Multitech MT5634HD16, MT5634HD8 User Manual

MT5634HD8/16 User Guide

MT5634HD8/16 User Guide

P/N 82074700, Revision A

Copyright © 1997 by Multi-Tech Systems, Inc.

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

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

Revision Date Description

A 11/15/97 Manual released.

Multi-Tech, CommPlete, RASExpress, MultiExpress, MultiExpress Fax MultiModem, MultiModemZDX,
MultiCommManager, and the Multi-Tech logo are trademarks of Multi-Tech Systems, Inc. Other
trademarks and trade names mentioned in this publication belong to their respective owners.

Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
[phone] or [phone]
U.S. Fax [phone]
Technical Support [phone]
BBS [phone] or [phone]
Fax Back [phone]
Internet Address: http://www.multitech.com

Federal Communications Commission Statement

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in which case the user will be
required to correct the interference at his own expense.

Warning: Changes or modifications to this unit not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.

FCC Regulations for Telephone Line Interconnection

1. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its

licensees. Unauthorized repairs void registration and warranty. Contact Multi-Tech Systems, Inc. for
details of how to have repairs made.

2. When trouble is experienced, you must disconnect your modem from the telephone company’s jack

to determine the cause of the trouble, and reconnect your modem only when the trouble is
corrected.

3. The modem cannot be connected to pay telephones or party lines.

4. If requested by the telephone company, you must notify them of the following before the

MT5634HD8/16 is installed:

a. The particular phone line (phone number) to which the connection is to be made.

b. The FCC Registration Number. (See your CC9600 Chassis User Guide for specifics.)

c. The manufacturer’s name and model number:

Multi-Tech Systems - Model MT5634HD8 or MT5634HD16

5. If the telephone company notifies you that your device is causing harm, unplug it. The telephone

company may disconnect your service if necessary and also may change its facilities, equipment,
operations or procedures which may affect operation of your equipment. Where practical, the
telephone company must promptly inform you in writing of the temporary disconnect or change in
service, give you the opportunity to make changes allowing uninterrupted service, and inform you of
your rights to bring a complaint to the FCC.

CommPlete Communications Server iii

FCC Fax Warning

The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or
other electronic device to send any message via a telephone fax machine unless such message clearly
contains in a margin at the top or bottom of each page or 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.

See your fax software manual for setup details.

Canadian Limitations Notice

Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of
the maximum number of terminals allowed to be connected to a telephone interface. The termination of a
interface may consist of any combination of devices subject only to the requirement that the sum of the
ringer equivalence numbers of all the devices does not exceed 5.

Notice: The Industry Canada label identifies certificated equipment. This certification means that the
equipment meets certain telecommunications network protective, operational and safety requirements.
Industry Canada does not guarantee the equipment will operate to the user’s satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facilities
of the local telecommunications company. The equipment must also be installed using an acceptable
method of connection. The customer should be aware that compliance with the above conditions may not
prevent degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated
by the supplier. Any repairs or alterations made by the user to this equipment, or equipment
malfunctions, may give the telecommunications company cause to request the user to disconnect the
equipment.

Users should ensure for their own protection that the electrical ground connections of the power utility,
telephone lines and internal metallic water pipe system, if present, are connected together. This precaution
may be particularly important in rural areas.

Caution: Users should not attempt to make such connections themselves, but should contact the
appropriate electric inspection authority, or electrician, as appropriate.

See your CC9600 User Guide for complete Canadian Limitations information.

iv CommPlete Communications Server

v

Table of Contents

1 Introduction

Introduction ...................................................................................................................................................... 2

Manual Organization......................................................................................................................................... 2

LED Indicators................................................................................................................................................... 3

Power Supplies .................................................................................................................................................. 3

Technical Specifications .................................................................................................................................... 4

2 Installation

Introduction ...................................................................................................................................................... 8

Safety Warnings................................................................................................................................................. 8

Pre-Installation Notes ....................................................................................................................................... 9

Installation Procedure....................................................................................................................................... 9

3 AT Commands

Working with AT Commands ..........................................................................................................................12

Modes of Operation .....................................................................................................................................12

Command Structure ....................................................................................................................................12

Command Editing........................................................................................................................................13

Dialing Commands...........................................................................................................................................15

Dial Modifier Commands.................................................................................................................................16

Phone Number Memory Commands...............................................................................................................18

Configuration Storage and Recall Commands.................................................................................................19

Modem Response (Result Code) Commands..................................................................................................19

Online Connection Commands ........................................................................................................................22

