELAYED 32 BLACKLISTED 33 FAX 35 DATA 40 +MRR: 300 44 +MRR: 1200/75 45 +MRR: 75/1200 46 +MRR: 1200 47 +MRR: 2400 48 +MRR: 4800 49 +MRR: 7200 50 +MRR: 9600 51 +MRR: 12000 52 +MRR: 14400 53 +MRR: 16800 54 +MRR: 19200 55 +MRR: 21600 56 +MRR: 24000 57 +MRR: 26400 58 +MRR: 28800 59 CONNECT 16800 60 CONNECT 21600 62 CONNECT 24000 63 CONNECT 26400 64 CONNECT 28800 66 +DR: A LT 67 +DR: V 42B 69 +DR: N ONE 70 +ER: N ONE

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Short Form Long Form

77 +ER: L APM 78 +MRR: 31200 79 +MRR: 33600 80 +ER: A LT 81 +ER: A LT-CELLULAR 83 LINE-IN-USE 84 CONNECT 33600 91 CONNECT 31200 134 +MCR: B 103 135 +MCR: B 212 136 +MCR: V 21 137 +MCR: V 22 138 +MCR: V 22B 139 +MCR: V 23 140 +MCR: V 32 141 +MCR: V 32B 142 +MCR: V 34 144 +MCR: K 56 145 +MCR: V 90 150 +MRR: 32000 151 +MRR: 34000 152 +MRR: 36000 153 MRR: 38000 154 +MRR: 40000 155 +MRR: 42000 156 +MRR: 44000 157 +MRR: 46000 158 +MRR: 48000 159 +MRR: 50000 160 +MRR: 52000 161 +MRR: 54000 162 +MRR: 56000 165 CONNECT 32000 166 CONNECT 34000 167 CONNECT 36000 168 CONNECT 38000 169 CONNECT 40000 170 CONNECT 42000 171 CONNECT 44000 172 CONNECT 46000 173 CONNECT 48000 174 CONNECT 50000 175 CONNECT 52000 176 CONNECT 54000 177 CONNECT 56000 178 CONNECT 230400 180 CONNECT 28000 181 CONNECT 29333 182 CONNECT 30667 183 CONNECT 33333 184 CONNECT 34667 185 CONNECT 37333 186 CONNECT 38667 187 CONNECT 41333 188 CONNECT 42667 189 CONNECT 45333 190 CONNECT 46667 191 CONNECT 49333 192 CONNECT 50667 193 CONNECT 53333 194 CONNECT 54667 195 +MRR: 28000

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Short Form Long Form

196 +MRR: 29333 197 +MRR: 30667 198 +MRR: 33333 199 +MRR: 34667 200 +MRR: 37333 201 +MRR: 38667 202 +MRR: 41333 203 +MRR: 42667 204 +MRR: 45333 205 +MRR: 46667 206 +MRR: 49333 207 +MRR: 50667 208 +MRR: 53333 209 +MRR: 54667

Chapter 1 – AT Commands, S-Registers and Result Codes

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Chapter 2 – Fax Class1 Commands

Chapter 2 – Fax Class 1 Commands

Fax I/O Processing

The fax I/O interface supports asynchronous serial and parallel interfaces. The character format is 8 bit data, no parity, and 1 stop bit. Start and stop elements are removed from the transmit data and added to the receive data. Both transmit and receive data are buffered. Flow control using XON/XOFF or RTS/CTS is provided.

Unique control character strings are identified, filtered, or reinserted into the I/O data stream. These control characters and their resultant action are described below.

DTE-to-Modem Transmit Data Stream

Characters Detected Action Taken

<DLE><data> Delete <DLE><data> characters. <DLE><ETX> Recognize as a string terminator and take appropriate action. <DLE><DLE> Replace with single <DLE> character.

Modem-to-DTE Receive Data Stream

Characters Detected Action Taken

<DLE> Insert extra <DLE> ahead of <DLE>.

The modem also identifies the end of a frame by inserting <DLE><ETX> into the data stream after the FCS bytes.

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Fax Mode Selection

Fax Class 1 and Fax Class 1.0 commands are identified in Table 2-1.

Table 2-1. Fax Class 1 and Fax Class 1.0 Commands

Command/Parameter Function Applicable in

Fax Class 1

+FCLASS=<class> Select, read or test service class X X +FAA=<value> Auto answer enable - X +FAE=<value> Auto answer enable X X +FTS=<time> Stop transmission and pause X X +FRS=<time> Wait for silence X X +FTM=<mod> Transmit data with <mod> carrier X X +FRM=<mod> Receive data with <mod> carrier X X +FTH=<mod> Transmit HDLC data with <mod> carrier X X +FRH=<mod> Receive HDLC data with <mod> carrier X X +FAR=<off/on> Adaptive reception control - X +FCL=<time> Carrier loss timeout - X +FDD=<value> Double escape character replacement control - X +FIT=<time>, <action> DTE inactivity timeout - X +FPR=<rate> Fixed DTE Rate - X +FMI? Report manufacturer ID - X +FMM? Report model ID - X +FMR? Report revision ID - X +FLO Flow Control - X &K Local DTE-modem flow control (see Call

Control Section) A Answer X X D<string> Dial X X H Hangup (see Call Control Section) X X

X stands for Applicable. - stands for Not Applicable.

X X

Applicable in Fax Class 1.0

Fax Origination

Origination of fax calls is made using the ATD command. Upon completion of the dial function, a calling tone at 1100 Hz is transmitted, with a cadence of 0.5 seconds on and 3 seconds off. The modem automatically enters mode +FRH=3 and sends the CONNECT message to the DTE when FSK flags are detected from the remote.

Fax Answering

Answering of fax calls is identical to answering of data calls with the exception that the modem enters the fax handshaking mode instead of the data handshaking mode after going off-hook. If +FAE=0, the modem, after sending answer tone, automatically enters fax mode (+FTH=3), sends the CONNECT message to the DTE, and starts sending FSK flags. If +FAE=1, the modem determines whether the caller is a data modem or fax modem and sends the DATA or FAX result code, respectively, to the DTE.

Fax Control Transmission

Fax control transmission is initiated by the +FTH=<mod> command. After this command is issued, the modem generates the CONNECT message and transmits carrier in the modulation scheme specified by the parameter n. The modem then transmits HDLC flags for a minimum of 1 second. The modem continues to transmit the HDLC flags until it receives a character from the DTE. When characters are received from the DTE, the modem adds start and end flags, performs zero-bit insertion, generates FCS, and deletes <DLE><chr> character pairs before transmitting the characters to the remote fax machine. Each <DLE><DLE> sequence is transmitted as a single <DLE>. <DLE><ETX> is considered as the end of frame marker and is not transmitted. All data received from the DTE after <DLE><ETX> is ignored by the modem until the modem generates either the CONNECT, OK, or ERROR result code.

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Chapter 2 – Fax Class1 Commands

If no more data is in the transmit buffer and the final bit was a 1 (bit 4 of the second byte received from the DTE), the modem generates the OK result code and returns to the command mode. If the final bit was a 0, the modem generates the CONNECT message and waits for further data from the DTE while transmitting HDLC flags. If no more data is received before 5 seconds elapse, the modem drops carrier, goes on-hook, and generates the ERROR result code.

Fax Control Reception

Fax control reception is initiated using the AT+FRH=<mod> command. After this command is issued, the modem looks for carrier in the modulation scheme specified by the parameter n. If no carrier is detected before the period of time specified by register S7 expires, the modem generates the NO CARRIER message and returns to command mode.

If a carrier is detected that is not the one specified by the parameter n, the modem generates the +FCERROR message and returns to the command mode. If the specified carrier is detected, the modem generates the CONNECT message and enters the HDLC receive mode.

In HDLC receive mode, the modem receives HDLC frames from the remote fax machine, strips the flags, performs zero-bit deletion, performs error checking, and handles <DLE><chr> character pairs before passing the data to the DTE. The modem prefixes each <DLE> character with another <DLE> character before sending it to the DTE. After the last byte in the frame, the modem sends <DLE><ETX> to the DTE marking the end of the frame. The modem then generates the OK message if no errors were detected or the ERROR message if errors were detected (FCS is incorrect) and returns to command mode.

While in command mode, the modem continues to receive data in the selected modulation scheme, and sends the data after sending the CONNECT message to the DTE when the DTE reissues the +FRH command with the same parameter. If the DTE issues the +FRH command with a different parameter, the modem clears all buffers and proceeds as described previously.

If carrier is lost while in command mode and the DTE reissues the +FRH command with the same parameter, and there is no data in the buffer, the modem sends the ERROR result code to the DTE and returns to the command mode. If there is data in the buffer, the modem sends the next frame of buffered data to the DTE, followed by <DLE><ETX>, and either the ERROR result code if errors were detected or the OK result code if no errors were detected. The modem then returns to command mode.

The modem concludes an error is detected if carrier is lost for any period of time during or before the reception of a frame. If carrier is lost for a time period longer than the time specified by the register S10, the modem finishes delivering the data in the receive buffer (if any) to the DTE, sends <DLE><ETX>, generates the ERROR message, and returns to command mode. All subsequent data received from the remote is discarded.

If the modem detects a frame abort sequence (seven consecutive ones with no zero insertion) while it is waiting for a frame beginning flag (it was receiving HDLC flags), it will wait for the HDLC flags again until either carrier is lost or the DTE aborts the process by sending an abort character or by dropping DTR with &D2 in effect. If the frame abort sequence is detected while the modem is receiving a frame it finishes delivering the data in the receive buffer (if any) to the DTE, sends <DLE><ETX>, generates the ERROR message, and returns to command mode. The modem keeps looking for HDLC flags followed by more data from the remote, with the selected modulation scheme.

If the modem detects a receive buffer overflow condition, it concludes that there was an FCS error in that frame. The modem will receive more frames only if a starting flag is detected and there is room in the receive buffer. If a starting flag is detected and there is no room in the buffer, the modem discards all data in that frame.

