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Multitech MT5600BA User Manual

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Page 1
Model MT5600BA Model MT5600BL
Data/Fax Modem
User Guide
Page 2
MultiModemII User Guide
Models MT5600BA and MT5600BL P/N S0000129 Revision C
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 representations 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 in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.
Record of Revisions
Revision Date Description
C 6/1/01 Manual revised to add the MT5600BA/BL System CD, patent numbers, new
commands, and menu options; delete BBS references and digital loopback tests; and update phone numbers, regulatory agency statements, firmware upgrade instructions, Web links, and modem package components list.
Trademarks
MultiModemII, Multi-Tech, and the Multi-Tech logo are trademarks of Multi-Tech Systems, Inc.
Adobe and Acrobat are trademarks of Adobe Systems Incorporated. MNP and Microcom Network Protocol are trademarks of Microcom, Inc. K56flex is a registered trademark of Rockwell International Corporation and Lucent Technologies Corporation. Microsoft, Windows, Windows 95, Windows NT, and windows 2000 are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. All other brand and product names mentioned in this publication are trademarks or registered trademarks of their respective companies.
Patents
This device is covered by one or more of the following patents: 6,031,867; 6,012,113; 6,009,082; 5,905,794; 5,864,560; 5,815,567; 5,815,503; 5,812,534; 5,809,068; 5,790,532; 5,764,628; 5,764,627; 5,754,589; D394,250; 5,724,356; 5,673,268; 5,673,257; 5,644,594; 5,628,030; 5,619,508; 5,617,423; 5,600,649; 5,592,586; 5,577,041; 5,574,725; D374,222; 5,559,793; 5,546,448; 5,546,395; 5,535,204; 5,500,859; 5,471,470; 5,463,616; 5,453,986; 5,452,289; 5,450,425; D361,764; D355,658; D355,653; D353,598; D353,144; 5,355,365; 5,309,562; 5,301,274. Other patents pending.
Notice
Though these modems are capable of 56K bps download performance, line impairments, public tele­phone infrastructure and other external technological factors currently prevent maximum 56K bps connections.
Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112 U.S.A
Telephone (763) 785-3500 or (800) 328-9717 Fax (763) 785-9874 Technical Support (800) 972-2439 Internet http://www.multitech.com
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FCC Part 15
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 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 receiver.
• Plug the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC rules. Operation of this device is subject to the following conditions: (1) This device may not cause harmful interference, and (2) this device must accept any inter­ference that may cause undesired operation.
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.
Industry Canada
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Reglement Canadien sur le matériel brouilleur.
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MultiModemII User Guide
Chapter 1: Introduction
Introduction ............................................................................................................................. 2
Product Description................................................................................................................ 2
Features .................................................................................................................................... 2
What Is in Your Modem Package? ....................................................................................... 4
Related Manuals ..................................................................................................................... 4
Chapter 2: Installation
Introduction ............................................................................................................................. 6
What You Will Need ..............................................................................................................6
Safety Warnings ...................................................................................................................... 6
Step 1: Connect the Modem to Your System ...................................................................... 7
RS232 Connection ............................................................................................................ 7
Dialup Connection .......................................................................................................... 7
Two-Wire Leased Line Connection............................................................................... 8
Four-Wire Leased Line Connection .............................................................................. 8
Phone Connection............................................................................................................ 8
Power Connection ........................................................................................................... 8
Surge Protectors and Lightning ..................................................................................... 8
Power-On Test ................................................................................................................. 8
Step 2: Install the Modem Driver ......................................................................................... 9
Installing the ModemDriver .......................................................................................... 9
Removing an Old Modem Driver ................................................................................. 9
Step 3: Install and Configure Your Software .................................................................... 10
Contents
Chapter 3: Using the Front Panel
Introduction ........................................................................................................................... 12
Modem Configuration ......................................................................................................... 12
LED Indicators ...................................................................................................................... 12
Liquid Crystal Display (LCD) ............................................................................................. 13
Option Selection ............................................................................................................. 13
Menu Structure .............................................................................................................. 13
Menu Overview ............................................................................................................. 14
Status Trunk ............................................................................................................ 15
Basic Options Trunk ............................................................................................... 16
Advanced Options Trunk ...................................................................................... 18
Remote Configuration Options Trunk................................................................. 20
Diagnostic Options Trunk ..................................................................................... 20
Phone Number Memory Options Trunk ............................................................. 21
Caller ID Options Trunk ........................................................................................ 21
Menu Options ................................................................................................................ 22
Status ........................................................................................................................ 22
Basic Options .......................................................................................................... 23
Advanced Options ................................................................................................. 25
Remote Configuration Options ............................................................................ 27
Diagnostic Options ................................................................................................. 27
Phone Number Memory Options ........................................................................ 27
Caller ID Options ................................................................................................... 28
Chapter 4: AT Commands, S-Registers & Result Codes
Introduction ........................................................................................................................... 30
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MultiModemII User Guide
AT Commands ...................................................................................................................... 31
S-Registers.............................................................................................................................. 48
Result Codes .......................................................................................................................... 53
Chapter 5: Remote Configuration
Introduction ........................................................................................................................... 57
Basic Procedure ..................................................................................................................... 57
Setup ....................................................................................................................................... 57
Changing the Remote Configuration Password ....................................................... 57
Changing the Remote Escape Character .................................................................... 58
Chapter 6: Callback Security
Introduction ........................................................................................................................... 60
Setup Procedures .................................................................................................................. 60
Turning Callback Security On and Off ....................................................................... 60
Assigning Callback Passwords .................................................................................... 61
Assigning Callback Phone Numbers .......................................................................... 62
Calling Procedure ................................................................................................................. 63
Callback Security Commands ............................................................................................. 64
Callback Assignments Form ............................................................................................... 65
Contents
Chapter 7: Leased Line Operation
Introduction ........................................................................................................................... 67
Two-Wire Setup .................................................................................................................... 67
Four-Wire Setup .................................................................................................................... 68
Dial Backup and Leased Line Restoral .............................................................................. 69
Dial Backup and Leased Line Restoral Setup ................................................................... 69
Leased-Line Operating Distances....................................................................................... 70
Chapter 8: Solving Problems
Introduction ........................................................................................................................... 72
None of the Indicators Light ............................................................................................... 72
The Modem Does Not Respond to Commands ............................................................... 73
The Modem Cannot Connect When Dialing .................................................................... 74
The Modem Disconnects While Online ............................................................................. 75
The Modem Cannot Connect When Answering .............................................................. 76
File Transfer Is Slower Than It Should Be ......................................................................... 76
Data Is Being Lost ................................................................................................................. 77
There Are Garbage Characters on the Monitor ................................................................ 77
The Modem Doesn’t Work with Caller ID ........................................................................ 77
Fax and Data Software Can’t Run at the Same Time ...................................................... 78
Appendix A: Regulatory Compliance
FCC Part 68 Telecom ............................................................................................................ 80
Fax Branding Statement ....................................................................................................... 81
Canadian Limitations Notice .............................................................................................. 82
EMC, Safety, and R&TTE Directive Compliance ............................................................. 82
International Modem Restrictions ...................................................................................... 83
New Zealand Telecom Warning Notice ............................................................................ 83
South African Notice ............................................................................................................84
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Contents
Appendix B: Technical Specifications
.................................................................................. 85
Appendix C: Loopback Tests
Introduction ........................................................................................................................... 87
Local Analog Loopback Test (V.54 Loop 3) ...................................................................... 87
Remote Digital Loopback Test (V.54 Loop 2) ................................................................... 88
Local Digital Loopback Test (V.54 Loop 2) ....................................................................... 89
Back-to-Back Test .................................................................................................................. 90
Appendix D: Warranty, Service, and Technical Support
Limited Warranty ................................................................................................................. 92
Online Warranty Registration ............................................................................................. 92
Service .................................................................................................................................... 92
North American Products ............................................................................................ 92
International Products .................................................................................................. 93
Ordering Accessories ........................................................................................................... 93
Technical Support ................................................................................................................. 94
Internet Sites .......................................................................................................................... 94
Appendix E: Upgrading the Modem
Introduction ........................................................................................................................... 95
Upgrade Overview ............................................................................................................... 95
Step 1: Identify the Modem Firmware ............................................................................... 95
Step 2: Identify the Current Firmware Version ................................................................ 96
Step 3: Download the Upgrade File ................................................................................... 96
Step 4: Extract the Upgrade Files........................................................................................ 96
Step 5: Clear Your Stored Paramenters ............................................................................. 96
Step 6: Upgrade the Modem’s Firmware .......................................................................... 97
Step 7: Restore Your Parameters ........................................................................................ 97
Appendix F: Installing a Modem Under Linux
Introduction ........................................................................................................................... 98
Standard Linux Serial Port Definitions.............................................................................. 98
Installation ............................................................................................................................. 98
Setup ....................................................................................................................................... 98
Using the Terminal Program Minicom to Verify Operation ................................... 98
Using the Modem to Call the Internet ........................................................................ 99
Calling the ISP ................................................................................................................ 99
Answering Calls ............................................................................................................ 99
Appendix G: Pin Descriptions
RS-232 Pin Descriptions ..................................................................................................... 100
RS-232 Cable Pinouts ......................................................................................................... 101
Leased Line Pinouts ........................................................................................................... 102
Appendix H: ASCII Character Map
Index
..................................................................................................................................................................... 104
.......................................................................................... 103
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1
Introduction
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MultiModemII User Guide

Introduction

Congratulations on your purchase of the MultiModemII modem. You have acquired one of the finest intelligent data/fax modems available today from one of the world’s oldest modem manufacturers: Multitech Systems, Inc. This user guide will help you install, configure, test and use your modem.

Product Description

1 Introduction
The MultiModemII MT5600BA and MT5600BL modems incorporate the K56flex and V.90 protocols, both of which enable Internet connections at data rates up to 53K bps* over standard telephone lines. These protocols are able to send data down­stream to your computer at high speeds by taking advantage of the fact that data on the telephone network normally is converted from digital to analog only once before it reaches your modem. Upstream transmissions and transmissions between client mo­dems are limited to data rates of 33.6K bps, as are downstream transmissions that are converted more than once on the telephone network.
Both models support two-wire leased line operation. The MT5600BL model also supports four-wire leased line operation with dial backup and automatic leased line restoral. Please note that, because leased line operation consists of two client mo­dems connected to each other, the maximum leased line data rate is 33.6K bps.
The MultiModemII offers interactive automatic dialing. You can store four command lines or telephone numbers of up to 30 characters each in the modem’s nonvolatile memory. The modem pulse- or tone-dials, and recognizes dial tones and busy sig­nals for reliable call-progress detection. It can also detect AT&T calling card tones. It is FCC-registered for connection to telephone networks without notification to the telephone company.
The MultiModemII front panel includes a liquid crystal display and four buttons, which together can be used to either display the current connection status of the mo­dem or to configure the modem. The MultiModemII also can be configured through standard AT commands.
™

Features

General
• Complies with major ITU-T, TIA, and EIA international standards to ensure com­patibility with other modems.
• Uses DTMF and tone detection to distinguish data and fax calls when used with software that supports these features.
• Supports serial port speeds to 230.4K bps with compatible serial ports
• Supports Caller ID (North American versions only).
• Displays status and configuration information on a front panel LCD.
*Though this modem is capable of 56K bps download performance, line impairments, public
telephone infrastructure, and other external technological factors currently prevent maxi­mum 56K bps connections.
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Data
• Supports K56flexTM and ITU-T V.90 speeds plus 33.6K, 31.2K, 28.8K, 26.4K, 24K,
21.6K, 19.2K, 16.8K, 14.4K, 12K, 9.6K, 7.2K, 4.8K, 2.4K, 1.2K, and 0–300 bps.
Note: Under the 56K bps standards, you can asymmetrically download data from an ISP at speeds up to 53K bps, but upload only at speeds up to 33.6K bps. Client­to-client operation, including leased line operation, is also limited to 33.6K bps.
• Supports automatic fallback to slower speeds in noisy line conditions, and fall­forward to faster speeds as conditions improve.
• Supports ITU-T V.42 LAP-M and MNP Class 3 and 4 error correction.
• Supports ITU-T V.42bis (4-to-1) and MNP 5 (2-to-1) data compression.
• Supports both synchronous and asynchronous data transfer.
• Both models support two-wire leased line operation. The BL model also supports
four-wire leased line operation with dial backup and leased line restoral.
• Supports callback security and remote configuration.
• Supports AS400 applications.
1 Introduction
• Automatically disables compression when transferring already-compressed files.
• Can autodial, redial, pulse (rotary) and touch-tone dial.
• Detects dial tones and busy signals for reliable call-progress detection.
• Compatible with the standard AT command set used by most communication
programs.
• Supports the H.324 protocol (videophone ready).
• Supports Plug and Play (PnP).
• Can be flash upgraded.
Fax
• Supports V.17, Class 1, Class 2, and Group 3 fax standards, allowing it to commu-
nicate with other fax modems as well as with fax machines.
• Sends and receives faxes from your computer at 14,400 bps, 12,000 bps, 9600 bps, 7200 bps, 4800 bps, 2400 bps, or 300 bps.
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MultiModemII User Guide

What Is in Your Modem Package?

Your modem package has several components. Make sure you have them all before trying to operate your modem. Your package should include:
• An MT5600BA or MT5600BL modem
A power transformer
•
Country-specific telephone cordage
•
A 9-pin to 25-pin serial cable (international modem kits only)
•
A printed Quick Start Guide
•
A CD containing data communications and other programs
•
A CD containing modem drivers and this User Guide
•
If any of these items are missing, please contact Multi-Tech Systems or your dealer/dis­tributor (see Appendix D for information on contacting Multi-Tech via telephone, fax, or the Internet).

Related Manuals

1 Introduction
The following manuals are available from the Multi-Tech World Wide Web and FTP sites.
82076200 MT56XX Fax Class 1 Developer’s Guide
ftp://ftp.multitech.com/manuals/pdf/developers%20kits/5600fax.pdf
82006502 Fax Class 2 Developer’s Kit
ftp://ftp.multitech.com/manuals/pdf/developers%20kits/82006502.pdf
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Installation
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MultiModemII User Guide

Introduction

This chapter shows you step-by-step how to set up your Multi-Tech MultiModemII, check it out, and make your first calls.

What You Will Need

Before starting, please make sure you have everything you need:
We supply
4
An MT5600BA or MT5600BL modem
4
A power transformer
4
Country-specific telephone cordage
4
A 9-pin to 25-pin serial cable (international modem kits only)
4
A printed Quick Start Guide
4
An installation CD containing modem drivers and this User Guide
4
A CD containing data communications and other programs
2 Installation
You supply
4
A computer with an unused serial port
4
A shielded RS-232 serial cable with a male DB-25 connector on one end and a connector to match your computer’s serial port on the other end (North America only)
4
A nearby AC power outlet
4
A nearby telephone line jack
4
A nearby leased line jack or terminals (optional)

Safety Warnings

• Use this product only with UL- and CUL-listed computers.
• To reduce the risk of fire, use only 26 AWG or larger telephone wiring.
• Never install telephone wiring during a lightning storm.
• Never install a telephone jack in a wet location unless the jack is specifically de-
signed 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 is a risk of electrical shock from lightning.
• Do not use a telephone in the vicinity of a gas leak.
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MultiModemII User Guide

Step 1: Connect the Modem to Your System

Turn off your computer. Placing the modem in a convenient location, connect it to your computer’s serial port, to the telephone line, to your leased line, to AC power, and, optionally, to your telephone.
LEASEDLINE
PHONE
VOLUME
EIA RS232C
POWER
2 Installation
Figure 2-1. MT5600BL connections.

RS232 Connection

Plug one end of the serial cable into the RS232 connector on the modem, and the oth­er end into a serial port connector on your computer, such as COM1 or COM2.

Dialup Connection

Plug one end of the modular phone cable into the modem’s LINE jack, and the other end into a public switched telephone network (PSTN) wall jack.
Note: The LINE jack is not interchangeable with the PHONE jack. Do not plug the phone into the LINE jack or the line cable into the PHONE jack.
Note: Regulatory agencies may impose certain restrictions on equipment connected to public telephone systems. For more information, see Appendix A.
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MultiModemII User Guide

Two-Wire Leased Line Connection

MT5600BA: Plug one end of a two-wire phone cable into the modem’s LINE jack, and connect the other end to a leased line wall jack or terminals.
MT5600BL: Plug one end of a two-wire phone cable into the modem’s LEASED jack, and connect the other end to a leased line wall jack or terminals.