RS-232 Interface Commands ...........................................................................................................................24

Error Correction and Data Compression Commands .....................................................................................26

Immediate Action Commands .........................................................................................................................27

Flow Control Commands .................................................................................................................................27

Escape Sequences .............................................................................................................................................29

Diagnostic Commands .....................................................................................................................................31

Speaker Settings................................................................................................................................................31

4 S-Registers

Introduction .....................................................................................................................................................34

S-Registers ........................................................................................................................................................34

Reading and Assigning S-Register Values .......................................................................................................38

Examples of Assigning Values.....................................................................................................................38

Examples of Reading Values .......................................................................................................................39

AT Commands that Affect S-Registers ............................................................................................................39

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Appendix A ASCII Conversion Chart ........................................... 42

Appendix B Dial Pulses and Tones............................................... 43

Appendix C Result Code Summary .............................................. 45

Appendix D S-Register Summary................................................... 47

Appendix E AT Command Summary........................................... 49

Glossary.............................................................................................................. 57

Index....................................................................................................................... 71

vi CommPlete Communications Server

1 Introduction

CommPlete Communications Server 1

MT5634HD8/16 User Guide

Introduction

The Multi-Tech MT5634HD8 and MT5634HD16 are high speed, high density modem cards for the
CommPlete Communications Server. Each MT5634HD8 contains eight integrated 56Kflex modems, and
each MT5634HD16 card contains sixteen integrated 56Kflex modems. Each modem on the card can be
configured independently of the others via RASexpress Software or the CommPlete Communications
Server’s MR9600 controller. The MT5634HD8/16 cards can be used in various combinations according to
the desired segment type; T1, PRI or Dual T1. There are no external connectors.

Three MT5634HD8 card must be installed per T1 segment. With eight modems per card, the CommPlete
Communications Server can support up to 24 simultaneous data line per segment.

One MT5634HD16 card and one MT5634HD8 card must be installed per PRI segment. With sixteen
modems per MT5634HD16 card and eight modems per MT5634HD8 card, the CommPlete
Communications Server can support up to 24 simultaneous data lines per segment. Analog calls are routed
to the MT5634HD16’s modems through a Primary Rate Interface (PRI) card which plugs into the slot next
to the RASCard that controls the segment. ISDN calls are routed to the PRI where its “B” channel(s)
process the call.

Three MT5634HD16 cards must be installed per Dual T1 segment. With sixteen modems per
MT5634HD16 card the CommPlete Communications Server can support up to 48 simultaneous data lines
per segment.

The MT5634HD8/16 operates as an enhanced ITU-T V.34 dial-up modem with a maximum K56flex
speeds, and is a fully digital K56flex server. As such, it includes the advanced features of other popular
Multi-Tech standalone modems.

The MT5634HD8/16 is registered by the FCC for direct connection to the public telephone networks. No
Data Access Arrangements (DAAs) are required.

The MT5634HD8/16 is fully compatible with the standard AT command set, and is therefore compatible
with all popular communications software packages.

This user guide will help you to install, configure, test, and use the MT5634HD8/16.

Manual Organization

Chapter 1 Introduction

This chapter describes the MT5634HD8/16 and its LED indicators, gives its technical specifications, and
provides a guide to the organization of the manual.

Chapter 2 Installation

This chapter describes how to install the MT5634HD8/16 into the CC9600 chassis.

Chapter 3 Command Mode Operation

This chapter provides an introduction to MT5634HD8/16 command mode fundamentals, followed by a
detailed explanation of each AT command, providing examples where applicable.

Chapter 4 S-Registers

This chapter describes the MT5634HD8/16’s S-registers, which are used to store various modem options.

2 CommPlete Communications Server

Appendix A ASCII Conversion Chart

Appendix B Dial Pulses and Tones

Appendix C Result Code Summary

Appendix D S-Register Summary

Appendix E AT Command Summary

Appendix F Remote Configuration

Glossary

Index

LED Indicators

The MT5634HD8 has 16 LED indicators (the MT5634HD16 has 32 LEDs) on the front panel, two for each
modem:

CD Carrier Detect. The CD LED lights when the modem detects a valid carrier signal.

1 Introduction

OH Off Hook/Out of Service. The OH LED lights when the modem is off hook, which occurs when the

modem is dialing, online, or answering a call. The LED flashes when the modem is in the busy-out
or out-of-service state.