If the modem receives any character from the DTE after the +FRH command (except flow control characters if software flow control is in effect), or if the modem detects a high-to-low transition of the DTR signal while &D1 is in effect, it sends <DLE><ETX> to the DTE, generates OK result code, and returns to command mode. The receive buffer is cleared and all data received from the remote is discarded. If the modem detects a DTR drop while &D2 is in effect, it goes on-hook, sends <DLE><ETX> to the DTE, generates OK result code, and returns to command mode. If the modem detects a DTR drop while &D3 is in effect, the modem performs a warm reset.

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Fax Data Transmission

Fax data transmission is initiated by the AT+FTM=<mod> command. After this command is issued, the modem generates the CONNECT message and transmits carrier in the modulation scheme specified by the parameter n. The modem then transmits constant 1 bits for a minimum of one second and continues to transmit constant 1 bits until it receives a character from the DTE.

When data is received from the DTE, the modem deletes start and stop bits and deletes all <DLE><chr> character pairs before transmitting the data to the remote. Each <DLE><DLE> sequence is transmitted as a single <DLE>. <DLE><ETX> is considered as the end of stream marker, and is not transmitted. All data received from the DTE after the <DLE><ETX> is ignored by the modem until the modem generates either the CONNECT, OK, or ERROR result code.

If no more data is in the transmit buffer, and the last transmitted character was not an ASCII NULL, the modem generates the OK result code and returns to the command mode. If the last character transmitted was an ASCII NULL, the modem generates the CONNECT message to the DTE and waits for further data from the DTE while transmitting NULLs to the remote. If more data is received before five seconds elapse, the modem continues to transmit the data as described in the previous paragraph. If five seconds elapse and no data is received from the DTE, the modem drops carrier, goes on-hook, and generates the ERROR result code.

Fax Data Reception

Fax data reception is initiated using the AT+FRM=<mod> command. After this command is issued, the modem looks for carrier in the modulation scheme specified by the parameter n. If no carrier is detected before the period of time specified by register S7 expires, the modem generates the NO CARRIER message and returns to command mode. If a V.21 carrier is detected when a high-speed carrier is expected, the modem generates the +FCERROR message and returns to the command mode. If the specified carrier is detected, the modem generates the CONNECT message and enters the data receive mode.

While in data receive mode, the modem receives data from the remote, adds start and stop bits, and handles <DLE><chr> character pairs before passing the data to the DTE. The modem prefixes each <DLE> character with another <DLE> character before sending it to the DTE.

If the modem detects a receive buffer overflow condition, it stops receiving from the remote until there is room in the receive buffer. The modem informs the DTE of the buffer overflow after it sends to the DTE the last character that was stored in the buffer before the overflow occurred.

If the modem receives any character from the DTE after the +FRM command (except flow control characters if software flow control is in effect), or if the modem detects a high-to-low transition of the DTR signal while &D1 is in effect, it sends <DLE><ETX> to the DTE, generates the OK result code, and returns to command mode. The receive buffer is cleared and all data received from the remote is discarded. If loss of DTR is detected while &D2 is in effect, the modem goes on-hook, sends <DLE><ETX> followed by OK result code to the DTE, and returns to command mode. If the modem detects a DTR drop while &D3 is in effect, the modem performs a warm reset.

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Commands and Parameters

Mode Entry Commands

+FCLASS=1 Select Facsimile Class 1 Mode

+FCLASS=1 selects the Fax Class 1 Mode. The Fax Class 1 Mode commands and responses described in this section are applicable when command +FCLASS=1 as shown in Table 2-1.

+FCLASS=1.0 - Select Facsimile Class 1.0 Mode

+FCLASS=1.0 selects the Fax Class 1.0. The Fax Class 1.0 Mode commands and responses described

in this section are applicable when command +FCLASS=1.0 as shown in Table 2-1.

Mode Commands

Command: +FAA Auto Answer Enable - Class 1.0

Description: This command enables or disables fax adaptive answer. This command

operates identically to the +FAE command. Defined Values: <value> Decimal number corresponding to the selected option. 0 Disable data /fax auto answer mode. (Default.) 1 Enable data /fax auto answer mode. The modem determines the calling

type and issues DATA result code (13) if the caller is a data modem or issues

FAX result code (15) if the caller is a fax modem.

Command: +FAE Auto Answer Enable - Class 1 and 1.0

Description: This command enables or disables fax adaptive answer. This command

operates identically to the +FAA command. Defined Values: <value> Decimal number corresponding to the selected option. 0 Disable data /fax auto answer mode. (Default.) 1 Enable data /fax auto answer mode. The modem determines the calling

type and issues DATA result code (13) if the caller is a data modem or issues

FAX result code (15) if the caller is a fax modem.

After a data (not fax) connection is achieved (indicated by the DATA result

code), the DTE must issue an ATO command to cause the modem to go on-

line.

Command: +FTS Transmit Silence

Description: This command causes the modem to terminate a transmission and wait for

<time> 10-ms intervals before responding with the OK result code. Defined Values: <time> Decimal number from 0 (default) to 255 that specifies the length of

time in 10-ms intervals to delay before responding with the OK result code

after terminating the session. Result Codes: OK Reported when transmission has been terminated for the specified

amount of time. ERROR <value> is invalid or this command is issued while the modem is on-

hook. Reporting Supported Range of Parameter Values: Command: +FTS=? Response: +FTS: <time> range Example: +FTS: 0-255.

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Command: +FRS Receive Silence

Description: This command causes the modem to listen and report an OK result code

when silence has been detected on the line for the specified period of time.

This command will terminate when the required period of silence is detected

or when the DTE sends the modem another character other than XON or

XOFF, which is discarded. In either event, the OK result code is returned. This command is aborted if any character is received from the DTE after

receipt of the command but before the time delay elapses. In this case, the

modem discards the aborting character and issues an OK result code. Defined Values: <time> Decimal number from 0 (default) to 255 which specifies the length of

time in 10-ms intervals to delay before responding with the OK result code

after detecting silence on the line. Result Codes: OK Reported when silence has been present on the line for the specified

amount of time or when the DTE sends the modem a character other than

XON or XOFF. ERROR <value> is invalid or this command is issued while the modem is on-

hook. Reporting Supported Range of Parameter Values: Command: +FRS=? Response: +FRS: <time> range Example: +FRS: 0-255

Command: +FTM Transmit Facsimile

Description: This command causes the modem to transmit data using the modulation

defined below. When a valid <mod> value is entered, the modem transmits

the proper training sequence in the selected mode, followed by constant 1 bits

until data is received from the DTE. The modem also returns the CONNECT

result code at the beginning of the training sequence. Defined Values: <mod> Decimal number corresponding to the selected modulation mode and

data rates shown in Table 2-2.

Table 2-2. Fax Class 1 and Fax Class 1.0 Modulation Modes and Rates

<mod> Modulation Training Modulation Mode and Rate

3 24 48 72 73 74 96 97 98

121 122 145 146

V.21 V.27 ter V.27 ter V.29 V.17 Long 7200 bps long V.17 Short 7200 bps short V.29 V.17 Long 9600 bps long V.17 Short 9600 bps short V.17 Long 12000 bps long V.17 Short 12000 bps short V.17 Long 14400 bps long V.17 Short 14400 bps short

Result Codes: CONNECT Reported when the modems begins the training sequence after

receipt of a valid <mod> value.

ERROR If the modem’s transmit buffer becomes empty and the last

transmitted character is NUL (00), the modem continues to transmit NULs until the DTE sends more data or five seconds elapses. After five seconds elapse with an empty transmit buffer, the modem will turn off the transmit carrier, return to the command state, and report the ERROR result code.

OK If the modem’s transmit buffer becomes empty and the last transmitted

character is not NUL, the modem will turn off the transmit carrier, return to the command state, and report the OK result code.

300 bps 2400 bps 4800 bps 7200 bps

9600 bps

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Reporting Current or Selected Values: Command: +FTM? Response: +FTM: <mod> Example: +FTM: 98 For V.17 9600 bps. Reporting Supported Range of Parameter Values: Command: +FTM=? Response: +FTM: (<mod> range) Example: +FTM: 3,24,48,72,73,74,96,97,98,121,122,145,146

Command: +FRM Receive Facsimile

Description: This command causes the modem to enter the receiver mode using the

modulation defined below.

Defined Values: <mod> Decimal number corresponding to the selected modulation mode and

data rates shown in Table 2-2. Reporting Current or Selected Values: Command: +FRM? Response: +FRM: <mod> Example: +FRM: 98 For V.17 9600 bps. Reporting Supported Range of Parameter Values: Command: +FRM=? Response: +FRM: (<mod> range) Example: +FRM: 3,24,48,72,73,74,96,97,98,121,122,145,146 Result Codes: CONNECT Reported when the selected carrier is detected. +FCERROR Reported if another carrier is detected and FAR=0; the modem

then returns to the command state. NO CARRIER Reported if loss-of-carrier is detected. OK Reported if the DTE sends any character to the modem other than XON or

XOFF while operating in configured flow control from the DTE; the modem

then returns to the command state.

Command: FTH Transmit Data with HDLC Framing

Description: This command causes the modem to transmit data using HDLC protocol and

the modulation defined below. Defined Values: <mod> Decimal number corresponding to the selected modulation mode and

data rates shown in Table 2-2. Result Codes: CONNECT Reported for either of two conditions:

1. At the beginning of transmission of the training pattern for the selected

modulation.

2. If the Final Frame bit is 0. OK Reported for either of two conditions:

1. If the Final Frame Bit is 1.

2. if the DTE sends only <DLE><ETX> (a null frame) while transmitting flags.

