Telenetics Global Premier 56 User Manual

Global Premier 56 Modem

User’s Guide

0049-2500-001 Rev B

The products and programs described in this User’s Guide are licensed products of Telenetics
Corporation. This User’s Guide contains proprietary information protected by copyright, and this
User’s Guide and all accompanying hardware and documentation are copyrighted.

Telenetics Corporation does not warrant that the hardware will work properly in all
environments and applications, and makes no warranty and representation, either implied or
expressed, with respect to the quality, performance, merchantability, or fitness for a particular
purpose.

Information in this User’s Guide is subject to change without notice and does not represent a
commitment on the part of Telenetics Corporation. Telenetics Corporation assumes no
responsibility for any inaccuracies that may be contained in this User’s Guide.

Telenetics Corporation makes no commitment to update or keep current the information in this
User’s Guide, and reserves the right to make changes to this User’s Guide and/or product
without notice.

No part of this manual may be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying, recording, or information storage and retrieval systems,
for any purpose other than the purchaser's personal use, without the express written permission
of Telenetics Corporation.

 Copyright 2004 Telenetics Corporation.
25111 Arctic Ocean
Lake Forest, California 92630
Tel: [phone]
Fax: [phone]
Web site: www.telenetics.com

FCC Requirements

This device complies with Part 15 Class B of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.

This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 Class B of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of
the following measures:

 Reorient or relocate the receiving antenna.

 Increase the separation between the equipment and the receiver.

 Connect the equipment to an outlet on a circuit other than the one to which the receiver is

connected.

 Consult the dealer or an experienced radio/TV technician for help.

If none of these actions resolves the problem, consult your distributor or an experienced
radio/television technician for additional suggestions.

Additionally, Section 15.838, paragraph d), of the FCC Rules and Regulations states: “Where
special accessories, such as shielded cables, are required in order to meet FCC regulations,
shielded cables must be used with this equipment. Operation with non-approved equipment or
unshielded cables is likely to result in interference to radio and TV reception. The user is
cautioned that changes and modifications to this equipment without the approval of the
manufacturer could void the user’s authority to operate this equipment.

Department of Canada Statement

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.

Cet appareil numerique de la classe A respecte toutes les exigences du Reglement sur le materiel
brouilleur du Canada.

Page iii

FCC Part 68 Statement

This equipment complies with the Federal Communications Commission’s (FCC) Rules and Regulations
47 CFR Part 68 and the Administrative Council on Terminal Attachments (ACTA) adopted technical
criteria TIA/EIA/IS-968, Telecommunications – Telephone Terminal Equipment – Technical
Requirements for Connection of Terminal Equipment To the Telephone Network, July 2001. On the
plastic enclosure of this equipment is a label that contains the ACTA Registration number. You must,
upon request, provide this information to your telephone company.

This equipment uses USOCs RJ11 connector.

A telephone cord and modular plug compliant with TIA/EIA/IS-968 are provided with this equipment.
This equipment is designed to be connected to the telephone network or premises wiring using a
compatible modular jack, which is Part 68 compliant. See installation instructions for details.

The REN is useful to determine the quantity of devices you may connect to your telephone line and still
have all those devices ring when your telephone number is called. In most, but not all areas, the sum of
the REN's of all devices connected to one line should not exceed five (5.0). To be certain of the number
of devices you may connect to your line, as determined by the REN, you should contact your local
telephone company to determine the maximum REN for your calling area. (NOTE: REN are associated
with loop-start and ground-start ports. Do not use for E&M or digital ports).

If your telephone equipment causes harm to the telephone network, the Telephone Company may
discontinue your service temporarily. If possible, they will notify you in advance. But if advance notice is
not practical, you will be notified as soon as possible. You will be informed of your right to file a
complaint with the FCC.

Your telephone company may make changes in its facilities, equipment, operations or procedures that
could affect the proper functioning of your equipment. If they do, you will be notified in advance to give
you an opportunity to maintain uninterrupted telephone service.

If you experience trouble with this telephone equipment, please contact Telenetics Corporation, 25111
Arctic Ocean, Lake Forest, CA 92630, Phone [phone] for information on obtaining service or
repairs. The telephone company may ask that you disconnect this equipment from the network until the
problem has been corrected or until you are sure that the equipment is not malfunctioning.

Please note: No user serviceable parts contains in this equipment.

This equipment may not be used on coin service provided by the telephone company. Connection to party
lines is subject to state tariffs.

The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or
other electronic device, including fax machines, to send any message unless such message clearly
contains in a margin at the top or bottom of each transmitted page or on the first page of the
Transmission, the date and time it is sent and an identification of the business or other entity, or other
individual sending the message and the telephone number of the sending machine or such business, other
entity, or individual. (The telephone number provided may not be a 900 number or any other number for
which charges exceeds local or long-distance transmission charges.)

Page iv

Contents

CHAPTER 1 INTRODUCTION................................................................................................................................1

FEATURES..................................................................................................................................................................1

CHAPTER 2 INSTALLATION .................................................................................................................................3

UNPACKING YOUR MODEM .......................................................................................................................................3

ADDITIONAL ITEMS YOU NEED .................................................................................................................................4

INSTALLING YOUR MODEM .......................................................................................................................................4

INSTALLING THE DRIVER ...........................................................................................................................................6

Windows XP.........................................................................................................................................................6

Windows 2000......................................................................................................................................................6

Windows ME ........................................................................................................................................................7

Windows 98 or 95 ................................................................................................................................................7

LEDS.........................................................................................................................................................................8

MODEM OPERATION ..................................................................................................................................................8

CALL ANSWER TESTING ............................................................................................................................................9

CALL ORIGINATING TESTING.....................................................................................................................................9

CHAPTER 3 USING THE MODEM’S SECURITY FEATURES .......................................................................11

GETTING STARTED ..................................................................................................................................................11

Enabling Security...............................................................................................................................................11

Entering Superuser Mode ..................................................................................................................................11

PASSWORD PROTECTION..........................................................................................................................................12

Enabling Password Protection ..........................................................................................................................12

The Password Protection Process .....................................................................................................................13

SECURITY CALLBACK..............................................................................................................................................13

Enabling Security Callback ...............................................................................................................................14

The Security Callback Process ..........................................................................................................................14

REMOTE CONFIGURATION .......................................................................................................................................15

PERFORMING MISCELLANEOUS ACTIVITIES.............................................................................................................16

Changing the Security, Superuser, and Remote Configuration Password ........................................................16

Changing the Default User Passwords..............................................................................................................16

Viewing Security Status......................................................................................................................................17

CHAPTER 4 USING THE MODEM’S AUTO-CONNECT FEATURE .............................................................19

STORING TELEPHONE NUMBERS..............................................................................................................................19

CONFIGURING THE $DL TIMEOUT ...........................................................................................................................20

ENABLING THE AUTO-CONNECT FEATURE ..............................................................................................................20

VIEWING THE CURRENT $DL SETTING ....................................................................................................................20

CHAPTER 5 UPGRADING THE MODEM FIRMWARE ..................................................................................21

APPENDIX A AT COMMANDS.............................................................................................................................23

SYNTAX AND PROCEDURES .....................................................................................................................................23

Alphabet .............................................................................................................................................................23

DTE Commands Lines .......................................................................................................................................23

Command Line General Format........................................................................................................................24

Command Line Editing ......................................................................................................................................24

Command Line Echo..........................................................................................................................................24

Repeating a Command Line...............................................................................................................................25

Page v

Types of DTE Commands...................................................................................................................................25

Basic Syntax Commands ....................................................................................................................................25

Basic Syntax Command Format.........................................................................................................................25

S Parameters......................................................................................................................................................26

Extended Syntax Commands ..............................................................................................................................27

Command Naming Rules....................................................................................................................................27

Values.................................................................................................................................................................27

Action Commands ..............................................................................................................................................29

Parameter Commands .......................................................................................................................................30

Additional Syntax Rules .....................................................................................................................................32

Issuing Commands.............................................................................................................................................32

Executing Commands.........................................................................................................................................32

Aborting Commands ..........................................................................................................................................33

Handling of Invalid Numbers and S-Parameter Values ....................................................................................33

Modem Responses..............................................................................................................................................33

Responses...........................................................................................................................................................34

Extended Syntax Result Codes ...........................................................................................................................35

+<name>: <compound_value>Information Text Formats for Test Commands ..............................................36

DATA COMMAND SET..............................................................................................................................................37

Command Guidelines.........................................................................................................................................37

Escape Code Sequence ......................................................................................................................................37

Data Commands ................................................................................................................................................37

Generic Modem Control ....................................................................................................................................37

DTE-Modem Interface Commands ....................................................................................................................48

Call Control .......................................................................................................................................................60

Modulation Control Commands ........................................................................................................................75

Error Control Command....................................................................................................................................80

3.2.6 Data Compression Commands ............................................................................................................86

V.8/V.8bis Commands........................................................................................................................................89

Synchronous Access Mode Commands..............................................................................................................91

Diagnostic Commands .......................................................................................................................................94

Compatibility Commands.................................................................................................................................103

FastConnect Commands ..................................................................................................................................104

V.92 +P and –Q Commands ............................................................................................................................105

S-Parameters....................................................................................................................................................110

FACTORY DEFAULTS....................................................................................................................................111

S-PARAMETER DEFINITIONS ......................................................................................................................113

Cellular Commands .........................................................................................................................................125

Cellular Phone Drivers....................................................................................................................................126

Cellular Commands .........................................................................................................................................126

Operation .........................................................................................................................................................127

Result Codes.....................................................................................................................................................131

FAX CLASS 1 AND FAX CLASS 1.0 COMMANDS .....................................................................................................136

Fax I/O Processing ..........................................................................................................................................136

DTE-to-Modem Transmit Data Stream............................................................................................................136

Modem-to-DTE Receive Data Stream..............................................................................................................136

Fax Mode Selection..........................................................................................................................................136

Fax Origination ...............................................................................................................................................137

Fax Answering .................................................................................................................................................138

Fax Control Transmission ...............................................................................................................................138

Fax Control Reception.....................................................................................................................................138

Fax Data Transmission....................................................................................................................................140

Fax Data Reception .........................................................................................................................................140

Commands and Parameters.............................................................................................................................141

Mode Entry Commands.............................................................................................................................................141

Page vi

Mode Commands .............................................................................................................................................142

Service Class 1 Parameters .............................................................................................................................147

Examples..........................................................................................................................................................151

FAX CLASS 2 COMMANDS .....................................................................................................................................154

Command and Syntax Guidelines ....................................................................................................................155

Mode Entry Commands....................................................................................................................................155

DTE Commands...............................................................................................................................................155

Serial Port Speed and Flow Control................................................................................................................157

Auto Answer.....................................................................................................................................................158

Identification of T.30 Options ..........................................................................................................................158

Session Status Reporting..................................................................................................................................158

Procedure Interrupt Negotiation .....................................................................................................................159

Service Class 2 Identification and Selection....................................................................................................159

+FMFR? - Request Manufacturer Identification.............................................................................................159

+FMDL? - Identify Product Model .................................................................................................................159

+FREV? - Identify Product Revision ...............................................................................................................159

Service Class 2 Action Commands...................................................................................................................160

ATD - Originate a Call ....................................................................................................................................160

ATA - Answer a Call ........................................................................................................................................160

+FDT - Data Transmission .............................................................................................................................161

+FET - Transmit Page Punctuation ................................................................................................................164

+FDR - Begin or Continue Phase C Receive Data..........................................................................................166

+FK - Session Termination..............................................................................................................................168

+FCIG - Set Polling ID ...................................................................................................................................168

+FLPL - Indicate a Document for Polling ......................................................................................................168

+FSPL - Enable Polling ..................................................................................................................................168

Service Class 2 DCE Responses ......................................................................................................................170

+FCON - Facsimile Connection Response......................................................................................................170

+FDCS: - Report Current Session Capabilities ..............................................................................................170

+FDIS: - Report Remote Station Capabilities.................................................................................................170

+FCFR - Indicate Confirmation to Receive.....................................................................................................170

+FTSI: - Report the Transmit Station ID.........................................................................................................171

+FCSI: - Report the Called Station ID............................................................................................................171

+FPTS: - Receive Page Transfer Status ..........................................................................................................171

+FET: - Post Page Message Response............................................................................................................171

+FPTS: - Transmit Page Transfer Status........................................................................................................172

+FHNG: - Call Termination with Status .........................................................................................................172

+FCIG: - Report the Polled Station ID ...........................................................................................................172

+FDTC: - Report the Polled Station Capabilities ...........................................................................................172

+FPOLL - Indicate Polling Request................................................................................................................173

Service Class 2 Parameters .............................................................................................................................173

+FDCC - DCE Capabilities Parameters.........................................................................................................173

+FDIS - Current Sessions Capabilities Parameters........................................................................................173

+FDCS - Current Session Results Parameters................................................................................................173

+FLID= - Local ID String...............................................................................................................................174

+FCR - Capability to Receive..........................................................................................................................175

+FPTS= - Page Transfer Status ......................................................................................................................175

+FCQ - Copy Quality Checking ......................................................................................................................176

+FPHCTO - DTE Phase C Response Time-out...............................................................................................176

+FAXERR - T.30 Session Error Report...........................................................................................................176

+FBOR - Data Bit Order.................................................................................................................................176

+FAA - Answer Parameter ..............................................................................................................................177

+FBUF? - Buffer Size......................................................................................................................................177

Example Sessions .............................................................................................................................................178

VOICE COMMANDS ................................................................................................................................................180

Page vii

Voice Commands Overview .............................................................................................................................180

<DLE> Shielded Event Codes Sent to the DTE ..............................................................................................181

<DLE> Shielded Codes Sent to the Modem (DCE).........................................................................................182

Voice Commands .............................................................................................................................................182

Configuration Commands................................................................................................................................182

Voice Commands .............................................................................................................................................183

Speakerphone Commands................................................................................................................................196

APPENDIX B LIMITED PRODUCT WARRANTY ..........................................................................................199

APPENDIX C RETURN MERCHANDISE AUTHORIZATION (RMA) PROCEDURE ..............................200

Page viii

Chapter 1

Introduction

he Telenetics Global Premier 56 is an external data/fax modem that delivers outstanding
performance, transmitting data at the highest rates available today. The Global Premier 56

T

offers both synchronous and asynchronous data support, with throughput up to 230.4 kbps.
The Global Premier 56 incorporates advanced technology that enhances operation on less-than­ideal transmission lines. The Global Premier 56 also offers security features ideal for personal
and corporate applications, the Global Premier 56 easily handles tasks such as remote LAN
access, telecommuting, remote file transfer, access to the Internet, and any other applications that
require fast, reliable transmission speeds

Features

 2-wire dial or leased line

 ITU-V.92 capabilities

 Compatible with ITU V.34, V.32bis, V.32, V.29, V.27ter, V.23, V.22bis, V.21, and V.17

 Maximum throughput may be up to 230.4KBPS using data compression

 Supports industry-standard AT commands

 Supports V.42 and MNP 2-4 error correction and V.42bis and MNP5 data compression

 Security feature supports password verification and callback security

 Remote configuration

 Synchronous with V.25bis dialing capabilities

 Supports dumb-mode operation

Page 1

NOTES

Introduction

Page 2

Chapter 2

Installation

Unpacking Your Modem

Your Global Premier 56 modem package includes the following items (see Figure 1):

 One Telenetics Global Premier 56 modem

 An RJ-11 telephone cable

 An inline power supply (+12 Vdc, 800 ma)

 A power cord

 A CD containing the modem drivers and this User’s Guide

Figure 1. Global Premier 56 Modem Package

Page 3

Installation

Additional Items You Need

To install the Global Premier 56 mode, you need the following additional items:

 A personal computer (PC)

 A standard wall-mounted telephone jack located within 6 feet of your computer

 A telephone for originating or answering calls with your Global Premier 56

 A shielded serial cable with a 25-pin male connector for connecting to your Global Premier

56. The connector on the other end of the cable should match the requirements of your
computer or Data Terminal Equipment (DTE).