Power Supplies

DC voltages are supplied to all modems in the CC9600 rack through two PS9600 universal input switching
power supplies designed for conventional 115 or 230 VAC input. The power supplies are designed for
redundant, fail-safe operation. If one should fail, the other can supply the power requirements of the entire
CommPlete Communications Server. Each PS9600 power supply has one LED indicator that indicates the
presence of all supply voltages.

CommPlete Communications Server 3

MT5634HD8/16 User Guide

j

g

Technical Specifications

Model Numbers MT5634HD8 and MT5634HD16

Data Rates (Modem) Eight or sixteen independent modems (Modem A, B, C, D, E, F, G, H), each

operating as follows:

Downloads at speeds to 56K bps when calling a fully digital K56flex server
(actual connect speed depends on line conditions).

Uploads and other connections at 33,600, 31,200, 28,800, 26,400, 24,000,
21,600, 19,200, 16,800, 14,400, 12,000, 9600, 4800, 2400, 1200, or 0-300 bps

Data Rates (Fax) 14,400, 9600, 4800, and 2400 bps

Data Format
(Modem)

Configuration Each of the card’s modems is independently configurable

Compatibility (Modem) ITU-T V.42bis, V.42, V.34, ITU-T V.32bis, V.32, V.25bis, V.21, V.22bis, V.22,

Compatibility (Fax) ITU-T Group 3, T.4, T.30, V.21, V.27ter, V.29, V.17, and EIA TR29.2

Error Correction ITU-T V.42 (MNP® Classes 3 and 4, and LAP-M)

Data Compression ITU-T V.42bis (4:1 throughput) or MNP 5 (2:1 throughput)

Speed Conversion Serial port data rates ad

Flow Control XON/XOFF, CTS/RTS

Mode of Operation Half or full duplex over dial-up lines; automatic or manual dialin

Intelligent Features Fully AT command compatible; auto dial; redial; repeat dial*; pulse or tone

AT Commands 100% compatible with standard AT command set

Command Buffer 40 characters

Serial, binary, asynchronous at all data rates

V.23, V.17, Bell 212A* and 103/113*, K56flex

ustable to 300, 1200, 2400, 4800,9600, 19,200, 38,400,

57,600, and 115,200 bps

, automatic

or manual answer

dial; dial pauses; call status display; auto-parity and data rate selection;
keyboard-controlled modem options; nonvolatile memory; on-screen
displays of modem parameters, stored telephone numbers, and help menus.

Automatic Dialing Standard AT command asynchronous dialing

Modem Modulations FSK at 300 bps, PSK at 1200 bps, QAM at 2400, 4800, and 9600 bps (non-

Fax Modulations V.21 CH2 FSK at 300 bps

Carrier Frequencies
ITU-T V.34

Carrier Frequencies:
AT&T V.32terbo/

4 CommPlete Communications Server

trellis), QAM with trellis-coded modulation (TCM) at 9600, 12,000, 14,400,
16,800, 19,200, 21,600, 24,000, 26,400, 28,800, 31,200, 33,600, plus K56flex
speeds

V.27ter DPSK at 4800 and 2400 bps
V.29 QAM at 9600 and 7200 bps
V.17TCM at 14400, 12000, 9600, and 7200 bps

1600, 1646, 1680, 1800, 1829, 1867, 1920, 1959, 2000 Hz

1800 Hz

ITU-T V.32bis/V.32

1 Introduction

Carrier Frequencies:
V.22bis/V.22 or
Bell 212A Standard
(2400 & 1200 bps)

Carrier Frequencies:
Bell 103/113
(300 bps)

Carrier Frequencies:
V.21

Carrier Frequencies:
V.23

Transmit originate:
Transmit answer:
Receive originate:
Receive answer:

Transmit originate:

Receive originate:

Transmit answer:

Receive answer:

Transmit originate:

Receive originate:

Transmit answer:

Receive answer:

Transmit originate:

Receive originate:

Transmit answer:

Receive answer:

1200 Hz
2400 Hz
2400 Hz
1200 Hz

1270 Hz mark
1070 Hz space
2225 Hz mark
2025 Hz space
2225 Hz mark
2025 Hz space
1270 Hz mark
1070 Hz space

980 Hz mark

1180 Hz space
1650 Hz mark
1850 Hz space
1650 Hz mark
1850 Hz space
980 Hz mark
1180 Hz space

390 Hz mark

450 Hz space
1300 Hz mark
2100 Hz space
1300 Hz mark
2100 Hz space
390 Hz mark
450 Hz space

Fax Modulations V.21Ch2 FSK at 300 bps

V.27ter DPSK at 4800 and 2400 bps
V.29 QAM at 9600 and 7200 bps
V.17 TCM at 14400, 12000, 9600, and 7200 bps