ERROR Reported if five seconds elapse from the time when the modem

reported the CONNECT result code without any additional data transmitted

from the DTE; the modem then turns off carrier and returns to the command

mode. Reporting Current or Selected Values: Command: +FTH? Response: +FTH: <mod> Example: +FTH: 98 For V.17 9600 bps. Reporting Supported Range of Parameter Values: Command: +FTH? Response: +FTH? Example: +FTH: 98 For V.17 9600 bps.

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Command: +FRH Receive Data with HDLC Framing

Description: This command causes the modem to receive frames using HDLC protocol

and the modulation defined below. An ERROR response code results if this

command is issued while the modem is on-hook. Defined Values: <mod> Decimal number corresponding to the selected modulation mode and

data rates shown in Table 2-2. Reporting Current or Selected Values: Command: +FRH? Response: +FRH: <mod> Example: +FRH: 98 For V.17 9600 bps. Reporting Supported Range of Parameter Values: Command: +FRH? Response: +FRH? Example: +FRH: 98 For V.17 9600 bps. Result Codes: CONNECT Reported for either of two conditions:

1. When the selected carrier is detected with an HDLC flag.

2. If the DTE sends another +FTH=<MOD> command after sending the result

code indicating frame reception is complete. +FCERROR Reported if a different carrier is detected and FAR=0. NO CARRIER Reported if loss of carrier is detected. OK Reported for either of two conditions:

1. If a frame was received correctly.

2. If the DTE sends any character other than XON or XOFF while the modem

is in the configured flow control. ERROR Reported if a frame was received in error.

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Service Class 1 Commands

Command: +FAR Adaptive Reception Control

Description: If Adaptive Reception is enabled, the modem adaptively detects the selected

message carrier or V.21 control messages. If the expected carrier is detected,

the modem operates as specified in the respective +FRM=<mod or

+FRH=<mod commands. If V.21 flag preamble is detected instead, the

modem issues a +FRH:3 intermediate result code, and then executes an

implied +FRH=3 command. Defined Values: <value> Decimal number corresponding to the selected option. 0 Disable Adaptive Reception. (Default.) 1 Enable Adaptive Reception. Reporting Current or Selected Values: Command: +FAR? Response: +FAR: <value Example: +FAR: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +FAR=? Response: +FAR: (<value> range ) Example: +FAR: (0,1)

Command: +FCL Carrier Loss Timeout

Description: This parameter allows the DTE to select the modem’s loss-of-carrier delay

between initial loss-of-carrier and qualified loss-of-carrier, when the modem

will give up and exit a receive mode. Intermediate (less than FCL timeout)

loss-of-carrier should be indicated by insertion of the SQ-BAD signal quality

indicator in the received data stream. In unframed receive modes, if the modem detects RTC as described in

Recommendation T.30 prior to initial loss of the high speed carrier, or if the

modem detects V.21 carrier after initial loss of high speed carrier, then the

modem immediately accepts the loss-of-carrier as qualified, without waiting for

the FCL timer to expire. In HDLC receive modes, if the modem detects HDLC abort prior to initial loss

of the high speed carrier, or if the modem detects V.21 carrier after initial loss

of high speed carrier, then the modem l immediately accepts the loss-of-

carrier as qualified, without waiting for the FCL timer to expire. Defined Values: <value> Decimal number representing the loss-of-carrier delay time in units of

100 ms. The range is 0 - 255. Reporting Current or Selected Values: Command: +FCL? Response: +FCL: <time Example: +FCS: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +FCL=? Response: +FCL: (time range) Example: +FCL: (0-255)

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Command: +FDD Double Escape Character Replacement

Description: This parameter conditions the use of the ˜DLE˜˜˜SUB˜ pair to encode

consecutive <1/0 €<1/0 in data. This may be used to prevent unbound

expansion of data that contains many <1/0 patterns. Defined Values: <value> Decimal number corresponding to the selected option. For modem

decode of <DLE><SUB>, the defined range are: 0 <DLE> <DLE> or discard (default and only) 1 <DLE> <DLE> (not supported) For modem encoding of <1/0> <1/0>the defined values are: 0 <DLE> <DLE> <DLE> <DLE> (default and only) 1 <DLE> <SUB> (not supported) Reporting Current or Selected Values: Command: +FDD? Response: +FDD: <value> Example: +FDD: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +FDD=? Response: +FDD: (<value> range) Example: +FDD: (0)

Command: +FIT DTE Inactivity Timeout

Description: This command specifies a DTE inactivity timeout value that allows the modem

to break away from an unsuccessful connection attempt at any stage of a

facsimile transfer. The DTE inactivity timer operates only while the modem is

off-hook. Defined Values: <time The <time parameter indicates the DTE inactivity timeout in seconds.

The value of 0 indicates that timeout is disabled (default). The required

timeout range is 1 to 255 seconds. The inactivity timer starts when the modem

has taken some action that requires DTE response. If the DTE does respond,

the modem resets the inactivity timer. Inactivity timer related events are listed

in Table 2-3. <action The <action parameter has two meanings. 0 Upon timeout, the modem will go on-hook, executing an implied ATH

command; then reset to +FCLASS 0. 1 Upon timeout, the DCE will only go on-hook. Reporting Current or Selected Values: Command: +FIT? Response: +FIT: <time ,action Example: +FIT: 0,0 For the default settings. Reporting Supported Range of Parameter Values: Command: +FIT? Response: +FIT: (<time> range), (<action> range) Example: +FIT: (0-255),(0-1)

Table 2-3. Inactivity Timer Start and Stop Events

On-line state Start timer event Stop timer event

Waiting for a command modem sends final result code DTE sends AT or “at” Waiting for transmit data modem sends CONNECT after +FTM or

+FTH command Waiting for transmit data modem sends <XON or sets CTS ON DTE sends data Waiting to deliver received data modem sends <XOFF after +FRM or +FRH

command Waiting to deliver received data DTE sets V.24 Ckt 133 OFF after +FRM or

+FRH command

DTE sends data

DTE sends <XON

DTE sets V.24 Ckt 133 ON

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Command: +FPR Fixed DTE Rate

Description: This numeric extended-format parameter specifies the data rate at which the

modem will accept commands during on-line operation. It may be used to select operation at rates at which the modem is not capable of automatically detecting the data rate being used by the DTE. Specifying a value of 0 disables the function and allows operation only at rates automatically detectable by the modem. The specified rate takes effect following the issuance of any result code(s) associated with the current command line.

The <rate> specified does not apply in Online Data State if Normal Mode

(Direct Mode) of operation is selected. Syntax: +FPR=<rate code> Defined Values: <rate code> Specifies the DTE-modem interface operation rate in bits/s with a

rate code. The available rate codes are: 0 Automatic detection (default) 1 2400 bits/s (executes +IPR=2400) 2 4800 bits/s (executes +IPR=4800) 4 9600 bits/s (executes +IPR=9600) 8 19200 bits/s (executes +IPR=19200) 10 38400 bits/s (executes +IPR=38400) 18 57400 bits/s (executes +IPR=57400) If unspecified or set to 0, automatic detection is selected and the character

format is also forced to autodetect, +ICF=0. If the rate specified is not supported by the modem, an ERROR result code

will be returned. Reporting Current or Selected Values: Command: +FPR? Response: <rate code> Example 1: 0 For automatic rate detection. Example 2: 18 For 57600 bits/s. Reporting Supported Range of Parameter Values: Command: +FPR=? Response: (<rate code> range) Example: (0,1,2,4,8,10,18)

Command: +FMI? Request Manufacturer Identification

Description This command causes the modem to report the modem product manufacturer. Syntax: +FMI? Typical Response: Multi-Tech OK

Command: +FMM? Request Model Identification

Description: This command causes the modem to report the modem product model. Syntax: +FMM? Typical Response: V90 OK

Command: +FMR? Request Revision Identification

Description: This command causes the modem to transmit one or more lines of information

text identifying the modem version, revision level, or date. Syntax: +FMR? Typical Response: V3.001-V90_2M_DLS OK

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Command: +FLO Flow Control

Description: This parameter allows the DTE to identify and select the type of flow control

used. Syntax: +FLO=<method> Defined Values: <method> Decimal number corresponding to the selected option. 0 XON/XOFF and RTS/CTS flow control turned off. 1 Use XON/XOFF flow control in either direction. 2 Use RTS for flow control of the modem by the DTE; use CTS for flow control

of the DTE by the modem. Reporting Current or Selected Values: Command: +FLO? Response: +FLO: <method> Example: +FLO: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +FLO=? Response: +FLO: (<method>range) Example: +FLO: (0-2) Result Codes: OK <method> = 0-2. ERROR Otherwise.

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Examples

Examples of calling (transmitting) and answering (receiving) one page using Fax Class 1 commands are shown in Table 2-4 and Table 2-5, respectively. The examples show the interchange between the DTE and the modem for various cases. Comments are included to explain how to handle various situations. Commands and responses are in upper case and comments are in lower case. All streams of data denoted by <..frame> are terminated by the <DLE><ETX> characters.