For asynchronous operation: Be sure the connector includes pins 2-8 and 20.

For synchronous operation: Be sure the connector includes pins 2-8, 15, 17, and 20.

Note: If you use fax software, be sure it supports Class 1 fax operation.

Installing Your Modem

The following procedure describes how to install your Global Premier 56 modem. You perform
these procedures using the connectors and jacks on the back of your Global Premier 56 modem
(see Figure 2 on page 5).

1. Turn off your computer.

2. Turn the power switch OFF on the back of your Global Premier 56 modem.

3. Connect one end of the appropriately configured cable to your computer. Connect the other

end of the cable to the COMPUTER connector on the back of your Global Premier 56
modem.

4. Connect either end of the supplied RJ-11 cable to a telephone wall jack. Connect the other

end of the cable to the WALL jack on the back of your Global Premier 56 modem.

5. Plug the 2-prong end of the supplied power cord to the POWER connector on the back of

your Global Premier 56 modem. Use the latch at the top of the power cord to secure this

Page 4

Installation

connection. Plug the other end of the power cord into a surge-protected power strip or wall
outlet.

6. To use a standard telephone with the modem, use a telephone cable to connect your

telephone to the PHONE jack on the back of your Global Premier 56 modem. You can then
use the line for voice calls when you are not using the modem.

7. Use the Power switch on the back to turn on your Global Premier 56 modem.

8. Proceed to “Installing the Driver ” on the next page.

WALL Jack

PHONE

Jack

COMPUTER

Connector

POWER

Connector

Figure 2. Global Premier 56 Modem Back Panel

Page 5

POWER

Switch

Installation

Installing the Driver

After you install your Global Premier 56, use the appropriate procedure to install the modem
driver. The driver is supplied on the CD that came with your Global Premier 56 modem.

Windows XP

If your computer contains the Microsoft Windows XP operating system, use the following
procedure to install the modem driver.

1. Windows detects your Global Premier 56 modem automatically.

2. In your computer’s CD-ROM drive, insert the supplied driver CD.

3. Click Install the software automatically [Recommended] if it’s not selected and click

Next.

4. If a window tells you that the software you are installing for this hardware has not passed

Windows Logo testing, click Continue Anyway. Windows installs the modem driver.

5. When the Completing the Found New Hardware Wizard appears, click Finish to complete

the driver-installation procedure.

Windows 2000

If your computer contains the Microsoft Windows 2000 operating system, use the following
procedure to install the modem driver.

1. Windows detects your Global Premier 56 modem automatically.

2. In your computer’s CD-ROM drive, insert the supplied driver CD.

3. Click Search for a suitable driver for my device [recommended] if it’s not selected and

click Next.

4. Under Optional Search Locations, check CD-ROM drives if it is not checked and click

Next. The Found New Hardware Wizard finds the driver for your modem.

5. Click Next to start the driver installation.

6. If a window tells you that the software you are installing for this hardware has not passed

Windows Logo testing, click Yes to continue the installation. Windows installs the modem
driver.

Page 6

Installation

7. When the Completing the Found New Hardware Wizard appears, click Finish to complete

the driver-installation procedure.

Windows ME

If your computer contains the Microsoft Windows ME operating system, use the following
procedure to install the modem driver.

1. Windows detects your Global Premier 56 modem automatically.

2. When the Found New Hardware Wizard recognizes your Global Premier 56 modem, select

Specify the location of the driver [Advanced].

3. In your computer’s CD-ROM drive, insert the supplied driver CD.

4. Click Next to search for the driver.

5. Select Search for the best driver for your device (Recommended).

6. Check Specify a location option and type the drive letter that corresponds to your

computer’s CD-ROM drive (for example, D:\).

7. Click Next to continue. Windows locates the driver for your modem.

8. Click Next to start the driver installation.

9. When a window informs you that Windows has finished installing the new hardware device,

click Finish to complete the driver-installation procedure.

Windows 98 or 95

If your computer contains the Microsoft Windows 98 or 95 operating system, use the following
procedure to install the modem driver.

1. Windows detects your Global Premier 56 modem automatically.

2. In your computer’s CD-ROM drive, insert the supplied driver CD.

3. Click Next.

4. Select the Search for the best driver for your device. [Recommended] and click Next to

continue.

5. Check CD-ROM drive and click Next. Windows locates the driver for your modem.

6. Click Next to start the driver installation.

Page 7

Installation

7. When a window informs you that Windows has finished installing the new hardware device,

click Finish to complete the driver-installation procedure.

LEDs

The Global Premier 56 modem provides eight LED indicators. Table 2-6 lists the modem LED
indicators.

Table 2-6. LEDs Indicating Modem Control Signals

LED DTE Signal

PWR
DTR
DCD

RD
TD

OH
RTS
CTS

ON = Modem is receiving power
Data Terminal Ready
Data Carrier Detect
Received Data
Transmitted Data
Off Hook
Request To Send
Clear To Send

Modem Operation

By default, the Global Premier 56 modem is set up to not auto-answer incoming calls. If you
want the modem to answer calls automatically, set the S0 register to a value other than its default
value of zero. For example, issuing the AT command ATS0=1 configures the modem to auto­answer calls after the first ring. These commands are typed from your computer or DTE
keyboard using terminal-emulation software such as HyperTerminal. For more information about
configuring your modem to auto-answer calls, refer to the S0 register on page 113.

If you change the auto-answer parameter, the new setting remains in effect until your modem is
powered-off. The next time your modem is powered-up, auto-answer is disabled again. To keep
auto-answer enabled each time the modem is powered-up, use the AT&W command to save
your changes in the modem’s nonvolatile memory. For more information about using this
command to store AT commands in nonvolatile memory, refer to the &W command on page 44.

Page 8

Installation

Call Answer Testing

After powering-on the Global Premier 56 modem, use the following procedure to test the
modem’s ability to answer a call.

1. Configure your Global Premier 56 modem to auto-answer incoming calls, as described under

“Modem Operation” on page 8.

2. Use a telephone to call the Global Premier 56 modem. Listen to the call to verify that the

Global Premier 56 modem answers the call with its answer tone and performs its
handshaking sequence in an attempt to make a data connection. Hang up the handset of the
telephone that originated the call.

3. Use another modem to call the Global Premier 56 modem. Verify that the Global Premier 56

modem answers the call, makes a data connection, and turns on the OH and DCD LEDs.

Call Originating Testing

Use the following procedure to test the modem’s ability to place a call.

1. Using terminal-emulation software such as HyperTerminal, issue the AT command

ATD<your number> where <your number> is the telephone number your modem is
connected to. For example, if your modem is connected to the line 555-1212, type
ATD5551212.

2. You should hear the modem originate the call followed by a busy signal (since the modem is

dialing its own number). In addition, a BUSY result code should appear on the computer or
DTE monitor.

If you do not hear the modem placing the call, use the ATL and ATM commands to adjust the
volume and status of the modem speaker. For more information about these commands, refer to
pages 64 and 64, respectively.

Note: If you try to establish a V.90 or V.92 connection, be sure the remote modem also
supports V.90 or V.92. Otherwise, you will not be able to establish the connection.

Page 9

NOTES

Installation

Page 10

Chapter 3

Using the Modem’s Security Features

Your Premier 56 modem supports the following security features:

 Password protection  provides protection against unauthorized dial-up access. See “Password

Protection,” below.

 Security callback  lets your Premier 56 modem automatically dial a preconfigured telephone

number after answering a call, holding the line for one second, and then disconnecting. See page 13.

 Remote configuration  allows your Premier 56 modem to be configured from a remote location.

See page 15.

Getting Started

To configure your Premier 56 modem’s security features, you enable security and enter Superuser
Mode.

Enabling Security

To enable security mode, type the command AT$EH=<password> and press the Enter key, where
<password> is the password used to enable the modem’s security feature. The default password is
superuser and is not case-sensitive. For security purposes, we recommend you change the default

security password (see “Changing the Security, Superuser, and Remote Configuration Password” on
page 16).

Entering Superuser Mode

The Superuser can type AT commands that the modem is to execute, including the AT commands used
to configure the modem’s security features and change passwords.

By default, Superuser Mode is disabled. When Superuser Mode is disabled and security is enabled, the
only at commands you can issue are:

 ATIn to report the requested result according to the command parameter (see page 40)

 AT&V to display the modem’s current configuration and stored profiles (see page 65)

To enter Superuser Mode:

Page 11

Using the Modem’s Security Feature

1. Enable security if it is not currently enabled (see “Enabling Security,” above).

2. Type AT$S=<password> and press the Enter key, where <password> is the same one used to enable

the modem’s security feature.

The default password is superuser and is not case-sensitive. For security purposes, we recommend
you change this default password (see “Changing the Security, Superuser, and Remote
Configuration Password” on page 16).

If you no longer want to be in Superuser Mode, type the command AT$$ and press the Enter key to exit
Superuser mode.

Password Protection

Your Premier 56 modem provides a password-protection feature that requires a remote modem user to
enter a password before data can be exchanged. After your Premier 56 modem validates the password
entered by the remote user, the modem operates normally, allowing data to be transferred between its
host and the remote host. If an incorrect password is entered, your Premier 56 modem disconnects.

Your Premier 56 modem supports 20 users. By default, each user has the password user<n>, where <n>
corresponds to the user number. For example, user number 8 has the password user8. For security
purposes, we recommend that you change the default password for your users (see “Changing the
Default User Passwords” on page 16).

Enabling Password Protection

The following procedure describes how to enable password protection. To use this feature, you must
first enable the modem’s security feature and then enter Superuser Mode.

1. Enable security and Superuser Mode if they are not currently enabled (see “Enabling Security” and

“Entering Superuser Mode” on page 11).

Note: To see whether security and Superuser Mode are enabled, type the command AT$D? and
press Enter (for more information, see “Viewing Security Status” on page 17).

3. Type AT$Un<password> and press the Enter key. In this command:

 n is a user number from 1 to 20.

 <password> is a password you want to assign to the user. It can be up to 9 alphanumeric

characters long and is not case-sensitive.

Example: AT$U2ze68nam assigns the password ze68nam to user 2.

Page 12

Using the Modem’s Security Feature

4. Repeat step 3 for each additional user whose password you want to set up.

The Password Protection Process

After your Premier 56 modem is configured for password protection, a remote modem user who calls
your Premier 56 modem sees a CONNECT result code followed by the following prompt:

PLEASE ENTER YOUR PASSWORD===>>

The user at the remote modem provides a user number and a password using the following syntax (for
security, each password character appears as an asterisk):

<user#,password>

For example:

2,zeus

specifies user 2 with a password of zeus.

If the password corresponds to the user number, your Premier 56 modem issues the following message
to indicate that the connection between the two modems is secure and data can be transferred securely
between the two modems:

CONNECTION SECURE

If the password entered does not correspond to the user number, the following message appears and your
Premier 56 modem allows two more retries:

WRONG PASSWORD, PLEASE RETRY

If the correct password is not entered after the third attempt, your Premier 56 modem issues the
following message and disconnects the call:

WRONG PASSWORD, DISCONNECTING

Security Callback

Your Premier 56 modem provides an security callback feature. With this feature, a remote user calls the
Premier 56 modem from a telephone number preconfigured at the Premier 56 modem. When the Premier
56 modem answers the call, it prompts the remote user for a user ID and password. Once this
information is entered, the Premier 56 modem disconnects the call, and verifies that the ID and
password entered are correct. If the information is correct, the Premier 56 modem automatically calls
back the user at the preconfigured telephone number.

Page 13

Using the Modem’s Security Feature

Enabling Security Callback

The following procedure describes how to enable security callback. To use this feature, you must first
enable the modem’s security feature and then enter Superuser Mode.

1. Enable security and Superuser Mode if they are not currently enabled (see “Enabling Security” and

“Entering Superuser Mode” on page 11).

Note: To see whether security and Superuser Mode are enabled, type the command AT$D? and
press Enter (for more information, see “Viewing Security Status” on page 17).

2. Type the command AT$Cn=<telephone number> where:

 n is a user number from 1 to 20.

 <telephone number> is the telephone number of the remote modem that your Premier 56

modem is to call back.

Example: AT$C4=9,9495551212 specifies a telephone number of 9,9495551212 to user 4. The
number 9 and comma typically are used when dialing through a PBX (9 accesses an outside line and
the comma pauses the modem before accessing the outside line).

3. Repeat step 3 for each additional user whose callback number you want to set up (your Premier 56

modem supports up to 20 users).

The Security Callback Process

After your Premier 56 modem is configured for security callback, a remote modem user who calls your
Premier 56 modem sees a CONNECT result code followed by the following prompt:

PLEASE ENTER YOUR PASSWORD===>>

The user at the remote modem provides a user number and a password using the following syntax (for
security, each password character appears as an asterisk):

<user#,password>

For example:

2,zeus

specifies user 2 with a password of zeus.

If the password corresponds to the user number, your Premier 56 modem issues the following message

on the computer attached to it, ends the modem connection automatically, calls back the remote
modem, and establishes a secure connection with it.

Page 14

Using the Modem’s Security Feature

PASSWORD ACCEPTED ===>> WAIT FOR CALLBACK

If the password entered does not correspond to the user number, the following message appears and your
Premier 56 modem allows two more retries.

WRONG PASSWORD, PLEASE RETRY

If the correct password is not entered after the third attempt, your Premier 56 modem issues the
following message, disconnects the call, and does not call back the remote modem:

WRONG PASSWORD, DISCONNECTING

Remote Configuration

Remote configuration allows a remote user to configure the Premier 56 modem. To perform remote
configuration, the remote user issues a sequence of three ASCII characters specified by Register S13.
The default character is the equal (=) sign. You can change the value of Register S13 to select a
different character, or specify a value greater than 127 for Register S13 to disable the remote
configuration. The following sequence describes the remote-configuration process.

The remote user makes a data connection with the Premier 56 modem. After the data connection is
made, the remote user types three equal signs without entering the AT prefix before the characters or
pressing the Enter key afterward. The following prompt appears for the remote user:

PASSWORD =>

The remote user enters the password. The default password is superuser and is not case-sensitive. For
security purposes, we recommend you change this default password (see “Changing the Security,
Superuser, and Remote Configuration Password” on page 16). Each password character typed appears as
an asterisk (*).

If the password entered is correct, the following message appears below the remote user’s PASSWORD
prompt (in the message below, RC means Remote Configuration):

RC ESTABLISHED
OK

The remote user can then issue AT commands and your Premier 56 modem will execute them. The only
AT commands that cannot be used during remote configuration are A, D, H, &T, and \B. Issuing these
commands results in an ERROR result code and the Premier 56 modem ignores the command. When the
remote user finishes configuring the Premier 56 modem, he types ATO and presses Enter to return to
Data Mode (a result code does not appear at either modem when they return to Data Mode). Data can
then be exchanged between the two modems.

Note: Entering remote configuration mode automatically enables Superuser mode; this means, the

Page 15

Using the Modem’s Security Feature

password and callback procedures described earlier in this chapter can be performed, without
having to issue the commands to enter Superuser mode.