Fax Carrier
Frequencies

V.21 CH2 (half duplex)
1650 Hz mark, 1850 Hz space for transmit originate
1650 Hz mark, 1850 Hz space for transmit answer
V.27ter: 1800 Hz Originate/Answer
V.29 QAM: 1700 Hz Originate/Answer
V.17 TCM: 1800 Hz Originate/Answer

Transmit Level -13 dBm

Frequency Stability +0.01%

Receiver Sensitivity -43 dBm under worst case conditions

AGC Dynamic Range 43 dB

Interface TIA / EIA RS-232/ITU-T V.24/V.28

Diagnostics Power-on self-test, local analog loop, local digital loop, remote digital loop.

CommPlete Communications Server 5

MT5634HD8/16 User Guide

Firmware Upgrades Flash memory; available on Multi-Tech’s BBS and website

Indicators LEDs for Carrier Detect and Off Hook/Out-Of-Service

Environmental Temperature range: 0°–50°

Power
Requirements:

C (32°–120° F)

Humidity range: 20–90% (noncondensing)

MT5634HD8

MT5634HD16

5 VDC at 1.5 A (MT5634HD8)

5 VDC at 3.0 A (MT5634HD16)

Dimensions 23.3 × 2.3 × 29.2 cm (9.2 × 0.9 × 11.5 in.) H × W × D

Weight:

MT5634HD8

MT5634HD16

14 oz.

1 lb.

Limited Warranty Two years

6 CommPlete Communications Server

2 Installation

CommPlete Communications Server 7

MT5634HD8/16 User Guide

Introduction

This chapter describes how to install the MT5634HD8/16 modem card into a CommPlete Communication
Server CC9600 chassis. This equipment should be installed only by a qualified service person.

The MT5634HD8/16 assembly consists of a high-density modem card and a front panel. Figure 1 shows the
layout of the MT5634HD16 card (the MT5634HD8 card is not shown). The MT5634HD8/16 assembly plugs
into power and data, Ethernet, and T1 bus connectors on the inside of the CC9600 chassis. There are no
external connectors.

48 pin

96 pin

24 pin

LEDs

Figure 1. MT5634HD16 modem card.

Safety Warnings

✔ Never install telephone wiring during a lightning storm.

✔ Never install telephone jacks in wet locations unless the jacks are specifically designed for wet

locations.

✔ Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected

at the network interface.

✔ Use caution when installing or modifying telephone lines.

✔ Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote

risk of electrical shock from lightning.

✔ Do not use the telephone to report a gas leak in the vicinity of that leak.

✔ Ports that are connected to other apparatus are defined as SELV. To ensure conformity to EN 41003,

ensure that these ports are only connected to the same type on the other apparatus.

8 CommPlete Communications Server

Pre-Installation Notes

Warning: Direct interconnection (or connection by way of other apparatus) of ports marked “SAFETY
WARNING see instructions for use” with any other ports (whether or not similarly marked) may

produce hazardous conditions on the network.

MultiTech strongly urges you to consult a qualified engineer before attempting to make this type of
connection.

• All installation must be done by a qualified service person.

• To reduce emissions, be sure to use blanking plates to cover empty slots in the CC9600 chassis.

• Cable, wiring, and any other apparatus connected between the MT5634HD8/16K modem and the point

of connection to any speech band circuit shall comply with the following:

1. The overall characteristics of the apparatus shall be such as to introduce no material effect upon

the electrical conditions presented to one another by the modem and the speech band circuit.

2. The apparatus shall comprise only

a. apparatus approved for the purpose of connection between the modem and a speech band

circuit; and

2 Installation

b. cable and wiring complying with a code of practice for the installation of equipment

covered by this part of BS 6328 or such other requirements as may be applicable.

Note: Such apparatus may have been approved subject to limitations in its use.

Installation Procedure

1. Unpack the MT5634HD8/16 assembly from its factory packaging. (You may wish to save the

packaging for possible future use.)

2. Perform a visual inspection of the MT5634HD8/16. If you are concerned about its condition, call

Technical Support for instructions.

3. The MT5634HD8/16 must be installed in a segment in which a RASCard is installed. Turn off the

RAS segment where the MT5634HD8/16 will be installed. (Turn off power to this segment.)