Table 2-4. Fax Class 1 Calling Sequence (Transmitting a Single Page)

DTE Commands Modem Responses Local Modem Action Remote Station Action Notes

AT+FCLASS=1 OK Set Class 1 ATDT<string>

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier AT+FRH=3

AT+FTS=8; +FTM=96

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier AT+FTM=96

AT+FTS=8; +FRH=3

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier AT+FRH=3

ATH0 OK hang up hang up

CONNECT <NSF frame> <DLE><ETX> OK

CONNECT <CFI frame data> <DLE><ETX> OK

CONNECT <DIS frame data> <DLE><ETX> OK

CONNECT

CONNECT <CFR frame data> <DLE><ETX> OK

CONNECT

CONNECT <MCF frame data> <DLE><ETX> OK

CONNECT

Dial and send CNG Look for V.21 Detect flags

Detect flags get CSI get FCS accept FCS

Detect flags get DIS get FCS accept FCS

send V.21 carrier send flags send TSI frame send FCS send flags send DCS frame send FCS, flags drop carrier

wait 80 ms send V.29 carrier

send TCF data drop carrier

detect carrier detect flags get CFR frame check FCS accept FCS

send V.29 carrier send page data drop carrier

wait 80 ms send V.21 carrier send flags send EOP frame send FCS drop carrier

detect carrier detect flags get MCF frame check FCS accept FCS

send V.21 carrier send flags send DNC frame send FCS drop carrier

Answer send CED, V.21 Send HDLC flags

Send NSF frame

send CSI frame

check FCS

send DIS frame

check FCS

detect carrier detect flags get TSI frame

get DCS frame

detect carrier

get TCF data

send V.21 carrier send flags get CRF frame send FCS

detect carrier receive page

detect carrier detect flags receives EOP

send V.21 carrier send flags get MCF frame send FCS

detect carrier detect flags receive DC|NC

AT+FRH=3 implied by dialing with +FCLASS=1.0

Frame status OK

DTE must detect final frame bit to anticipate loss of carrier

Final frame bit clear tells the modem to expect another frame. Final frame bit set tells the modem not to expect another frame

Final frame bit set. frame OK

final frame

Final frame bit set. frame OK

final frame

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Table 2-5. Fax Class 1 Answering Sequence (Receiving a Single Page)

DTE Commands Modem Responses Local Modem Action Remote Station Action Notes

AT+FCLASS=1 OK Set Class 1 RING<- detect ringing dials [,send CNG]

ATA

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier DTE did not check final

AT+FTM=96

AT+FRH=3

AT+FTM=96

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier AT+FRH=3

AT+FRH=3

AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier end of session ATH0 OK hang up

CONNECT

CONNECT <TSI frame data> <DLE><ETX> OK

CONNECT <DCS frame data> <DLE><ETX> OK

CONNECT <TCF data> <DLE><ETX> OK

CONNECT

CONNECT <page image data> <DLE><ETX> NO CARRIER

CONNECT <EOP frame data> <DLE><ETX> NO CARRIER

CONNECT

CONNECT <DCN frame data> <DLE><ETX> OK

off-hook, send CED, send V.21 carrier send flags send CSI frame send FCS send flags send DIS data send FCS and flags drop carrier

detect carrier detect flags receive TSI receive FCS accept FCS

receive DCS receive FCS accept FCS

detect carrier receive TCF detect loss-of-carrier

send V.21 carrier send flags get CRF frame send FCS drop carrier

detect carrier receive page detect loss-of-carrier

detect carrier detect flags receive EOP receive FCS accept FCS

send V.21 carrier send flags get MCF frame send FCS accept FCS

detect carrier detect flags receive DCN receive FCS accept FCS

get CED, detect carrier detect flags receive CSI get FCS get flags get DIS get flags

AT+FRH=3 implied by answering with +FCLASS=1.0. not final frame

final frame

send V.21 carrier send flags send TSI frame send FCS

send DCS frame send FCS

wait 75 ms send V.29 carrier send TCF data drop carrier

detect carrier detect flags receive CFR

send V.29 carrier send page data drop carrier

wait 75 ms send V.21 carrier send flags send EOP frame send FCS

detect carrier detect flags receive MCF frame

send V.21 carrier send flags send DCN frame send FCS

frame OK

final frame bit set

frame OK

frame bit and issued +FRH=3

final frame

frame OK

final frame

frame OK

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Chapter 3 – Fax Class 2 Commands

Fax Class 2 commands apply to the MT5656SMI only and are summarized in Table 3-1.

Table 3-1. Fax Class 2 Commands

Command Function

Service Class ID

+FCLASS= Service Class

Class 2 Action Commands

D Originate a Call A Answer a Call +FDT Data Transmission +FET=N Transmit Page Punctuation +FDR Begin or Continue Phase C Receive Data +FK Session Termination

Class 2 DCE Responses

+FCON Facsimile Connection Response +FDCS: Report Current Session +FDIS: Report Remote Identification +FCFR Indicate Confirmation to Receive +FTSI: Report the Transmit Station ID +FCSI: Report the Called Station ID +FPTS: Page Transfer Status +FET: Post Page Message Response +FHNG Call Termination with Status

Class 2 Session Parameters

+FMFR? Identify Manufacturer +FMDL? Identify Model +FREV? Identify Revision +FDCC= DCE Capabilities Parameters +FDIS= Current Sessions Parameters +FDCS= Current Session Results +FLID= Local ID String +FCR Capability to Receive +FPTS= Page Transfer Status +FCR= Capability to Receive +FAE Adaptive Answer +FBUF? Buffer Size (Read Only) +FPHCTO Phase C Time Out +FAXERR Fax Error Value +FBOR Phase C Data Bit Order

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Command and Syntax Guidelines

Mode Entry Commands

+FCLASS=2 - Select Facsimile Class 2 Mode

+FCLASS=2 selects the Fax Class 2 Mode (see Generic Modem Control).

DTE Commands

The ISO 646 character set (CCITT T.50 International Alphabet 5, American Standard Code for Information Interchange) is used for the issuance of commands and responses. Only the low-order 7 bits of each character are used for commands or parameters; the high order bit is ignored. Upper case characters are equivalent to lower case characters. For Phase C data transmission or reception, all 8 bits are needed.

DTE Command Lines

A command line is a string of characters sent from a DTE to the modem (DCE) while the modem is in a command state. A command line has a prefix, a body, and a terminator. Each command line (with the exception of the A/ command) must begin with the character sequence AT and must be terminated by a carriage return. Commands entered in upper case or lower case are accepted, but both the A and T must be of the same case, i.e., "AT" = ASCII 065, 084 or “at” = ASCII 097, 116. The body is a string of commands restricted to printable ASCII characters (032 - 126). Space characters (ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII 010) in the command string are ignored. The default terminator is the ASCII <CR> character. Characters that precede the AT prefix are ignored. The command line interpretation begins upon receipt of the carriage return character.

Facsimile Command Syntax

After the "AT" or "at" prefix, facsimile commands use extended syntax. Each command is preceded by the “+F” character and consists of single characters and a decimal parameter (if applicable) terminated by the semicolon “:” character (ASCII 059) or by the <CR> that terminated the command line. A missing decimal parameter is evaluated as 0.

For example, the command to instruct the modem to automatically answer a data or fax call and also enable reception is:

AT+FAE=0; +FCR 1 <CR>

Basic data mode and fax service class mode select commands are: AT+FCLASS=0 <CR> for Data Mode AT+FCLASS=1 <CR> for Service Class 1 Fax AT+FCLASS=1.0 <CR> for Service Class 1.0 Fax AT+FCLASS=2 <CR> for Service Class 2 Fax

In Class 2, the DCE makes and terminates calls, manages the communication session and

negotiates (T.30 protocol) and transports the image date to DTE. The T.4 protocol management of

image data, etc., is done by DTE.

The response to AT+FCLASS= 0<CR> in Data Mode or AT+FCLASS=2<CR> in Service Class 2 Fax is OK

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The service class may be set by the DTE from the choices available using the “+FCLASS=<VALUE>” command.

General Rules

1. +Fnnn commands must be entered completely, otherwise an ERROR response is sent.

2. All response messages are preceded and followed by <CR><LF>. Multiple response commands

(e.g., +FDIS: +FCSI: and +FDCS:) will, therefore, appear to a have a blank line between them.

3. Fax Class 2 commands can be separated by the “:” character. The “;” character can be omitted if desired. Non-data commands cannot be separated by the “;” which is allowed as a dial modifier.

4. All Class 2 commands are assumed to be the final command on a command line. Additional characters will be ignored.

5. An ERROR message will be generated if any of the following conditions occur:

a. A Class 1 command is received while in Class 2. b. A Class 2 command is received while in Class 1. c. A Class 1 or Class 2 action command is received while in data modem mode. d. A Class 2 read-only parameter is given the “=” form of a +F command (e.g., AT+FAXERR=5). e. A Class

Serial Port Speed and Flow Control

During fax mode, the DTE-DCE port speed is 19200 bps.

The DCE provides a speed buffer of 1024 bytes and provides the DC1/DC3 (XON/XOFF) or RTS/CTS method of controlling the data into the buffer. This flow control is controlled by the &K3 or &K4 command.

This method of data flow control is available only for DTE to DCE direction of data.

There is no provision for data flow control from DCE to DTE.

Data Stream Termination

The DCE exchanges streams of data with the DTE while executing data transfer commands. These data streams use the termination described in Section 3.2/ISO 2111.

The ASCII <DLE> character (016) is used as a special character to shield special characters. The <DLE><ETX> character pair (<106><003>) is used to mark the end of a stream. The following

patterns are used: any data...<DLE><ETX> end of stream any data...<DLE><DLE> single <DLE> in data any data...<DLE><any byte> delete <DLE><any byte>

DTE to DCE Streams

The DCE filters the data stream from the DTE, and removes all character pairs beginning with

<DLE>. The DCE recognizes <DLE><ETX> as the stream terminator. The DCE recognizes

<DLE><DLE> and reinserts a single <DLE> in its place.

The DTE must filter stream data to the DCE, and insert extra <DLE> characters ahead of data.

DCE to DTE Streams

The DTE must filter the data stream from the DCE, and remove all character pairs beginning with

<DLE>. The DTE must recognize <DLE><ETX> as the stream terminator. The DTE must recognize

<DLE><DLE> and reinsert a single <DLE> in its place.

The DCE filters stream data to the DTE, and inserts extra <DLE> characters ahead of data.

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Auto Answer

The DCE can answer as a data DCE or as a fax DCE. It can answer the call adaptively, i.e., it can determine whether the call is 'data' or 'fax'. The +FAA parameter controls this feature. Fax adaptive answer operates only when +FCLASS=0.

AT+FAA=1 ; Auto answer as a facsimile or a data modem depending on the call CONNECT XXXX ; DCE status response if data call +FCON ; DCE status response if fax call

Identification of T.30 Options

Group 3 devices negotiate session parameters in DIS, DCS, and DTC frames.