Four-Wire Leased Line Connection

On an MT5600BL only, plug one end of a four-wire phone cable into the modem’s LEASED jack, and connect the other end to a four-wire leased line wall jack or termi­nals. For dial backup operation, plug one end of the modular phone cable into the modem’s LINE jack, and the other end into a PSTN wall jack.

Phone Connection

For voice-only calls, plug a telephone into the modem’s PHONE jack (optional).
2 Installation

Power Connection

Plug the power transformer into an AC power outlet or power strip. Plug the power transformer’s cable into the POWER jack on the modem.
Note: Use only the power transformer supplied with the modem. Use of any other transformer voids the warranty and can damage the modem.

Surge Protectors and Lightning

Power surges and other transient voltages on power lines, such as those caused by lightning strikes, can damage or destroy your modem. Therefore, we recommend that you plug the modem into a surge protector rather than directly into a wall out­let, preferably a surge protector that provides protection against electrical spikes on the phone line as well as on the power line. Note that not even a surge protector can guard against damage from a nearby lightning strike. During an electrical storm, it is safest to unplug your computer equipment from both the power outlet and the telephone line.

Power-On Test

Test the modem by turning it on (a power switch is located on the front panel). When you apply power, the modem performs a diagnostic self-test, indicated by the TM indicator lighting for a few seconds, after which the LCD should light. If this does not happen, check that the power switch is on, the power transformer is sol­idly connected, and the AC outlet is live. If these measures do not work, see Chapter 8, “Solving Problems.”
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MultiModemII User Guide

Step 2: Install the Modem Driver

If you use Windows 95, Windows 98, Windows Me, Windows NT 4.0, or Windows 2000, you must install the modem driver. (If you use Windows 3.1 or another operat­ing system, skip this step and go to Step 3.)

Installing the ModemDriver

1. Make sure your modem is connected properly, and then turn on your computer. Windows should detect your new modem and open the Install New Modem wizard.
Note: If Windows cannot find a modem, your modem may be turned off, it may be plugged into the wrong connector on your computer, or the serial cable may be faulty. See “None of the LEDs Light When the Modem Is Turned On” and “The Modem Does Not Respond to Commands” in Chapter 5, “Solving Problems.”
2. In the Install New Modem wizard, select Don’t detect my modem; I will select it from a list, and then click Next. A dialog box with a list of manufacturers and a list of modem models appears.
2 Installation
3. Insert the installation CD into your CD-ROM drive, and then click Have Disk.
4. In the Install from Disk dialog box, select the drive the CD is in, and then click OK.
5. A list of modems appears. Select your modem from the list, and then click Next.
6. Select the port the modem is connected to, and then click Next.
7. Windows installs and configures the modem.
8. Click Finish to exit.

Removing an Old Modem Driver

When your new modem replaces another modem, the old modem driver remains in Windows, and the old modem driver is still selected in HyperTerminal and other Windows applications. Though you can change the application connection descrip­tions one at a time, it is easier to force Windows applications to use the new modem by removing the old modem driver from Windows.
1. Click the Start button, point to Settings, and click Control Panel.
2. Double-click the Modems icon to open the Modems Properties dialog box.
3. In the list box, select the old modem.
4. Click Remove, and then click Close.
5. The next time you dial a HyperTerminal connection, it will select your new modem and ask you to confirm the selection.
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MultiModemII User Guide

Step 3: Install and Configure Your Software

You may use either the communication program included with your modem or a third-party program. Communication programs designed for Windows 95/98/Me and Windows NT/2000 normally do not need to be manually configured, since they use the Plug and Play configuration supplied by the Windows modem driver. Com­munication programs designed for DOS and other operating systems, however, may need to be manually configured to work with your modem. Though each communi­cation program is different, the following procedure should work with most of them.
1. Turn on your computer and run your communication program.
2. Find the dialog box or menu that lets you select your modem. (In Windows Ter­minal select Settings | Modem Commands; in HyperTerminal select File |
Properties | Phone Number; and in PhoneTools select Configure | General Configuration | Communication | Change Modem.
3. Choose your modem from the program’s modem list. If it isn’t listed, choose a generic modem and modify the settings as necessary.
4. Change the modem initialization string, if necessary. The factory default config­uration works well for most purposes. To load the factory default configuration, use AT&F. To load a custom configuration that was saved using the &W com­mand, use ATZ. Note that the Z command must be in a command string by it­self. For a Macintosh, the initialization string should include the &D0 command. If you do not want the modem to always answer the phone, add S0=0 to the string. To use Caller ID with the modem, add S0=2 to the string (Caller ID information is sent between the first and second rings, so the phone must ring at least twice befor the modem picks up the line). Depending on the software, you might have to end the string with a carriage return character (^M).
2 Installation
Note: To change the modem’s default configuration, type new commands in the communication program’s terminal window, adding the &W command to store them in the modem’s nonvolatile memory. For instance, to create a default configuration for a Macintosh computer that turns off autoanswer, type AT&F&D0S0=0&W. The new configuration loads automatically whenever the modem is turned on or receives the ATZ command.
5. Select the port the modem is connected to (normally COM1 or COM2).
6. Select your serial port speed. This can be labeled “maximum speed,” “DTE bps,” or “baud rate.” Ideally, if you use data compression, you should set your serial port baud rate to four times the modem’s maximum transmission speed or faster; however, few files can be compressed enough to require speeds that high, and not all serial ports can handle speeds that high.
7. If the communication program has an autobaud selection, make sure it is disabled. Autobaud applies only to older modems, and can cause problems if enabled.
8. If the program allows you to edit the no-connect messages (NO CARRIER,
BUSY, NO ANSWER, NO DIALTONE), make sure there is no space between DIAL and TONE in NO DIALTONE.
9. Refer to the program manual or online help for other configuration choices. In most cases you can accept the default values.
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3
Using the
Front Panel
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MultiModemII User Guide

Introduction

Like any modem, your Multi-Tech modem operates only under the control of a communication program, such as the Phone Tools program included with the modem. It also operates under other general-purpose data communication pro­grams, such as Windows Terminal and HyperTerminal. For information on how to use the modem with the communication program of your choice, please refer to the program’s documentation.

Modem Configuration

Your modem normally is configured through Windows or through the communica­tion program you are using. The default settings work best for most purposes. See “Step 3: Install and Configure Your Software” in Chapter 2 for help in setting up your communication program.
You also can configure your modem either through the front panel or by sending AT commands to the modem. This chapter describes how to configure it using the front panel. To configure it using AT commands, see Chapter 4.
3 Using the Front Panel
Figure 3-1. Front panel

LED Indicators

The MT5600BA/BL has six LED indicators on the front panel that indicate status and activity:
Receive Data. The RD indicator flashes when the modem is receiving data.
Transmit Data. The TD indicator flashes when the modem is transmitting
data.
Carrier Detect. The CD indicator lights when the modem detects a valid carrier signal from another modem. It is on when the modem is communicating with the other modem, and off when the link is broken.
Off-Hook. The OH indicator 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 pulse-dials.
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MultiModemII User Guide
Terminal Ready. The TR indicator lights when a communication program is using the modem. It means the modem is ready for an outgoing or incoming call. It goes off when the communication program disconnects the serial port. When it goes off, a connected modem will disconnect.
Test Mode. The TM indicator lights when the modem is in test mode.

Liquid Crystal Display (LCD)

The MultiModemII’s backlit liquid crystal display (LCD) has two functions: to dis­play the current status of the modem and to display configuration menus, which are selected using the four pushbuttons on the front panel.

Option Selection

To select most configuration options, simply display the option in the LCD, and then press the Enter button to select it. An OPTION SET message appears to confirm the selection. To exit the OPTION SET message, press any button.
3 Using the Front Panel
Some options, such as password options and phone number options, require you to enter a character string. To select a character, press the áß and â buttons. To go to the next character position, press the à button. To backspace, press the à button before selecting a character. To exit without saving, press the à button several times. To save a character string, press the Enter button.

Menu Structure

The LCD menus have a tree structure with multiple trunks, limbs, branches, and twigs. For a schematic view, refer to the menu map on the next page.
Trunks are the major divisions of the menu tree. There are seven trunks: Status, Ba­sic Options, Advanced Options, Remote Configuration, Diagnostics, Phone Number Memory, and Caller ID. Use the áß and â buttons to move between trunks.
Limbs are subdivisions of trunks. Use the à button to move from a trunk onto its first limb, and the áß and â buttons to move between limbs on the trunk.
Branches are subdivisions of limbs. Use the à button to move from a limb onto its first branch, and the áß and â buttons to move between branches on the limb.
Twigs are status screens and options that are accessible only from branches. Use the à button to move from a branch to its first status screen or option; then press the áß and à buttons to move between options, and press the Enter button to select an op­tion.
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MultiModemII User Guide
Menu Overview
Trunks Limbs Branches Twigs
3 Using the Front Panel
Manual selection
Automatic selection
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MultiModemII User Guide
Status Trunk
The Status Trunk shows the current operating status of the modem. Limb changes are automatic, but certain options can be accessed by pressing the à button. Note that when the modem is online, pressing the à button shows the connect status, in­cluding the data speed, connection type, and compression type.
3 Using the Front Panel
Limbs Twigs
Manual selection
Automatic selection
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MultiModemII User Guide
Basic Options Trunk
Use the Basic Options Trunk to configure the modem’s basic operating conditions. When entering a number, use the áß and â buttons to scroll through a list of digits and characters. To go to the next position, press the à button. To back up or to exit without dialing, press the à button several times.
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Basic Options Trunk, continued
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Advanced Options Trunk
Use the Advanced Options Trunk to configure RS-232, dial backup, and callback se­curity options. When entering a number or password, use the áß and â buttons to select a character or digit. To go to the next position, press the à button. To back­space or to exit, press the à button several times.
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Remote Configuration Options Trunk
Use the Remote Configuration Options Trunk to enable or disable remote configura­tion on the modem, and to change the password. When entering the password, use the áß and â buttons to scroll through the alphabet. To go to the next character position, press the à button. To backspace or to exit, press the à button several times.
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3 Using the Front Panel
Diagnostic Options Trunk
Use the Diagnostic Options Trunk to run loopback tests on the modem. When a test is in progress, the TM indicator lights.
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Phone Number Memory Options Trunk
The MultiModemII can store up to four telephone numbers for speed dialing. Use the Phone Number Memory Options Trunk to store, list, and dial these numbers. When entering a number, use the áß and â buttons to scroll through the available digits and dialing commands. To go to the next position, press the à button. To backspace or to exit, press the à button several times.
Limb Branches Twigs
3 Using the Front Panel
Caller ID Options Trunk
Use the Caller ID Options Trunk to enable or disable Caller ID operation.
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Menu Options