4. Remove a blank device front panel or previous MT5634HD8/16 card from the RAS segment used in

not

step 3. Do

5. Support the MT5634HD8/16 by the front panel and the bottom edge of the card, and carefully place

it into the CC9600’s open device slot. Make sure the edges of the MT5634HD8/16 card mate properly
with the guides of the device slot.

6. Slide the MT5634HD8/16 into the CC9600 chassis until you feel the MT5634HD16’s connectors mate

with the CC9600’s bus connectors.

remove the back panel.

CommPlete Communications Server 9

MT5634HD8/16 User Guide

7. Tighten the MT5634HD8/16’s retaining screws.

8. Repeat steps 1 through 7 for each of the MT5634HD8/16’s you are installing. Three MT5634HD8’s

must be installed for each T1 segment, three MT5634HD16’s must be installed for each Dual T1
segment, and one MT5634HD16 and one MT5634HD8 must be installed for each PRI segment.

9. Turn on power to the RASCard segment.

10. Check the LED indicators on the RASCard and the controllers. If the LEDs on the controller do not

light, turn off the RASCard segment. Reseat the cards by repeating steps 5 through 9. If you continue
to experience problems, consult your CommPlete

Note: A self-test runs each time the CommPlete Communications Server is turned on. Refer to your
system

Owner’s Manual

Owner’s Manual

for more details on the power-on self-test.

for troubleshooting tips.

10 CommPlete Communications Server

3 AT Commands

CommPlete Communications Server 11

MT5634HD8/16 User Guide

Working with AT Commands

The MT5634HD8/16’s modems are controlled by instructions called
attention characters
You can send commands to the modem from your keyboard while in terminal mode, or you can use
communications software to issue these commands automatically.

The modem is in command mode when it is not dialing or online. When it is in command mode, you have
access to a complete communications system that allows you to use several features, including the basic
AT command set described in this chapter. Using the basic AT command set, you can enter phone
numbers for automatic dialing, configure modem options, and monitor telephone activity. In addition,
you can command your modem to perform advanced features such as error correction, data compression,
speed conversion, and more.

This chapter describes the modem’s operational modes, and shows you how to use each of the modem’s
AT commands. These commands and responses are compatible with all systems and with all data
communications software using the AT command set.

Modes of Operation

The MT5634HD8/16 operates in two basic functional modes:
also an in-between state,
online.) When you power up the modem, it is in command mode, and is ready to accept and respond to
commands from your keyboard or software.

The modem enters online mode after it dials, connects with another modem, and detects a valid carrier
signal. If it does not detect a carrier signal within the time frame controlled by register S7, the modem
abandons the call and re-enters command mode.

AT commands

AT

precede each command or sequence of commands (known as a

wait-for-carrier

command mode

, in which the modem is out of command mode but not yet

and

, so called because the

command string

online mode

. (There is

).

You can make the modem enter online mode without dialing by typing either the D command or the A
command.

The modem exits online mode if the carrier signal is lost or intentionally dropped. When this happens, the
modem hangs up and re-enters command mode.

By sending certain “escape” characters to the modem while online, you can make it enter command mode
without losing the carrier signal.

Command Structure

You can control a wide variety of modem operations and options when the modem is in command mode.
AT commands tell the modem to dial a number, to answer a call, to operate at a certain speed, to use a
certain compression technique, and many other functions. AT commands consist of one or two letters,
which may be preceded by an ampersand (
command, for example, determines whether the modem returns result codes, while the &Q command
selects the asynchronous communications mode.

&

), a percent character (%), or a slash character (\). The Q

12 CommPlete Communications Server

A parameter after a command (0, 1, 2, etc.) tells the modem which option to use. If you do not specify a
parameter, the modem assumes the 0 (zero) option. E, for example, is the same as E0. You can issue
several commands on a single line (a command string) as long as the line does not exceed 40 characters.

Note: Each character in a command counts towards the 40 character command line maximum. While Q1
is a single command, it counts as two characters in the command line.

Each command has a valid range of parameters; for example, &S can have only 0 or 1 as a parameter. Valid
commands always generate an
parameters. An invalid command, such as &S3, which has a parameter outside the valid range, generates

ERROR

an
turned on or reset with the ATZ or AT&F command. Factory defaults are stored in read-only memory
(ROM), and cannot be changed. User-defined defaults can be stored in nonvolatile random-access
memory (NVRAM), and can be changed or deleted at will.