Session Status Reporting

The DCE provides reports to the DTE on the status of a session. The DCE provides the following status reports:

1. Connection and hang up status: +FCON +FHNG:<0-255>

2. Requested DIS session parameters +FDIS: <string> reports remote facsimile

capabilities.

Syntax: +FDIS: VR, BR, WD, LN, DF, EC, BF, ST

3. +FDCS: <string> reports the negotiated parameters

4. Phase C prompts:

XON, XOFF, DC2

5. Phase C base status reports: depending upon copy quality and related end-of page

status:

+FPTS: <1-5>

Procedure Interrupt Negotiation

CCITT allows a station to request a procedure interruption at the end of a page. This request is passed between stations by the PIP, PIN, and PRI-Q messages.

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Service Class 2 Identification and Selection

Three commands report identification and selection information. Each of these three commands cause the DCE to send a message to the DTE.

+FMFR? - Request Manufacturer Identification

The +FMFR? command causes the DCE to send a message identifying the DCE product manufacturer. The default message is: CONEXANT OK

+FMDL? - Identify Product Model

The +FMDL? command causes the DCE to send a message identifying the DCE product model.

+FREV? - Identify Product Revision

The +FREV? command causes the DCE to send a message identifying the DCE product model revision number. The message format is the same as the ATI3 message, e.g.: VX.X-F_A OK

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Service Class 2 Action Commands

These commands transfer data, and punctuate sessions. They also release specific T.30 messages. All action commands must be the last command on a command line as indicated by the terminating <CR>.

All action commands initiate processes. The modem will not accept other commands from the DTE until the modem issues a final result code (e.g., OK, CONNECT). The modem will abort the process if it receives any character before the final result code is issued.

Command: ATD Originate a Call

Syntax: ATD....<CR>

The DCE can support a DTE command to originate a call using the ATD

command (see Data Commands). If this command is unsuccessful, the DCE reports an appropriate failure or error type result code such as NO CARRIER, NO DIAL TONE, or BUSY (see S-Parameters).

If this call is successful, the typical DCE response is: ATDnn..nn (go off-hook, dial, get CED) +FCON (DCE detects flags) [+FCSI:<remote ID string>] +FDCS:<T.30 subparameter string> OK

The DCE dials, detects call progress, and generates the CNG tone. It then waits for a DIS frame. On detection of the first Phase B preamble (V.21 ch. 2 modulated by 300 bps HDLC flags), it reports the “+FCON” message to the DTE. The DCE then switches to 19200 bps.

The DCE generates a DCS frame based on the received DIS frame and on the previously set +FDIS parameter. A +FDT command from the DTE releases the DCE to transmit that DCS frame.

The DCE reports the initial received T.30 negotiation messages, including the DIS frame and the optional CSI ID string. The +FDIS: report is followed by the OK final result code.

Command: ATA - Answer a Call

The DCE can support a DTE command to answer an incoming call using the ATA command (see Data Commands).

The DTE may issue an Answer command in response to an incoming ring.

If the Answer command is unsuccessful, the DCE will report an appropriate failure or error type result code, such as NO CARRIER (see S-Parameters).

Manual Call Answer

If this call is successful, the typical DCE response (answer and receive) is:

+FCON [+FTSI:<remote ID string>] +FDCS:<T.30 subparameter string> OK (DTE should issue +FDR command here)

Upon receipt of an Answer command from the DTE, the DCE answers and generates the CED tone. The DCE then generates a DIS frame (derived from the +FDIS parameter) and hunts for the first T.30 negotiation frames. Upon detection of the first Phase B preamble (V.21 ch 2 modulated by 300 bps HDLC flags), it reports the “+FCON” message to the DTE.

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The DTE should report the initial received T.30 negotiation messages, including the DCS frame. The +FDCS: report will be followed by the OK final result code.

Automatic Answer

The modem provides for automatic answering of incoming calls. If configured for automatic answer, the modem answers an incoming call in compliance with T.30, and reports the same messages as described for manual answer.

Connection as a Data Modem

If configured to do so by the +FAA parameter, the DCE will adaptively answer as a facsimile DCE or as a data DCE. If the DCE answers as a data DCE, it resets the +FCLASS parameter to 0 and issues the appropriate final result code (e.g., CONNECT, or NO CARRIER) to the DTE.

Command: +FDT Data Transmission

Syntax: +FDT <CR> The +FDT command prefixes Phase C data transmission. When the DCE is ready to accept Phase C data, it issues the negotiation responses and the CONNECT result code to the DTE.

In Phase B, the +FDT command releases the DCE to proceed with negotiation, and releases the DCS message to the remote station. In Phase C, the +FDT command resumes transmission after the end of a prior transmit data stream.

Initiate Page Transmission

Phase B DCE polled response: [+FCSI:<remote ID string>] - if new CSI received [+FDIS:<subparameters from remote station>] - if new DIS received +FDCS:<T.30 subparameter string> CONNECT <XON> - when ready for data After placing a call, or after finishing a document exchange, the DTE may command the DCE to re-enter T.30 Phase B to attempt to negotiate a document transmission.

Continue a Page

CONNECT <XON> The DTE may issue more than one +FDT command for a given page, so that different files may be concatenated together. These files must have the same format.

Phase C Data Framing

Phase C data must be presented to the DCE in stream mode. The DCE expects Phase C data to follow until it detects <DLE><ETX> termination characters. The DCE will filter the stream.

The DCE will acknowledge the end of the data by returning the OK result code to the DTE.

If there is data underrun before the next +FDT or +FET= command, the DCE will zero-fill the pad as per T.4 until the Phase C timeout (+FPHCTO) is reached, or until more data is received. The DCE appends an RTC pattern to the transmit data after an +FET= command is received from the DTE.

Phase C Data Format

The Phase C data will be of the format specified by the negotiated T.30 DCS frame.

The DCE will use the negotiated minimum Scan Time parameter from the DCS frame, and insert sufficient fill bits to pad each line to the minimum scan time. This is reported in the +FDCS:ST subparameter.

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If the DCE finds more than one consecutive EOL in Phase C data (e.g., RTC), it will send only one EOL.

1. Phase C data must conform to T.4 specifications.

2. The DTE need not include a final RTC, since the DCE will append an RTC in response to an FET=

command.

3. Some facsimile machines may treat two EOLs as an RTC.

<CAN> - Escape from Transmission

The DCE may request the DTE to halt Phase C transmission, by sending a cancel <CAN> character (024) to the DTE. In this case, the DTE should terminate Phase C transmission, issue <CAN>, and wait for the OK response code from the DCE.

Table 3-2. T.30 Session Subparameter Codes

Label Function Value Description

VR Vertical Resolution 0 Normal, 98 lpi 1 Fine, 196 lpi BR Bit Rate (See Note 1) +FDCS (originate) +FDIS (answer) 0 2400 bps/V.27 ter V.27 ter (2400 only) 1 4800 bps/V.27 ter V.27 ter 2 7200 bps/V.29 V.29, V.27 ter 3 9600 bps /V.29 or V.17 V.29, V.27 ter 4 12000 bps/V.33 or V.17 V.17, V.33, V.29, V.27 ter 5 14400 bps/V.33 or V.17 V.17, V.33, V.29, V.27 ter WD Page Width 0 1728 pixels in 215 mm 1 2048 pixels in 255 mm 2 2432 pixels in 303 mm 3* 1216 pixels in 151 mm 4* 4864 pixels in 107 mm LN Page Length 0 A4, 297 mm 1 B4, 364 mm 2 unlimited length DF

Data Compression Format

0 1-D modified Huffman 1* 2-D modified Read 2* 2-D uncompressed mode 3* 2-D modified modified Read EC Error Correction 0 Disable ECM (Annex A/T.30) 1* Enable ECM, 64 bytes/frame 2* Enable ECM, 256 bytes/frame BF Binary File Transfer 0 Disable BFT 1* Enable BFT ST Scan Time/Line VR = normal VR = fine 0 0 ms 0 ms 1 5 ms 5 ms 2 10 ms 5 ms 3 10 ms 10 ms 4 20 ms 10 ms 5 20 ms 20 ms 6 40 ms 20 ms 7 40 ms 40 ms

Notes: 1. CCITT T.30 does not provide for the answering station to specify all speeds exactly using the DIS frame. Implementation of some BR codes (e.g., code 2) by an answering DCE is manufacturer specific.

* Not supported.

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Command: +FET Transmit Page Punctuation

Description: This command is used to punctuate page and document transmission after

one or more +FDT commands. This command generates T.30 Post Page Messages selected by the <ppm> code.

The +FET=<ppm> command indicates that the current page is complete; no

more data will be appended to it. The value indicates whether there are any additional pages are to be sent and, if so, whether there is a change in any of the document parameters.

The DTE can command the DCE to generate PRI-Q messages with the

+FET=<ppm> command using ppm codes 4-6.

This command must be sent within the time out specified by +FPHCTO after

sending Phase C data, or else the DCE will end the page and document transmission. If the Phase C timeout is reached, the DCE sends an EOP post page message and terminates the session.

The remote facsimile station should respond to the post page message with a

post page response. The DCE will report this using the +FPTS:<ppr>

response. Syntax: +FET=<ppm>[,<pc>,<bc>,<fc>] DCE response: +FPTS:<ppr> - when receive from remote OK

End a Page

The +FET= command causes the DCE to append an RTC (6 EOL) pattern as needed and enter Phase D by sending the selected T.30 Post Page message. The +FET=1 (EOM) command signals the remote station that the next document will have a new DCS negotiated; this causes the session to re-enter Phase B.