If the remote user fails to enter the correct passwords within 15 seconds, he received an ERROR result
code. The connection between the two modems is preserved and the remote user can try to enable
remote configuration again.

Performing Miscellaneous Activities

The following sections describe how to perform the following security activities:

 Changing the security, Superuser, and remote configuration password

 Changing the default user passwords

 Viewing the security status

Changing the Security, Superuser, and Remote Configuration Password

Your Premier 56 modem uses the same password for enabling security, entering Superuser Mode, and
enabling remote configuration. The default password is superuser and is not case-sensitive. For security
purposes, we recommend you use the following procedure to change the default security password.

1. Enable security if it is not currently enabled (see “Enabling Security” on page 16).

2. Enable Superuser Mode if it’s not currently enabled (see “Enabling Superuser Mode” on page 15).

3. Type AT$US<password> where <password> is the new password. The password can be up to 9

alphanumeric characters long and is not case-sensitive.

Changing the Default User Passwords

Your modem supports up to 20 users. By default, each user has the password user<n>, where <n>
corresponds to the user number. For example, user number 8 has the password user8. For security
purposes, we recommend that you change the default password for your users before you use your
Premier 56 modem’s security features.

1. Enable security and Superuser Mode if they are not currently enabled (see “Enabling Security” and

“Entering Superuser Mode” on page 11).

Note: To see whether security and Superuser Mode are enabled, type the command AT$D? and

press Enter (for more information, see “Viewing Security Status” on page 17).

Page 16

Using the Modem’s Security Feature

2. Type AT$Un<password> and press the Enter key. In this line:

 n is a user number from 1 to 20.

 <password> is a password you want to assign to the user. It can be up to 9 alphanumeric

characters long and is not case-sensitive.

Example: AT$U2ze68nam assigns the password ze68nam to user 2.

4. Repeat step 3 for each additional user whose password you want to set up.

Viewing Security Status

There may be times when you want to view whether security and Superuser Mode are enabled. To view
the security status, type the command AT$D? and press the Enter key. Your Premier 56 modem
responds with messages that show whether security and Superuser Mode are enabled. The following
examples show the possible responses that can appear.

Security and Superuser
Mode are enabled.

SECURITY ON
SUPERUSER

Security is disabled and
Superuser Mode is enabled

SECURITY OFF
SUPERUSER

Security is enabled and
Superuser Mode is disabled

SECURITY ON
NON-SUPERUSER

Security and Superuser
Mode are both disabled

SECURITY OFF
NON-SUPERUSER

Page 17

NOTES

Using the Modem’s Security Feature

Page 18

Using the Modem’s Auto-Connect Feature

Chapter 4

Using the Modem’s Auto-Connect Feature

Your Premier 56 modem can emulate a leased-line connection over the Public Switched Telephone
Network (PSTN). Using the $DL command, you can configure the modem to work similarly to the
“always connected” functionality used with leased lines. This feature is useful in environments where a
leased line is not available or is cost prohibitive. In certain environments, this feature is more robust in
recovering from network failures.

When the $DL command is used, your Premier 56 modem automatically dials the first of four telephone
numbers you have stored using the &Zn=x command. If the call fails or is disconnected, your modem
waits a user-defined number of seconds before redialing the number. If the redialing attempt fails to
make a connection (for example, if the number dialed is busy or the called modem does not answer),
your modem automatically dials the next number stored with the &Zn=x command. The modem repeats
this round-robin method until a dialed number results in a data connection.

Storing Telephone Numbers

Before you use the &Zn=x command, store up to four telephone numbers in your modem’s nonvolatile
memory. These are the telephone numbers your modem automatically dials when it executes an $DL
command.

In the command &Zn=x, n is a decimal number from 0 to 3 that corresponds to a location in the
modem’s nonvolatile memory and x is a dial string up to 31 characters long. The following examples
show how to store sample dial strings in the modem’s nonvolatile memory.

Example Description

AT&Z0=5551212 Stores dial string 5551212 in nonvolatile memory location 0.

AT&Z1=9,19495551234 Stores dial string 9,19495551234 in nonvolatile memory location 1.

AT&Z2=T9,P5552468 Stores dial string AT&Z2=T9,P5552468 in nonvolatile memory

location 2.

AT&Z3=9,5552468 Stores dial string AT&Z3=9,5552468 in nonvolatile memory location

2.

Page 19

Using the Modem’s Auto-Connect Feature

Configuring the $DL Timeout

The $DL timeout determines how long your modem waits between dialing attempts when a call dialed
with the $DL command does not establish a data connection with the remote modem. This timeout value
is controlled by Register S32. By default, Register S32 is set to 30 seconds. If desired, you can increase
or shorten this timeout value. To change this default value, type the following command line and press
the Enter key.

ATS32=n where n is the number of seconds the modem is to wait, from 1 to 255. Entering a value of 0
specifies the default timeout value of 30 seconds.

Enabling the Auto-Connect Feature

To enable the auto-connect feature, type AT$DLON and press Enter. When you enable this feature,
your modem automatically dials the dial string in nonvolatile memory position 0. If your modem fails to
make a data connection, it waits the $DL timeout time specified by Register S32, then automatically
dials the dial string stored in the next nonvolatile memory position. Your modem continues this round­robin s until it makes a data connection with a remote modem.

If the remote modem disconnects, your modem automatically redials the number of the previous
connection. If that dialing attempt fails to make a connection, your modem dials the dial string stored in
the next nonvolatile memory positions until it makes a data connection with a remote modem. The
modem repeats this round-robin method until a dialed number results in a data connection.

To disable the auto-connect feature, type AT$DLOFF and press Enter.

Viewing the Current $DL Setting

To view the current setting of the $DL command, type AT$DL? And press Enter.

 If auto-connect is enabled, your modem responds with: ON

 If auto-connect is disabled, your modem responds with: OFF

Page 20

Upgrading the Modem Firmware

Chapter 5

Upgrading the Modem Firmware

Your Premier 56 modem can have its firmware upgraded in the field, without having to return the
modem to Telenetics. To upgrade the firmware, you need:

 A personal computer running HyperTerminal.

 An straight-through RS-232 cable (at least 8 pins) that supports all control signals.

 The loader and data files from Telenetics.

To upgrade the modem firmware:

1. Make a directory on your computer’s hard drive. In that directory, place the loader and data files

supplied by Telenetics. The loader file has the word load in its name (for example,
F44Aload.S37), while the data file has the prefix rc (for example, rc_111003.S37).

2. Connect one end of the RS-232 cable to your computer’s serial port. Connect the other end of the

cable to your Premier 56 modem.

3. Turn on the modem, then reboot your computer. After your computer reboots, close all other

applications that may have opened automatically.

4. Start HyperTerminal and configure your session to use the following parameters:

 Baud rate: 115,200 bps

 Data bits: 8

 Parity: None

 Stop bits: 1

 Flow control: Hardware

5. Verify that the PWR, DIR, RTS, and CTS LEDs on the Premier 56 modem are ON.

Page 21

Upgrading the Modem Firmware

6. In HyperTerminal, issue the command AT** and press the Enter key. The message download

initiated.. appears in your HyperTerminal window.

7. In HyperTerminal, click the Transfer menu and click Send Text File.

8. When the Send Text File dialog box appears, change Files of type at the bottom of the dialog box to

All files (*.*). Then navigate to the directory where you placed the loader file. When you find the
loader file, either double-click it, or click it and click the Open button. Your HyperTerminal window
should resemble the following as the flash code is downloaded to the modem.

at**

Download initiated ..

....................................................................................

....................................................................................

....................................................................................

....................................................................................

....................................................................................

....................................................................................

................................................

Flash loader - Rev. 44

Standard download mode
ATMEL AT49F002(N)T/AT49BV002(N)T/AT49LV002(N)T Mfr_ID=1F Dev_ID=08
2MBit Device Detected
Download flash code ..

9. In HyperTerminal, click the Transfer menu and click Send Text File.

10. When the Send Text File dialog box appears, change Files of type at the bottom of the dialog box to

All files (*.*). Then navigate to the directory where you placed the data file. When you find the data
file, either double-click it, or click it and click the Open button. After about one minute, your
HyperTerminal window should resemble the following as your modem is being programmed.

....................................................................................

....................................................................................

....................................................................................

........................................................................

Device successfully programmed

When the message Device successfully programmed appears, power-off the modem for

11.

five seconds, then power it on.

Note: Updating the modem firmware does not affect any command profiles saved to the modem’s
nonvolatile memory nor any security features that were set prior to the upgrade. This means you
can use your Premier 56 modem immediately after upgrading the firmware, without having to

reconfigure it.

Page 22

AT Commands

Appendix A

AT Commands

Syntax and Procedures

The command and response syntax and procedures generally conform to referenced recommendations
and standards. Since these recommendations and standards describe characteristics universal to a large
installed base of modems to a maximum degree, there may be syntax and procedural differences due to
extensions and behavioral differences in implemented commands, parameters, and responses beyond
that described in these recommendations and standards.

The syntax and procedures described in this appendix are based on V.250 and V.253 with additional
information included for implemented extensions, behavioral differences beyond V.250, and legacy
commands.

Alphabet

The T.50 International Alphabet 5 (IA5) is used in this document. Only the low-order seven bits of each
character are significant to the modem; any eighth or higher-order bit(s), if present, are ignored for the
purpose of identifying commands and parameters. Lower-case characters are considered identical to
their upper-case equivalents when received by the modem from the DTE. Result codes from the modem
are in upper case.

DTE Commands Lines

Words enclosed in <angle brackets> are references to syntactical elements. The brackets are not used
when the words appear in a command line, the brackets are not used. Words enclosed in [square
brackets] represent optional items which may be omitted from the command line at the specified point.
The square brackets are not used when the words appear in the command line. Other characters that
appear in syntax descriptions must as included as shown. Any modem responses are mentioned in terms
of their alphabetic format; the actual response issued will depend on the setting of parameters that affect
response formats, e.g., Q and V commands (see 2.7).

Page 23

Command Line General Format

A command line is made up of three elements: the prefix, the body, and the termination
character.

The command line prefix consists of the characters "AT" or "at". To repeat the execution
of the previous command line, the characters "A/" or "a/" are used without typing the
command line prefix.

The body is made up of individual commands described in this document. Space
characters (IA5 2/0) are ignored and may be used freely for formatting purposes, unless
they are embedded in numeric or string constants. The termination character may not
appear in the body. The modem can accept at least 50 characters in the body.

The termination character may be selected by a user option (parameter S3), the default
being CR.

Command Line Editing

AT Commands

The character defined by parameter S5 (default, BS) is interpreted as a request from the
DTE to the modem to delete the previous character. Any control characters (IA5 0/0
through 1/15, inclusive) that remain in the command line after receipt of the termination
character are ignored by the modem.

The modem checks characters from the DTE first to see if they match the termination
character (S3), then the editing character (S5), before checking for other characters. This
ensures that these characters will be properly recognized even if they are set to values
that the modem uses for other purposes. If S3 and S5 are set to the same value, a
matching character will be treated as matching S3 (S3 is checked before S5).

Command Line Echo

The modem may echo characters received from the DTE during command state and
online command state back to the DTE, depending on the setting of the E command. If
enabled, characters received from the DTE are echoed in the same format as received.
Invalid characters in the command line or incomplete or improperly formed command
line prefixes may not be echoed.

Page 24

Repeating a Command Line

If the prefix "A/" or "a/" is received, the modem immediately executes once again the
body of the preceding command line. No editing is possible, and no termination character
is necessary. A command line may be repeated multiple times in this manner.

Responses to the repeated command line are issued using format of the original command
line. If "A/" is received before any command line has been executed, the preceding
command line is assumed to have been empty (that results in an OK result code).

Types of DTE Commands

There are two types of commands: action commands and parameter commands.
Commands of either type may be included in command lines, in any order.

Action commands may be "executed" (to invoke a particular function of the equipment,
which generally involves more than the simple storage of a value for later use), or
"tested" (to determine whether or not the equipment implements the action command,
and, if sub parameters are associated with the action, the ranges of sub parameter values
that are supported).

AT Commands

Parameters may be "set" (to store a value or values for later use), "read" (to determine the
current value or values stored), or "tested" (to determine whether or not the equipment
implements the parameter, and the ranges of values supported).

Basic Syntax Commands

Basic Syntax Command Format

The format of Basic Syntax commands, except for the D and S commands, is as follows:

<command>[<number>]

where <command> is either a single character, or the "&" character followed by a single
character per V.250. In addition, <command> can be the "%" character followed by a
single character, the "*" character followed by a single character, or the "^" character
followed by a single character.

<number> may be a string of one or more characters from "0" through "9" representing a
decimal integer value. Commands that expect a <number> are noted in the description
of the command. If a command expects <number>and it is missing (<command> is
immediately followed in the command line by another <command> or the termination
character), the value "0" is assumed. If a command does not expect a <number> and a

Page 25

number is present, an ERROR is generated. All leading "0"s in <number> are ignored by
the modem.

Additional commands may follow a command (and associated parameter, if any) on the
same command line without any character required for separation. The actions of some
commands cause the remainder of the command line to be ignored (e.g., A).

See the D command for details on the format of the information that follows it.

S Parameters

Commands that begin with the letter "S" are known as "S-parameters". The number
following the "S" indicates the "parameter number" being referenced. If the number is not
recognized as a valid parameter number, an ERROR result code is issued.

Immediately following this number, either a "?" or "=" character must appear. "?" is used
to read the current value of the indicated S-parameter; "=" is used to set the S-parameter
to a new value.

AT Commands

S<parameter_number>?
S<parameter_number>=[<value>]

If the "=" is used, the new value to be stored in the S-parameter is specified in decimal
following the "=". If no value is given (i.e., the end of the command line occurs or the
next command follows immediately), the S-parameter specified may be set to 0, or an
ERROR result code issued and the stored value left unchanged. The ranges of acceptable
values are given in the description of each S-parameter.

If the "?" is used, the modem transmits a single line of information text to the DTE. The
text portion of this information text consists of exactly three characters, giving the value
of the S-parameter in decimal, with leading zeroes included.

Page 26

Extended Syntax Commands

Command Naming Rules

Both actions and parameters have names, which are used in the related commands.
Names always begin with the character "+". Following the "+", from one to 16 additional
characters appear in the command name. These characters will be selected from the
following set:

A through Z (IA5 4/1 through 5/10)
0 through 9 (IA5 3/0 through 3/9)
! (IA5 2/1)
% (IA5 2/5)

- (IA5 2/13)
. (IA5 2/14)

/ (IA5 2/15)
: (IA5 3/10)
_ (IA5 5/15)

The first character following the "+" is an alphabetic character in the range of "A"
through "Z". This first character generally implies the application in which a command is
used (e.g., F for Fax or V for voice).

AT Commands

The modem considers lower-case characters to be the same as their upper-case
equivalents.

Values

When sub parameters are associated with the execution of an action, or when setting a
parameter, the command may include specification of values. This is indicated by the
appearance of <value> in the descriptions below.

<value> consists of either a numeric constant or a string constant.

Numeric Constants

Numeric constants are expressed in decimal, hexadecimal, or binary.

Decimal numeric constants consist of a sequence of one or more of the characters "0"
through "9", inclusive.

Hexadecimal numeric constants consist of a sequence of one or more of the characters
"0" through "9", inclusive, and "A" through "F" inclusive. The characters "A" through
"F" represent the equivalent decimal values 10 through 15.