This section describes important LCD screens and options. Many, but by no means all, of the options have AT command equivalents.
Status
Status screens display the current status of the modem. Though limb changes are automatic, certain options can be selected by pressing the à button.
STATUS = IDLE. The modem is ready but inactive. This screen appears when the modem is first turned on, and is the starting point for accessing all other screens. Three options are available from this screen by pressing the à button:
3 Using the Front Panel
MANUAL ORIG.? Places the modem in originate mode for the time specified by register S7. Use this option to connect to a remote modem by manually dialing the number on a phone connected to the local modem. When the remote modem answers, press the Enter button to establish a connection with the remote modem. You can also use this option to temporarily place the modem in originate mode for back-to-back testing.
MANUAL ANSWER? Places the modem in answer mode for the time specified by register S7. You can use this option to tempo­rarily place the modem in answer mode for back-to-back testing.
BUSY OUT MODEM? Takes the modem out of service by put­ting it into an off-hook state so that a calling modem receives a busy signal.
MODEM BUSIED OUT. Shows that the modem is busied out. To return the modem to normal service, press à, Enter.
STATUS = ONLINE. The modem is connected to another modem. Two options are available from this screen by pressing the à button:
Connect Status. Shows the connect speed, connection type, and error correction being used.
DISCONNECT? Press the Enter button to force the modem to hang up. Same as the ATH command.
RINGING. A remote modem or caller is attempting to establish a connection. One option is available from this screen by pressing the à button:
MANUAL ANSWER? Forces the modem to answer the phone. You can use this option to establish a connection if autoanswer is turned off (S0=0). Same as the ATA command.
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Basic Options
The following screens are used to configure the modem’s basic operating conditions.
ONLINE OPTIONS. The following screens are used to configure the online opera­tion of the modem:
DIALING OPTIONS. The following screens are used to configure dialing options or to dial manually.
3 Using the Front Panel
LINE TYPE OPTIONS. Use the à and Enter buttons to select from the following line types: dial-up (PSTN), two-wire leased line originate or answer, and four-wire leased line originate or answer.
ERROR CORRECTION OPTIONS. Use the à and Enter but­tons to turn error correction on or off, or to select automatic er­ror correction. Same as the &E0, &E1, and &E2 commands.
FLOW CONTROL OPTIONS. Use the à and Enter buttons to select no flow control, hardware flow control, or software flow control. Same as the &E3, &E4, and &E5 commands.
TONE/PULSE. Use the à and Enter buttons to select between DTMF tone dialing and pulse dialing. Same as the T and P com- mands.
BLIND/SMART DIAL OPTIONS. Use the à and Enter buttons to select blind dialing, in which the modem sends the OK, CON- NECT, RING, NO CARRIER, ERROR and NO ANSWER messag­es to the computer and does not look for a dial tone or busy signal, or smart dialing, in which the modem sends all messages to the computer, including NO DIALTONE and BUSY. Same as the X0 and X4 commands.
DIAL NUMBER. Use the front panel buttons to enter a phone number and dial it. To scroll through a list of digits and charac­ters, press the áß and â buttons. To go to the next position, press the à button. To back up or to exit without dialing, press the à button several times. To dial the number, press the Enter button. Same as the D command.
DTR DIALING. Use the à and Enter buttons to enable or dis­able DTR dialing. DTR dialing is popular in synchronous appli­cations. In DTR dialing, the modem automatically dials the number stored in memory location 0 when it detects a high DTR (Data Terminal Ready) signal on the RS-232 interface. The DTR signal must remain high for the duration of the call. To store the DTR dialing number, use the &Z0= command or the ENTER
PHONE #0 menu option.
Note: Plug and Play does not function if DTR dialing is enabled.
DTR is used during Plug and Play, and DTR dialing interferes with it.
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COMMAND MODE OPTIONS. The following screens are used to configure result code responses.
SYNC/ASYNC OPTIONS. Use the à and Enter buttons to select the method of data transmission.
3 Using the Front Panel
ENABLE/DISABLE RESPONSE. Use the à and Enter buttons to enable or disable the sending of result codes to the computer. Same as the Q0 and Q1 commands.
VERBOSE/TERSE RESPONSE. Use the à and Enter buttons to select verbose or terse result codes. Same as the V0 and V1 commands.
ENABLE/DISABLE CMD MODE. Use the à and Enter buttons to enable or disable the modem’s ability to accept AT com­mands .
ASYNC, NORM? Normal asynchronous transmission using the AT command set.
ASYNC, V.25bis? Asynchronous transmission using the V.25bis command set.
SYNC, NORM? Normal synchronous transmission using any command set.
V.25bis HDLC NRZ? V.25bis synchronous transmission using NRZ encoding. Not implemented.
V.25bis HDLC NRZI? V.25bis synchronous transmission using NRZI encoding. Not implemented.
V.25bis BISYNC? V.25bis bisynchronous transmission. Not implemented.
RESET FACTORY DEFAULTS. Use the à and Enter buttons to reset Profile 0 and the modem’s active configuration to the factory defaults. Same as the AT&F&W command string.
CONNECT RATE OPTIONS. Use the à and Enter buttons to change the modem’s serial port and data transmission speeds.
SERIAL BAUD RATE. Use the à and Enter buttons to select the modem’s serial port speed. The valid range is 1200 to 115200 bps. Same as the $SB commands.
MODEM SPEED. Use the à and Enter buttons to select the modulation protocol to use in originating or answering a connection. This also selects the maximum transmission speed at which the modem can operate. Same as the +MS=[mod] command.
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Advanced Options
RS232 OPTIONS. The following screens are used to configure the RS-232 interface.
3 Using the Front Panel
DTR OPTIONS. Use the à and Enter buttons to select how the modem responds to the high to low transition of the DTR signal sent by the computer. DTR NORMAL causes the modem to hang up; IGNORE DTR allows operation with computers that do not provide DTR; and RESET ON DTR â causes the modem to perform a soft reset as if the Z command were received. Same as the &D0, &D2, and &D3 commands.
CARRIER DETECT OPTIONS. Use the à and Enter buttons to select whether CD will be forced high (CD FORCED ON) or whether it will go high when the remote modem’s carrier signal is detected, and go low when the carrier signal is not detected (CD NORMAL). Same as the &C0 and &C1 commands. When using callback security on UNIX systems, select CD LOW IN CB to force CD low until the proper callback security password has been entered or until a disconnect occurs. This prevents the UNIX login prompt from being displayed before the callback security ENTER PASSWORD prompt appears. Select CD NOR- MAL IN CB to disable this feature. Same as the &C5 and &C4 commands.
CTS OPTIONS. Use the à and Enter buttons to select whether the CTS state will follow the RTS state when on line (CTS NORM) or whether CTS will always be high (CTS ON). Same as the &R0 and &R1 commands.
DIALBACKUP/LL OPTIONS. The following screens are used to configure dial backup for four-wire leased line operation. For more information, see Chapter 7, “Leased Line Operation.”
DIAL BACKUP NUMBER. Use to enter a dial backup number. To scroll through a list of digits and characters, press the á and â buttons. To go to the next position, press the à button. To back up or to exit without saving, press the à button several times. To save the number, press the Enter button. Note: Only 16 characters can be displayed at a time. To see characters 17–30, press the â button. To go to the previous screen, press the ß but­ton. To go to the next screen, press the à button.
TIME TO RESTORE (S15). Sets how frequently leased line restoral attempts occur when the modems are in dial backup mode. The restore time interval can be set from 10 to 255 min­utes in one minute increments. A value of 0 disables dial back­up. Same as the S15= command.
DIALBACKUP TIME (S17). Use to set how long the modem waits after a leased line failure before it attempts a dial backup connection. The timer can be set from 1 to 255 minutes in one minute increments. Same as the S17= command.
ß
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CALLBACK SECURITY. Use the à and Enter buttons to turn callback security on or off. Same as the #DB0 and #DB1 commands. For more information about callback security, see Chapter 6, “Callback Security.”
S-REGISTER OPTIONS. Use the à, â, and Enter buttons to display the current S-register values and enter new values. Same as the Sr? and Sr=n commands.
3 Using the Front Panel
PASSWORD SETUP. Use to enter callback security passwords in memory locations 1–30. Each password must be six to ten characters in length. To scroll through a list of digits and charac­ters, press the áß and â buttons. To go to the next position, press the à button. To back up or to exit without saving, press the à button several times. To save the password, press the
Enter button. Same as the #CBP= command.
CALLBACK NUMBER. Use to enter callback security phone
numbers in memory locations 1–30. Each number can be up to 30 characters long. Same as the #CBN= command. Note: Only 16 characters can be displayed at a time. To see characters 17–30, press the â button. To go to the previous screen, press the ß but­ton. To go to the next screen, press the à button.
VIEW S-REGISTER SETTINGS. Use the à, â, áß, and Enter buttons to select the number of the S-register whose value you want displayed. To scroll through a list of digits, press the á and â buttons. To go to the next position, press the à button. To back up or to exit without saving, press the à button sever­al times. To display the value, press the Enter button. Same as the Sr? command.
ß
SET S-REGISTER. Use the à, â, áß, and Enter buttons to select the number of the S-register whose value you want to change, and the value you want to enter. To scroll through a list of digits, press the áß and â buttons. To go to the next posi­tion, press the à button. To back up or to exit without saving, press the à button several times. Same as the Sr=n command.
MONITOR OPTIONS. Use the à, â, and Enter buttons to display line quality and the line signal-to-noise ratio.
LINE QUALITY. Use the à and Enter buttons to display line signal quality as a three-digit number. The higher order byte of the EQM value is displayed. Based on the EQM value, retrain or fallback/fall forward may be initiated if enabled by %E1 or %E2. Same as the %Q command.
SIGNAL TO NOISE RATIO. Use the à and Enter buttons to display the line signal-to-noise ratio in dB.
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Remote Configuration Options
The following screens are used to configure remote configuration options. For more information about remote configuration, see Chapter 5, “Remote Configuration.”
Diagnostic Options
Use the following screens to turn loopback tests on and off. For information about how to apply these tests, see Appendix C, “Loopback Tests.”
3 Using the Front Panel
ENABLE/DISABLE R.C. Use the à and Enter buttons to turn remoteconfiguration on or off.
REMOTE CONFIG. PASSWORD. Use to enter the remote con­figuration password. To scroll through a list of digits and char­acters, press the áß and â buttons. To go to the next position, press the à button. To back up or to exit without saving, press the à button several times. To save the password, press the
Enter button.
ANALOG LOOPBACK. Press the à and Enter buttons to start
the analog loopback test. The TEST IN PROGRESS screen appears. To stop the test, press the à and Enter buttons again.
Phone Number Memory Options
Use the following screens to list, enter, and dial stored phone numbers. Up to four phone numbers can be stored. The number in memory location 0 is used for DTR dialing, if DTR dialing is enabled. Note: Only 16 characters can be displayed at a time. To display characters 17–30, press the â button. To go to the previous screen, press the ß button. To go to the next screen, press the à button.
DIGITAL LOOPBACK. Press the à and Enter buttons to start the local digital loopback test. The TEST IN PROGRESS screen appears. To stop the test, press the à and Enter buttons again. Same as the &T3 command.
REMOTE DIGITAL LOOPBACK. Press the à and Enter but­tons to start the remote digital loopback test. The TEST IN
PROGRESS screen appears. To stop the test, press the à and Enter buttons again. Same as the &T6 command.
LIST PHONE NUMBERS. Press the à button several times to
display the phone number stored in each memory location.
ENTER PHONE NUMBERS. Use to store up to four phone numbers in memory locations 0–3. Each number can have up to 30 characters. To scroll through a list of digits and characters, press the áß and â buttons. To go to the next position, press the à button. To back up or to exit without saving, press the à button several times. To save the number, press the Enter but- ton. Same as the &Z= commands.
DIAL STORED NUMBERS. Press the à and Enter buttons to dial a stored phone number. Same as the DS= commands.
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Caller ID Options
Press the à and Enter buttons to enable formatted (FCID) or unformatted (UCID) Caller ID, or to disable Caller ID altogether. Same as the #CID=0, #CID=1, and #CID=2 commands.
Note: Because Caller ID information is sent between the first and second ring, regis­ter S0 must be set to 2 or more rings for the modem to receive Caller ID information.
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4
AT Commands,
S-Registers &
Result Codes
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Introduction

AT commands are used to control the operation of your modem. They are so called because each command must be preceded by the characters AT to get the ATtention of the modem.
AT commands can be issued only when the modem is in command mode or online command mode. The modem is in command mode whenever it is not connected to another modem. The modem is in data mode whenever it is connected to another mo­dem and ready to exchange data. Online command mode is a temporary state in which you can issue commands to the modem while connected to another modem. To put the modem into online command mode from data mode, you must issue an escape
sequence (+++) followed immediately by the AT characters and the command, e.g., +++ATH to hang up the modem. To return to data mode from online command
mode, you must issue the command ATO.
To send AT commands to the modem you must use a communications program, such as the HyperTerminal applet in Windows 95, 98, and NT 4.0, or the Trio com­munications program included with your modem. You can issue commands to the modem either directly, by typing them in the terminal window of the communica­tions program, or indirectly, by configuring the operating system or communica­tions program to send the commands automatically. Fortunately, communications programs make daily operation of modems effortless by hiding the commands from the user. Most users, therefore, need to use AT commands only when reconfiguring the modem, e.g., to turn autoanswer on or off.
4 AT Commands, S-Registers, and Result Codes
The format for entering an AT command is ATXn, where X is the command and n is the value for the command, sometimes called the command parameter. The value is always a number. If the value is zero, you can omit it from the command; thus, AT&W is equivalent to AT&W0. Most commands have a default value, which is the value that is set at the factory. The default values are shown in the “AT Commands” section, which begins on the next page.
You must press ENTER to send the command to the modem. Any time the modem receives a command, it sends a response known as a result code. The most common result codes are OK, ERROR, and the CONNECT messages that the modem sends to the computer when it is connecting to another modem. For a table of valid result codes, see “Result Codes” at the end of this chapter.
You can issue several commands in one line, in what is called a command string. The command string begins with AT and ends when you press ENTER. Spaces to separate the commands are optional; they are ignored by the command interpreter. The most familiar command string is the initialization string, which is used to configure the modem when it is turned on or reset, or when your communications software calls another modem.
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AT Commands