Table 3-3. T.30 Post Page Message Codes

ppm Code Mnemonic Description

0 [PPS-]MPS Another page next, same document 1 [PPS-]EOM Another document next 2 [PPS-]EOP No more pages or documents 3 PPS-NULL Another partial page next 4 [PPS-]PRI-MPS Another page, procedure interrupt 5 [PPS-]PRI-EOM Another doc., procedure interrupt 6 [PPS-]PRI-EOP All done, procedure interrupt =8+ppm Post Page Message (ppm code)

Table 3-4. T.30 Post Page Response Messages

ppr Code Mnemonic Description

1 MCF Page good 2 RTN Page bad; retrain requested 3 RTP Page good; retrain requested 4 PIN Page bad; interrupt requested 5 PIP Page good; interrupt requested

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Command: +FDR Begin or Continue Phase C Receive Data

Description: The +FDR command initiates transition to Phase C data reception. This can

occur after answering, dialing, a document is received, or a page is received. The DCE reports the negotiated T.30 parameters, with the remote ID

information if available. When the DCE is ready to commence data transfer, it

issues a CONNECT response code. If the DCE cannot resume data transfer

because there is no more data, it responds OK. When the DTE is ready to

accept data, it issues an <DC2> character (018) to the DCE. If the DTE issues an <XOFF> character to the DCE for flow control, the DCE

signals the DTE when its buffers are empty by sending a <DLE><DC2>

(<016><018>) character pair. When the DCE delivers the last byte of a page, the DCE reports the Page

Transfer Status via the +FPTS:<ppr> response. After a Page Transfer Status Report, the DCE reports the post page message

from the remote facsimile station via the +FET:<ppm> response which signals

the intentions of the remote station. The DCE holds the post page response message to the remote facsimile

station (MCF, etc.), represented in the +FPTS parameter until the next +FDR

command. The DTE may modify the +FPTS parameter before issuing the

+FDR command which releases that message. The DTE must issue a +FDR

command to release Post Page Messages. Syntax: +FDR <CR> Default value: 3 seconds in some places

Initiate Document Reception

The +FDR command may be issued in Phase B after an answer command, or in Phase B after a previous document. The DCE response in stream mode is: +FCFR when CFR sent [+FTSI:<remote ID string>] if new TSI received +FDCS:<T.30 subparameter string>] if new DCS CONNECT (<DC2> needed from DTE here) <Phase C data stream> <DLE><ETX> +FPTS:<ppr>, <lc> [,<blc>, <cblc>] +FET:<ppm> OK (DTE must issue +FDR command to release post page response)

Continue Document Reception

The DTE may issue a +FDR command in Phase D, which releases the post page message, and indicates readiness to receive another page after receipt of a Multipage (+FET:0) or PPS-NULL (+FET:3) message. The DCE response will be: CONNECT (<DC2> needed from DTE here) <Phase C data stream) <DLE><ETX> +FPTS:<ppr>, <lc> [,<blc>, <cblc>] +FET:<ppm> OK (DTE must issue +FDR command to release post page response) If done receiving: +FHNG: <hangup cause code> OK Continue page reception

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Phase C Data Framing

Phase C data may be presented to the DTE in stream mode. The DCE will transfer a stream of data to the DTE, followed by the <DLE><ETX> stream termination characters.

The DCE will filter the stream as described in Voice Commands -- <DLE> Shielded Codes Sent to the Modem (DCE).

Phase C Data Format

The received data format is negotiated under T.30 reported by the +FDCS:VR,BR,WD,LN,DF,EC,BF,ST response.

The DCE will delete the terminating RTC (6 EOLs) patterns.

<CAN> - Escape from Reception

From the +FDR command until the end of Phase D Date, the DCE is in a data transfer state, and will not respond to DTE command characters. The DCE will respond to three ASCII control characters: <DC1> (017) and <DC3> (019) flow control characters, and cancel <CAN> (024).

Upon receipt of the <CAN> character, the DCE will terminate the reporting of received data by sending trailing <DLE><ETX> characters to the DTE, and will then execute an implied +FK command in order to conduct an orderly disconnection.

Command: +FK Session Termination

Description: The +FK command causes the DCE to terminate the session in an orderly

manner. In particular, the DCE will send a DCN message at the next

opportunity and hang up. At the end of the termination process, the DCE will

report the +FHNG response with result code. This operation can be invoked by using the cancel <CAN> character during

Phase C data reception (see prior section). The DCE will wait until the current page completes, unless the reception is of

unlimited length; in that case, the DCE may halt reception and terminate the

session at any time. Syntax: +FK

Command: +FCIG Set Polling ID

Description: This command allows setting the Local Polling ID string used in a CIG frame.

The syntax of this command is identical to +FLID. Write syntax: +FCIG="<local ID string>" Valid value: 20-character ASCII string Default value: Empty

Command: +FLPL Indicate a Document for Polling

Description: This command allows setting up an answering modem to know that it has a

document available for polling. This allows a calling modem to receive this fax

from the answerer. Syntax: AT+FLPL=? 0,1 OK AT+FLPL=1 OK AT+FLPL? 1

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Command: +FSPL Enable Polling

Description: This command allows setting up an originating modem to be able to request

to receive a document from a polled station. Syntax:

0,1 OK AT+FSPL=1 OK AT+FSPL? 1

Table 3-5. Hang Up Status Codes

AT+FSPL=?

Code Cause Description 0-9 Call Placement and Termination

0 Normal and proper end of connection 1 Ring Detect without successful handshake 2 Call aborted, from +FK or AN 3 No Loop Current

10-19 Transmit Phase A & Miscellaneous Errors

10 Unspecified Phase A error 11 No Answer (T.30 T1 timeout) 20-39 Transmit Phase B Hangup Codes 20 Unspecified Transmit Phase B error 21 Remote cannot receive or send 22 COMREC error in transmit Phase B 23 COMREC invalid command received 24 RSPEC error 25 DCS sent three times without response 26 DIS/DTC received 3 times; DCS not recognized 27 Failure to train at 2400 bps or +FMINSP value 28 RSPREC invalid response received 40-49 Transmit Phase C Hangup Codes 40 Unspecified Transmit Phase C error 43 DTE to DCE data underflow 50-69 Transmit Phase D Hangup Codes 50 Unspecified Transmit Phase D error 51 RSPREC error 52 No response to MPS repeated 3 times 53 Invalid response to MPS 54 No response to EOP repeated 3 times 55 Invalid response to EOP 56 No response to EOM repeated 3 times 57 Invalid response to EOM 58 Unable to continue after PIN or PIP 70-89 Receive Phase B Hangup Codes 70 Unspecified Receive Phase B error 71 RSPREC error 72 COMREC error 73 T.30 T2 timeout, expected page not received 74 T.30 T1 timeout after EOM received 90-99 Receive Phase C Hangup Codes 90 Unspecified Receive Phase C error 91 Missing EOL after 5 seconds 92 Unused code 93 DCE to DTE buffer overflow 94 Bad CRC or frame (ECM or BFT modes) 100-119 Receive Phase D Hangup Codes 100 Unspecified Receive Phase D errors 101 RSPREC invalid response received 102 COMREC invalid response received 103 Unable to continue after PIN or PIP

120-255 Reserved Codes Note: Some codes are not implemented.

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Service Class 2 DCE Responses

The DCE sends information responses to the DTE as a facsimile session proceeds. They indicate the state of the facsimile session and convey needed information. These messages are solicited messages generated in execution of DTE action commands.

The DCE precedes and follows the information responses with <CR><LF>. The DCE provides the on-line status of several session parameters when they are available during T.30

handshaking. These include the remote ID string and the DIS/DCS parameters. These responses report the T.30 session parameter frames.

Command: +FCON Facsimile Connection Response

+FCON indicates connection with a fax machine. It is released by detection of HDLC flags in the first received frame. +FCON is generated in response to an Originate or Answer command.

Command: +FDCS: Report Current Session Capabilities

Description: +FDCS:<string> reports the negotiated parameters. Phase C data will be

formatted as described by the subparameters. This message may be

generated in execution of +FDT or +FDR commands before the CONNECT

result code if new DCS frames are generated or received. Syntax: +FDCS:VR,BR,WD,LN,DF,EC,BF,ST

Command: +FDIS: Report Remote Station Capabilities

Description: +FDIS:<string> reports remote facsimile station capabilities and intentions.

The parameters are provided in ASCII notation. This message is generated in

execution of Originate, Answer, +FDT, or +FDR commands. Syntax: +FDIS:VR,BR,WD,LN,DF,EC,BF,ST

Command: +FCFR Indicate Confirmation to Receive

Description: The DCE sends a +FCFR response to the DTE upon reception of an

acceptable TCF training burst and a valid DCS signal from the remote

machine. This indicates that the DCE will receive Phase C data after the

remote station receives the local DCE's CFR message. The +FCFR message

is generated in execution of a +FDR command. Syntax: +FCFR

Command: +FTSI: Report the Transmit Station ID

Description: This response reports the received transmit station ID string, if any. This

message is generated in execution of Originate, Answer, +FDT, or +FDR

commands. Syntax: +FTSI: “<TSI ID string>” Transmit Station ID

Command: +FCSI: Report the Called Station ID

Description: This response reports the received called station ID string, if any. This

message is generated in execution of Originate, Answer, +FDT, or +FDR

commands. Syntax: +FCSI: “<CSI ID string>” Called Station ID

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Command: +FPTS: Receive Page Transfer Status

Description: The +FPTS:<ppr> is generated by the DCE at the end of Phase C data

reception in execution of a +FDR command. The <ppr> is generated by the DCE; it depends on the DCE capabilities at T.4

error checking. The receiving DCE will count the lines. These values are; <lc> = line count <blc = bad line count <cblc> = <consecutive bad line count A receiving DTE may inspect <ppr> and write a modified value into the +FPTS

parameter. The DCE will hold the corresponding Post Page Response

message until released by a +FDR command from the DTE. Syntax: +FPTS:<ppr>, <lc> [,<blc>, <cblc>]