Page 27

AT Commands

Binary numeric constants consist of a sequence of one or more of the characters "0" and
"1".

In all numeric constants, the most significant digit is specified first. Leading "0"
characters are ignored by the modem. No spaces, hyphens, periods, commas,
parentheses, or other generally-accepted numeric formatting characters are permitted in
numeric constants; note in particular that no "H" suffix is appended to the end of
hexadecimal constants.

String Constants

String constants consist of a sequence of displayable IA5 characters, each in the range
from 2/0 to 7/15, inclusive, except for the characters ‘"’ (IA5 2/2) and "\" (IA5 5/12).
String constants are bounded at the beginning and end by the double-quote character (‘"’,
IA5 2/2).

Any character value may be included in the string by representing it as a backslash ("\")
character followed by two hexadecimal digits. For example, "\0D" is a string consisting
of the single character <CR> (IA5 0/13). If the "\" character itself is to be represented in a
string, it is encoded as "\5C". The double-quote character, used as the beginning and
ending string delimiter, is represented within a string constant as "\22".

A "null" string constant, or a string constant of zero length, is represented by two
adjacent delimiters ("").

Compound Values

Actions may have more than one sub parameter associated with them, and parameters
may have more than one value. These are known as "compound values", and their
treatment is the same in both actions and parameters.

A compound value consists of any combination of numeric and string values (as defined
in the description of the action or parameter). The comma character must be included as a
separator, before the second and all subsequent values in the compound value. If a value
is not specified (i.e., defaults assumed), the required comma separator must be specified;
however, trailing comma characters may be omitted if all associated values are also
omitted.

Page 28

Action Commands

Action Execution Command Syntax

There are two general types of action commands: those that have associated sub
parameter values that affect only that invocation of the command, and those that have no
sub parameters.

If sub parameters are associated with a command, the definition of the action command
indicates, for each sub parameter, whether the specification of a value for that sub
parameter is mandatory or optional. For optional sub parameters, the definition indicates
the assumed (default) value for the sub parameter if no value is specified for that sub
parameter; the assumed value may be either a previous value (i.e., the value of an omitted
sub parameter remains the same as the previous invocation of the same command, or is
determined by a separate parameter or other mechanism), or a fixed value (e.g., the value
of an omitted sub parameter is assumed to be zero). Generally, the default value for
numeric subparameters is 0, and the default value for string subparameters is "" (empty
string).

AT Commands

The following syntax is used for actions that have no subparameters:

+<name>

The following syntax is used for actions that have one subparameter:

+<name>[=<value>]

The following syntax is used for actions that have two or more subparameters:

+<name>[=<compound_value>]

For actions that accept subparameters, if all subparameters are defined as being optional,
and the default values for all subparameters are satisfactory, the data terminal equipment
(DTE) may use the first syntax above (i.e., omit the "=" from the action execution
command as well as all of the subparameter value string).

If all other relevant criteria are met (e.g., the modem is in the proper state), the command
is executed with any indicated subparameters. If <name> is not recognized, the modem
issues the ERROR result code and terminates processing of the command line. An
ERROR is also generated if a subparameter is specified for an action that does not
accept subparameters, if too many subparameters are specified, if a mandatory
subparameter is not specified, if a value is specified of the wrong type, or if a value is
specified that is not within the supported range.

Page 29

Action Test Command Syntax

The DTE may test if an action command is implemented in the modem by using the
syntax:

+<name>=?

If the modem does not recognize the indicated name, it returns an ERROR result code
and terminates processing of the command line. If the modem does recognize the action
name, it returns an OK result code. If the named action accepts one or more
subparameters, the modem sends an information text response to the DTE, prior to the
OK result code, specifying the values supported by the modem for each such
subparameter, and possibly additional information. The format of this information text is
defined for each action command.

Parameter Commands

Parameter Types

AT Commands

string).

Parameters may be defined as "read-only" or "read-write". "Read-only" parameters are
used to provide status or identifying information to the DTE, but cannot be set by the
DTE; attempting to set their value is an error. In some cases (specified in the description
of the individual parameter), the modem may ignore attempts to set the value of such
parameters rather than respond with an ERROR result code, if the continued correct
operation of the interface between the modem and DTE will not be affected by such
action. Read-only parameters may be read and tested.

"Read-write" parameters may be set by the DTE, to store a value or values for later use.
Read-write parameters may be set, read, and tested.

Parameters may take either a single value, or multiple (compound) values. Each value
may be either numeric or string; the definition of the parameter will specify the type of
value for each subparameter. Attempting to store a string value in a numeric parameter,
or a numeric value in a string parameter, is an error.

Parameter Set Command Syntax

The definition of the parameter indicates, for each value, whether the specification of that
value is mandatory or optional. For optional values, the definition indicates the assumed
(default) value if none is specified; the assumed value may be either a previous value
(i.e., the value of an omitted subparameter retains its previous value), or a fixed value
(e.g., the value of an omitted subparameter is assumed to be zero). Generally, the default
value for numeric parameters is 0, and the default value for string parameters is "" (empty

Page 30

AT Commands

The following syntax is used for parameters that accept a single value:

+<name>=[<value>]

The following syntax is used for parameters that accept more than one value:

+<name>=[<compound_value>]

For each implemented parameter, if all mandatory values are specified, and all values are
valid according to the definition of the parameter, the specified values are stored. If
<name> is not recognized, one or more mandatory values are omitted, or one or more
values are of the wrong type or outside the permitted range, the modem issues the
ERROR result code and terminates processing of the command line. An ERROR is also
generated if too many values are specified. In case of an error, all previous values of the
parameter are unaffected.

Parameter Read Command Syntax

The DTE may determine the current value or values stored in a parameter by using the
following syntax:

+<name>?

The modem responds by sending the current values stored for the parameter to the DTE
in an information text response. The format of this response is described in the definition
of the parameter. Generally, the values are sent in the same form in which they would be
issued by the DTE in a parameter setting command; if multiple values are supported, they
will generally be separated by commas, as in a parameter setting command.

Parameter Test Command Syntax

The DTE may test if a parameter is implemented in the modem, and determine the
supported values, by using the syntax:

+<name>=?

If the modem does not recognize the indicated name, it returns an ERROR result code
and terminates processing of the command line. If the modem does recognize the
parameter name, it returns an information text response to the DTE, followed by an OK
result code. The information text response indicates the values supported by the modem
for each such subparameter, and possibly additional information. The format of this
information text is defined for each parameter.

Page 31

Additional Syntax Rules

Concatenating Commands after Extended Syntax Commands

Additional commands may follow an extended-syntax command on the same command
line if a semicolon (";") is inserted after the preceding extended command as a separator.

The semicolon is not necessary when the extended syntax command is the last command
on the command line.

Concatenating Commands after Basic Format Commands

Extended syntax commands may appear on the same command line after a basic syntax
command without a separator, in the same manner as concatenation of basic syntax
commands.

Issuing Commands

AT Commands

All characters in a command line must be issued at the same data rate, and with the same
parity and format.

The modem will ignore any command line that is not properly terminated. The modem
may consider 30 seconds of mark idle time between any two characters as an improperly
terminated command line. In this case the modem may or may not generate an ERROR
message. The modem will ignore any characters received from the DTE that are not part
of a properly-formatted command line.

If the maximum number of characters that the modem can accept in the body is exceeded,
an ERROR result code is generated after the command line is terminated.

The DTE will not begin issuing a subsequent command line until at least one-tenth of a
second has elapsed after receipt of the entire result code issued by the modem in response
to the preceding command line.

Executing Commands

Upon receipt of the termination character, the modem commences execution of the
commands in the command line in the order received from the DTE. Should execution of
a command result in an error, or a character be not recognized as a valid command,
execution is terminated, the remainder of the command line is ignored, and the ERROR
result code is issued. Otherwise, if all commands execute correctly, only the result code
associated with the last command is issued; result codes for preceding commands are

suppressed. If no commands appear in the command line, the OK result code is issued.

Page 32

Aborting Commands

Some action commands that require time to execute may be aborted while in progress;
these are explicitly noted in the description of the command. Aborting of commands is
accomplished by the transmission from the DTE to the modem of any character. A single
character is sufficient to abort the command in progress; however, characters transmitted
during the first 125 milliseconds after transmission of the termination character are
ignored (to allow for the DTE to append additional control characters such as line feed
after the command line termination character). To ensure that the aborting character is

recognized by the modem, it should be sent at the same rate as the preceding
command line; the modem may ignore characters sent at other rates. When such an

aborting event is recognized by the modem, the modem terminates the command in
progress and returns an appropriate result code to the DTE, as specified for the particular
command.

Handling of Invalid Numbers and S-Parameter Values

The modem reacts to undefined numbers and S-parameter values in one of three ways:

AT Commands

 Issue the ERROR result code, and leave the previous value of the parameter

unchanged;

 Issue the OK result code, and leave the previous value of the parameter unchanged;

or,

 Issue the OK result code, and set the parameter value to the valid value nearest to that

specified in the command line.

The description of each command specifies which of these three techniques is used to
handle invalid parameter values for that command or parameter.

Modem Responses

While in command state and online command state, the modem will issue responses
using the same rate, word length, and parity as the most recently received DTE command
line. In the event that no DTE command has yet been received, rate, word length, and
parity used will depend on the capabilities of the modem.

When the modem transitions from the command state or online command state to the
online data state, the result code CONNECT should be issued at the bit rate and parity
used during the command state. When the modem transitions from the online data state to
the command state or online command state, the result codes should be issued at the bit
rate used during the online data state. Thereafter, any unsolicited result codes should use
the bit rate and parity of the last command line issued by the DTE to the modem.

Page 33

The characters of a response will be contiguous, with no more than 100 milliseconds of
mark idle issued between characters in addition to stop elements.

Responses

There are two types of responses that may be issued by the modem: information text and
result codes.

Information Text. Information text responses consist of three parts: a header,
information text, and a trailer:

The characters transmitted for the header are determined by the V command.

The trailer consists of two characters, being the character having the ordinal value of
parameter S3 followed by the character having the ordinal value of parameter S4.

Information text usually consists of a single line; information text returned in response to
some commands may contain multiple lines, and the text may therefore include CR, LF,
and other formatting characters to improve readability.

AT Commands

Result Code Parts. Result codes consist of three parts: a header, the result text, and a

trailer.

The characters transmitted for the header and trailer are determined by the V command
setting.

The result text may be transmitted as a number or as a string, also depending on a the V
command setting.

Result Code Types. There are three types of result codes: final, intermediate, and
unsolicited. Result codes are described in later in this appendix.

A final result code indicates the completion of a full modem action and a ability to accept
new commands from the DTE.

An intermediate result code is a report of the progress of an modem action. The
CONNECT result code is an intermediate result code. In the case of a dialing or
answering command, the modem switches from command state to online data state, and
issues a CONNECT result code. This is an intermediate result code for the modem
because it cannot accept commands from the DTE while in online data state. When the
modem switches back to the command state it then issues a final result code (such as OK
or NO CARRIER).

Unsolicited result codes (such as RING) indicate the occurrence of an event not directly
associated with the issuance of a command from the DTE.

Page 34

Extended Syntax Result Codes

Extended syntax result codes may be issued in response to either basic or extended
commands, or both. The appropriate responses are specified in the definitions of the
commands, the responses, or both.

The general format of extended syntax result codes is the same as result codes defined in
TIA-602 with regard to headers and trailers. The characters specified in S-parameters S3
and S4 are used in headers and trailers of extended syntax result codes as they are in
basic format result codes. The setting of the V command affects the headers and trailers
associated with extended syntax result codes in the same manner as basic format result
codes; however, unlike basic format result codes, extended syntax result codes have no
numeric equivalent, and are always issued in alphabetic form.

Extended syntax result codes are subject to suppression by the Q1 command, as with
basic format result codes. The issuance of extended syntax result codes are not be
affected by the setting of the X command.

Extended syntax result codes may be either final, intermediate, or unsolicited; the type
being indicated in the definition of the result code.

AT Commands

Extended syntax result codes are prefixed by the "+" character to avoid duplication of
basic format result codes specified in TIA-602. Following the "+" character, the name of
the result code appears; result code names follow the same rules as command names.

Extended syntax result codes may include the reporting of values. The definition of the
result code specifies whether or not values are appended to the result code, and, if so,
how many, their types, and their assumed default values if omitted.

Data/voice Modes. When no values are to be reported, the result code appears in the
simplest form:

+<name>

If a single value is to be reported, the form of the result code is:

+<name>: <value>

A single space character separates the colon character from the <value>; no space
appears between the result code name and the colon. If multiple values are to be reported
with the result code, the form is:

+<name>: <compound_i>

Fax Modes. If a single value is to be reported, the form of the result code is:

<value> or (<value>)

Page 35

AT Commands

+<name>: <compound_value>Information Text Formats for Test Commands

In general, the format of information text returned by extended syntax commands is
described in the definition of the command.

The modem may insert intermediate <CR> characters in very long information text
responses in order to avoid overrunning DTE receive buffers. If intermediate <CR>
characters are included, the modem does not include the character sequences "0 <CR>"or
"OK<CR>", so that DTE can avoid false detection of the end of these information text
responses.

Range of Values

When the action accepts a single numeric subparameter, or the parameter accepts only
one numeric value, the set of supported values may be presented in the information text
as an ordered list of values. The list is preceded by a left parenthesis (() , and is followed
by a right parenthesis ()). If only a single value is supported, it appears between the
parentheses. If more than one value is supported, then the values may be listed
individually, separated by comma characters, or, when a continuous range of values is
supported, by the first value in the range, followed by a hyphen character (-), followed by
the last value in the range. The specification of single values and ranges of values may be
intermixed within a single information text. In all cases, the supported values are
indicated in ascending order.

For example, the following are some examples of value range indications:

(0) Only the value 0 is supported.

(1,2,3) The values 1, 2, and 3 are supported.
(1-3) The values 1 through 3 are supported.
(0,4,5,6,9,11,12) The several listed values are supported.
(0,4-6,9,11-12) An alternative expression of the above list.

Compound Range of Values

When the action accepts more than one subparameter, or the parameter accepts more than
one value, the set of supported values is presented as a list of the parenthetically-enclosed
value range strings described above, separated by commas. For example, the information
text in response to testing an action that accepts three subparameters, and supports
various ranges for each of them, could appear as follows:

This indicates that the first subparameter accepts only the value 0, the second accepts any
value from 1 through 3 inclusive, and the third subparameter accepts any of the values 0,

4, 5, 6, 9, 11, or 12.

(0),(1-3),(0,4-6,9,11-12)

Page 36

Data Command Set

Command Guidelines

The commands used to control and report modem operation in data modem mode are
defined in this section.

The Data Modem Mode commands and responses described in this section are applicable
when command +FCLASS=0.

The default values are typical of a fully configured modem supporting all data rates and
options. The actual default value is dependent upon installed modem firmware and
country specific parameters.

Commands are accepted by the modem once the previous command has been fully
executed, which is normally indicated by the return of an appropriate result code.
Execution of commands D and A, either as a result of a direct command or a re-execute
command, will be aborted if another character is entered before completion of the
handshake.

AT Commands

Escape Code Sequence

When the modem has established a connection and has entered on-line data mode, it is
possible to break into the data transmission in order to issue further commands to the
modem in an on-line command mode. This is achieved by the DTE sending to the modem
a sequence of three ASCII characters specified by register 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.

Data Commands

The modem will respond to the commands detailed below. Parameters applicable to each
command are listed with the command description. The defaults shown for each
configuration command are those used in the Conexant factory profile 0.