Command: AT Attention Code Values: n/a Description: The attention code precedes all command lines except A/ and
Command: ENTER Key Values: n/a Description: Press the ENTER or RETURN key to execute most commands.
Command: A Answer Values: n/a Description: Answers an incoming call before the final ring.
Command: A/ Repeat Last Command Values: n/a Description: Repeats the last command string. Do not precede this com-
4 AT Commands, S-Registers, and Result Codes
the escape sequence.
mand with AT. Do not press ENTER to execute.
Command: B Values: n = 0 or 1 Default: 1 Description: B0 Selects ITU-T V.22 mode when the modem is at 300 or 1200
Command: D Values: s = dial string (phone number and dial modifiers) Default: none Description: Dials telephone number s, where s may up to 40 characters
n
Communication Standard Setting
bps.
B1 Selects Bell 212A when the modem is at 300 or 1200 bps.
s
Dial
long and include the following dial string modifiers.
0–9 Digits 0 through 9
* The “star” digit (tone dialing only) # The “pound” digit (tone dialing only)
A–D A, B, C, and D tone digits. Country specific; some countries
may prohibit these digits.
L Redial last number. (Must be placed immediately after ATD.) P Select pulse-dialing until a T is encountered. Affects cur-
rent and subsequent dialing.
T Select tone-dialing until a P is encountered. Affects current
and subsequent dialing.
W Wait for a new dial tone before continuing to dial. (X2 or X4
must be selected.)
, Pause during dialing for time set in register S8. ; Return to command mode after dialing. (Place at end of
dial string.)
! Hook flash. Causes the modem to go on-hook for the time
specified in S29, then off-hook again .
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4 AT Commands, S-Registers, and Result Codes
@ Wait for silence. Causes the modem to wait for 5 seconds of
silence before processing the next part of the command. If silence is not detected within the time set in register S7, the modem returns a NO ANSWER or BUSY code.
^ Toggle data calling tone on or off. Applies only to current
dialing attempt.
& Detect credit card “bong” tone. If the tone is not detected
within the time specified by S7 (US models), the modem aborts the rest of the sequence and hangs up. The character should follow the phone number and precede the user’s call card number, e.g., ATDT1028806127853500
&123456789.
Command: DS= Values: n = 0–3 Default: none Description: Dial a number previously stored in directory number y by the
Command: E Values: n = 0 or 1 Default: 1 Description: E0 Do not echo keyboard input to the terminal.
Command: H Values: n = 0 or 1 Default: 0 Description: H0 Go on-hook (hang up) and terminate any &T test that is in
Command: I Values: n = 0–6 Default: None Description: I0 Display the product code. Example: MT5600BA.
y
Dial Stored Telephone Number
&Zy=x command. Example: ATDS=3.
n
Echo Command Mode Characters
E1 Do echo keyboard input to the terminal.
n
Hook Control
progress.
H1 Go off-hook (make the phone line busy) and enter command
mode.
n
Information Request
I1 Calculate the ROM checksum and display the least significant
byte in decimal format.
I2 Calculate the ROM checksum and compare it to the prestored
checksum, displaying OK if they match, or ERROR if they do not.
I3 Display the controller firmware version (F), the basic model
(V90), the application code (A), and the interface type code (I) in the format VF.FFF-V90_AI. The application codes are D for desk­top and L for low power (PCMCIA). The interface codes are S for serial and P for parallel. Example: V2.210-V90_2M_DLS.
I4 Display the OEM-defined identifier string in either binary or
ASCII format. I5 Display the country code. Example: 022. I6 Display the modem data pump model and internal code version.
Example: RCV56DPF-PLL L8571A Rev 29.00/29.00.
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4 AT Commands, S-Registers, and Result Codes
Command: L Values: n = 1 Default: 1 Description: L1 Select low volume.
Command: L5 Display Legacy Parameters Value: 5 Default: None Description: Displays the current values for the error correction, flow
Command: M Values: n = 0, 1, 2, or 3 Default: 1 Description: M0 Speaker is always off.
n
Monitor Speaker Volume
Note: Use the M command to turn the speaker on or off.
control, data compression, and serial port speed commands.
Example:
atl5
&E2 &E3 &E15 $SB115200
OK
Note: Use the &V command to display the other parameters.
n
Monitor Speaker Mode
M1 Speaker is on until the carrier signal is detected. M2 Speaker is always on when the modem is off-hook. M3 Speaker is off when receiving carrier and during dialing, but
on during answering.
Command: N Values: n = 0 or 1 Default: 1 Description: N0 Disables automode. The modem attempts a handshake at the
n
Modulation Handshake
speed set by S37 or, if S37=0, at the most recently sensed serial
port speed. N1 Enables automode. The modem attempts a handshake at the
speed set by S37 or, if S37=0, at the highest possible speed.
During the handshake, fallback to a lower speed can occur.
Note: Setting the N command automatically sets the <automode>
parameter of the +MS command. N and S37 are provided only
for compatibility with existing software. +MS is the recom-
mended command.
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4 AT Commands, S-Registers, and Result Codes
Command: O Values: 0 or 1 Default: None Description: O0 Exit online command mode and return to online data mode
Command: P Pulse Dialing Values: P, T Default: T Description: Forces pulse (non-touch-tone) dialing until a T command or T
Command: Q Values: n = 0 or 1 Default: 0 Description: Q0 Enable result codes.
Command: S Values: r = S-register number Default: None Description: Selects register Sr as the last register accessed. E.g., S0. The
n
Return Online to Data Mode
without a retrain. Normally used after a +++ escape (see
+++AT<CR> escape sequence). O1 Exit online command mode and return to online data mode
after a retrain.
dial modifier is received.
n
Result Codes Enable/Disable
Q1 Disable result codes.
r
Select Register
command AT? can then be used to read the register, and the
command AT=n can then be used to set the register to value n.
Command: Sr=nSet Register Value Values: r = S-register number; n varies Default: None Description: Sets value of register Sr to n, where n is entered in decimal
format. E.g., S0=1. If the short form AT=n is used, the value is
written to the last accessed S-register.
Command: Sr? Read Register Value Values: r = S-register number Default: None Description: Reads value of register Sr and display it in 3-digit decimal
format. E.g., S2? gives the response 043. If the short form AT?
is used, the last accessed S-register is read.
Command: T Tone Dialing Values: P, T Default: T Description: Forces DTMF (touch-tone) dialing until a P command or P dial
modifier is received.
Command: V Values: n = 0 or 1 Default: 1 Description: V0 Displays result codes as digits (terse response).
n
Result Code Format
V1 Displays result codes as words (verbose response).
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4 AT Commands, S-Registers, and Result Codes
Command: W Values: n = 0, 1, or 2 Default: 0 Description: W0 The CONNECT result code reports the serial port speed only.
Command: X Values: n = 0–4 Default: 4 Description: This command selects which subset of the result messages will
n
Connect Message Control
W1 The CONNECT result code reports the line speed, the error
correction protocol, and the serial port speed, respectively. W2 The CONNECT result code reports the line speed only.
Note: See also the \V command
n
Result Code Selection
be used by the modem to inform the computer of the results of
commands. X0 Sends OK, CONNECT, RING, NO CARRIER, ERROR and NO
ANSWER; does not look for dial tone or busy signal. X1 Sends X0 messages and connect speed; does not look for dial
tone or busy signal. X2 Sends X1 messages with NO DIALTONE; does not look for
busy signal. X3 Sends X1 messages with BUSY; does not look for dial tone. X4 Sends all messages, including NO DIALTONE and BUSY.
Note: If the modem is in fax mode, the only message sent to
indicate a connection is CONNECT without a speed indication.
See also the \V command.
Command: Y Values: n = 0 or 1 Default: 0 Description: Y0 Disables sending or responding to a long space break signal on
Command: Z Values: n = 0 or 1 Default: None Description: The modem performs a soft reset and restores (recalls) the con-
n
Long Space Disconnect
disconnect. Y1 Enables long space disconnect. In non-error correction mode,
the modem sends a long space of four seconds prior to going
on-hook. In non-error correction mode, the modem responds
to the receipt of a long space (i.e., a break signal greater than
1.6 seconds) by going on-hook.
n
Modem Reset
figuration profile according to the parameter supplied. If no
parameter is specified, zero is assumed. Z0 Resets modem and restores Profile 0. Z1 Resets modem and restores Profile 1.
Note: See also the &F and &W commands.
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Command: &CnData Carrier Detect (DCD) Control Values: n = 0 or 1, 2 or 3, 4 or 5 Default: 1, 3, 4 Description: &C0 Forces the DCD circuit to always be high.
Command: &DnData Terminal Ready (DTR) Control Values: n = 0, 1, 2, or 3 Default: 2 Description: This command interprets the high to low transition of the DTR
4 AT Commands, S-Registers, and Result Codes
&C1 DCD goes high when the remote modem’s carrier signal is de-
tected, and goes low when the carrier signal is not detected. &C2 DCD goes high 500 milliseconds after the CONNECT message is
generated. &C3 DCD goes high when the CONNECT message is generated. &C4 Disables &C5 command. &C5 On UNIX systems, holds DCD low until the proper callback
security password has been entered or until a disconnect occurs.
This prevents the UNIX login prompt from being displayed be-
fore the callback security ENTER PASSWORD prompt appears.
signal sent by the computer according to the supplied param-
eter. The action taken depends on the current &Q setting. &D0 &Q0, &Q5, &Q6: DTR is ignored (assumed high). Allows op-
eration with computers that do not provide DTR.
&Q1: DTR drop causes the modem to hang up. Autoanswer is
not affected.
&Q2, &Q3: DTR drop causes the modem to hang up. Autoan-
swer is inhibited. &D1 &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 dis-
connecting.
&Q2, &Q3: DTR drop causes the modem to hang up. Autoan-
swer is inhibited. &D2 &Q0–&Q6: DTR drop causes the modem to hang up. Autoan-
swer is inhibited. &D3 &Q0, &Q1, &Q5, &Q6: DTR drop causes the modem to per-
form a soft reset as if the Z command were received. The &Y set-
ting determines which profile is loaded.
&Q2, &Q3: DTR drop causes the modem to hang up. Autoan-
swer is inhibited.
&Q5 or &Q6 and +FCLASS=1 or +FCLASS=2: Same as for &Q0.
Note: If &D1, &D2, or &D3 is set, the modem will not dial
without a DTR drop.
Command: &EnV.42 Error Correction Modes Values: n = 0, 1, or 2 Default: 1 Description: &E0 V.42 non-error correction mode (V.42 disabled).
&E1 V.42 auto-reliable mode. &E2 V.42 reliable mode (V.42 enabled).
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Command: &EnModem-Initiated Flow Control Values: n = 3, 4, or 5 Default: 4 Description: &E3 Flow control disabled.
Command: &E Values: n = 14 or 15 Default: 15 Description: &E14 V.42bis data compression disabled.
4 AT Commands, S-Registers, and Result Codes
&E4 CTS/RTS hardware flow control. &E5 XON/XOFF software flow control.
Note: See also the L5 and &K commands.
n
V.42bis Data Compression
&E15 V.42bis data compression enabled.
Note: This command controls only V.42bis data compression,
whereas the %C command controls both V.42bis and MNP-5
data compression. The command in effect is the one last en-
tered. See also the L5 command.
Command: &FnLoad Factory Settings Values: n = 0 or 1 Default: None Description: &F0 Load factory configuration 0.
&F1 Load factory configuration 1.
Note: See also the Z, L5, and &V commands.
Command: &GnV.22bis Guard Tone Control Values: n = 0, 1, or 2 Default: Varies by country Description: &G0 Disables guard tone.
&G1 Sets guard tone to 550 Hz. &G2 Sets guard tone to 1800 Hz.
Note: The &G command is not used in North America, and
may not be permitted in some countries.
Command: &JnTelephone Jack Control Values: n = 0 or 1 Default: None Description: &J0 NA
&J1 NA
Note: This command is included only for compatibility. It per-
forms no function except to load the S-register. The parameter
value, if valid, is written to S21 bit 1.
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Command: &KnFlow Control Selection Values: n = 0, 3, 4, 5, or 6 Defaults: 3 (data modem mode)
Description: &K0 Disables flow control.
Command: &M Values: n = 0–3 Default: 0 Description: This command determines the DTR operating mode. The mo-
4 AT Commands, S-Registers, and Result Codes
6 (fax modem and voice modes)
&K3 Enables CTS/RTS hardware flow control. &K4 Enables XON/XOFF software flow control. &K5 Enables transparent XON/XOFF flow control. &K6 Enables both RTS/CTS and XON/XOFF flow control.
Note: See also the &E command
n
Communications Mode
dem treats the &M command as a subset of the &Q command. &M0 Selects direct asynchronous operation. Note that the command
sequence &M0\N0 selects normal buffered mode, but the
command sequence \N0&M0 selects direct mode. This is be-
cause the \N0 command is analogous to the &Q6 command. &M1 Selects synchronous connect mode with asynchronous offline
command mode. &M2 Selects synchronous connect mode with asynchronous offline
command mode. Same as &M1 except that &M2 enables DTR
dialing of directory slot 0. The modem disconnects if DTR is
low for more than the period stored in S25. &M3 Selects synchronous connect mode. This mode allows 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.
Command: &Q Values: n = 0–3, 5, 6 Default: 5 Description: This command is an extension of the &M command, and is used
n
Sync/Async Mode
to control which connection modes are permitted. It is used in
conjunction with S36 and S48. (See also the \N command.) &Q0 Selects direct asynchronous operation. See &M0. &Q1 Selects synchronous connect mode with asynchronous offline
command mode. See &M1. (Serial interface operation only.) &Q2 Selects synchronous connect mode with asynchronous offline
command mode and enables DTR dialing of directory 0. See
&M2. (Serial interface operation only.) &Q3 Selects synchronous connect mode with asynchronous offline
command mode and enables DTR to act as a talk/data switch.
See &M3. (Serial interface operation only.) &Q5 The modem will try to negotiate an error-corrected link. The
modem can be configured using S36 to determine whether a
failure will result in the modem disconnecting or falling back
to a non-error-correction connection. See also \N3. &Q6 Selects asynchronous operation with speed buffering and no
error correction. Same as \N0.
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Command: &RnClear to Send (CTS) Control Values: n = 0 or 1 Default: 1 Description: &R0 Let the CTS state follow the RTS state when online..
Command: &S Values: n = 0 or 1 Default: 0 Description: &S0 Force DSR high (on) at all times.
4 AT Commands, S-Registers, and Result Codes
&R1 Force CTS high (ON).
Note: This command applies only in synchronous mode.
n
Data Set Ready (DSR) Control
&S1 Let DSR go high only during a connection.
Command: &T Values: n = 0, 1, 3, 4, 5, 6, 7, or 8 Default: None Description: The modem can perform selected test and diagnostic functions. A
n
V.54 Test Commands
test can be run only when the modem is in asynchronous op-
eration in non-error-correction mode (normal or direct mode).
For tests 3, 6, and 7, a connection between the two modems
must first be established. To terminate a test in progress, the
escape sequence (+++) must be entered first, except for param-
eters 7 and 8. If S18 is non-zero, a test terminates automatically
after the time specified by S18 and displays the OK message.
&T0 Abort. Stop any test in progress. &T1 Start local analog loopback, V.54 Loop 3. If a connection exists
when this command is issued, the modem hangs up. A CON-
NECT message is displayed at the start of the test. &T3 Start local digital loopback, V.54 Loop 2. If no connection exists,
ERROR is returned. &T4 Enables acknowledgment for remote digital loopback request. &T5 Ignores acknowledgment for remote digital loopback request. &T6 Requests a remote digital loopback, V.54 Loop 2, without self-
test. If no connection exists, ERROR is returned. The CON-
NECT XXXX message is displayed at the start of the test. &T7 Requests a remote digital loopback, V.54 Loop 2, with self-test.
(In self-test, a test pattern is looped back and checked by the
modem.) If no connection exists, ERROR is returned. When the
test is terminated, the number of detected errors is reported to
the computer. &T8 Starts local analog loopback, V.54 Loop 3, with self-test. If a
connection exists, the modem hangs up before the test begins.
When the test is terminated, the number of detected errors is
reported to the computer.
Command: &V0 Display Current Configuration Values: 0 Default: None Description: Displays the current (active) configuration.
Note: See also the L5 command.
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Command: &V1 Display Last Connection Statistics Values: 1 Default: None Description: Displays statistics for the last connection. Not available in all
Command: &W Values: n = 0 or 1 Default: None Description: &W0 Stores current modem settings in nonvolatile memory as Profile 0.
Command: &XnSynchronous Clock Source Values: n = 0, 1, or 2 Default: 0 Description: Selects the source of the transmit clock for synchronous mode.
4 AT Commands, S-Registers, and Result Codes
versions.
n
Store Current Configuration
Profile 0 is loaded instead of the factory defaults at power-on
(if &Y0 is set) and by the ATZ command. &W1 Stores current modem settings in nonvolatile memory as Profile 1.
Profile 1 is loaded instead of the factory defaults at power-on
(if &Y1 is set) and by the ATZ1 command.
Note: See also the Z, &F, and &Y commands.
In asynchronous mode, the transmit and receive clocks are
turned off. In synchronous mode, the clocks are turned on with
a frequency of 1200 Hz or faster corresponding to the speed
that is selected for modem operation. &X0 Selects internal timing. The modem generates the transmit
clock signal and applies it to the TXCLK output at the serial
interface. &X1 Selects external timing. The local DTE sources the transmit clock
signal on the XTCLK input of the serial interface. The modem
applies this clock to the TXCLK output at the serial interface &X2 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
Command: &YnSelect Profile for Hard Reset Values: n = 0 or 1 Default: None Description: &Y0 Select profile 0 to be loaded on power-up.
&Y1 Select profile 1 to be loaded on power-up.
Note: See also the &W and Z commands.
Command: &Zy=xStore Telephone Number Values: y = 0–3
x = Dialing command
Default: None Description: Stores telephone dial string x in memory location y. Each tele-
phone number dial string can contain up to 30 digits. Dial the
stored number using the DS=y command.
Note: DTR dialing uses the number stored in memory location 0.
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Command: %CnData Compression Control Values: n = 0, 1, 2, or 3 Default: 3 Description: Enables or disables data compression negotiation. The modem
Command: %EnLine Quality Monitor Values: n = 0, 1, or 2 Default: 2 Description: Controls whether or not the modem will automatically moni-
4 AT Commands, S-Registers, and Result Codes
can only perform data compression on an error-corrected link. %C0 Disables data compression. %C1 Enables MNP 5 data compression negotiation. %C2 Enables V.42bis data compression negotiation. %C3 Enables both V.42bis and MNP 5 data compression negotiation.
Note: This command controls both V.42bis and MNP-5 data
compression, whereas the &E14 and &E15 commands control
only V.42bis data compression. The command in effect is the
one last entered.
tor the line quality and request a retrain (%E1) or fall back to a
lower speed when line quality is insufficient and fall forward
to a faster speed when line quality is sufficient (%E2). %E0 Disable line quality monitor and auto-retrain. %E1 Enable line quality monitor and auto-retrain. %E2 Enable line quality monitor and fallback/fall forward.
Command: %L Line Signal Level Values: None Default: None Description: %L Returns a value that indicates the received signal level in dBm.
The value returned is a direct indication (DAA-dependent) of
the receive level at the MDP, not at the telephone line connector.
Examples: 009 = -9 dBm, 043 = -43 dBm, and so on.
Command: %Q Line Signal Quality Values: None Default: None Description: %Q Reports line signal quality (DAA-dependent) as a three-digit
number. 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.
Command: %U PCM Code Selection Values: n = 0 or 1 Default: 0 Description: Specifies the PCM code type for 56K modulation. Note, how-
ever, that the modem automatically selects the code type if the
server sends the proper ID. %U0 Selects µ-Law coding—used in North America and Japan. %U1 Selects A-Law coding—used outside North America and Japan.
Note: See also the +MS= command.
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4 AT Commands, S-Registers, and Result Codes
Command: \A Values: n = 0, 1, 2, or 3 Default: 1 Description: \A0 64-character maximum block size.
Command: \B Values: n = 0–9 in 100 ms units Default: 3 Description: In non-error-correction mode only, sends a break signal of the
Command: \K Values: n = 0–5 Default: 5 Description: Controls the response of the modem to a break received from
n
Maximum MNP Block Size
\A1 128-character maximum block size. \A2 192-character maximum block size. \A3 256-character maximum block size.
n
Transmit Break
specified length to a remote modem. Works in conjunction
with the \K command.
n
Break Control
the computer, the remote modem, or the \B command. The
response is different for each of three different states.
Data mode. The modem receives the break from the computer: \K0 Enter online command mode; no break sent to the remote
modem. \K1 Clear data buffers and send break to the remote modem. \K2 Same as \K0. \K3 Send break immediately to the remote modem . \K4 Same as \K0. \K5 Send break to the remote modem in sequence with the trans-
mitted data.
Data mode. The modem receives the break from the remote
modem during a non-error-corrected connection: \K0 Clear data buffers and send break to the computer. \K1 Same as \K0. \K2 Send break immediately to the computer. \K3 Same as \K2. \K4 Send break to the computer in sequence with the received data. \K5 Same as \K4.
Online command mode. The modem receives a \Bn command
from the computer: \K0 Clear data buffers and send break to the remote modem. \K1 Same as \K0. \K2 Send break immediately to the remote modem. \K3 Same as \K2. \K4 Send break to the remote modem in sequence with the trans-
mitted data. \K5 Same as \K4.
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4 AT Commands, S-Registers, and Result Codes
Command: \N Values: n = 0–5 Default: 3 Description: \N0 Normal (non-error correction) mode with data buffering.
Command: \V Values: n = 0 or 1 Default: 0 Description: \V0 Disables single line connect message. Connect messages are
n
Error Correction Mode Selection
(Forces &Q6.) \N1 Direct mode. Equivalent of &M0 and &Q0 modes. (Forces &Q0.) \N2 V.42/MNP reliable (error-correction) mode. The modem at-
tempts first a V.42 connection and then an MNP connection.
Failure to make a reliable connection results in the modem
hanging up. (Forces &Q5, S36=4, and S48=7.) \N3 V.42/MNP auto-reliable mode. The modem attempts first to
connect in V.42 mode, then in MNP mode, and finally in non-
error-correction mode with data buffering. (Forces &Q5, S36=7,
and S48=7.) \N4 V.42 (LAPM) reliable mode.If the modem cannot make a V.42
connection, it disconnects. (Forces &Q5 and S48=0.) Note: The
-K1 command can override the \N4 command.
\N5 MNP reliable mode.If the modem cannot make an MNP con-
nection, it disconnects. (Forces &Q5, S36=4, and S48=128.)
n
Single Line Connect Message
controlled by the X, W, and S95 settings. \V1 Enables single line connect messages in the format: CONNECT
<Serial Port Speed></Modulation></Protocol></Compression>
</Line Speed>/<Voice and Data>. Overrides the X, W, and S95
commands. Connect messages are displayed in the single line
format subject to the commands V and Q. In non-verbose
mode (V0), single line connect messages are disabled and a
single numeric result code is generated for CONNECT.
Command: +MS= Modulation Selection Values: See description. Default: See description. Description: This extended-format command selects modulation and, op-
tionally, enables or disables automode, specifies the lowest and
highest connection rates, selects µ-Law or A-Law codec type,
and specifies the highest transmit rate using one to five
subparameters.
The command format is
+MS=[mod][,[automode][,[min_RX_rate][,[max_RX_rate][,[x_law]
[,[reserved][,[max_TX_rate]]]]]]]<CR>
Subparameters that are not entered retain their current value.
Commas separate optional subparameters, and should be in-
serted to skip a subparameter. Example: +MS=,0,<CR> disables
automode and keeps all other settings at their current values.
+MS? Reports current options in the format
mod,automode,min_RX_rate,max_RX_rate,x_law,reserved,max_TX_rate.
Example: 56,1,300,56000,0,0,33600.
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4 AT Commands, S-Registers, and Result Codes
+MS=? Reports supported options in the format (list of supported mod
values),(list of supported automode values),(list of supported
min_RX_rate values),(list of supported max_RX_rate values),
(list of supported x_law values), (list of supported reserved
values),(list of supported max_TX_rate values).
Example: (0,1,2,3,9,10,11,56,64,69),(0,1),(300-33600),(300-
56000),(0,1),(0,1),(300-33600).
Subparameters
mod A decimal number that specifies the preferred modula-
tion (automode enabled) or the modulation to use in originat-
ing or answering a connection (automode disabled).
<mod>
Notes:
1. See optional <automode>, <min_RX_rate>, <max_RX_rate>, and <max_TX_rate>
2. Selects V.90 modulation as first priority. If a V.90 connection cannot be established,
3. Selects K56flex modulation as first priority. If a K56flex connection cannot be
Modulation
0 1 2 3 9 10 11
12
56
64 69
V.21 V.22 V.22bis V.23 V.32 V.32bis V.34
2
V.90
3
K56flex
Bell 103 Bell212
subparameters.
the modem attempts K56flex, V.34, V.32bis, etc. (Default.)
established, the modem attempts V.90, V.34, V.32bis, etc.
Possible rates (bps)
300 1200 2400 or 1200 1200 9600 or 4800 14400, 12000, 9600, 7200, or 4800 33600, 31200, 28800, 26400, 24000, 21600,19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333. 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, or 28000
56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000, 40000, 38000, 36000, 34000, or 32000
300 1200
1
automode An optional numeric value that enables or disables
automatic modulation negotiation using V.8 bis/V.8 or V.32
bis Annex A. The options are:
0 = Disable automode
1 = Enable automode (default)
min_RX_rate An optional number that specifies the lowest
rate at which the modem may establish a receive connection.
The value is decimal coded in units of bps, e.g., 2400 specifies
the lowest rate to be 2400 bps. See “Possible rates” in the mod
table. The default is 300 for 300 bps.
max_RX_rate An optional number that specifies the highest
rate at which the modem may establish a receive connection.
The value is decimal coded in units of bps, e.g., 28800 specifies
the highest rate to be 28800 bps. See “Possible rates” in the mod
table. The default is 56000, for 56000 bps.
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Command: -KnMNP Extended Services Values: n = 0, 1, or 2 Default: 0 Description: Enables or disables conversion of a V.42 LAPM connection to
4 AT Commands, S-Registers, and Result Codes
x_law An optional number that specifies the PCM code type
for 56K modulation. The options are:
0 = µ-Law—used in North America and Japan (default)
1 = A-Law—used outside North America and Japan
The modem automatically selects A-Law or µ-Law if the server
sends the Conexant ID. Note that the ATZ command restores
the x_law value from NVRAM. You can also manually select
A-Law or µ-Law using the %U command.
reserved Must not be changed from the default value of 0.
max_TX_rate An optional number that specifies the highest
rate at which the modem may establish a transmit connection.
The value is decimal coded in units of bps, e.g., 33600 specifies
the highest rate to be 33600 bps. See “Possible rates” in the mod
table. The default is 33600, for 33600 bps.
an MNP 10 connection.
-K0 Disables V.42 LAPM to MNP 10 conversion.
-K1 Enables V.42 LAPM to MNP 10 conversion.
-K2 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP
Extended Services initiation during V.42 LAPM answer mode
detection phase.
Command: -SDR=nDistinctive Ring Control Values: 0–7 Default: 0 Description: This command enables or disables detection and reporting of
distinctive ring. One, two, or three distinctive ring types can be
simultaneously enabled depending upon the value of n. The
detected ring type is reported in the verbose result code by ap-
pending the ring type number to the end of the RING message.
-SDR=0 Disables distinctive ring. Any valid ring detected is reported as RING.
-SDR=1 Enables distinctive ring type 1.
-SDR=2 Enables distinctive ring type 2.
-SDR=3 Enables distinctive ring types 1 and 2.
-SDR=4 Enables distinctive ring type 3.
-SDR=5 Enables distinctive ring types 1 and 3.
-SDR=6 Enables distinctive ring types 2 and 3.
-SDR=7 Enables distinctive ring types 1, 2, and 3.
The supported ring types and ring cadence detection criteria are shown in the following table:
Distinctive
ring type
1 2 3
Ring cadence detection criteria
2.0 sec. on, 4.0 sec. off
0.8 sec. on, 0.4 sec. off, 0.8 sec. on, 0.4 sec. off
0.4 sec. on, 0.2 sec. off, 0.4 sec. on, 0.2 sec. off, 0.8 sec. on, 0.4 sec. off
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4 AT Commands, S-Registers, and Result Codes
Command: ** Values: n = 0, 1, or 2 Description: **0 Initiate download to flash memory at the last sensed speed.
Command: *B View Numbers in Blacklist Values: n/a Description: If blacklisting is in effect, AT*B displays a list of numbers for
Command: *D View Delayed Numbers Values: n/a Description: AT*D displays a list of delayed numbers, as defined in the *B
Command: #CBNy=[-]xStore Callback Number Values: y = 01–30
Default: None Description: Stores the callback dialing string x in memory location y. The
n
Flash Memory Download
**1 Initiate download to flash memory at 38.4K bps. **2 Initiate download to flash memory at 57.6K bps.
which the last call attempted in the previous two hours failed. Permanently forbidden numbers as defined by country re­quirements do not appear in this list. If no numbers are black­listed, only the OK result code is displayed.
command, together with their delay times. If no numbers are delayed, only the OK result code is displayed.
x = dialing string
dialing string can include the digits 0 through 9 and any of the following characters: #, *, comma (,), semicolon (;), W, A, B, C, and D. Up to 30 characters can be used. Example: AT#CBN01=9,16127853000. If the optional - character precedes the dialing string, and the caller appends the same character to the password, the caller is immediately connected, and the hangup and callback are skipped.
Command: #CBPy=xStore Callback Password Values: y = 01–30
x = password (6–10 characters)
Default: None Description: Stores callback security password x in memory location y. The
password must have 6 to 10 characters. Example:
AT#CBP01=gilgamesh.
Note: A direct connect password may not end with a hyphen (-).
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Command: #CID=nCaller ID Values: n = 0, 1, or 2 Default: 0 Description: Enables or disables Caller ID recognition and reporting.
Command: #DB Values: n = 0 or 1 Default: 0 Description: Enables or disables callback security. When callback security is
4 AT Commands, S-Registers, and Result Codes
#CID=0 Disables Caller ID. #CID=1 Enables formatted Caller ID reporting of ICLID SDM (Single
Data Message) and MDM (Multiple Data Message) packets.
#CID=2 Enables unformatted Caller ID reporting of any ICLID packet
received after the first RING cycle, including SDM, MDM, or call waiting packets.
#CID? Retrieves the current Caller ID mode from the modem. #CID=? Returns the mode capabilities of the modem in a list with each
element separated by commas.
n
Callback Enable/Disable
enabled, phone number memory locations 0–4, used for quick dialing and DTR dialing, become unavailable and are replaced by callback security memory locations 1–30. The phone num­ber memory locations and their contents are restored when callback security is disabled.
#DB0 Disables callback security. #DB1 Enables callback security.
Command: $SB Values: n = speed in bits per second Default: 57600 Description: $SB300 Set serial port to 300 bps.
Command: +++AT<CR> Escape Sequence Values: n/a Description: Puts the modem in command mode (and optionally issues a
n
Serial Port Baud Rate
$SB1200 Set serial port to 1200 bps. $SB2400 Set serial port to 2400 bps. $SB4800 Set serial port to 4800 bps. $SB9600 Set serial port to 9600 bps. $SB19200 Set serial port to 19200 bps. $SB38400 Set serial port to 38400 bps. $SB57600 Set serial port to 57600 bps. $SB115200 Set serial port to 115200 bps. $SB230400 Set serial port to 230400 bps.
Note: See also the L5 command.
command) while remaining online. Type +++AT and up to ten command characters, and then press ENTER. Used mostly to is­sue the hang-up command: +++ATH<CR>.
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S-Registers