Command: +FET: Post Page Message Response

Description: The +FET:<post page message> response is generated by a receiving DCE

after the end of Phase C reception on receipt of the post-page message from

the transmitting station. The +FET:<ppm> response is generated in execution

of a +FDR command. The <ppm> codes respond to the T.30 post page

messages. Syntax: +FET:<ppm>

Command: +FPTS: Transmit Page Transfer Status

Description: The +FPTS: response reports a <ppr> number representing the copy quality

and related post-page message responses received from the remote DCE. The +FPTS:<ppr> response is generated in execution of a +FET=<ppm>

command. Syntax: +FPTS:<ppr>

Command: +FHNG: Call Termination with Status

Description: +FHNG indicates that the call has been terminated. The hangup cause is

reported and stored in the +FAXERR parameter for later inspection. +FHNG:<hsc> is a possible intermediate result code to any DTE action

command. It is always followed by the OK final result code. Upon termination of a call, the DCE determines the cause of termination and

reports it as part of the FHNG:<hsc> response. It also stores this <hsc> code

in the +FAXERR parameter for later inspection. The hangup values are organized according to the phases of the facsimile

transaction as defined by T.30. In the Figure A/T.30 flow charts, there are

decision boxes labeled “Command Received?"; this is referred to as

COMREC in the table. Similarly, decision boxes labeled `Response

Received?' are referred to as RSPREC in the table. A COMREC error or

RSPREC error indicates that one of two events occurred: 1) a DCN

(disconnect) signal was received, or 2) an FCS error was detected and the

incoming signal was still present after 3 seconds. The table values are in decimal notation. Leading zero characters are

optional. Syntax: +FHNG:<hangup status code>

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Command: +FCIG: Report the Polled Station ID

Description: This response reports the received transmit station ID string, if any. This

message is generated in execution of Originate, Answer, +FDT, or +FDR

commands. Syntax: +FCIG: “< ID string>” Polled Station ID

Command: +FDTC: Report the Polled Station Capabilities

Description: If the answerer has a document to poll, it would be communicated to the

originator in bit 9 of the DIS frame. The originating station may elect to

transmit a fax, and later, send SIG and DTC frames to pick up the polled

document. The answering station would report the incoming DTC frame via

the +FDTC: response message after command mode is canceled with the

AT+FDR command. Syntax: +FDTC: “< string>” Polled Station Capabilities

Command: +FPOLL Indicate Polling Request

Description: This message is sent to the DTE if the received DIS message indicates that

the remote station has a document to poll (by bit 9 in the DIS) and polling has

been enabled with the AT+FSPL command. The DTE may then decide to

receive rather than transmit. Syntax: +FPOLL:

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Service Class 2 Parameters

All Service Class 2 parameters can be read, written, and tested for range of legal values by the DCE. The general syntax is described in the Voice Commands Overview section.

Group 3 FAX devices negotiate session parameters in DIS, DCS, and DTC frames. The following parameters are provided to condition the facsimile DCE for the capabilities it will offer and to report the session settings negotiated.

The three primary T.30 session parameters are +FDCC, +FDIS and +FDCS. They are compound parameters.

Figure 3-2. T.30 Session Parameter Relationships

Command: +FDCC DCE Capabilities Parameters

Description: +FDCC allows the DTE to sense and constrain the capabilities of the facsimile

DCE from the choices defined in CCITT T.30 Table 2. When +FDCC is

modified by the DTE, the DCE copies +FDCC into +FDIS. Write syntax: +FDCC=VR,BR,WD,LN,DF,ED,BF,ST Valid values: See Table 3-2. Default values: 0,3,0,2,0,0,0,0 (9600 bps fax models) or 0,5,0,2,0,0,0,0 (14400 bps fax

models)

Command: +FDIS Current Sessions Capabilities Parameters

Description: The +FDIS parameter allows the DTE to sense and constrain the capabilities

used for the current session. The DCE uses +FDIS to generate DIS or DTC

messages directly, and uses +FDIS and received DIS messages to generate

DCS messages. The DCE initializes the +FDIS parameter from the +FDCC parameter on

initialization, when +FDCC is written, and at the end of a session. Write syntax: +FDIS=VR,BR,WD,LN,DF,EC,BF,ST Valid values: See Table 3-2. Default values: 0,3,0,2,0,0,0,0 (9600 bps fax models) or 0,5,0,2,0,0,0,0 (14400 bps fax

models)

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Command: +FDCS Current Session Results Parameters

Description: The +FDCS parameter is loaded with the negotiated T.30 parameters for the

current session. A transmitting DCE generates DCS; a receiving DCE gets

DCS from the remote station. The DTE may read this parameter. The +FDCS parameter is initialized 0,0,0,0,0,0,0,0 upon initialization and at

the beginning of a session. If the DTE issues a +FDCS? command in the

initial state, the DCE reports: <CR><LF>0,0,0,0,0,0,0,0<CR><LF> The contents of +FDCS are spontaneously reported during execution of +FDR

or +FDT commands by the +FDCS:VR,BR,WD,LN,BF,EC,BF,ST response

using the same compound parameter format. Several commands and responses reference T.30 session negotiated

parameters. These are described by a set of common subparameters. The +FDCC, +FDIS, and +FDCS compound parameters use these session

parameters (On writes, unspecified subparameters are unchanged.) The +FDIS:, +FDCS:, and +FDTC: session report responses use these

subparameters. For test response, ranges of values are reported for each subparameter

enclosed in parentheses characters. For example, a DCE response to

+FDCC=? could report: <CRLF> (0,1), (0-5), (0-3), (0-2), (0-2), (0-2), (0), (0-7) <CRLF> (14400 fax

models) Read syntax: +FDCS? DCE response: +FDCS=VR,BR,WD,LN,DF,EC,BF,ST or +FDCS= Valid values: See Table 3-2. Default values: 0,0,0,0,0,0,0,0 Example: +FDIS=0,5,0,2,0,0,0,1 = VR = 0 98 dpi vertical resolution, BR = 5 14400 bit/s WD = 0 1728 pixels, LN = 2 unlimited length DF = 0 1-D modified Huffman coding, EC = 0 no ECM, BF = 0 no BFT, ST = 1 5 ms scan time.

Command: +FLID= Local ID String

Description: If FLID is not a null string, it generates a TSI or CSI frame. Table 3/T.30

includes digits 0-9, “+” and space. If the DCE supports use of Table 3/T.30 only, the response to a +FLID=?

command is “(20) (32, 43, 48-57).” If the DCE supports printable ASCII <, the

response is: “(20) (32-127)<CRLF>.” The first “(20)” represents string length:

the second (character values) field reports supported string values.

1. The string is saved in RAM.

2. Non-numeric characters are not filtered out.

3. The string is right justified.

Write syntax: +FLID="<local ID string>" Valid value: 20-character ASCII string Default value: Empty

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Command: +FCR Capability to Receive

Description: +FCR=0 indicates that the DCE will not receive message data. This can be

used when the DTE has insufficient storage. The DCE can send and can be

polled for a file. +FCR is sampled in CCITT T.30 Phase A and Phase D. Write syntax: +FCR=<value> Valid values: 0 or 1 Default value: 0

Command: +FPTS= Page Transfer Status

Description: The +FPTS parameter contains a value representing the post page response,

including copy quality and related end-of-page status. These values

correspond to post page response messages defined in T.30. The receiving

DCE sets this parameter after it receives a page of Phase C data. The

transmitting DCE sets this parameter with the status reported by the receiving

station. The DTE may inspect or modify this parameter. The set of <ppr> values is defined in Table 3-4. These values are also

reported in the +FPTS response to the +FDR command. Write Syntax: +FPTS=<ppr> Valid values: 1, 2, 3, 4, 5 Default value: 0

Command: +FCQ Copy Quality Checking

Description: This parameter controls Copy Quality checking by a receiving facsimile DCE. The DCE returns +FCQ=0 which indicates the DCE does no quality checking.

The DCE will generate Copy Quality OK (MCF) responses to complete pages,

and set +FPTS=1. Write syntax: +FCQ=<value> Valid values: 0 Default value: 0

Command: +FPHCTO DTE Phase C Response Time-out

Description: The +FPHCTO command determines how long the DCE will wait for a

command after reaching the end of data when transmitting in Phase C. When

this time-out is reached, the DCE assumes there are no more pages and no

documents to send. It then sends the T.30 EOP response to the remote

device. Write syntax: +FPHCTO=<value> Valid values: 0 - 255, 100 millisecond units. Default value: 30

Command: +FAXERR T.30 Session Error Report

Description: his read-only parameter indicates the cause of the hangup. Table 3-5 shows

the valid values for this parameter as well as the meaning of the each value.

+FAXERR is set by the DCE at the conclusion of a fax session. The DCE

resets +FAXERR to 0 at the beginning of Phase A off-hook time. Read syntax: +FAXERR= <table value>, read only Valid values: 0 - 255

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Command: +FBOR Data Bit Order

Description: This parameter controls the mapping between PSTN facsimile data and the

DTE-DCE link. There are two choices: Direct: The first bit transferred to each byte on the DTE-DCE link is the

first bit transferred on the PSTN data carrier.

Reversed: The last bit transferred of each byte on the DTE-DCE link is

the first bit transferred on the PSTN data carrier. There are two data types to control: This command controls Phase C data (T.4 encoded data) transferred

during execution of +FDT or +FDR commands. The following two codes are supported: +FBOR=0 or 2 Selects direct bit order for Phase C data. +FBOR=1 or 3 Selects reversed bit order for Phase C data. This parameter does not affect the bit order of control characters generated by

the DCE. Write syntax: +FBOR=<value> Valid values: 0, 1, 2, or 3 Default value: 0

Command: +FAA Answer Parameter

Description: Fax adaptive answer operates only when +FCLASS=0. Class 2 adaptive answer is implemented as follows: First, a data mode handshake is attempted. If the DCE has been configured

for automode detection (using the +MS command), the DCE may try several

protocols before terminating attempts to make a data mode connection. This

can take as long as 6-8 seconds. If the data mode connection attempt fails, a facsimile Class 2 connection is

assumed. When a connection is made as a result of the adaptive answer, the

DCE issues the DATA or FAX result code before the CONNECT or +FCON

message to inform the DTE of the connection type. After making a Class 2

connection, the DCE stays on-line rather than going into the command mode

as with a Class 1 connection. Write syntax: +FAA=<value> Valid values: 0 or 1 Default value: 0 +FAA=0 Constrains the DCE to answer as set by +FCLASS.