Command Editing

Always begin a command with the letters AT. Enter the entire command string in upper or lower case, but
do not cannot mix cases within the command string. The AT command is not executed until you press the

NTER key. Use the BACKSPACE key to erase the previous command character. It will not erase the AT

E
characters once they are typed. If your keyboard has no B
character recognized by the modem as B

3 AT Commands

OK result code, and a few generate an additional response, such as a list of

result code. Most commands have a default parameter that is enabled when the modem is

ACKSPACE key, use CTRL+H. (You can change the

ACKSPACE to any other ASCII character by changing register S5.)

Press C

TRL+X to cancel an entire command that has been typed but not yet executed. This also clears the

command buffer. The effect is the same as backspacing the command, only quicker.

The modem stores characters entered in a command in it’s command buffer until they are executed by
pressing E

NTER. The command buffer’s capacity is 40 characters. The attention characters (AT) do not

count towards the 40 character command line maximum. You may use spaces for increased readability
when typing a command. Spaces are not stored in the command buffer, and they do not count towards the
40 character command line maximum. Special characters, such as hyphens and parentheses, are not
allowed.

If you exceed the 40-character limit or type invalid characters, the command buffer is automatically erased

ERROR

and an

message displays. You should retype the command within the 40-character limit, using

only the allowed characters.

The commands in this chapter are organized by function. A brief summary follows.

CommPlete Communications Server 13

MT5634HD8/16 User Guide

Table 1. AT Commands by Function

Topic Command Description Page
Dialing Action D Dial 15

Dial Modifiers L Redial last number 16

Phone Number &Z Store a phone number 18
Memory DS Dial a stored number

Configuration &W Store configuration 18
Storage & Recall &F Load factory default configuration

H On-hook/off-hook

P Pulse dialing
T Tone dialing
V Speakerphone mode

W Wait for new dial tone

, Dialing pause
; Return to command mode after dialing
! Flash on-hook

$ Detect call card tone

@ Quiet answer

^ Disable data calling tone transmission

Z Reset modem

&Y Select stored configuration on power-up

Modem Responses E Echo command mode characters 19
(Result Codes) Q Result codes: enable/disable

V Result codes: verbose/terse

\V Protocol result code

X Result codes and call progress

&Q Select asynchronous communications

mode

%B View numbers in blacklist

Online Connection B Answer tone 22

C Carrier control
F Echo online data characters

&G Guard tones

-C Data calling tone
N Modulation handshake

\T Disable inactivity timer

Y Long space disconnect

RS-232 Interface &C Carrier Detect control 24
Controls &D Data Terminal Ready control

&S Data Set Ready control

Error Correction & \N0 or &Q6 Non-error correction mode 26
Data Compression \N3 Auto-reliable mode

\N2 Reliable mode
%C0 Data compression disabled
%C1 Data compression enabled

14 CommPlete Communications Server

3 AT Commands

Topic Command Description Page
Immediate Action A/ Repeat last command 27

I Information request
&B V.32 auto retrain
&V View current configuration

Flow Control &M0 Asynchronous mode 27

&K0 or \Q0 Flow control disabled
&K3 or \Q3 Hardware flow control
&K4 or \Q1 XON/XOFF flow control

\X0 XON/XOFF no pass-through

&J Auxiliary relay control

\J Enable data buffer control
\G Modem port flow control
\K Set break control

+ES=6 Enable synchronous buffered mode

Escape +++AT<CR> Default in-band escape sequence 29
Sequences A Force answer mode

O Go back online

Diagnostics &T Self-test commands 31

Speaker Settings L Monitor speaker volume 31

Dialing Commands

Dialing commands are used to dial and hang up.

Ds Dial

s

= phone number

Default: none

D

The letter
example, if you type

The MT5634HD8/16 supports several dialing methods. With the D command, you can specify either pulse
(ATDP) or tone (ATDT) dialing. You can also modify the dialing command with several other characters
that are explained in the section “Dial Modifier Commands”, later in this chapter.

The modem also lets you select either smart (wait-for-dial-tone) dialing or blind dialing. With smart
dialing, the modem waits for and detects dial tones and busy signals. With blind dialing, the modem works
with timed pauses (determined by the value of register S6), not dial tone and busy signal detection. See the
X command for more information on blind and smart dialing.

in a command causes the modem to dial the telephone number immediately following it. For

M Monitor speaker mode

ATD5551212<CR>, the modem dials the number 555-1212.

CommPlete Communications Server 15

MT5634HD8/16 User Guide

Hn On-Hook/Off-Hook

n

= 0 or 1

Default: 0

Use the H command to make the modem hang up (go on-hook) or simulate the action of picking up a
telephone handset (go off-hook).