Certain modem values, or parameters, are stored in memory locations called S­registers. Use the S command to read or alter the contents of S-registers (see previ­ous section).
Register Unit Range Default Description
S0 1 ring 0, 1–255 1 Sets the number of rings before the modem
S1 1 ring 0–255 0 Counts the rings that have occurred.
S2 decimal 0–127 43 (+) Sets ASCII code for the escape sequence
S3 decimal 0–127 13 (^M) Sets the ASCII code for the carriage return
S4 decimal 0–127 10 (^J) Sets the ASCII code for the line feed
4 AT Commands, S-Registers, and Result Codes
answers. ATS0=0 disables autoanswer completely.
128–255 character. Values greater than 127 disable
escape.
character.
character.
S5 decimal 0–32 8 (^H) Sets the ASCII code for the backspace
33–127 character. Values greater than 32 disable
backspace.
S6 seconds 2–255 2 Sets the time the modem waits after it goes
off-hook before it begins to dial the phone number.
S7 seconds 1–255 50 Sets the time the modem waits for a carrier
signal before aborting a call. Also sets the wait for silence time for the @ dial modifier, and the time the modem waits for the dial tone after encountering W in the dial string.
S8 seconds 0–255 2 Sets the length of the pause caused by a
comma character in a dialing command.
S9 100 ms 1–255 6 Sets the time, in tenths of a second, that the
carrier must be present before the modem considers it valid.
S10 100 ms 1–255 14 Sets how long a carrier signal must be lost
before the modem disconnects.
S11 1 ms 50–255 95 Sets spacing and duration of dialing tones.
S12 20 ms 0–255 50 Defines the maximum period, in fiftieths of
second, allowed between receipt of the last character of the three escape character sequence from the computer and the send­ing of the OK result code to the computer (escape code guard time).
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Register Unit Range Default Description
S13 decimal 0, 1–127 42 (*) Sets the ASCII code for the remote configu-
S15 minutes 0, 10–255 30 Sets the length of time the modem waits
S17 minutes 0–255 1 Sets the length of time the modem waits af-
S18 seconds 0–255 0 Sets the number of seconds that the modem
S24 seconds 0–255 0 Sets the number of seconds that the modem
4 AT Commands, S-Registers, and Result Codes
ration escape character. ATS13=0&W dis­ables remote configuration.
after making a dial-up connection before it checks the lease line for restoral. A zero value disables dial backup.
ter after a lease line fails before it attempts a dial-up connection.
conducts an &T test before it returns to the command mode. If the value is zero, the test must be terminated from command mode by issuing an &T0 or H command. When S18 is non-zero, the modem returns the OK message upon test termination.
operates in normal mode with no detected telephone or serial port activity before it enters low-power sleep mode. The timer is reset upon any serial port or telephone line activity.
S25 10 ms 0–255 5 Sets the length of time that the modem
(async) ignores DTR while taking the action specified 1 ms by &D. (sync)
S26 10 ms 0–255 1 When &R0 is commanded, sets the time
after detecting an OFF-to-ON transition on RTS before the modem turns CTS ON. Applies to synchronous operation only.
S29 10 ms 0–255 70 Sets the length of time that the modem goes
on-hook when it encounters a flash dial modifier (!) in the dial string.
S30 10 ms 0, 1–255 0 Sets the length of time that the modem
waits before disconnecting when no data is sent or received. A value of zero disables the timer. Applies to asynchronous opera­tion only.
S32 decimal 0–255 17 Sets the ASCII code for the XON character.
S33 decimal 0–255 19 Sets the ASCII code for the XOFF character.
S35 decimal 0–1 0 0 disables, 1 enables the V.25 data calling
tone, which allows remote data/fax/voice discrimination.
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Register Unit Range Default Description
S36 decimal 0–7 7 LAPM Failure Control. Specifies the fall-
4 AT Commands, S-Registers, and Result Codes
back action to take in the event of an LAPM negotiation failure. These fallback options are initiated immediately upon connection if S48 is set to 128. If an invalid number is entered, S36 acts as if the default value has been entered. (See S48.)
0 Modem disconnects. 1 Modem stays online and a direct mode
connection is established. 2 Reserved. 3 Modem stays on-line and a normal
mode connection is established. 4 An MNP connection is attempted and
if it fails, the modem disconnects. 5 An MNP connection is attempted and
if it fails, a direct mode connection is
established. 6 Reserved. 7 An MNP connection is attempted and
if it fails, a normal modem connection
is established.
S37 decimal 0–12 0 Sets the maximum V.34 speed at which the
modem attempts to connect. The default val­ue attempts an automode connection. If N0 is active, connection is attempted at the most recently sensed serial port speed (+MS= command settings are updated to the appro­priate values). If N1 is active, connection is attempted at the highest possible speed. (+MS= settings are updated to 11,1,300,33600 to reflect V.34, automode, 300 bps minimum speed, and 33600 bps maximum speed). Sup­ported only for compatibility with existing software; use the +MS= command instead.
S38 seconds 0–254, 255 20 Sets the delay between the modem’s receipt of
the H command to disconnect (or high-to­low transition of DTR if the modem is pro­grammed to follow the signal), and the disconnect operation. Applies only to error­correction connections. This register can be used to ensure that data in the modem buffer is sent before the modem disconnects. If S38 is set to a value between 0 and 254, the modem waits for the remote modem to ac­knowledge all data in the modem buffer before disconnecting. If S38 is set to 255, the modem does not time out, and continues to attempt to deliver data in the buffer until the connection is lost or the data is delivered.
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Register Unit Range Default Description
S46 decimal 136, 138 138 Enables or disables data compression:
S48 decimal 0, 7, 128 7 Enables or disables LAPM negotiation. An
S86 decimal 0, 3–23 n/a When the modem issues a NO CARRIER
4 AT Commands, S-Registers, and Result Codes
136 Error correction without compression. 138 Error correction with compression.
invalid value is treated as a 128 value.
0 Disables negotiation and proceeds with
LAPM. 7 Enables negotiation.
128 Disables negotiation and proceeds at
once with the fallback action specified
in S36. Can be used to force MNP.
result code, a value is written to this register to help determine the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message. Use the S86? command to read the value.
0 Normal disconnect; no error occurred. 3 Call Waiting caused disconnect. 4 Physical loss of carrier. 5 No error correction at the other end. 6 No response to feature negotiation. 7 This modem is async-only, the other
sync-only. 8 No framing technique in common. 9 No protocol in common.
10 Bad response to feature negotiation. 11 No sync information from remote
modem.
12 Normal disconnect initiated by remote
modem.
13 Remote modem does not respond after
10 retransmissions of the same message.
14 Protocol violation. 15 DTR lost. 15 Three retrains or excessive
retransmissions when no DTR.
16 Received GSTN cleardown. 17 Inactivity timeout. 18 Speed not supported. 19 Long space disconnect. 20 Key abort disconnect. 21 Clears previous disconnect reason. 22 No connection established. 23 Disconnect after three retrains.
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Register Unit Range Default Description
S95 decimal 0–15 0 The bits in this register can be set to over-
4 AT Commands, S-Registers, and Result Codes
ride some of the W command options. A bit set to a 1 in this register enables the corre­sponding result code regardless of the W setting.
Bit 0 CONNECT result code indicates
DCE speed instead of DTE speed.
Bit 1 Append /ARQ to CONNECT XXX
result code in error-correction mode. Bit 2 Enable CARRIER XXXX result code. Bit 3 Enable PROTOCOL XXXX result code. Bit 4 Reserved. Bit 5 Enable COMPRESSION result code. Bit 6 Reserved. Bit 7 Reserved.
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Result Codes