Generic Modem Control

Z - Soft Reset and Restore Profile

This command causes the modem to perform a soft reset and restore (recall) the
configuration profile. If no <value> is specified, zero is assumed.

Page 37

AT Commands

Syntax
Defined Values

<value> Decimal number corresponding to the selected profile.

1 Soft reset and restore stored profile 1.

Result Codes

ERROR Otherwise.

Z<value>

0 Soft reset and restore stored profile 0.

OK <value> = 0 or 1.

+FCLASS - Select Active Service Class

This command selects the active service class (mode).

Syntax
Defined Values

<mode> Decimal number which corresponds to the selected service

1 Select Facsimile Class 1 Mode.

1.0 Select Facsimile Class 1.0 Mode.
2 Select Facsimile Class 2 Mode.
8 Select Voice Mode.
10 Reserved.

Result Codes

ERROR Otherwise.
Reporting Current or Selected Values
Command: +FCLASS?
Response: +FCLASS: <mode>
Example: +FCLASS: 0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +FCLASS?
Response: +FCLASS: (<mode> range)
Example: +FCLASS: (0,1,1.0,2,8,10)

+FCLASS=<mode>

class.

0 Select Data Mode (Default.)

OK <value> = 0 or 1. For <mode> = 0, 1, 1.0, 2, 8, and 10

(SmartSCM only).

OK <value> = 0 or 1. For <mode> = 0, 1, 1.0, 8, and 10 (other than

SmartSCM).

Page 38

AT Commands

+VCID - Caller ID (CID)

This command controls the reporting and presentation of data associated with the Caller

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

Syntax
Defined Values

<pmode> Decimal number corresponding to the selected option.

1 Enables Caller ID with formatted presentation to the

2 Enables Caller ID with unformatted presentation to the

Reporting Current or Selected Values
Command: +VCID?
Response: +VCID: <pmode>
Example: +VCID: 0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VCID=?
Response: +VCID: (<pmode> range)
Example: +VCID: (0-2)

VCID=<pmode>

0 Select Data Mode (Default.) Disable Caller ID

reporting. (Default.)

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),

DTE

+VRID - Report Retrieved Caller ID (CID)

This command reports the data associated with the Caller ID services in the Incoming
Call Line ID (ICLID) data format for the last received call.

Syntax
Defined Values

<pmode> Decimal number corresponding to the selected option.

1 Reports Caller ID with unformatted presentation to the

2
Reporting Supported Range of Parameter Values
Command: +VRID=?
Response: +VRID: (<pmode> range)
Example: +VRID: (0,1)

+VRID=<pmode>

0 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),

DTE.

Page 39

\N - Operating Mode

This command controls the preferred error correcting mode to be negotiated in a
subsequent data connection. This command is affected by the OEM firmware
configuration.

AT Commands

Syntax
Defined Values

<mode> Decimal number which corresponds to the selected mode.

1 Serial interface selected - Selects direct mode and is

2 Parallel interface selected - Same as \N0.
3 Selects reliable (error-correction) mode. The modem

4 Selects auto reliable mode. This operates the same as

5 Selects LAPM error-correction mode. Failure to make

6 Selects MNP error-correction mode. Failure to make an

Result Codes

ERROR Otherwise.

\N<mode>

OK <mode> = 0 to 5.

0 Selects normal speed buffered mode (disables error-

correction mode). (Forces &Q6.)

equivalent to &M0, &Q0 mode of operation. (Forces
&Q0.)

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.)

\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.)

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.

MNP error-correction connection results in the modem
hanging up. (Forces &Q5, S36=4, and S48=128.)

I - Identification

This command causes the modem to reports the requested result according to the
command parameter.

Syntax
Defined Values

<value> Decimal number corresponding to the selected information.

1 Reports the least significant byte of the stored

2 Reports "OK".

3 Reports identification codes.

I<value>

0 0 Reports product code, e.g., “56000”.

checksum in decimal. Reports 255 if the prestored
checksum value is FFh.

For the SmartACFL, SmartACF, and SC56D, the codes
are in the form RevisionName-Modulation_Model, where:
RevisionName = product family name_firmware version,
i.e., ACF3. The firmware version is in the form VX.XXX.

Page 40

Example: ACF3_V1.000
Modulation = V90, V34, or V32 for V.92/V.90, V.34, or
V.32bis, respectively.
Model = Identifies RAM/ROM configuration.

For the SmartSCM, the codes are in the form
RevisionName-Modulation, where:
RevisionName = masked firmware code version.
Example: P2109
Modulation = V90, V34, or V32 for V.90, V.34, or V.32bis,
respectively.

Examples:
ACF3_V1.000-V90_P21_FSH
P2109-V90

Note: If RPI+ is enabled (see +Hn), “ROCKWELL RPI
(TM) MODEM+01” is appended.

4 Reports OEM defined identifier string in either Hayes-

compatible binary format (default) or ASCII format
(selectable by ConfigurACE), e.g.:

a007040284C6002F
bC60000000
r1005111151012000

3000111170000000
5 Reports Country Code parameter (see +GCI).
6 Reports modem data pump model and internalcode

revision. Example:

“RCV56DPF-PLL L8773A Rev 14.00/34.00”.
7 Reports “OK”.

Result Codes

ERROR Otherwise.

OK <value> = 0 - 7.

AT Commands

+GMI - Request Manufacturer Identification

This command causes the modem to report the modem product manufacturer.

Syntax
Typical Response

+GMI: CONEXANT

+GMI9 - Request Conexant Identification

+GMI

OK

This command causes the modem to report CONEXANT ACF identification. The
response cannot be modified using ConfigurACE.

Syntax
Typical Response

+GMI9: CONEXANT ACF

+GMI9

OK

Page 41

+GMM - Request Model Identification

This command causes the modem to report the modem product.

AT Commands

Syntax
Typical Response

+GMM: V90

+GMM

+GMR - Request Revision Identification

This command causes the modem to report the modem version, revision level or date.
This is the same as the I3 command.

Syntax
Typical Response

+GMR: P2109-V90

+GCAP - Request Complete Capabilities List

+GMR

OK

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.

Syntax
Example Responses

+GCAP: +FCLASS, +MS, +ES, +DS,

Where:

+FCLASS T.class1, +F (Class 1 Facsimile modem Control)
+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)

+GCAP

for a data modem that supports all capabilities listed

+GCI - Country of Installation

This extended syntax command selects and indicates the country 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.

Syntax
Defined Values

<country_code> 8-bit country code from Annex A of T.35. The value is the

+GCI=<country_code>

hexadecimal equivalent of the T.35 code, with bit 8 treated as
the most significant bit and bit 1 treated as the least significant
bit.

Page 42

AT Commands

The supported countries are:

Country Code Country Code Country Cod

e

Australia 09 Hong Kong 50 Norway 82
Austria 0A Hungary 51 Philippines 89
Belgium 0F India 53 Poland 8A
Brazil 16 Ireland 57 Portugal 8B
Bulgaria 1B Israel 58 Russia B8
Canada 20 Italy 59 Singapore 9C
China 26 Japan 00 South Africa 9F
Czech and
Slovak Federal
Republic
Denmark 31 Luxembourg 69 Sweden A5
Finland 3C Malaysia 6C Switzerland A6
France 3D Mexico 73 Taiwan FE
Germany 42 Netherlands 7B United Kingdom B4
Greece 46 New Zealand 7E United States B5

2E Korea 61 Spain A0

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).
Reporting Current or Selected Values
Command: +GCI?
Response: +GCI: <current country_code>
Example: +GCI: 3D The modem is set for France.
Reporting Supported Range of Parameter Values
Command: +GCI=?

Response: +GCI: (<country_code>[,<country_code>[,<country_code].......]]

Example: +GCI: (20,73,B5) The modem can be set for Canada, Mexico

or the United States

&F - Restore Factory Configuration (Profile)

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.

OK

&F[<value>]

0 Restore factory configuration 0.

Syntax
Defined Values

<value> Decimal number corresponding to the selected configuration

1 Restore factory configuration 1.

Result Codes

ERROR If the modem is connected.

&T - Local Analog Loopback Test

Page 43

AT Commands

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.

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 Initiates local analog loopback, V.54 Loop 3. Sets S16

&T[<value>]

0 Terminates test in progress. Clears 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.

&Y - Designate a Default Reset Profile

This command selects which user profile will be used after a hard reset.

Syntax
Defined Values

<value> Decimal number corresponding to the selected profile.

1 The modem will use profile 1.

Result Codes

ERROR If <value> > 1, or if NVRAM is not installed or is not

&Y<value

OK <value> = 0 to 1.

0 The modem will use profile 0.

operational.

&W - Store Current Configuration

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
Zn command or at power up (see &Yn command).

Syntax
Defined Values

<value> Decimal number corresponding to the selected profile.

1 Store the current configuration as profile 1.

Result Codes

ERROR Otherwise.

&W<value>

OK <value> = 0 to 1.

0 Store the current configuration as profile 0.

&Zn=x - Store Telephone Number

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.)

Page 44

AT Commands

Syntax
Defined Values

<value> Decimal number from 0 to 3 corresponding to the selected

<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

&Z<value>

telephone number.

or is not operational..

%7 - Plug and Play Serial Number

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.

Syntax
Example

Result Codes

ERROR Otherwise

%7<8 hex numbers><same 8 hex numbers>

%7<8 hex numbers><same 8 hex numbers>

OK <8 hex numbers><same 8 hex numbers>

To display the stored serial number, issue AT"?<cr>.

%8 - Plug and Play Vendor ID and Product Number

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.

Syntax

Example

Result Codes

ERROR Otherwise

**- Load Flash Memory

&8<3 ASCII characters><4 hex numbers><same 3 ASCII
characters><same 4 hex numbers><cr>

%8<3 ASCII characters><4 hex numbers><same 3 ASCII
characters><same 4 hex numbers><cr>

OK <3 ASCII characters><4 hex numbers><same 3 ASCII

characters><same 4 hex numbers>

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

Page 45

AT Commands

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.

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).

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 an industry standard communications

Page 46

AT Commands

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.

The messages described in Table A-1 may occur during the uploading process:

Table A-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, Re-Load 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

Device successfully
programmed

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

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.

Page 47

DTE-Modem Interface Commands

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

E - Command Echo

The modem enables or disables the echo of characters to the DTE. The parameter value,
if valid, is written to S14 bit 1.

AT Commands

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 Enables command echo. (Default.)

Result Codes

ERROR Otherwise.

E<value>

OK <value> = 0 or 1

0 Disables command echo.

Q - Quiet Results Codes Control

The command enables or disables the sending of result codes to the DTE. The parameter
value, if valid, is written to S14 bit 2.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 Disables result codes to the DTE.

Result Codes

ERROR Otherwise.

V - Result Code Form

Q<value>

OK <value> = 0 or 1

0 Enables result codes to the DTE. (Default.)

This command selects the sending of short-form or long-form result codes to the DTE.
The parameter, if valid, is written to S14 bit 3.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 Enables long-form (verbose) result codes. (Default.)

Result Codes

ERROR Otherwise.

V<value>

OK <value> = 0 or 1

0 Enables short-form (terse) result codes. Line feed is

not issued before a short-form result code.

Page 48

AT Commands

W - Connect Message Control

This command, along 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 (see Table A-2). 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.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 Upon connection, the modem reports the modulation,

2 Upon connection, the modem the DCE speed (e.g.,

Result Codes

ERROR Otherwise.

W<value>

OK <value> = 0 or 1

0 Upon connection, the modem reports only the DTE

speed (e.g., CONNECT 19200) Subsequent responses
are disabled. (Default.

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

CONNECT 14400). Subsequent responses are
disabled.

X - Extended Result Codes

This command 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. 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. Table A-2
indicates the messages which are enabled for each X value.

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.

Page 49

AT Commands

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 Disables reporting of busy tones unless forced

2 Disables reporting of busy tones unless forced

3 Enables reporting of busy tones; send only OK,

4 Enables reporting of busy tones; send all messages.

Result Codes

ERROR Otherwise.

X<value>

OK <value> = 0 to 4.

0 0 Disables reporting of busy tones unless forced

otherwise by country requirements; send only OK,
CONNECT, RING, NO CARRIERERROR, 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

otherwise by country requirements; send only OK,
CONNECT, RING, NO 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 selected and dial tone is not
detected, N CARRIER will be reported instead of NO
DIAL TONE. The value 100b is written to S22 bits 6 5,
and 4, respectively

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 value101b is written to S22 bits
6, 5, and 4, respectively.

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.

The value 111b is written to S22 bits6, 5, and 4,
respectively. (Default.)

Page 50

Table A-2. Result Codes

AT Commands

Short
Form
0 1 2 3 4

+F4 +FCERROR X X X X X

0 OK X X X X X
1 CONNECT X X X X X
2 RING X X X X X
3 NO CARRIER X X X X X
4 ERROR X X X X X
5 CONNECT 1200 1 X X X X
6 NO DIAL TONE 3 3 X X X
7 BUSY 3 3 3 X X
8 NO ANSWER X X X X X

9 CONNECT 600 1 X X X X
10 CONNECT 2400 1 X X X X
11 CONNECT 4800 1 X X X X
12 CONNECT 9600 1 X X X X
13 CONNECT 7200 1 X X X X
14 CONNECT 12000 1 X X X X
15 CONNECT 14400 1 X X X X
16 CONNECT 19200 1 X X X X
17 CONNECT 38400 1 X X X X
18 CONNECT 57600 1 X X X X
19 CONNECT 115200 1 X X X X
20 CONNECT 230400 X X X X X

21

23

24 DELAY 4 4 4 4 X
32 BACKLISTED 4 4 4 4 X
33 FAX X X X X X
35 DATA X X X X X
40 +MRR: 300 X X X X X
44 +MRR: 1200/75 X X X X X
45 +MRR: 75/1200 X X X X X
46 +MRR: 1200 X X X X X
47 +MRR: 2400 X X X X X
48 +MRR: 4800 X X X X X
49 +MRR: 7200 X X X X X
50 +MRR: 9600 X X X X X
51 +MRR: 12000 X X X X X
52 +MRR: 14400 X X X X X
53 +MRR: 16800 X X X X X
54 +MRR: 19200 X X X X X
55 +MRR: 21600 X X X X X
56 +MRR: 24000 X X X X X
57 +MRR: 26400 X X X X X
58 +MRR: 28800 X X X X X
59 CONNECT 16800 1 X X X X
61 CONNECT 21600 1 X X X X
62 CONNECT 24000 1 X X X X Note 2
63 CONNECT 26400 1 X X X X Note 2
64 CONNECT 28800 1 X X X X Note 2

Long Form n Value in ATXn Command Notes

CONNECT
75TX/1200RX
CONNECT
1200TX/75RX

1 X X X X

1 X X X X

Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2

Page 51

Table A-2. Result Codes (Continued)

AT Commands

Short
Form
0 1 2 3 4

66 +DR: ALT X X X X X
67 +DR: V42B X X X X X
69 +DR: NONE X X X X X
70 +ER: NONE X X X X X
77 +ER: LAPM X X X X X
78 +MCR: 31200 X X X X X Note 2
79 +MCR: 33600 X X X X X Note 2
80 +ER: ALT X X X X X