H0 (or H) hangs up the modem

H1 brings the line off-hook, just as if you had picked up the telephone handset.

It is not necessary to use the H1 command to bring the line off-hook when using the D command. The
modem automatically goes off-hook when you press E

Dial Modifier Commands

The dial string can include the digits 0 through 9, the pound sign (#), the asterisk (*), and the letters A, B,

C

, or D. The latter are used by some PBXs; the exact function will depend on the PBX manufacturer’s
feature set and implementation. There are also several command characters, called “dial modifiers,” that
can be included within a dialing command after the letter
pauses in the dial sequence, automatic redials if a number is busy, and reverting to command mode or
switching to answer mode after dialing.

NTER at the end of the dial command.

D

. Their functions include pulse or tone dialing,

L Redial Last Number

Default: none

You can redial the last number dialed by entering L immediately following the dial command (ATD). This
command is handy if you encounter a busy signal and want to try the call again.

P, T Pulse or Tone Dialing

Default: T

The MT5634HD8/16’s modems can dial numbers by using pulse dialing, tone dialing, or a combination of
both methods. Pulse dialing, used by rotary-dial telephones, uses the timed opening and closing of a relay
to encode the numbers. Tone dialing, used by push-button (touch-tone) telephones, uses dual tone
multifrequency (DTMF) dialing.

P selects pulse dialing.

T selects tone dialing.

Insert P or T in the dialing command just before the digits you want to pulse- or tone-dial. If neither pulse
nor tone dialing is specified in the dial command, the modem uses whatever method was used last.

Note: When your modem is first turned on or reset, it uses the tone dialing method, (which is the default),
even if you do not include T in your dial command.

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Examples:

To pulse-dial the number 555-1212, type

3 AT Commands

ATDP5551212 and press ENTER.

To tone-dial the same number, type

To call out of a PBX (switchboard) system where a
to be tone-dialed after pausing for a second dial tone, type
comma causes a pause.)

ATDT5551212 and press ENTER.

V Switch to Speakerphone Mode

Inserting V into the dialing command causes the modem to switch to speakerphone mode and dial the
following number. Use ATH to hang up.

W Wait for New Dial Tone

Inserting W into the dialing command causes the modem to wait for another dial tone before it resumes
dialing. (It is not necessary to enter W at the beginning of the dialing command.)

Note: Because the modem must be able to detect the dial tone for this command to work, you also must
select wait-for-dial-tone dialing with the X2 or X4 command.

, Dialing Pause

Enter a comma in the dialing string to make the modem pause while dialing. This pause lasts two seconds
(North American models) or four seconds (U.K. and International models) for each comma entered. You
can force longer pauses by entering multiple commas, or you can change the length of the pause caused by
a comma by setting register S8 to any value from 0 through 255 seconds (North American), 4 through 7
seconds (U.K.) or 4 through 255 seconds (International).

9

has to be pulse-dialed, and the rest of the number has

ATDP9,T5551212 and press ENTER. (The

Note: Each comma in a dialing command counts as one of the 40 allowed characters.

; Return to Command Mode After Dialing

Enter a semicolon (;) as the last character of a dialing command to cause the modem to return to
command mode immediately after executing the command instead of waiting for a carrier signal and
going online.

For example, type
mode. The semicolon is useful when modem data transfer is not desired, as in voice communications, or
in applications using touch tones as a data entry method, such as bank-by-phone.

ATDT5551212; to tone-dial the number and immediately go back into command

! Flash On-Hook

Some switchboard systems react to a momentary on-hook condition. Insert an exclamation mark into the
dialing command to cause the modem to “flash” on-hook for half a second, just as if you had pressed the
switch hook on a telephone set for half a second. (With U.K. models, the exclamation mark causes the
modem to flash on-hook for 90 milliseconds.)

For example, to flash on-hook to transfer to extension 5678 after dialing the number 555-1234, type

ATDT5551234,,!5678. The commas cause a 4-second pause.

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$ Detect Call Card Tone

Use the $ command to dial services that require you to enter your call card number after a tone. The $
character in the dialing string causes the modem to pause and wait for an AT&T call card “bong” or a 1600
Hz tone. When the modem detects the tone, it processes the rest of the dialing string. If it does not detect
the tone within the time set in register S7, the modem stops processing the dial string with a

CARRIER

@ Quiet Answer

Use the @ command to access a system that does not provide a dial tone. The @ command causes the
modem to wait before processing the next character in the dialing string. The wait is for one or more rings
back followed by five seconds of silence.