In command mode your modem can send the following responses, called result codes, to your computer. Result codes are used by communications programs and
can also appear on your monitor.
Terse Verbose Description
0OK Command executed 1 CONNECT Modem connected to line 2 RING Ring signal detected 3 NO CARRIER Carrier signal lost or not detected 4 ERROR Invalid command 5 CONNECT 1200 Connected at 1200 bps 6 NO DIALTONE No dial tone detected 7 BUSY Busy signal detected 8 NO ANSWER No answer at remote end 9 CONNECT 0600 Connected at 600 bps 10 CONNECT 2400 Connected at 2400 bps 11 CONNECT 4800 Connected at 4800 bps 12 CONNECT 9600 Connected at 9600 bps 13 CONNECT 7200 Connected at 7200 bps 14 CONNECT 12000 Connected at 12000 bps 15 CONNECT 14400 Connected at 14400 bps 16 CONNECT 19200 Connected at 19200 bps 17 CONNECT 38400 Connected at 38400 bps 18 CONNECT 57600 Connected at 57600 bps 19 CONNECT 115200 Connected at 115200 bps 20 CONNECT 230400 Connected at 230400 bps 22 CONNECT 75TX/1200RX V.23 connection in originate mode 23 CONNECT 1200TX/75RX V.23 connection in answer mode 24 DELAYED Delay is in effect for the dialed number 32 BLACKLISTED Dialed number is blacklisted 33 FAX Connected in fax mode 35 DATA Connected in data mode 40 CARRIER 300 0-300 bps data carrier detected 44 CARRIER 1200/75 V.23 backward channel detected 45 CARRIER 75/1200 V.23 forward channel detected 46 CARRIER 1200 1200 bps data carrier detected 47 CARRIER 2400 2400 bps data carrier detected 48 CARRIER 4800 4800 bps data carrier detected 49 CARRIER 7200 7200 bps data carrier detected 50 CARRIER 9600 9600 bps data carrier detected 51 CARRIER 12000 12000 bps data carrier detected 52 CARRIER 14400 14400 bps data carrier detected 53 CARRIER 16800 16800 bps data carrier detected 54 CARRIER 19200 19200 bps data carrier detected 55 CARRIER 21600 21600 bps data carrier detected 56 CARRIER 24000 24000 bps data carrier detected 57 CARRIER 26400 26400 bps data carrier detected 58 CARRIER 28800 28800 bps data carrier detected 59 CONNECT 16800 Connected at 16800 bps 61 CONNECT 21600 Connected at 21600 bps
4 AT Commands, S-Registers, and Result Codes
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Terse Verbose Description
62 CONNECT 24000 Connected at 24000 bps 63 CONNECT 26400 Connected at 26400 bps 64 CONNECT 28800 Connected at 28800 bps 66 COMPRESSION CLASS 5 Connected with MNP Class 5 data compression 67 COMPRESSION V.42 bis Connected with V.42 bis data compression 69 COMPRESSION NONE Connected without data compression 70 PROTOCOL NONE Connected without any protocol 77 PROTOCOL LAPM Connected in V.42 LAPM mode 78 CARRIER 31200 56000 bps data carrier detected 79 CARRIER 33600 33600 bps data carrier detected 80 PROTOCOL ALT Connected in MNP mode 81 PROTOCOL ALT-CELLULAR Connected in MNP-10 mode 84 CONNECT 33600 Connected at 33600 bps 150 CARRIER 32000 32000 bps data carrier detected 151 CARRIER 34000 34000 bps data carrier detected 152 CARRIER 36000 36000 bps data carrier detected 153 CARRIER 38000 38000 bps data carrier detected 154 CARRIER 40000 40000 bps data carrier detected 155 CARRIER 42000 42000 bps data carrier detected 156 CARRIER 44000 44000 bps data carrier detected 157 CARRIER 46000 46000 bps data carrier detected 158 CARRIER 48000 48000 bps data carrier detected 159 CARRIER 50000 50000 bps data carrier detected 160 CARRIER 52000 52000 bps data carrier detected 161 CARRIER 54000 54000 bps data carrier detected 162 CARRIER 56000 56000 bps data carrier detected 165 CONNECT 32000 Connected at 32000 bps 166 CONNECT 34000 Connected at 34000 bps 167 CONNECT 36000 Connected at 36000 bps 168 CONNECT 38000 Connected at 38000 bps 169 CONNECT 40000 Connected at 40000 bps 170 CONNECT 42000 Connected at 42000 bps 171 CONNECT 44000 Connected at 44000 bps 172 CONNECT 46000 Connected at 46000 bps 173 CONNECT 48000 Connected at 48000 bps 174 CONNECT 50000 Connected at 50000 bps 175 CONNECT 52000 Connected at 52000 bps 176 CONNECT 54000 Connected at 54000 bps 177 CONNECT 56000 Connected at 56000 bps 180 CONNECT 28000 Connected at 28000 bps (V.90 mode) 180 CARRIER 28000 28000 bps data carrier detected (V.90 mode) 181 CONNECT 29333 Connected at 29333 bps (V.90 mode) 181 CARRIER 29333 29333 bps data carrier detected (V.90 mode) 182 CONNECT 30667 Connected at 30667 bps (V.90 mode) 182 CARRIER 30667 30667 bps data carrier detected (V.90 mode) 183 CONNECT 33333 Connected at 33333 bps (V.90 mode) 183 CARRIER 33333 33333 bps data carrier detected (V.90 mode) 184 CONNECT 34667 Connected at 34667 bps (V.90 mode) 184 CARRIER 34667 34667 bps data carrier detected (V.90 mode) 185 CONNECT 37333 Connected at 37333 bps (V.90 mode)
4 AT Commands, S-Registers, and Result Codes
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Terse Verbose Description
185 CARRIER 37333 37333 bps data carrier detected (V.90 mode) 186 CONNECT 38667 Connected at 38667 bps (V.90 mode) 186 CARRIER 38667 38667 bps data carrier detected (V.90 mode) 187 CONNECT 41333 Connected at 41333 bps (V.90) 187 CARRIER 41333 41333 bps data carrier detected (V.90) 188 CONNECT 42667 Connected at 42667 bps (V.90) 188 CARRIER 42667 42667 bps data carrier detected (V.90) 189 CONNECT 45333 Connected at 45333 bps (V.90) 189 CARRIER 45333 45333 bps data carrier detected (V.90) 190 CONNECT 46667 Connected at 46667 bps (V.90) 190 CARRIER 46667 46667 bps data carrier detected (V.90) 191 CONNECT 49333 Connected at 49333 bps (V.90) 191 CARRIER 49333 49333 bps data carrier detected (V.90) 192 CONNECT 50667 Connected at 50667 bps (V.90) 192 CARRIER 50667 50667 bps data carrier detected (V.90) 193 CONNECT 53333 Connected at 53333 bps (V.90) 193 CARRIER 53333 53333 bps data carrier detected (V.90) 194 CONNECT 54667 Connected at 54667 bps (V.90) 194 CARRIER 54667 54667 bps data carrier detected (V.90) +F4 +FCERROR V.21 signal received/high speed fax expected
4 AT Commands, S-Registers, and Result Codes
(V.27, V.29, V.33 or V.17).
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5
Remote
Configuration
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MultiModemII User Guide

Introduction

Remote configuration is a network management tool that allows you to configure modems anywhere in your network from one location. With password-protected remote configuration, you can issue AT commands to a remote MultiModemII mo­dem for maintenance or troubleshooting as if you were on-site.

Basic Procedure

The following steps are valid regardless of whether the connection is established by the local or the remote MultiModemII modem.
1. Establish a data connection with a remote MT5600BA or MT5600BL modem.
2. Send three asterisks to initiate remote configuration. The remote modem responds:
Online Remote Access Remote password:
3. Type the remote configuration password, and then press ENTER. The default is “MULTITECH.” It is not case-sensitive.
5 Remote Configuration
• If the password is incorrect, the word CONNECT appears, and the local modem is returned to online mode.
• If the password is correct, an >AT_ command prompt appears.
4. Type AT commands to configure the remote modem. It is not necessary to precede the commands with “AT.”
5. When you have finished configuring the remote modem, type *E and press ENTER to exit remote configuration mode and return to online data mode. You can now break the connection in the normal way.
Note: The dialing command is not allowed in remote configuration mode.

Setup

Multi-Tech modems are shipped with a default setup password (MULTITECH). Be­cause anyone who has an owner’s manual knows the default setup password, for security you should change the password and possibly also the remote configuration escape character.

Changing the Remote Configuration Password

The remote configuration password can be changed only from the front panel of the modem:
1. Turn on the modem.
2. Starting at the STATUS screen, press â â â à à â à to access the ENTER PASSWORD screen.
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3. To change the password, press áß or â to select the first character of the pass­word, and then press à to go to the next character. Repeat until you have entered the entire password.
4. To cancel the new password, press à until the password is erased. To save the new password, press the Enter button. The next time you remotely configure the modem you must use the new password.

Changing the Remote Escape Character

To improve security, you can change a remote modem’s remote configuration es­cape character. The remote configuration escape character is stored in register S13. The factory default is 42, which is the ASCII code for the asterisk character (*). Set­ting S13 to 0 (zero) disables remote configuration entirely—but if you do this re­motely, you won’t be able to change it back remotely!
1. Establish a remote configuration link with the remote modem as described in “Basic Procedure.”
5 Remote Configuration
2. Type ATS13=n, where n is the ASCII code for the new remote configuration es­cape character, and then press ENTER.
3. Save the new value by typing AT&W and pressing ENTER.
4. Type ATO<CR> to exit remote configuration.
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6
Callback
Security
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MultiModemII User Guide

Introduction

This chapter describes how to use callback security with your modem.
Callback security protects your network from unauthorized access and helps control long distance costs. When callback security is enabled, all callers are requested to enter a password. If the password is invalid, the caller can try twice more before the modem hangs up. If the password is valid, the modem hangs up and returns the call by dialing the phone number associated with the password.
It is possible to implement password protection without callback by storing a hyphen (-) before the callback phone number. The caller must then append a hyphen to his password to establish the direct connection.
The modem can store up to 30 callback phone numbers and 30 callback passwords. Phone numbers can be up to 30 characters long and can contain the pause (,) and wait (W) characters in addition to the digits and characters normally found on a touch-tone keypad. Passwords can be up to 10 characters long.
Callback phone numbers are associated with callback passwords by being assigned to the same callback memory location. For example, if you assign the password “APRICOT” to memory location 16 and, in a separate operation, also assign phone number 6127853000 to memory location 16, the modem calls phone number 6127853000 when it receives the password “APRICOT.”
6 Callback Security
Because there is no way to examine the passwords and phone numbers stored in the modem, it is important to write them down as you enter them. A form that you can print out for this purpose is provided on the last page of this chapter.

Setup Procedures

Turning Callback Security On and Off

Note: Autoanswer must be enabled (S0=1 or S0=2) for callback security to work.
AT Command Method
1. Open a terminal program, such as HyperTerminal.
2. In the terminal window, type one of the following commands:
• To turn on callback security, type AT#DB1 and press ENTER. With remote call-
back security turned on, each caller is asked to enter a password, then is disconnected and called back by the modem. Also, dialing number locations 0–3, for use with the DS=y dialing command, are replaced by callback dialing number locations 1–30.
• To turn off callback security, type AT#DB0 and press ENTER. Callers no longer
need a password to connect to the modem, the modem is unable to call them back, and stored dialing number locations 0–3 become available.
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Front Panel Method
1. Turn on the modem.
2. Starting at the STATUS screen, press the following buttons on the front panel to turn callback security on and off:
• To turn on callback security, press â, â, à, â, â, à, à to display the
CALLBACK ON? option, and then press the Enter button to select the option. When remote callback security is turned on, each caller is asked to enter a password, then is disconnected and called back by the modem. Also, dialing number locations 0–3, for use with the DS=y dialing command, are replaced by callback dialing number locations 1–30.
• To turn off callback security, press â, â, à, â, â, à, à, à to display the
CALLBACK OFF? option, and then press the Enter button to select the option. Callers no longer need a password to connect to the modem, the modem is unable to call them back, and stored dialing number locations 0–3 become available.

Assigning Callback Passwords

6 Callback Security
AT Command Method
1. Open a terminal program, such as HyperTerminal.
2. To store a callback password for the first callback memory location, type AT#CBP01=xxxxxxxxxx, where xxxxxxxxxx is the first password, and press ENTER. The password must be six to ten characters in length.
3. To store a callback password for the second callback memory location, type AT#CBP02=xxxxxxxxxx, where xxxxxxxxxx is the second password, and press ENTER. Note that the memory location number in the command is incremented by one.
4. Repeat as many times as necessary, up to memory location 30, until all pass­words have been entered.
Front Panel Method
1. Turn on the modem.
2. Starting at the STATUS screen, press the following buttons on the front panel: â, â, à, â, â, à, â, à. The ENTER PASSWORD #1? screen appears.
3. Press the Enter button on the front panel to select callback memory location 1. The ENTER PASSWORD screen appears.
4. Press the áß or â button several times to select the first letter in the password.
5. Press the à button to go to the next letter in the password.
Note: To backspace or to cancel an entry, press à several times.
6. The password must be six to ten characters in length. Repeat steps 4 and 5 until the password is entered, and then press the Enter button to store it. The PASS- WORD STORED screen should appear.
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7. Press the Enter button again to go to the PASSWORD SETUP screen.
8. Press à, à to go to the ENTER PASSWORD #2? screen.
9. Repeat steps 3–7 to enter the next password.
10. Repeat as many times as necessary, up to memory location 30, until all pass­words have been entered.
Warning: There is no way to review an entry to confirm that it has been entered cor­rectly. If you attempt to look at a password entry by pressing the Enter button for an ENTER PASSWORD #n? screen, it is possible to accidentally erase the entry.

Assigning Callback Phone Numbers

At Command Method
1. Open a data communication program, such as HyperTerminal.
2. To store a callback phone number in the first memory location, type AT#CBN01=xxxxxxxxxx, where xxxxxxxxxx is the dialing string, and press ENTER. The dialing string can include the digits 0 through 9 and any of the following characters: #, *, comma (,), semicolon (;), W, A, B, C, and D. Up to 30 characters can be used. Example: AT#CBN01=9,16127853000. If a direct connection with password protection, but without hangup and callback, is desired, the first char­acter in the dialing string should be a hyphen (-).
6 Callback Security
3. To store a callback phone number in the second memory location, type
4. Repeat as many times as necessary, through memory location 30, until all dial-
Front Panel Method
1. Turn on the modem.
2. Starting at the STATUS screen, press the following buttons on the front panel:
3. Press the Enter button on the front panel to select memory location 1. The
4. Press the áß or â button several times to select the first character. If a direct
5. Press the à button to go to the next character in the dialing string.
6. The number can be up to 30 characters in length. Repeat steps 4 and 5 until the
AT#CBN02=xxxxxxxxxx, where xxxxxxxxxx is the dialing string, and press ENTER. Note that the memory location number in the command is incremented by one.
ing strings have been entered.
â, â, à, â, â, à, â, â, à. The ENTER NUMBER #1? screen appears.
ENTER NUMBER screen appears.
connection, without hangup and callback, is desired, the first character in the dialing string should be a hyphen (-).
Note: To backspace or to cancel an entry, press à several times.
number is entered, and then press the Enter button to store it. The NUMBER STORED screen should appear.
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7. Press the Enter button again to go to the CALLBACK NUMBER screen.
8. Press à, à to go to the ENTER NUMBER #2? screen.
9. Repeat steps 3–7 to enter the next number.
10. Repeat as many times as necessary, up to memory location 30, until all numbers have been entered.
Warning: There is no way to review an entry to confirm that it has been entered cor­rectly. If you attempt to look at a number entry by pressing the Enter button for an ENTER NUMBER #n? screen, it is possible for you to accidentally erase the entry.

Calling Procedure

Use the following procedure to call a modem that has callback security enabled.
Note: Autoanswer must be enabled on the calling modem (S0=1 or S0=2).
1. Using a data communication program such as HyperTerminal, dial the number of the callback modem.
6 Callback Security
2. When the connection is established, the callback modem responds with a re­quest for a password.
3. Type the password for your modem, and then press ENTER. You have three at­tempts to enter a valid password or be disconnected.
4. If the password is valid, the callback modem disconnects. Then, after a short delay, it calls the number associated with the password and establishes a work­ing connection.
Note: If you are calling a direct connect number, you must append a hyphen (-) to the password. If the corresponding phone number has - as its first character, you will be able to go directly online with the callback modem. If the corresponding phone number has no - character, you will be prompted for a different password.
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Callback Security Commands

The following AT commands are used with callback security.
Command: #DBnCallback Enable/Disable Values: n = 0 or 1 Default: 0 Description: Enables or disables callback security. When callback security is
enabled, phone number memory locations 0–4, used for quick dialing and DTR dialing, become unavailable and are replaced by callback security memory locations 1–30. The phone num­ber memory locations and their contents are restored when callback security is disabled.
#DB0 Disables callback security. #DB1 Enables callback security.
Command: #CBNy=[-]xStore Callback Number Values: y = 01–30
x = dialing string Default: None Description: Stores the callback dialing string x in memory location y. The
dialing string can include the digits 0 through 9 and any of the
following characters: #, *, comma (,), semicolon (;), W, A, B, C,
and D. Up to 30 characters can be used. Example:
AT#CBN01=9,16127853000. If the optional - character precedes
the dialing string, and the caller appends the same character to
the password, the caller is connected immediately, and the
hangup and callback are skipped.
6 Callback Security
Command: #CBPy=xStore Callback Password Values: y = 01–30
x = password (6–10 characters) Defaults: None Description: Stores callback security password x in memory location y. The
password must have 6 to 10 characters.
Note: A direct connect password may not end with a hyphen (-).
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Callback Assignments Form

Location Password Phone number
01 02 03 04 05 06 07 08 09 10
6 Callback Security
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
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7
Leased Line
Operation
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Introduction

This chapter describes how to use the MultiModemII modem on a leased line.
A leased line is a private, permanent, telephone connection between two points. Unlike normal dialup connections, a leased line is always active. The modems auto­matically connect when they are attached to the line and are turned on. Because a leased line is always active, one of the two modems on the line must be configured as the originate modem and the other as the answer modem; however, it does not matter which is which.
In the event of an interruption, leased line modems automatically reconnect when the data line or power is restored. The MT5600BL modem also supports dial backup, which enables the modem to automatically switch to a dial-up connection if the leased line goes down.
The MT5600BA modem supports two-wire leased-line operation, while the MT5600BL modem supports both two-wire and four-wire leased line operation.