81

83 LINE IN USE X X X X X
84 CONNECT 33600 1 X X X X Note 2

91 CONNECT 31200 1 X X X X Note 2
134 +MCR: B103 X X X X X
135 +MCR: B212 X X X X X
136 +MCR: V21 X X X X X
137 +MCR: V22 X X X X X
138 +MCR: V22B X X X X X
139 +MRR: V23 X X X X X
140 +MCR: V32 X X X X X
141 +MCR: V32B X X X X X
142 +MCR: V34 X X X X X Note 3
144 +MCR: K56 X X X X X Note 3
145 +MCR: V90 X X X X X Note 3
150 +MCR: 32000 X X X X X Note 3
151 +MRR: 34000 X X X X X Note 3
152 +MRR: 36000 X X X X X Note 3
153 +MRR: 38000 X X X X X Note 3
154 +MRR: 40000 X X X X X Note 3
155 +MRR: 42000 X X X X X Note 3
156 +MRR: 44000 X X X X X Note 3
157 +MRR: 46000 X X X X X Note 3
158 +MRR: 48000 X X X X X Note 3
159 +MRR: 50000 X X X X X Note 3
160 +MRR: 52000 X X X X X Note 3
161 +MRR: 54000 X X X X X Note 3
162 +MRR: 56000 X X X X X Note 3
165 CONNECT 32000 X X X X X Note 3
166 CONNECT 34000 X X X X X Note 3
167 CONNECT 36000 X X X X X Note 3
168 CONNECT 38000 X X X X X Note 3

Long Form n Value in ATXn Command Notes

+ER: ALT­CELLULAR

X X X X X

Page 52

Table A-2. Result Codes (Continued)

AT Commands

Short
Form

0 1 2 3 4

169 CONNECT 40000 X X X X X Note 3
170 CONNECT 42000 X X X X X Note 3
171 CONNECT 44000 X X X X X Note 3
172 CONNECT 46000 X X X X X Note 3
173 CONNECT 48000 X X X X X Note 3
174 CONNECT 50000 X X X X X Note 3
175 CONNECT 52000 X X X X X Note 3
176 CONNECT 54000 X X X X X Note 3
177 CONNECT 56000 X X X X X Note 3
178 CONNECT 230400 X X X X X
180 CONNECT 28000 X X X X X Note 3
181 CONNECT 29333 X X X X X Note 3
182 CONNECT 30667 X X X X X Note 3
183 CONNECT 33333 X X X X X Note 3
184 CONNECT 34667 X X X X X Note 3
185 CONNECT 37333 X X X X X Note 3
186 CONNECT 38667 X X X X X Note 3
187 CONNECT 41333 X X X X X Note 3
188 CONNECT 42667 X X X X X Note 3
189 CONNECT 45333 X X X X X Note 3
190 CONNECT 46667 X X X X X Note 3
191 CONNECT 49333 X X X X X Note 3
192 CONNECT 50667 X X X X X Note 3
193 CONNECT 53333 X X X X X Note 3
194 CONNECT 54667 X X X X X Note 3
195 +MRR: 28000 X X X X X Note 3
196 +MRR: 29333 X X X X X Note 3
197 +MRR: 30667 X X X X X Note 3
198 +MRR: 33333 X X X X X Note 3
199 +MRR: 34667 X X X X X Note 3
200 +MRR: 37333 X X X X X Note 3
201 +MRR: 38667 X X X X X Note 3
202 +MRR: 41333 X X X X X Note 3
203 +MRR: 42667 X X X X X Note 3
204 +MRR: 45333 X X X X X Note 3
205 +MRR: 46667 X X X X X Note 3
206 +MRR: 49333 X X X X X Note 3
207 +MRR: 50667 X X X X X Note 3
208 +MRR: 53333 X X X X X Note 3
209 +MRR: 54667 X X X X X Note 3

Notes:

1. An 'x' in a column indicates that the message (either the long form if verbose, or the value only for short
form) will be generated when that particular value of 'n' (shown at the top of the column) has been
selected by the use of ATXn. If the column is blank, then no message will be generated for that x
option. A numeral indicates which less explicit message (verbose or short form) will be output for that X
option.

2. RC336 and RC56 modems only.

3. 3. RC56 modems only

Long Form N Value in ATXn Command Notes

&C - RLSD (DCD) Option

Page 53

AT Commands

The modem controls the RLSD output in accordance with the parameter supplied. The
parameter value, if valid, is written to S21, bit 5.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 RLSD follows the state of the carrier. (Default.)

Result Codes

ERROR Otherwise.

&C<value>

OK 0 or 1

0 0 RLSD remains ON at all times.

&D - DTR Option

This command 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.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1

2

3

&D<value>

0 DTR drop is interpreted according to the current &Qn

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.
R drop is interpreted according to the current &Qn
ting 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 drop causes the modem to hang

up. Auto-answer is inhibited.
R drop is interpreted according to the current &Qn
ting as follows:

&Q0 through &Q6: DTR drop causes the modem

to hang up. Auto-answer is inhibited. (Default.)

R drop is interpreted according to the current &Qn setting
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.

Page 54

AT Commands

&K - Flow Control

This command defines the DTE/DCE (terminal/modem) flow control mechanism. The
parameter value, if valid, is written to S39 bits 0, 1, and 2.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

3 Enables RTS/CTS flow control. (Default for data

4 Enables XON/XOFF flow control.
5 Enables transparent XON/XOFF flow control.

Note:

&K<value>

0 Disables flow control.

modem modes.)

Upon reset, both RTS/CTS and
XON/XOFF flow control is enabled for fax

modem and voice modes.

Result Codes

ERROR Otherwise.

OK <value> = 0, 3, 4, or 5.

&M - Asynchronous/Synchronous Mode Selection

This command determines the DTR operating mode. The modem treats the &M
command as a subset of the &Q command.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 Selects synchronous connect mode with async off-line

2 Selects synchronous connect mode with async off-line

3 Selects synchronous connect mode. This mode allows

Result Codes

&M<value>

OK <value> = 0 to 3 (SmartACF and SmartACFL)

0 0 Selects direct asynchronous operation. The

command sequence &M0\N0 selects normal buffered
mode, but the command sequence \N0&M0 selects
direct mode. This is because the \N0 command is
analogous to the &Q6 command. The value 000b is
written to S27 bits 3, 1, and 0, respectively. (See &Q).

command mode. The value 001b is written to S27 bits
3, 1, and 0, respectively. (Serial interface operation
only.) (SmartACF and SmartACFL only.)

command mode. Same as &M1 except that &M2
enables DTR dialing of directory slot 0. The modem will
disconnect if DTR is OFF for more than the period in
S25 (in units of hundredths of a second): the data
connection will be synchronous. The value 010b is
written to S27 bits 3, 1, and 0, respectively. (Serial
interface operation only.) (SmartACF and SmartACFL
only.)

DTR to act as a talk/data switch. The call is manually
initiated while DTR is inactive. When DTR becomes
active, the handshake proceeds in originate or answer
mode according to S14 bit 7. The value 011b is written
to S27 bits 3, 1, and 0, respectively. (Serial interface
operation only.) (SmartACF and SmartACFL only.)

Page 55

AT Commands

OK <value> = 0 (SmartSCM

ERROR Otherwise.

&Q - Sync/Async Mode

This command is an extension of the &M command and is used to control the connection
modes permitted. It is used with S36 and S48. (Also, see \N.)

NOTE: When the &Q0 to &Q3 command is issued to select the mode, the subsequent
connect message will report the DCE speed regardless of the W command and S95
settings.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 Selects synchronous connect mode with async off-line

2 Selects synchronous connect mode with async off-line

3 Selects synchronous connect mode with async off-line

4 The modem will try to negotiate an error-corrected link.

5 Selects asynchronous operation in normal mode

Result Codes

ERROR Otherwise.

&Q<value>

OK <value> = 0 to 3, 5, or 6 (SmartACF and SmartACFL only)
OK <value> = 0, 5, or 6 (SmartSCM only)

0 0 Selects direct asynchronous operation. The value

000b is written to S27 bits 3, 1, and 0, respectively.
See &M0.

command mode. The value 001b is written to S27 bits
3, 1, and 0, respectively. See &M1. (Serial interface
operation only.) (SmartACF and SmartACFL only.)

command mode and enables DTR dialing of directory

0. The value 010b is written to S27 bits 3, 1, and 0,
respectively. See &M2. (Serial interface operation
only.) (SmartACF and SmartACFL only.)

command mode and enables DTR to act as Talk/Data
switch. The value 011b is written to S27 bits 3, 1, and
0, respectively. See &M3. (Serial interface operation
only.) (SmartACF and SmartACFL only.)

The modem can be configured using S36 to determine
whether a failure will result in the modem returning on­hook or will result in fallback to an asynchronous
connection. The value 101b is written to S27 bits 3, 1,
and 0, respectively. (Default.)

(speed buffering). The value 110b is written to S27 bits
3, 1, and 0, respectively.

Page 56

AT Commands

&R - RTS/CTS Option

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.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 In sync mode, CTS is always ON (RTS transitions are

Result Codes

ERROR Otherwise.

&R<value>

OK <value> = 0 or 1.

0 0 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.

ignored). tracks the state of RTS; In async mode, CTS
is normally ON and will turn OFF only if required by
flow control.

&S - DSR Override

This command selects how the modem will control DSR. The parameter value, if valid, is
written to S21, bit 6.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

&1 DSR will become active after answer tone has been

Result Codes

ERROR Otherwise.

&S<value>

&0 DSR will remain ON at all times. (Default.)

detected and inactive after the carrier has been lost.

OK <value> = 0 or 1.

&X - Select Synchronous Clock Source

Selects the source of the transmit clock for the synchronous mode of operation. The
parameter value, if valid, is written to S27, bits 4 and 5.

In asynchronous mode, the transmit and receive clocks are turned OFF. In synchronous
mode, the clocks are turned ON with the frequency of 1200 Hz or faster corresponding to
the speed that is selected for modem operation.

Syntax
Defined Values

<value> Decimal number corresponding to the option.

1 Selects external timing. The local DTE sources the

&X<value>

0 Selects internal timing. The modem generates the

transmit clock signal and applies it to the TXCLK output
at the serial interface.

Page 57

AT Commands

transmit clock signal on the XTCLK input of the serial
interface. The modem applies this clock to the TXCLK
output at the serial interface.

2 Selects slave receive timing. The modem derives the

transmit clock signal from the incoming carrier and
applies it to the TXCLK output at the serial interface.

Result Codes

OK <value> = 0 to 2.

+IPR - Fixed DTE Rate

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.

Syntax
Defined Values

<rate>

Reporting Current or Selected Values
Command:+IPR? +GCI?
Response: +IPR: <rate>
Example 1: +IPR: 0 For automatic rate detection.
Example 2: +IPR: 115200 For 115200 bps.
Reporting Supported Range of Parameter Values
Command:+IPR? +GCI?
Response: +IPR: (<rate> range)
Example: +IPR:

+IPR=<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

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

230400)

Page 58

AT Commands

+IFC - DTE-Modem Local Flow Control

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

Syntax
Defined Values

<modem_by_DTE> Specifies the method to be used by the DTE to control the

1 XON/XOFF on transmitted data (XON/XOFF on

2 Circuit 133 (Ready for Receiving). (Default.)
DC1/DC3 on circuit 103 (Transmitted Data) with

<DTE_by_modem> Specifies the method to be used by the modem to control the

1 XON/XOFF on received data.
2 CTS/RTS. (Default.)
Reporting Current or Selected Values
Command: +IFC?
Response: +IFC:<modem_by_DTE>,<DTE_by_modem>
Example: +IFC: 2,2 For the defaults.
Reporting Supported Range of Parameter Values
Command: +IFC?
Response: +IFC: (<modem_by_DTE> range),(<DTE_by_modem>

Example: +IFC: (0-3),(0-2)

+IFC=[<modem_by_DTE>[,<DTE_by_modem>]]

flow of received data from the modem.

0 None.

transmit data); do not pass XON/XOFFcharacters
to the remote modem.

DC1/DC3 characters being passed through to the
remote DCE in addition to being acted upon for
local flow control

flow of transmitted data from the DTE.

0 None.

range)

+ILRR - DTE-Modem Local Rate Reporting

This extended-format numeric parameter controls whether or not the extended-format
+ILRR:<rate> information text is transmitted from the modem to the DTE

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 Enables reporting of local port rate (+ILRR: is

Reporting Current or Selected Values
Command: +ILRR?
Response: +ILRR: <current value>
Example: +ILRR: 0 For the default setting
Reporting Supported Range of Parameter Values
Command: +ILRR=?

+ILRR=<value>

0 Disables reporting of local port rate (+ILRR: is not

transmitted).(Default.)

transmitted).

Page 59

AT Commands

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

Reported Rate

The <rate> reported represents the current (negotiated or renegotiated) DTE­modem 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 (auto-detected from the previous
command line).

Syntax
Defined Values

Example:

+ILRR: <rate>[,<rx_rate>]

<rate> Decimal value representing Decimal value representing the

current (negotiated or renegotiated) DTE-modem rate:

0-9, 300, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 115200, or 230400

<rx_rate> Optional decimal value reporting the RXD rate, if it is different

from the TXD rate:

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

+ILRR: 19200

Call Control

D - Dial

This command 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

Page 60

AT Commands

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.

Syntax
Defined Values

<string> Character string corresponding to the selected option(s).

* The 'star' digit (tone dialing only).

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

P Select pulse dialing: pulse dial the numbers that

T Select tone dialing: tone dial the numbers that

R This command will be accepted, but not acted on.
S=n Dial the number stored in the directory (n = 0 to 3).

D<string>

0-9

# The 'gate' digit (tone dialing only).

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).

follow until a "T" is encountered. Affects current
and subsequent dialing. Some countries prevent
changing dialing modes after the first digit is
dialed.

follow until a "P" is encountered. Affects current
and subsequent dialing. Some countries prevent
changing dialing modes after the first digit is
dialed.

(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 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.

DTMF digits 0 to 9.

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AT Commands

& 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.

T - Set Tone Dial Default

This command 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

P - Set Pulse Dial Default

OK

This command 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.)

Page 62

This command may not be permitted in some countries.

AT Commands

Result Code

OK

A - Answer

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.)

H - Disconnect (Hang-Up)

This command initiates a hang up sequence.

This command may not be available for some countries due to PTT restrictions.

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 If on-hook, the modem will go off-hook and enter

Result Codes

ERROR Otherwise.

H<value>

OK <value> = 0 or 1

0 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.

command mode. For US models, the modem will
remain off-hook. For W-class models, the modem will
return on-hook after a period of time determined by S7.

O - Return to On-Line Data Mode

This command determines how the modem will enter the on-line data mode. If in the on-

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AT Commands

line command mode, the modem enters the on-line data mode with or without a retrain. If

in the off-line command mode (no connection), the modem reports ERROR.

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 Enters on-line data mode with a retrain before returning

5 Renegotiate rate up one speed (used for diagnostic

Result Codes

ERROR Otherwise or if not connected.

O<value>

OK <value> = 0 to 5 and a connection exists.

0 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 (+++).

to on-line data mode.

2 Fast retrain without speed change (used for diagnostic

purpose only).

3 Renegotiate rate without speed change (used for

diagnostic purpose only.

4 Renegotiate rate down one speed (used for diagnostic

purpose only).

purpose only).

L - Speaker Volume

This command sets the speaker volume control. The parameter value, if valid, is written

to S22, bits 0 and 1.

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 Low volume. (Default.)

Result Codes

ERROR Otherwise.

L<value>

OK <value> = 0 to 3.

0 Low volume.

2 Medium volume.
3 High volume.

M - Speaker Control

This command selects when the speaker will be on or off. The parameter value, if valid,

is written to S22, bits 2 and 3.