+FAA=1 Indicates that the DCE can answer and automatically determine

whether to answer as a Class 2 facsimile DCE or as a data modem. If the DCE automatically switches, it modifies FCLASS appropriately.

Command: +FBUF? Buffer Size

Description: The +FBUF parameter allows the DTE to determine the characteristics of the

DCE's data buffer. Data buffers are used for flow control. Use of the reported

values allow the DTE to transfer data without provoking XOFF. Read syntax: +FBUF? DCE response syntax: <bs>, <xoft>, <xont>, <bc> where: <bs> = total buffer size <xoft> = XOFF threshold <xont> = XON threshold <bc> = current buffer byte count Example: +FBUF? 512, 506, 500, 0

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Example Sessions

Table 3-6 and Table 3-7 show the typical command and responses for sending and receiving two pages, respectively.

Table 3-6. Send Two Pages, 1-D, No Errors

DTE Command DCE Response Local DTE Action Remote Station Action

AT+CLASS=2 OK Set Class 2 X AT+FLID="<local ID>" OK Set local ID AT<dial string>

+FCON [+FCSI:"<csi>"] +FDIS: <dis codes> OK

AT+FDT

<1st page data>

<DLE><ETX> AT+FET=0

AT+FDT

<2nd page data> <DLE><ETX> AT+FET=2

+FDCS:<DCS codes> CONNECT <XON>

+FPTS:1 OK CONNECT <XON>

+FPTS:1 +FHNG:0 OK

Off-hook, dial Send CNG Detect flags [Get CSI] Get DIS

[Send TSI] Send DCS Send TCF Get CFR Send carrier

Send page data

Send RTC Get MPS Get MCF

Send carrier

Send page data

Send RTC Send EOP Get MCF Send DCN Hang up

Answer, Send [CED] V.21 flags [CSI] DIS

[Get TSI] Get DCS Get TCF Send CFR Receive carrier

Receive page data

Get RTC Get MPS Send MCF

Receive carrier

Receive page data

Get RTC Get EOP Send MCF Get DCN Hang up

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Table 3-7. Receive Two Pages, 1-D Data, No Errors

DTE Command DCE Response Local DTE Action Remote Station Action

AT+FCR=1 OK Enable reception AT+FLID="<local ID>" OK Set local ID RING Detect ring Dials[, Send CNG] ATA

+FCON [+FTSI:"<tsi>"] +FDCS:<dcs codes> OK

AT+FDR

<DC2>

AT+FDR

<DC2>

AT+FDR

+FCFR [+FDCS:"<dcs codes>] CONNECT

<page data stream> <DLE><ETX> +FPTS:1, <lc> +FET:0 OK

CONNECT

<page data stream> <DLE><ETX> +FPTS:1, <lc> +FET:2 OK

+FHNG:0 OK

Off-hook Send CED Send CSI Send DIS Detect flags [Get TSI] Get DCS Begin TCF receive Accept TCF Send CFR

Get page carrier Get page data

Detect RTC

Get MPS

Send MCF Get page carrier Get page data

Detect RTC

Get EOP

Send MCF Get DCN

Get CED Get CSI Get DIS Send V.21 flags [Send TSI] Send DCS Start TCF Finish TCF Get CFR

Send pager carrier Send page data

Send RTC Drop carrier Send MPS

Get MCF Send page carrier Send page data

Send RTC Drop carrier Send EOP

Get MCF Send DCN

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Chapter 4 – Voice Commands

Voice Commands Overview

Voice commands are identified in Table 4-1.

Table 4-1. Voice Commands

Command Function

Configuration

+FCLASS Set Mode +VCID Caller ID (CID) +VNH Automatic Hang-up control +FMI? Manufacturer Identification +FMM? Product Identification +FMR? Version, Revision, etc. +FLO Flow Control

Voice +VIP Voice Initialize All Parameters +VRX Start modem Receive (Record) +VTS Voice Tone Send (Send single frequency or DTMF) +VTX Start modem Transmit (Playback) +VGR Voice Gain Receive (Record Gain) +VGT Voice Gain Transmit (Playback Volume) +VIT Voice Inactivity Timer (DTE/Modem) +VLS Analog Source/Destination Selection +VRA Ringback Goes Away Timer +VRN Ringback Never Appeared Timer +VSD Silence Detection (QUIET & SILENCE) +VSM Compression Method Selection +VTD Beep Tone Duration Timer +VDR Distinctive Ring +VDT Control Tone Cadence Reporting +VPR Select DTE/modem Interface Rate (Turn off autobaud)

Chapter 4 – Voice Commands

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Chapter 4 – Voice Commands

<DLE> Shielded Event Codes Sent to the DTE

Table 4-2 lists the supported <DLE> shielded codes sent to the DTE in the expression <DLE><code>. The number in parenthesis in the second column corresponds to the T.50 equivalent.

Table 4-2. Supported <DLE> Shielded Codes Sent to the DTE

Code T.50 Equivalent Event Report Description

<DLE> (1/0) Two contiguous <DLE><DLE> codes indicate a single <DLE> in the

data stream <SUB> (1/10) <DLE><DLE> in the data stream <ETX> (0/3) End Data State

X (5/8) Packet Header for the “Complex Event Detection Report”

. (2/14) Packet Terminator for the “Complex Event Detection Report”

/ (2/15) Start of DTMF tone shielding ~ (7/15) DTMF transitions to off R (5/2) Ring 1 (3/1) DTMF 1 2 (3/2) DTMF 2 3 (3/3) DTMF 3 4 (3/4) DTMF 4 5 (3/5) DTMF 5 6 (3/6) DTMF 6 7 (3/7) DTMF 7 8 (3/8) DTMF 8 9 (3/9) DTMF 9 0 (3/0) DTMF 0 A (4/1) Extended Keypad DTMF A B (4/2) Extended Keypad DTMF B C (4/3) Extended Keypad DTMF C D (4/4) Extended Keypad DTMF D

* (2/10) Extended Keypad DTMF E # (2/3) Extended Keypad DTMF F o (6/15) Receive Buffer Overrun

c (6/3) Facsimile Calling e (6/5) Data Calling h (6/8) Line Current Break (local phone goes on-hook) H (4/8) Line Current Detected (local phone goes off-hook)

s (7/3) “Presumed Hangup”(SILENCE) Time-out q (7/1) “Presumed End of Message” (QUIET) Time-out

J (4/10) SIT Signal

l (6/12) Loop Current Interruption

r (7/2) Ringing Tone b (6/2) BUSY d (6/4) DIAL TONE u (7/5) Transmit Buffer Underrun p (7/0) Line voltage increase P (5/0) Line voltage decrease (extension pickup) a (6/1) Facsimile or Data Answer

f (6/6) Data Answer

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Chapter 4 – Voice Commands

<DLE> Shielded Codes Sent to the Modem (DCE)

Table 4-3 lists the supported <DLE> shielded codes sent to the modem in the expression <DLE><code>. The number in parenthesis in the second column corresponds to the T.50 equivalent.

Table 4-3. Supported <DLE> Shielded Codes Sent to the Modem (DCE)

Code Code Simple Action Command Description

<DLE> (1/0) Two contiguous <DLE><DLE> codes indicate a single <DLE>

in the data stream ("Immediate Command" or "Stream Command")

u (7/5) [Action Numbers 0 and 3] Increase the volume or gain by one

unit ("Immediate Command")

d (6/4) [Action Numbers 1 and 4] Decrease the volume or gain by one

unit ("Immediate Command")

p (7/0) [Action Number 9] Pause

r (7/2) [Action Number 10] Resume

<ETX> (0/3) [Action Number 11] End voice Transmit State ("Stream

Command")

<CAN> (1/8) [Action Number 12] Clear transmit buffer of voice data

("Immediate Command")

! (2/1) [Action Number 15] Receive abort ("Immediate Command")

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Chapter 4 – Voice Commands

Voice Configuration Commands

Command: +FCLASS=8 Select Voice Mode

+FCLASS=8 selects the Voice Mode. The Voice Mode commands and responses described in this section are applicable when command +FCLASS=8. (See the Generic Modem Control section for the definition of the FCLASS command.)

Command: +VNH Automatic Hang-up Control

This command enables or disables automatic hangups. Syntax: +VNH=<hook> Defined Values: <hook> Decimal number corresponds to the selected option (Table 2-4).

0 The modem enables automatic hangups as is normal in other modes.

1 The modem disables automatic hangups usually found in the other

non-Voice Modes.

2 The modem disables automatic hangups in the other non-Voice

Modes. The modem performs only a “logical” hangup (returns to OK result code).

Table 4-4. +VNH Command Behavior

Command Response

Command No Carrier

Present

+VNH=0 Y Y Y Y +VNH=1 N Y Y Y +VNH=2 N N N Y

Notes:

Y= will hang-up; N= will not hang-up. How +VNH is reset:

DTE uses +VNH command to change setting. DTE issues another +FCLASS mode change without issuing another +VNH. A hang-up event occurs (see this table).

DTE issues +VIP command.

ATH ATZ DTR & D2

Reporting Current or Selected Values: Command: +VNH? Response: <hook> Example: 0 For the default setting. Reporting Supported Range of Parameter Values: Command: +VNH=? Response: (<hook> range) Example: (0-2) Result Codes: OK <hook> = 0-2. ERROR Otherwise.

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