Two-Wire Setup

7 Leased Line Operation
1. For two-wire leased line operation on the MT5600BA modem, connect the pro­vided modular telephone cable to the LINE jack. For two-wire leased line op­eration on the MT5600BL modem, connect the provided modular telephone cable to the LEASED jack. Connect the other end of the cable to the two-wire leased line jack or terminals supplied by the telephone company.
2. Turn on the modem.
3. Starting at the STATUS screen, press the following buttons on the front panel: â, à, â, â, â, à. The CURRENT SETTING= screen appears.
4. If the CURRENT SETTING= screen shows ASYNC AT, press áß and go to step 7. If it shows anything else, press à to go to the ASYNC, NORM? screen.
5. Press the Enter button to select normal asynchronous operation.
6. The OPTION SET screen appears. Press áß to exit to the SYNC/ASYNC OPTIONS screen.
7. Press áß, áß, áß, à, à, à, à. The 2 WIRE LEASE? ORIG screen appears.
8. Choose one of two actions:
• To set up the modem as the originate modem, press the Enter button.
• To set up the modem as the answer modem, press à to display the 2 WIRE
LEASE? ANSWER screen, and then press the Enter button.
Note: One of the modems in a leased line pair must be configured as the origi-
nate modem, and the other as the answer modem, but it does not matter which is which.
9. The OPTION SET screen appears. Press áß to exit to the ONLINE OPTIONS screen, or à to exit to the CURRENT SETTING= screen to verify the selection.
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10. This completes the setup for two-wire leased line operation. Upon completion, the modem attempts to connect to the modem at the other end of the leased line. If the remote modem has not yet been configured for leased line operation, you may turn off the local modem until the remote one is ready.

Four-Wire Setup

1. For four-wire leased line operation, connect one of the provided four-wire cables to the LEASED jack on the back of the MT5600BL modem. Connect the other end of the cable to a four-wire leased line jack or terminals supplied by the telephone company.
2. Turn on the modem.
3. Starting at the STATUS screen, press the following buttons on the front panel: â, à, â, â, â, à, à, à, à. The SYNC, NORM? screen appears.
4. Press the Enter button to select normal synchronous operation.
5. The OPTION SET screen appears. Press áß to exit to the SYNC/ASYNC OPTIONS screen.
6. Press áß, áß, áß, à, à, à, à, à, à. The 4 WIRE LEASE? ORIG screen appears.
7 Leased Line Operation
7. Choose one of two actions:
• To set up the modem as the originate modem, press the Enter button.
• To set up the modem as the answer modem, press à to display the
4 WIRE LEASE? ANSWER screen, and then press the Enter button.
Note: One of the modems in a leased line pair must be configured as the origi-
nate modem, and the other as the answer modem, but it does not matter which is which.
8. The OPTION SET screen appears. Press áß to exit to the ONLINE OPTIONS screen, or à to exit to the CURRENT SETTING= screen.
9. This completes the setup for four-wire leased line operation. Upon completion, the modem attempts to connect to the modem at the other end of the leased line. If the remote modem has not yet been configured for leased line operation, you may turn off the local modem until the remote one is ready.
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Dial Backup and Leased Line Restoral

For four-wire leased line operation, the MT5600BL modem has a dial backup capa­bility, in which the modem is connected to a standard dial-up line as well as to the leased line. If the leased line fails, the originate modem automatically dials and con­nects to the answer modem through the standard telephone network. While it is in dial backup mode, the MT5600BL periodically checks the leased line to see if it is op­erational. If the line is operational, the modem then attempts to restore the leased line. If the MT5600BL detects that it is not connected to the standard telephone net­work when the leased line fails, it immediately switches to leased line restoral.
The dial-back timer, register S17, determines how long the modem waits after a leased line failure before it attempts a dial backup connection. The S17 default set­ting is one minute. During that minute, the originate modem tries to establish the leased line link. If the leased line is established during that time, the S17 timer is cleared and everything is back to normal. If the timer expires, the modem attempts a dial backup connection. The purpose of the timer for the answer modem is to deter­mine when it can accept a dial-up call. Dial-back starts only when both timers have expired and the leased line is still down.
The restore timer, register S15, determines how frequently restoral attempts occur when the modems are in dial backup mode. S15 can be set from 10 to 255 minutes in one minute increments. A value of 0 disables dial backup. The default value is 30 minutes.
7 Leased Line Operation
Note: Register S15 must be set identically on the local and remote modems.
The dial backup number must be set from the front panel of the modem.

Dial Backup and Leased Line Restoral Setup

1. Connect a modular telephone cable to the LINE jack of an MT5600BL modem set up for four-wire leased line operation. Connect the other end of the cable to a standard dialup line jack.
2. Turn on the modem.
3. Starting at the STATUS screen, press the following buttons on the front panel: â, â, à, â, à, à, à. The ENTER NUMBER screen appears.
4. Press the áß or â button several times to select the first digit in the dial backup telephone number.
5. Press the à button to go to the next digit in the number.
Note: To backspace or to cancel an entry, press à several times.
6. The number can be up to 30 characters in length. Repeat steps 4 and 5 until the number is entered, and then press the Enter button to store it. The DIAL BACK- UP # STORED screen appears.
7. Press the Enter button again to go to the DIAL BACKUP NUMBER screen.
Note: Steps 8 through 15 are optional.
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8. To change the default restore time, press â to go to the TIME TO RESTORE (S15) screen, then press à, à. The ENTER TIME IN MINUTES screen appears.
9. Press the áß or â button several times to select the first digit in the number.
10. Press the à button to go to the next digit in the number.
11. Repeat steps 9 and 10 until you have entered a value between 10 and 255, or 0 to disable dial backup, and then press the Enter button to store it. The TIME STORED screen appears.
12. Press the Enter button to return to the TIME TO RESTORE (S15) screen.
13. To change the default dial backup time, press â to go to the DIAL BACKUP TIME (S17) screen, then press à, à. The ENTER TIME IN MINUTES screen appears.
14. Repeat steps 9 and 10 until you have entered a value between 0 and 255, and then press the Enter button to store it. The TIME STORED screen appears.
15. Press the Enter button again to return to the DIAL BACKUP TIME (S17) screen.
16 . Dial backup and leased line restoral setup is complete.
Note: Registers S15 and S17 can also be changed using the Sr=n AT command. See Chapter 4.
7 Leased Line Operation
Note: The dial backup number can be displayed only 16 characters at a time. To see characters 17–30, press the â button. To go to the previous screen, press the ß but­ton. To go to the next screen, press the à button.

Leased-Line Operating Distances

Wire gauge (AWG)
Data rate (bps) 19 22 24 28
2400 22.0 15.0 12.0 9.5 miles 4800 19.0 13.0 10.0 8.0 miles 9600 15.0 10.0 7.0 5.5 miles 19200 11.9 7.0 5.0 4.0 miles 56000 10.0 6.0 4.2 3.0 miles
Wire diameter (mm)
Data rate (bps) 0.90 0.65 0.50 0.32
2400 35.2 24.0 19.2 15.2 km 4800 30.4 20.8 16.0 12.8 km 9600 24.0 16.0 11.2 8.8 km 19200 19.0 11.2 8.0 6.4 km 56000 16.0 9.6 6.7 4.8 km
Distances depend upon data rate, wire gauge, impairments, cable type, manufacturer, msplices, bridge taps, etc. If you have any additional questions about distances, please contact your telephone company representative.
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8
Solving
Problems
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Introduction

Your modem was thoroughly tested at the factory before it was shipped. If you are unable to make a successful connection, or if you experience data loss or garbled characters during your connection, it is possible that the modem is defective. How­ever, it is more likely that the source of your problem lies elsewhere. The following symptoms are typical of problems you might encounter:
• None of the LEDs light when the modem is on.
• The modem does not respond to commands.
• The modem cannot connect when dialing.
• The modem disconnects while online.
• The modem cannot connect when answering.
• File transfer is slower than it should be.
• Data is being lost.
• There are garbage characters on the monitor.
• The modem doesn’t work with Caller ID.
• Fax and data software can’t run at the same time.
8 Solving Problems
If you experience problems, please check the following possibilities before calling Technical Support (see Appendix D).

None of the Indicators Light

When you turn on the modem, the LED indicators on the front panel should flash briefly as the modem runs a self-test, and the liquid crystal display (LCD) should light. If the LEDs and LCD remain off, the modem is probably not receiving power.
4
Make sure the modem’s power switch is on, especially if you normally turn the modem on by turning on a power strip.
4
If the modem is plugged into a power strip, make sure the power strip is plugged in and its power switch is on.
4
Make sure the transformer module is firmly connected to the modem and to the wall outlet or power strip.
4
If the power strip is on and the modem switch is on, try moving the transformer module to another outlet on the power strip.
4
Test that the outlet is live by plugging another device, such as a lamp, into it.
4
The modem or transformer module may be defective. If you have another Multi­Tech modem, try swapping modems. If the problem goes away, the first modem or transformer module may be defective. Call Technical Support for assistance.
CAUTION: Do not under any circumstances replace the transformer module with one designed for another product; doing so can damage the modem and void your warranty.
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8 Solving Problems

The Modem Does Not Respond to Commands

4
Make sure the modem is plugged in and turned on. (See “None of the Indicators Light.”)
4
Make sure you are issuing the modem commands from data communication software, either manually in terminal mode or automatically by configuring the software. (You cannot send commands to the modem from the DOS prompt.)
4
Make sure you are in terminal mode in your data communication program, then type AT and press ENTER. If you get an OK response from your modem, your connections are good and the problem likely is in the connection setup in your communication software.
4
Try resetting your modem by turning it off and on. If you are using DOS or Win­dows 3.1 communication software, make sure the initialization string includes &F as the first command, to cancel any “leftover’ command that could affect the modem’s operation.
4
If you don’t get an OK, the problem may still be in the communication software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communication programs connect to the COM port automati­cally. Some connect when the software loads and remain connected until the program terminates. Others can disconnect without exiting the program. The modem’s TR indicator lights to show that the software has taken control of the modem through the COM port.
4
Your communication software settings may not match the physical port the mo­dem is connected to. The serial cable might be plugged into the wrong connector—check your computer documentation to make sure. Or you might have selected a COM port in your software other than the one the modem is physically connected to—compare the settings in your software to the physical connection.
4
If the modem is on, the cable is plugged into the correct port, the communication software is configured correctly, and you still don’t get an OK, the fault might be in the serial cable. Make sure it is firmly connected at both ends.
4
Is this the first time you have used the cable? If so, it may not be wired correctly. Check the cable description on the packaging to make sure the cable is the right one for your computer.
4
Peripheral expansion cards, such as sound and game cards, might include a seri­al port preconfigured as COM1 or COM2. The extra serial port, or the card itself, may use the same COM port, memory address, or interrupt request (IRQ) as your communication port. Be sure to disable any unused ports.
Windows 3.1x: To look for address or IRQ conflicts, in Program Manager select File | Run, type MSD, and press ENTER. Then select Mouse, COM Ports, and IRQ Status, and note the addresses and IRQs that are in use. If you find an IRQ
conflict, note which IRQs are not being used, then change one of the conflicting devices to use one of the unused IRQs. If you find an address conflict, change the address of one of the conflicting devices.
To change a port address or IRQ in Windows 3.1x, double-click the Control Panel icon, then the Ports icon. Click on the port you want to change, click Settings,
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click Advanced, and select the new port address and/or interrupt. If you wish to use COM3 or COM4, note that COM3 shares an IRQ with COM1, as does COM4 with COM2, so you should change their IRQs to unused ones, if possible.
Windows 9x: Right-click on My Computer, select Properties from the menu, click on the Device Manager tab, double-click on Ports, then double-click on the communication port your modem is connected to. In the port’s Properties sheet, click on the Resources tab to see the port’s input/output range and interrupt re­quest. If another device is using the same address range or IRQ, it appears in the Conflicting Device List. Uncheck Use automatic settings to change the port’s settings so they do not conflict with the other device, or select the port the con­flicting device is on and change it instead. If you need to open your computer to change switches or jumpers on the conflicting device; refer to the device’s docu­mentation.
Windows NT 4.0: To look for address or IRQ conflicts, click Start, Programs, Ad­ministrative Tools (Common), and Windows NT Diagnostics. In the Windows NT Diagnostics dialog box, click the Resources tab to see which input/output ranges and interrupt requests are in use. If you need to open your computer to change switches or jumpers on the conflicting device; refer to the device’s docu­mentation.
8 Solving Problems
4
The serial port might be defective. If you have another serial port, install the mo­dem on it, change the COM port setting in your software, and try again.
4
The modem might have a problem beyond the scope of this user guide. If you have another Multi-Tech modem, try swapping modems. If the problem goes away, call Technical Support for assistance (see Appendix D).

The Modem Cannot Connect When Dialing

There can be several reasons the modem fails to make a connection. Possibilities include:
• lack of a physical connection to the telephone line.
• a wrong dial tone.
• a busy signal.
• a wrong number.
• no modem at the other end.
• a faulty modem, computer, or software at the other end.
• incompatibility between modems.
You can narrow the list of possibilities by using extended result codes. Extended re­sult codes are enabled by default. If they have been disabled, include V1X4 in the modem’s initialization string, or in terminal mode enter ATV1X4 and press ENTER. When you dial again, the modem reports the call’s progress.
4
If the modem reports NO DIALTONE, check that the modem’s telephone line ca­ble is connected to both the modem’s LINE jack (not the PHONE jack) and the telephone wall jack. If the cable looks secure, try replacing it. If that doesn’t work, the problem might be in your building’s telephone installation. To test the building installation, plug a telephone into your modem’s telephone wall jack and listen for a dial tone. If you hear a dial tone, your modem might be installed
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behind a corporate phone system (PBX) with an internal dial tone that sounds different from the normal dial tone. In that case, the modem might not recognize the dial tone and might treat it as an error. Check your PBX manual to see if you can change the internal dial tone; if you can’t, change your modem’s initializa­tion string to replace X4 with X3, which will cause the modem to ignore dial tones (note, however, that X3 is not allowed in some countries, such as France and Spain).
4
If the modem reports BUSY, the other number might be busy, in which case you should try again later, or it might indicate that you have failed to add a 9, prefix to the phone number if you must dial 9 for an outside line.
If you must dial 9 to get an outside line, the easiest way to dial it automatically is to include it in the modem’s dial prefix, e.g., ATDT9,. Note the comma, which inserts a pause before the number is dialed. By inserting 9, into the dial prefix, you do not have to include it in each directory entry.
To change the dial prefix in Windows 95 HyperTerminal, select Connect from the Call menu, click Dialing Properties, and type 9 in the local and long distance boxes in How I dial from this location.
4
If the modem reports NO ANSWER, the other system has failed to go off-hook, or you might have dialed a wrong number. Check the number.
8 Solving Problems
4
If the modem reports NO CARRIER, the phone was answered at the other end, but no connection was made. You might have dialed a wrong number, and a per­son answered instead of a computer, or you might have dialed the correct number but the other computer or software was turned off or faulty. Check the number and try again, or try calling another system to make sure your modem is working. Also, try calling the number on your telephone. If you hear harsh sounds, then another modem is answering the call, and the modems might be having problems negotiating because of modem incompatibilities or line noise. Try connecting at a lower speed.