NO

message. Pressing any key also terminates the $ command.

For example,
wait for the time specified in register S7
detects a busy signal, it hangs up and generates a
silence, it hangs up and generates a
dials the second number (631-3550).

ATDT5551212@6313550 causes the modem to dial the first number (555-1212), then

for at least one ringback and five seconds of silence. If the modem

BUSY

result code. If it does not detect five seconds of

NO ANSWER result code. If it does detect five seconds of silence, it

^ Disable Data Calling Tone Transmission

Use the ^ command to disable the transmission of data calling tones.

In the following example, the ^ command is used to tone dial 555-1212 and suppress data calling tone
transmission.

ATDT^5551212

Phone Number Memory Commands

The modem can store up to four telephone numbers in nonvolatile memory. You can store the numbers
with the &Z command and dial them with the ATDS command.

&Zn=s Store a Phone Number

s

= phone number n= 0, 1, 2 or 3

Default: none

You can store a telephone number string in the modem’s phone number memory. You can store four of
these strings using the &Zn=s command. The memory locations are labeled

N0

through N3.

For example, the telephone number 1-612-555-1212 is stored at memory location N2 by typing

&Z2=16125551212 and pressing ENTER.

DSn Dial a Stored Number

n

= 0, 1, 2, or 3
Default: none

You can automatically dial a telephone number that is stored in the modem’s number memory by typing

ATDSn, where

terminal mode and pressing E

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n

= 0 through 3. For example, you can dial a number stored at N2 by typing ATDS2 in

NTER.

Configuration Storage and Recall Commands

The MT5634HD8/16 stores parameters in two places. It stores factory default parameters in read-only
memory (ROM), and customized parameters in nonvolatile random access memory (NVRAM). You can­not change the default parameters in ROM, but you can change parameters in temporary memory and
then store them in NVRAM as custom settings. You can then recall the custom settings as if they were
factory default settings.

&Wn Store Configuration

n

= 0

Default: &W0

The &W command stores current AT commands and S-register values in nonvolatile memory, so you
won’t lose your custom settings when you turn off the modem or reset it.

&W0 (or &W) stores all current AT command and S-register values in nonvolatile random access memory
(NVRAM) and configures the modem so that it reads your custom settings in NVRAM when the modem is
turned on or when it is reset with the Z command. The &F reset command will continue to read the factory
default settings in ROM.

&Fn Load Default Configuration

n

= 0

Default: &F0

3 AT Commands

MT5634HD8/16 modems store factory default AT command settings and S-register values in read-only
memory (ROM); they store your custom AT command and S-register values in nonvolatile random access
memory (NVRAM).

The &F0 (or &F) command resets the modem to the factory default values stored in ROM.

Zn Reset Modem

n

= 0 or 1

Default: none

The Z command resets the modem to the configuration last saved by the &W command. The default
values come from the customized configuration in NVRAM.

Z1 is the same as Z0, and functions identically.

&Yn Select Stored Configuration for Hard Reset

n

= 0

Default: 0

This command is included for compatibility with applications that issue the &Y0 command. Modem
functions are not changed.

&Y0 selects the profile stored at location 0 on power-up.

Modem Response (Result Code) Commands

The MT5634HD8/16’s modems can give responses to commands. The most common one is OK, but the
modems can also alert you or your software to dial tones, busy signals, connection speeds, and whether the

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MT5634HD8/16 User Guide

connection is made with error correction or compression enabled. These responses are called
and they can be terse (numbers) or verbose (text).

En Echo Command Mode Characters

n

= 0 or 1
Default: E1

Normally, when you type commands on the keyboard, the modem echoes the characters back to the
computer or terminal, which displays them on the monitor. Use the E command to turn this feature off
and on.

E0 disables the echo.

E1 enables the echo.

Qn Result Codes Enable/Disable

n

= 0 or 1
Default: Q0

You can use the Q command to enable or disable result codes for applications such as computer-controlled
auto dialing.

Q0 (or Q) enables result codes.

Q1 disables result codes for applications such as computer-controlled auto-dialing.

result codes

,

Vn Result Codes (Verbose/Terse)

n

= 0 or 1
Default: V1

The V command controls whether the modem’s result codes display as text (“verbose”) or numeric
(“terse”) messages. For example, if no carrier signal is detected after dialing, the result can be displayed
either as

V0 (or V) displays the modem’s result codes as a number.

V1 displays result codes as text.

NO CARRIER, or as the number 3.

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