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 Speaker is on during call establishment, but off when

Result Codes

M<value>

0 Speaker is always off.

receiving carrier. (Default.)

2 Speaker is always on.

3 Speaker is off when receiving carrier and during

dialing, but on during answering.

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AT Commands

OK <value> = 0 to 3.

ERROR Otherwise.

&G - Select Guard Tone

This command 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.

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 Disables guard tone.

This command may not be permitted in some countries.

Result Codes

ERROR Otherwise.

&G<value>

OK <value> = 0 to 2.

0 Disables guard tone. (Default.)

2 Selects 1800 Hz guard tone.

&P - Select Pulse Dial Make/Break Ratio

This command determines the make/break ratio used during pulse dialing. It is only
effective if the appropriate bit to enable this command is set through the ConfigurACE
program. If enabled, it will override the make/break ratios in the OEM parameters in
ConfigurACE. The default is country-dependent. The parameter value, if valid, is
written to S28, bits 3 and 4.

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 Selects 33%-67% make/break ratio at 10 pulses per

Result Codes

ERROR Otherwise.

&P<value>

OK <value> = 0 to 3.

0 Selects 39%-61% make/break ratio at 10 pulses per

second. (Default.)

second.

2 Selects 39%-61% make/break ratio at 20 pulses per

second.

3 Selects 33%-67% make/break ratio at 20 pulses per

second.

&V - Display Current Configuration and Stored Profiles

This command 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 Codes

OK

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AT Commands

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

&V1 - Display Last Connection Statistics

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

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AT Commands

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 = K56flex)
Second byte: Octet 14 (Licensee code: 81 = Conexant)
Third byte: Octet 15 (manufacturer's product capabilities)
Fourth byte: Octet 16 (K56flex 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

\V - Single Line Connect Message Enable

This command enables or disables the single line connect message format as follows:

Syntax
Defined Values

<value> Decimal number corresponding to the selected option.

1 Connect messages are displayed in the single line

When single line connect messages are enabled, there are no CARRIER,
PROTOCOL (+ER:), or COMPRESSION (+DR:) messages apart from the fields
described below.
The single line connect message format is:

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

Where:

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

\V<value>

0 Connect messages are controlled by the command

settings X, W, and S95.

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.

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AT Commands

Modulation = “V92” for V.92 modulation.

“V90” for V.90 modulation.

“K56” for K56flex 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.

%L - Report Line Signal Level

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

%Q - Report Line Signal Quality

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

Result Codes

ERROR If not connected, or connected in 300 bps, V.23, or fax modes.

015

OK If connected.

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AT Commands

*B - Display Blacklisted Numbers

This command requests the modem to return a list of blacklisted numbers to the DTE.
The format of the response is shown by the example below. Permanently forbidden
numbers as defined by country requirements will not appear on this list. If no numbers
are blacklisted, only the OK result code is issued.

Syntax
Example

*B

NO. - PHONE NUMBER -------

-----------------------------­1; 4175537660
2; 8288924961
3; 3887278862
4; 3124839442
5; 6284664

OK

*D - Display Delayed Numbers

This command causes the modem to send a list of the delayed numbers together with the
delay associated with each. The modem will return a list of delayed telephone numbers as
defined in the *B command. The format of the response is shown by the example below
(delay times are shown as hours:minutes:seconds). If no numbers are delayed, only the
OK result code is issued.

Syntax
Example

*D

NO. - PHONE NUMBER -DELAY

------ ------------------------------------------­1; 8264734660 2:00:00
2; 7532634661 2:00:00
3; 2587334662 0:02:00
4; 7532651663 0:03:25
5; 7459931664 0:01:45

OK

–PPD= - Extension Pickup Notification through 16550 UART

The –PPD=1 command allows setting of the DDSR (bit 1 of register 6) when an
extension pick-up is detected, and disables all DSR notification. The –PPD=0 command
disables this feature.

This feature is available only on a SmartSCM that is configured for parallel operation.

Page 69

–STE= - Set Telephony Extension

The –STE command enables/disables Line-In-Use, Extension Pickup, and Remote
Hangup detection features.

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

AT Commands

Syntax
Defined Values

<value> Decimal number corresponding to the selected bit-mapped

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) Disable Disable Disable

1 Disable Disable Enable
2 Disable Enable Disable
3 Disable Enable Enable
4 Enable Disable Disable
5 Enable Disable Enable
6 Enable Enable Disable
7 Enable Enable Enable

Reporting Current or Selected Values
Command: -STE?
Response: -STE: <value>
Example: -STE: 4 Remote Hangup enabled, Extension Pickup disabled,

Reporting Supported Range of Parameter Values
Command: -STE=? Show available options.
Response: -STE: 0-7
Example: +ILRR: (0,1)

Result Codes

ERROR Otherwise.

-STE=<value>

options.
The bit fields are defined as follows:

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

and Line-In-Use disabled.

OK <value> = 0-7

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 off­hook 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 register S86=25 (this is also defined for #UD). You must flash
the hook to get a dial tone because the remote server will be retraining.

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AT Commands

If the local handset is picked up while the modem is off-hook, the modem will do a link­disconnect, flash the hook for 1.5 seconds, 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 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.

In voice mode, there is no blocking of ATDT when the line is in use. Also, there is no
automatic hang-up in voice mode as in data mode. There is only the above stated <DLE>
shielding event reporting.

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 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.

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 off-hook 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 off-hook momentarily, go back on­hook, 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

Page 71

AT Commands

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.

Case 2: Modem off-hook, Extension Pick-up

If the modem is connected and another extension goes off-hook, the modem will send a
GSTN Clear down to the remote modem and then immediately hang-up. Due to the noise
possibly being added to the line when a telephone extension is picked-up, a GSTN
Cleardown may or may not successfully be received by the remote mode. If the GSTN
Cleardown is not received successfully by the remote modem, the remote modem may
attempt a retrain until the retrain fails and the remote modem drops the line. In any case,
the modem will send a NO CARRIER message to the DTE immediately after sending
the GSTN Cleardown. A result code of 25 will be left in the S86 register.

Because the extension is off-hook, the modem cannot flash the hook for the central office
to generate a dial tone. In this case, you must flash the extension handset to obtain a 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 issues a <DLE>P
to the DTE. The application software should then hang up the line (VLS=0).

Remote Hang-up (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 issues a

<DLE>P to the DTE. The application software should then hang up the line (VLS=0).

Page 72

Examples

AT Commands

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

CONNECT

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

AT-STE=3
ATDT555-1212

NO DIAL TONE

Modem is connected in data mode and an extension goes off-hook

AT-STE=2
ATDT555-1212
CONNECT
NO CARRIER Extension is picked up, GSTN
Cleardown sent
ATS86=?
025

Modem goes off-hook

Modem goes off-hook

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 connected in data mode and the LOCAL HANDSET goes off-hook

AT-STE=7
ATDT555-1212 5 sec delay
CONNECT
NO CARRIER Local handset goes off-hook,
GSTN Cleardown sent, and remote modem goes on-hook
ATS86=?
025
500ms after no carrier a dial tone is
heard on the local handset

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AT Commands

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

AT-STE=2

AT+FCLASS=8

OK

<DLE>h Local handset on-hook

<DLE>R Ring

AT+VLS=1

OK

AT+VSM=1,7200,0,0

T+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
OK
ATDT5551212
CONNECT

Sometime later, the user picks up phone
NO CARRIER
ATS86?
25
OK

Delay 30 seconds
ATDT5551212
LINE-IN-USE

Try again some time later user
hangs up the phone
CONNECT

Page 74

Modulation Control Commands

+MS - Modulation Selection

This extended-format compound parameter controls the manner of operation of the
modulation capabilities in the modem. It accepts six subparameters.

AT Commands

Syntax

Table A-3. +MS Command Supported Rates

Modulation <carrier> Possible (<min_rx_rate>,

Bell 103 B103 300
Bell 212 B212 1200 Rx/75 Tx or 75

V.21 V21 300
V.22 V22 1200
V.22bis V22B 2400 or 1200
V.23 V23C 1200
V.32 V32 9600 or
V.32bis V32B
V.34 V34
K56flex K56
V.90 V90
V.90 downstream V92
V.92 upstream V92
Note: Some <carrier> values may not be supported by certain model models. For
example, modem models supporting V92 may not support K56.

<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 A-3.

<min_rx_rate>,
(<min_tx_rate>), and
<max_tx_rate>) Rates
(bps)

Rx/1200 Tx

Page 75

AT Commands

Defined Values

<carrier> A string which specifies the preferred modem carrier to use in

<automode> A numeric value which enables or disables automatic

<min_rx_rate>

<max_rx_rate>

<min_tx_rate>

<max_tx_rate>

Reporting Current or Selected Values
Command: +MS?
Response: +MS:<carrier>,<automode>,<min_tx_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.
Reporting Supported Range of Parameter Values
Command: +MS=?
Response: +MS: (< carrier> range),(<automode> range),(<min_tx_rate>

Example 1: +MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,

Example 2: +MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,

Result Codes

ERROR Otherwise.

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 A-3.

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

0 = Automode disabled.
1 = Automode enabled. (Default.)

Numeric values which specify the lowest (<min_rx_rate>) and

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 A-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_rx_rate>) and highest (<max_rx_rate>) rate
supported by the selected carrier.)
Numeric values which specify the lowest (<min_tx_rate>) and

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 3-3.
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.)

<max_tx_rate>,<min_rx_rate>,<max_rx_rate>

range), (<max_tx_rate> range), (<min_rx_rate> range),
(<max_rx_rate> range)

K56,V90),(0,1),(300-33600),(300-33600),(300-56000),(300-

56000)

V90,V92),(0,1),(300-33600),(300-33600),(300-56000),(300-

56000)

OK Valid subparameter string

Page 76

AT Commands

+MR - Modulation Reporting Control

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).

Syntax
Defined Value

<value> A decimal number corresponding to the selected option:

1 Enables reporting of modulation connection (+MCR:

2 Enables reporting of modulation connection (+MCR:

Reporting Current or Selected Values
Command: +MR?
Response: +MR: <current value>
Example: +MR: 0 For default setting
Reporting Supported Range of Parameter Values
Command: +MR=?
Response: +MR: (<value>range)
Example: +MR: (0-2)

+MR=[<value>]

0 Disables reporting of modulation connection (+MCR:

and +MRR: are not transmitted). (Default.)

and +MRR: are transmitted with tx rate, rx rate).

and +MRR: are transmitted with rx rate only).

+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
K56 For K56flex
V90 For V.90
V92 For V.92

Page 77

AT Commands

+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

%E - Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall

Forward

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.

Syntax
Defined Value

<value> Decimal number corresponding to the selected option.

1 Enable line quality monitor and auto-retrain.
2 Enable line quality monitor and fallback/fall forward.

Result Codes

ERROR Otherwise.

%E<value>

OK <value> = 0, 1, or 2.

0 Disable line quality monitor and auto-retrain.

(Default.)

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.32bis/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.

Page 78

AT Commands

%U - Select µ-Law or A-Law Codec Type

This command selects µ-Law or A-Law codec type for V.90 and K56flex modulation.
This command also stores the selected setting directly to NVRAM. The default value is
country specific.

Syntax
Defined Value

<value> Decimal number corresponding to the selected option.

1 Selects A-Law.

Result Codes

ERROR Otherwise.

%U<value>

OK <value> = 0 or 1

0 Selects µ-Law.

B - CCITT or Bell

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.

Syntax
Defined Value

<value> Decimal number corresponding to the selected option.

1 Selects BELL operation at 300 or 1200 bps during Call

Result Codes

ERROR Otherwise.

B<value>

OK <value> = 0 or 1

0 Selects CCITT operation at 300 or 1200 bps during

Call Establishment and a subsequent connection.
(Default.)

Establishment and a subsequent connection.

Page 79

Error Control Command

+ES - Error Control and Synchronous Mode Selection

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, and optionally
specifies the acceptable fallback mode of operation when the modem is operating as the
answerer. It accepts three numeric subparameters:

AT Commands

Syntax

Defined Value

<orig_rqst> Decimal number which specifies the initial requested mode of

<orig_fbk> Decimal number which specifies the acceptable fallback mode

<ans_fbk> Decimal number which specifies the acceptable fallback mode

+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]
]

operation when the modem is operating as the originator. The
options are:

1 Initiate call with Normal Mode (also referred to

2 Initiate V.42 without Detection Phase. If V.8 is

3 Initiate V.42 with Detection Phase. (Default.)
4 Initiate MNP.
6 Initiate V.80 Synchronous Access Mode when

7 Initiate Frame Tunneling Mode when

of operation when the modem is operating as the originator.

1 LAPM, MNP, or Direct Mode error control

2 LAPM or MNP error control required;

3 LAPM error control required; disconnect if error

4 MNP error control required; disconnect if error

of operation when the modem is operating as the answerer or
specifies V.80 Synchronous Access Mode.

1 Error control disabled, use Normal Mode.
2 LAPM, MNP, or Normal Mode error control

3 LAPM, MNP, or Direct Mode error control

4 LAPM or MNP error control required;

0 Initiate call with Direct Mode.

as Buffered Mode) only.

in use, disable V.42 Detection Phase.

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

connection is complete, and Data Mode is
entered.

0 LAPM, MNP, or Normal Mode error control

optional. (Default.)

optional.

disconnect if error control is not established.

control is not established.

control is not established.

0 Direct Mode.

optional. (Default.)

optional.

disconnect if error control is not established.

Page 80

5 LAPM error control required; disconnect if error

control is not established.

6 MNP error control required; disconnect if error

control is not established.

8 Initiate V.80 Synchronous Access Mode when

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

9 9Initiate Frame Tunneling Mode when

connection is complete, and Data Mode is
entered

Examples

Reporting Current or Selected Values

Command: +ES?
Response: +ES: <orig_rqst>,<orig_fbk>,<ans_fbk>
Example: +ES: 3,0,2 For the default setting.

Reporting Supported Range of Parameter Values
Command: +ES=?
Response: +ES: (<orig_rqst> range),( <orig_fbk> range), (<ans_fbk>

Example: +ES: (0-4,6,7),(0-4),(0-6,8,9)

+ES=6 Enable V.80 Synchronous Access Mode

+ES=6,,8 Enable V.80 Synchronous Access Mode

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

+ES=,, 2 Allow LAPM, MNP, or Normal Mode

+ES=6 Enable V.80 Synchronous Access Mode

originator.

originator.
Enable V.80 Synchronous Access Mode
answerer.

originator and answerer.

Disable V.80 Synchronous Access Mode
originator.

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.

+ES: 6,0,8 For V.80 Synchronous Access Mode originator and
answerer.

range)

AT Commands

+EB - Break Handling in Error Control Operation

This extended-format compound parameter controls the break handling in V.42
operation. It accepts three numeric subparameters:

Syntax

Defined Value

<break_selection> Decimal number 0 specifying that break is to be ignored, i.e.,

<timed> Decimal number 0 specifying that any transmitted V.42 L-

<default_length> Decimal number 0 specifying that break is not delivered to the

Reporting Current or Selected Values

+EB=[<break_selection>[,<timed>[,<default_length>]]
]

not signaled to remote DCE.

SIGNAL will not indicate break signal length

DTE.

Page 81

AT Commands

Command: +EB?
Response: +EB: <break_selection>,<timed>,<default_length><CR>
Example: +EB: 0,0,0 For default settings.
Reporting Supported Range of Parameter Values
Command: +EB=?
Response: +EB: (<break_selection> range),(<timed> range),

(default_length> range)

Example: +EB: (0),(0),(0)

+ESR - Selective Repeat

This extended-format numeric parameter controls the use of the selective repeat (SREJ)
option in V.42.

Syntax

Decimal number 0 specifying that SREJ is not used.
Reporting Current or Selected Values
Command: +ESR?
Response: +ESR: <value>
Example: +ESR: 0 For default setting
Reporting Supported Range of Parameter Values
Command: +ESR?
Response: +ESR: <value>
Example: +ESR: (0)

+ESR=[<value>]

+EFCS - 32-bit Frame Check Sequence

This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame
check sequence (FCS) option in V.42.

Syntax
Defined Value

<value> Decimal number 0 specifying the use of the 16-bit FCS

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

+EFCS=[<value>]

specified in V.42.

+ER - Error Control Reporting

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

+ER: 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 Command).

Page 82

+ER: <value>

Syntax
Defined Value

<value> A decimal number corresponding to the selected error control

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

+ER=[<value>]

option:

1 Error control reporting enabled

0 Error control reporting disabled (no +ER

intermediate result code transmitted). (Default.)

(+ERintermediate result code transmitted).

+ER: <type>

AT Commands

The +ER: <type> reported represents the current (negotiated or renegotiated) modem­modem error control type. If enabled, the intermediate result code is transmitted at the
point during error control negotiation (handshaking) at which the modem has determined
which error control protocol will be used (if any), before the final result code (e.g.,
CONNECT) is transmitted. The format of this result code is:

The +ER intermediate result code, if enabled, is issued after the Modulation report
(+MCR and +MRR) and before the Data Compression Report (+DR).

Syntax
Defined Value

<type> An alphanumeric code corresponding to the selected protocol.

Example
+ER: LAPM

+ER: <type>

LAPM V.42 LAPM protocol is in use.
ALT MNP is in use.

NONE Error control is not in use.

+ETBM - Call Termination Buffer Management

This extended-format compound parameter controls the handling of data remaining in
modem buffers upon call termination. It accepts three numeric subparameters:

Syntax
Defined Value

<pending_TD> Decimal number 0 specifying that disconnect will occur

<pending_RD> Decimal number 0 specifying that disconnect will occur

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

+ETBM=[<pending_TD>[,<pending_RD>[,<timer>]]]

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

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

Page 83

AT Commands

to deliver the buffered data before abandoning the attempt and

discarding remaining data.
Reporting Current or Selected Values
Command: +ETBM?
Response: +ETBM: <pending_TD>,<pending_RD>,<timer>
Example: +ETBM: 0,0,0
Reporting Supported Range of Parameter Values
Command: +ETBM?
Response: +ETBM: (<pending_TD> range),(<pending_RD> range),

(<timer> range)

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

\B - Transmit Break to Remote

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 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.

Syntax
Defined Value

<value> Decimal number corresponding to the selected option.

Result Codes

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.

\B<value>

1-9 Break length in 100 ms units. (Default = 3.) (Non-error

corrected mode only.)

OK If connected in data modem mode.

\K - Break Control

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.

Syntax
Defined Value

<value> Decimal number corresponding to the selected option.

\K<value>

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:

0 Enter on-line command mode, no break sent to the

remote modem.
1 Clear data buffers and send break to remote modem.
2 Same as 0.
3 Send break to remote modem immediately.
4 Same as 0.

5 Send break to remote modem in sequence with

transmitted data. (Default.)

Page 84

Result Codes

ERROR Otherwise.

The second case is where the modem is in the on-line

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:

0 Clear data buffers and send break to remote modem.
1 Clear data buffers and send break to remote

modem.(Same as 0.)
2 Send break to remote modem immediately.
3 Send break to remote modem immediately. (Same as

2.)
4 Send break to remote modem in sequence with data.
5 Send break to remote modem in sequence with

transmitted data. (Default.)
The third case is where a break is received from a remote
modem during a non-error corrected connection:

0 Clears data buffers and sends break to the DTE.
1 Clears data buffers and sends break to the DTE.

(Same as 0.)

2 Send a break immediately to DTE.
3 Send a break immediately to DTE. (Same as 2.)
4 Send a break in sequence with received data to DTE.
5 Send a break in sequence with received data to DTE.

(Same as 4.) (Default.)

OK 0 to 5.

AT Commands

-K - MNP Extended Services

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.

Syntax
Defined Value

<value> Decimal number corresponding to the selected option.

Result Codes

ERROR Otherwise.

-K<value>

0 Disables V.42 LAPM to MNP 10 conversion. (Default.)
1 Enables V.42 LAPM to MNP 10 conversion.
2 Enables V.42 LAPM to MNP 10 conversion; inhibits

MNP Extended Services initiation during V.42 LAPM

answer mode detection phase.

OK 0 or 2.

Page 85

3.2.6 Data Compression Commands

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

+DS - Data Compression

This extended-format compound parameter controls the V.42bis data compression
function if provided in the modem. It accepts four numeric subparameters:

AT Commands

Syntax
Defined Value

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

<compr_neg> Specifies the desired direction(s) of operation of the data

<max_dict> Specifies the maximum number of dictionary entries (2048

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

Reporting Current or Selected Values
Command: +DS?
Response: +DS: <direction>,<compr_neg>,<max_dict>,<max_string>
Example: +DS: 3,0,2048,32 for the defaults and 2048 entry max

Reporting Supported Range of Parameter Values
Command: +DS?
Response: +DS: (<direction> range),(< compr_neg > range), (<max_dict>

Example: +DS: (0,3),(0),(2048),(32)

+DS=[<direction>[,<compr_neg>[,<max_dict>[,<max_string>]]]]

compression function; from the DTE point of view.
0 Negotiated; no compression (V.42bis P0=0).
3 both directions, accept any direction (V.42bis P0=11).

(Default.)

compression function; from the DTE point of view.
0 Do not disconnect if V.42bis is not negotiated by the

remote modem as specified in <direction>.

entries) which should be negotiated (may be used by the DTE

to limit the codeword size transmitted, based on its knowledge

of the nature of the data to be transmitted).

(V.42bis P2).

dictionary.

range),(<max_string> range)

+DS44 - V.44 Compression Select

This extended-format compound parameter controls the V.44 data compression function.

Syntax

Defined Value

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

+DS44=[<direction>[,< compress_negotiation
>[,<capability>[,<max_codewords_tx>
[,<max_codewords_rx>[,<max_string_tx>[,<max_string_rx>[,
<max_history_tx>
[,<max_history_rx>]]]]]]]]]

operation of the data compression function; from the DTE
point of view.

0 Negotiated, no compression.

Page 86

AT Commands

1 Transmit only.
2 Receive only.
3 Both directions, accept any direction. (Default.)

<compress_negotiat

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

<max_codewords_t

<max_codewords_r

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

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

<max_history_tx> Decimal number from 2048 to 4096 that specifies the

<max_history_rx> Decimal number from 2048 to 4096 that specifies the

Reporting Current or Selected Values
Command: +DS44?
Response: +DS44:<direction>,<compression_negotiation>,<capability>,

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

Reporting Supported Range of Parameter Values
Command: +DS44=?
Response: +DS44:(list of supported <direction> values),(list of supported

Decimal number that specifies whether or not the modem

ion>

should continue to operate if the desired result is not
obtained.

0 Do not disconnect if V.44 is not negotiated by the

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

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

as specified in <direction>.

packet method, multi-packet method.
0 Stream method. (Default.)
1 Packet method.
2 Multi-packet method.

Decimal number from 256 to 2048 that specifies the

x>

maximum number of codewords which should be negotiated

in the transmit direction. (Default = 2048.)

Decimal number from 256 to 2048 that specifies the

x>

maximum number of codewords which should be negotiated

in the receive direction. (Default = 2048.)

string length to be negotiated in the transmit direction.

(Default = 32.)

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

= 32.)

maximum size of the history buffer to be negotiated in the

transmit direction. (Default = 4096.)

maximum size of the history buffer to be negotiated in the

receive direction. (Default = 4096.)

<max_codewords_tx>,<max_codewords_rx>,<max_string_tx
>,
<max_string_rx>,<max_history_tx>,<max_history_rx>

default setting.

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)

Page 87

AT Commands

+DR - Data Compression Reporting

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).

Syntax
Defined Value

<value> Decimal number corresponding to the selected option:

Reporting Current or Selected Values
Command: +DR?
Response: +DR: <current value>
Example: +DR: 1 For the default setting.
Reporting Supported Range of Parameter Values
Command: +DR?
Response: +DR: (<value> range)
Example: +DR: (0,1)

+DR=[<value>]

0 Data compression reporting disabled (no +DR result

code transmitted).

1 Data compression reporting enabled (+DR result code

transmitted). (Default.)

+DR: <type> Intermediate Result Code

The +DR: <type> reported represents the current (negotiated or renegotiated) modem­modem 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:

Result Code
Syntax
Defined Value

<type> An alphanumeric code corresponding to the selected option:

Example
+DR: V42B

+DR: <type>

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

Page 88

AT Commands

%C - Enable/Disable Data Compression

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.

Syntax
Defined Value

<value> Decimal number corresponding to the selected option.

Result Codes

ERROR Otherwise.

%C<value>

0 Disables data compression. Resets S46 bit 1.
1 Enables MNP 5 data compression negotiation.

2 Enables V.42bis data compression. Sets S46 bit 1.
3 Enables both V.42bis and MNP 5 data

OK <value> = 0, 1, 2, or 3.

V.8/V.8bis Commands

+A8E - V.8 and V.8bis Operation Controls

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 off-hook. If enabled, V.8 negotiation
does not preclude simultaneous implementation of other negotiation means (e.g., V.8bis,
V.18, V.32bis Annex A).

Resets S46 bit 1.

compression. Sets S46 bit 1. (Default.)

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.8negotiation.

Syntax
Defined Value

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

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

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

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.

indications during modem-controlled V.8 answer negotiation.

1 Decimal number which enables/disables issuance

of +A8x indications during modem-controlled V.8

Page 89

AT Commands

answer negotiation.

5 Enable DCE-controlled V.8 answer negotiation with

+A8x indications.

<v8cf Set the V.8 CI signal call function to the hexadecimal octetXY.

00 (Default.)
21
C1

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

0 Disable V.8bis negotiation.
1 Enable V.8bis negotiation. (Default.)

<cfrange> “<string of values>“. Applicable only for <v8a>=5. Not

supported.

< protrange > “<string of values>“. Applicable only for <v8a>=5. Not

supported.
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.
Reporting Current or Selected Values
Command: +A8E?
Response: +A8E: <v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]
Example: +A8E: 1,1,00,1,0,0 For the defaults
Reporting Supported Range of Parameter Values
Command: +A8E?
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)

+A8I: - CI Signal Indication

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).

Indication
Syntax
Defined Value

<v8cf> A hexadecimal code octet representation of those Call Function

Example

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

+A8I:X YYY

+A8I:<v8cf><CR>

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

CI.

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Synchronous Access Mode Commands

Three commands support Synchronous Access Mode:

 +ES Enables and disables Synchronous Access Mode in the client or central

site modem (see 0)

 +ESA Configures the operation of the Synchronous Access Submode

 +ITF Selects Transmit Flow Control Thresholds

Enabling Synchronous Access Mode enables the use of the 8-bit command characters
defined in Table 9/V.80 of the Draft ITU-T Recommendation V.80 (DATA
COMMUNICATION OVER THE TELEPHONE NETWORK; In-Band DCE Control
and Synchronous Data Modes for Asynchronous DTE).

+ESA - Configure Synchronous Access Submode

AT Commands

The operation of the Synchronous Access sub-Mode is configured by the +ESA
parameter.

This extended-format compound parameter is used to control the manner of operation of
the Synchronous Access Mode in the modem. It accepts six numeric subparameters:

Syntax

Defined Value

<trans_idle> Specifies the bit sequence transmitted by the modem when a transmit

<framed_idle> Specifies the bit sequence transmitted by the modem when a transmit

<framed_un_ov> Specifies the actions undertaken by the modem when a transmit data

<hd_auto> Specifies whether or not, in V.34 half-duplex operation, additional

<crc_type> Specifies the CRC polynomial used while operating in Framed sub-Mode.

+ESA=[<trans_idle>[,<framed_idle>[,<framed_un_ov>[,<hd_auto>[,<crc_
type>[,<nrzi_en> [,<syn1>[,<syn2>]]]]]]]]

data buffer underrun condition occurs, while operating in Transparent
sub-Mode. The options are:

0 In Transparent sub-Mode, modem transmits 8-bit SYN

sequence on idle. Modem receiver does not hunt for
synchronization sequence (default and fixed).

data buffer underrun condition occurs immediately after a flag, while
operating in Framed sub-Mode. The options are:

0 In Framed sub-Mode, modem transmits HDLC flags on idle

(default and fixed).

buffer underrun or overrun condition occurs immediately after a non-flag
octet, while operating in Framed sub-Mode.

0 In Framed sub-Mode, modem transmits abort on underrun in

middle of frame (default).

1 In Framed sub-Mode, DCE transmits a flag on underrun in

middle of frame, and notifies DTE of underrun or overrun.

procedures besides those specified in § 12/V.34 shall be performed by
the modem when switching from primary channel to secondary channel
operation, and vice versa. This subparameter should not be commanded.

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AT Commands

The options are:
0 CRC generation and checking disabled (default).
1 In Framed sub-Mode, the 16-bit CRC is generated by the

modem in the transmit direction, and checked by the modem
in the receive direction.

<nrzi_en> Specifies if Non Return to Zero Inverted (NRZI) encoding is to be used by

the modem for transmit and receive data. The options are:
0 NZRI encoding and decoding disabled (default and fixed).

<syn1>, <syn2> Specifies the octet value(s) to be used while performing character-

oriented framing. <syn1> is to be commanded to 255 (FFh); <syn2> is

not to be commanded.

Reporting Selected Options
The modem reports the selected options in response to the following command:

+ESA?

The response is:

+ESA: <trans_idle>,<framed_idle>,<framed_un_ov>,<hd_auto>,

<crc_type>,<nrzi_en>,<syn1>,<syn2>

Example:

+ESA?
+ESA: 0,0,0, ,0,0,255, For the defaults.

Reporting Supported Options
The modem reports the supported options in response to the following command:

+ESA?

The response is:

+ESA: (list of supported <trans_idle> values), (list of supported

<framed_idle>values),(list of supported <framed_un_ov>
values), (list of supported <hd_auto>
values),(list of supported <crc_type> values), (list of supported
<nrzi_en> values), (list of supported <syn1> values), (list of
supported <syn2> values)

Example:

+ESA?
+ESA: (0),(0),(0-1), ,(0-1),(0),(255),

+H - Enable/Disable RPI

This command enables or disables Conexant Protocol Interface (RPI) processing and sets
the DTE speed.

Syntax
Defined Value

<value> Decimal number corresponding to the selected option.

+H=<value>

0 Disable protocol interface and video ready mode.
1 Enable RPI mode and set DTE speed to

19200bps.

2 Enable RPI mode and set DTE speed to

38400bps.

3 Enable RPI mode and set DTE speed to

57600bps.

11 Enable RPI+ mode. When in RPI+ mode, a link is

established between the modem and the WinRPI
or WinRPI95 host PC software driver to allow the
modem to support protocol (V.42bis/LAP-M/MNP2-

5) connections with a remote modem. This
command should only be used when the WinRPI

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