The Modem Disconnects While Online

4
If you have Call Waiting on the same phone line as your modem, it can interrupt your connection when someone tries to call you. If you have Call Waiting, dis­able it before each call. In most telephone areas in North America, you can disable Call Waiting by preceding the telephone number with *70 (check with your local telephone company).
You can automatically disable Call Waiting by including the disabling code in the modem’s dial prefix (e.g., ATDT*70,—note the comma, which inserts a pause before the number is dialed). To change the dial prefix in Windows Terminal, se­lect Settings | Modem Commands. To change it in HyperTerminal, select
Connect from the Call menu, click Dialing Properties, check This location has Call Waiting, and select the correct code for your phone service.
4
If you have extension phones on the same line as your modem, you or someone else can interrupt the connection by picking up another phone. If this is a fre­quent problem, disconnect the extension phones before using the modem, or install another phone line especially for the modem.
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4
Check for loose connections between the modem and the computer, the tele­phone jack, and AC power.
4
You might have had a poor connection because of line conditions or the problem might have originated on the other end of the line. Try again.
4
If you were online with a BBS or an online service like CompuServe, it might have hung up on you because of lack of activity on your part or because you ex­ceeded your time limit for the day. Try again.
8 Solving Problems

The Modem Cannot Connect When Answering

4
The default DTR Control command (&D2) inhibits autoanswer. To enable au­toanswer, change DTR Control to &D0, and make sure &Q0, &Q1, &Q5, or &Q6 is also set. For more information, see the &D command in Chapter 4. For infor­mation on changing the modem’s default configuration, see “Step 3: Install and Configure Your Software” in Chapter 2.
4
Autoanswer might be disabled. Turn on autoanswer in your datacomm program or send the command ATS0=1 (ATS0=2 if you have Caller ID service) to your modem in terminal mode.

File Transfer Is Slower Than It Should Be

4
You might have an older UART. For best throughput, install a 16550AFN UART or a Multi-Tech ISI serial port card. See the “Quick Start” chapter for information on how to identify your UART.
4
If you are running under Windows 3.1 and have a 16550AFN UART, you must replace the Windows serial driver, COMM.DRV, to take full advantage of the UART’s speed.
4
If you are using a slow transfer protocol, such as Xmodem, try Zmodem or Ymodem/G instead.
4
Is your line noisy? If there is static on your line, the modem has to resend many blocks of data to insure accuracy. You must have a clean line for maximum speed.
4
Are you downloading a compressed file with MNP 5 hardware compression en­abled? Since hardware data compression cannot compress a file already compressed by an archiving program, the transfer can be marginally slower with data com­pression enabled than with it disabled.
4
Does your Internet service provider (ISP) use the same 56K protocol as your mo­dem? The default setting of your modem is to connect using either the K56flex or the V.90 protocol, depending on which one the ISP modem is using. If your ISP uses the X2 protocol, the maximum speed you will be able to connect at is 33,600 bps. Check with your ISP to see which protocols it supports, and check the Multi­Tech Web site for the latest developments in V.90.
4
Try entering the &V1 command to display information about the last connection, making a screen print of the connection statistics, and checking for parameters that might be unacceptable.
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Data Is Being Lost

4
If you are using data compression and a high speed serial port, set the serial port baud rate to four times the data rate.
4
Your UART might not be reliable at serial port speeds over 9600 bps or 19,200 bps. Turn off data compression, reset your serial port speed to a lower rate, or replace your serial port with a faster one.
4
Make sure the flow control method you selected in software matches the method selected in the modem. If you are using the modem with a Macintosh, you might have the wrong cable for hardware flow control.
4
If you are running under Windows 3.1 and have a 16550AFN UART, you might need to turn on the 16550’s data buffers and/or replace the Windows serial driv­er, COMM.DRV.
4
Try entering the &V1 command to display information about the last connection, making a screen print of the connection statistics, and checking for parameters that might be unacceptable.
8 Solving Problems

There Are Garbage Characters on the Monitor

4
Your computer and the remote computer might be set to different word lengths, stop bits, or parities. If you have connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communication software.
4
You might be experiencing line noise. Enable error correction, if it is disabled, or hang up and call again; you might get a better connection the second time.
4
At speeds above 2400 bps, the remote modem might not use the same transmis­sion or error correction standards as your modem. Try connecting at a slower speed or disabling error correction. (With no error correction, however, line noise can cause garbage characters.)
4
Try entering the &V1 command to display information about the last connection, making a screen print of the connection statistics, and checking for parameters that might be unacceptable.
The Modem Doesn’t Work with Caller ID
4
Caller ID information is transmitted between the first and second rings, so if autoanswer is turned off (S0=0) or if the modem is set to answer after only one ring (S0=1), the modem will not receive Caller ID information. Check your ini­tialization string, and if necessary change it to set the modem to answer after the second ring (S0=2).
4
Make sure that you have Caller ID service from your telephone company.
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8 Solving Problems
Fax and Data Software Can’t Run at the Same Time
4
Communication devices can be accessed by only one application at a time. Under DOS or Windows 3.1x, you can run either your fax software or your datacomm software, but not both at the same time, unless you have a special communication device management application. In Windows 95, 98, and NT 4.0, you can have data and fax communication applications open at the same time, but they cannot use the same modem at the same time.
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Appendixes
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A Regulatory Compliance

Appendix A: Regulatory Compliance

FCC Part 68 Telecom

1. This equipment complies with part 68 of the Federal Communications Commis­sion Rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number. This information must be provided to the telephone company.
2. The suitable USOC jack (Universal Service Order Code connecting arrangement) for this equipment is shown below. If applicable, the facility interface codes (FIC) and service order codes (SOC) are shown.
3. An FCC-compliant telephone cord and modular plug is provided with this equipment. This equipment is designed to be connected to the telephone net­work or premises wiring using a compatible modular jack that is Part 68 compli­ant. See installation instructions for details.
4. The ringer equivalence number (REN) is used to determine the number of devic­es that may be connected to the telephone line. Excessive RENs on the telephone line may result in the device not ringing in response to an incoming call. In most, but not all, areas the sum of the RENs should not exceed 5.0. To be certain of the nuber of devices that may be connected to the line, as determined by the total RENs, contact the local telephone company.
5. If this equipment causes harm to the telephone network, the telephone company will notify you in advance that temporary discontinuance of service may be re­quired. But if advance notice is not practical, the telephone company will notify you as soon as possible. Also, you will be advised of your right to file a com­plaint with the FCC if you believe it is necessary.
6. The telephone company may make changes in its facilities, equipment, opera­tions, or procedures that could affect the operation of the equipment. If this hap­pens, the telephone company will provide advance notice in order for you to make necessary modifications in order to maintain uninterrupted service.
7. If trouble is experienced with this equipment (the model of which is indicated below) please contact Multi-Tech Systems, Inc. at the address shown below for details of how to have repairs made. If the trouble is causing harm to the tele­phone network, the telephone company may request you remove the equipment from the network until the problem is resolved.
8. 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.
9. This equipment should not be used on party lines or coin lines.
10. If so required, this equipment is hearing-aid compatible.
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Manufacturer: Multi-Tech Systems, Inc. Trade Name MultiModemII Model Number: MT5600BA or MT5600BL FCC Registration No: AU7USA-33378-M5-E Ringer Equivalence No: 0.1A Modular Jack (USOC): RJ11C or RJ11W (single line)
Service Center in USA: Multi-Tech Systems, Inc.

Fax Branding Statement

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 the following information:
A Regulatory Compliance
2205 Woodale Drive Mounds View, MN 55112 U.S.A. (763) 785-3500 (763) 785-9874 Fax
• Date and time the message is sent
• Identification of the business or other entity, or other individual sending the
message
• Telephone number of the sending machine or such business, other entity, or individual
This information is to appear in a margin at the top or bottom of each transmitted page or on the first page of the transmission. (Adding this information in the margin is referred to as fax branding.)
Since any number of fax software packages can be used with this product, the user must refer to the fax software manual for setup details. Typically the fax branding information must be entered via the configuration menu of the software.
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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 on an 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. The Industry Canada label 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.
A Regulatory Compliance
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.

EMC, Safety, and R&TTE Directive Compliance

The CE mark is affixed to this product to confirm compliance with the following European Community Directives:
• Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member States relating to electromagnetic compatibility;
and
• Council Directive 73/23/EEC of 19 February 1973 on the harmonization of the laws of Member States relating to electrical equipment designed for use within certain voltage limits;
and
• Council Directive 1999/5/EC of 9 March 1999 on radio equipment and telecom­munications terminal equipment and the mutual recognition of their conformity.
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International Modem Restrictions

Some dialing and answering defaults and restrictions may vary for international modems. Changing settings may cause a modem to become non-compliant with national telecom requirements in specific countries. Also note that some software packages may have features or lack restrictions that may cause the modem to be­come non-compliant.

New Zealand Telecom Warning Notice

1. The grant of a Telepermit for any item of terminal equipment indicates only that Telecom has accepted that the item complies with minimum conditions for con­nection to its network. It indicates no endorsement of the product by Telecom, nor does it provide any sort of warranty. Above all, it provides no assurance that any item will work correctly in all respects with another item of Telepermit­ted equipment of a different make or model, nor does it imply that any product is compatible with all of Telecom’s network services.
This equipment is not capable under all operating conditions of correct opera­tion at the higher speed which it is designated. 33.6 kbps and 56 kbps connec­tions are likely to be restricted to lower bit rates when connected to some PSTN implementations. Telecom will accept no responsibility should difficulties arise in such circumstances.
A Regulatory Compliance
2. Immediately disconnect this equipment should it become physically damaged, and arrange for its disposal or repair.
3. This modem shall not be used in any manner which could constitute a nuisance to other Telecom customers.
4. This device is equipped with pulse dialing, while the Telecom standard is DTMF tone dialing. There is no guarantee that Telecom lines will always continue to support pulse dialing.
Use of pulse dialing, when this equipment is connected to the same line as other equipment, may give rise to ‘bell tinkle’ or noise and may also cause a false an­swer condition. Should such problems occur, the user should not contact the Telecom Faults Service.
The preferred method of dialing is to use DTMF tones, as this is faster than pulse (decadic) dialing and is readily available on almost all New Zealand tele­phone exchanges.
5. Warning Notice: No ‘111’ or other calls can be made from this device during a mains power failure.
6. This equipment may not provide for the effective hand-over of a call to another device connected to the same line.
7. Some parameters required for compliance with Telecom’s Telepermit require­ments are dependent on the equipment (PC) associated with this device. The as­sociated equipment shall be set to operate within the following limits for compliance with Telecom’s Specifications:
For repeat calls to the same number:
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• There shall be no more than 10 call attempts to the same number within any 30-minute period for any single manual call initiation, and
• The equipment shall go on-hook for a period of not less than 30 seconds be­tween the end of one attempt and the beginning of the next attempt.
For automatic calls to different numbers:
• The equipment shall be set to ensure that automatic calls to different num­bers are spaced such that there is no less than 5 seconds between the end of one call attempt and the beginning of another.
For automatically answered incoming calls:
• The equipment shall be set to ensure that calls are answered between 3 and 30 seconds of receipt of ringing.
8. For correct operation, total of the RNs of all devices connected to a single line at any time should not exceed 5.

South African Notice

A Regulatory Compliance
This modem must be used in conjunction with an approved surge protection device.
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B Technical Specifications

Appendix B: Technical Specifications

Your MultiModemII modem meets the following specifications:
Trade Name MultiModemII™
Model Number MT5600BA and MT5600BL
Server-to-Client K56flex or V.90 speeds when accessing a K56flex or V.90 Data Rates server (actual speed depends on server capabilities and line
conditions)*
Client-to-Client 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, Data Rates 14400, 12000, 9600, 7200, 4800, 2400, 1200, 0-300 bps
Fax Data Rates 14400, 12000, 9600, 7200, 4800, 2400, 300 bps
Data Format Serial, binary, synchronous and asynchronous
Commands AT, V.25bis, TIA/EIA TR.29 Class 2
Command Buffer 40 characters
Modem Compatibility ITU-T V.90; K56flex; ITU-T V.34 enhanced, V.34, V.32terbo,
V.32bis, V.32, V.25bis, V.22bis, V.22; Bell 212A and 103/113; ITU-T V.42, V.42bis; ITU-T V.21 & V.23 in international versions
Fax Compatibility ITU-T Group 3, Class 1 and 2, T.4, T.30, V.21, V.27ter, V.29,
V.17, and TIA/EIA TR29.2
Error Correction ITU-T V.42 (LAP-M or MNP 3 and 4)
Data Compression ITU-T V.42bis (4:1 throughput), MNP 5 (2:1 throughput)
Speed Conversion Serial port data rates adjustable to 300, 1200, 2400, 4800,
9600, 19200, 38400, 57600, 115200, and 230400 bps
Mode of Operation Fax online modes; full duplex over dial-up and two-wire
leased lines; data mode, command mode, online command mode, V.54 test mode
Flow Control XON/XOFF (software), RTS/CTS (hardware)
Intelligent Features Plug and Play; AT command compatible; autodial, redial,
repeat dial; pulse or tone dial; dial pauses; auto answer; Caller ID; remote configuration; adaptive line probing; auto­matic symbol and carrier frequency during start-up, retrain, and rate renegotiation; DTMF detection; call status display, auto-parity and data rate selection; keyboard- and front panel-controlled modem options; monitor and LCD dis­plays for modem options; non-volatile memory; storage of up to four command strings or telephone numbers of up to 40 characters each
*Though these modems are capable of 56K bps download performance, line impairments,
public telephone infrastructure and other external technological factors currently prevent maximum 56K bps connections.
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Transmission Level -11 dBm (dial-up—varies depending on country setting), -10
Frequency Stability ±0.01%
Receiver Sensitivity -43 dBm under worst-case conditions
AGC Dynamic Range 43 dB
Interface TIA/EIA RS-232C/ITU-T V.24/V.28
Connectors DB25F RS-232C connector; two RJ-11 phone jacks (BA mod-
Cables One (MT5600BA) or three (MT5600BL) modular telephone
Diagnostics Power-on self test, local analog loop, local digital loop,
B Technical Specifications
dBm (leased-line)
el) or three RJ-11 phone jacks (BL model); power connector
cords (USA); country-specific cordage for International mod­els; one 9-pin to 25-pin serial cable for International models; external power transformer
Note: Any cables connected to the computer should be shielded to reduce interference.
remote digital loop
Indicators 32-character backlit LCD for status and configuration infor-
mation; LEDs for Transmit Data, Receive Data, Carrier Detect, Off Hook, Terminal Ready, and Test Mode
Speaker 1-inch speaker for call progress monitoring
Manual Controls Power switch, speaker volume control, four LCD control
buttons
Environmental Temperature range 0°–50°C (32°–120°F) ambient under
closed conditions; humidity range 20–90% (non-condensing)
Storage Temperature -10° to +85°C (14°–185°F)
Power Requirement 120 VAC, 60 Hz, 16 W; 230V/50 Hz optional (international)
Power Consumption 12 W @ 0.1 A typical
Dimensions 15.8 cm wide × 22.9 cm long × 3.6 cm high (6.2" × 9.0" × 1.4")
Weight 0.9 kg (2 lb.)
Limited Warranty 10 years
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m

Appendix C: Loopback Tests

Introduction

Each time you turn on your modem, it performs an automatic self-test to ensure proper operation. Your modem also has three diagnostic tests: local analog loop­back, remote digital loopback, and local digital loopback. These ITU-T V.54 loop­back tests isolate telephone circuit and transmission problems.
In a loopback test, data from your computer loops through the circuits of your mo­dem and/or a remote modem before it appears on your monitor. When the loop has been completed, the data on your PC’s monitor should match the original data.
The local analog loopback test allows you to verify that the modem’s transmitter and receiver circuits are functioning properly.
The remote digital loopback test allows you to verify that the local computer or ter- minal, the serial ports, the local and remote modems, and the transmission line be­tween them are functioning properly.
The local digital loopback test allows you to verify that the remote computer or ter­minal, the serial ports, the local and remote modems, and the transmission line be­tween them are functioning properly.
C Loopback Tests
Note: All loopback tests should be run at 9600 bps without error correction.

Local Analog Loopback Test (V.54 Loop 3)

In this test, data from your computer or terminal is sent to your modem’s transmit­ter, converted into analog form, looped back to the modem’s receiver, converted into digital form, and then sent to your monitor for verification. No connection to the phone line is required.
AT&T1 CONNECT 9600 UUUUUUUUUUU UUU
Digital Analog
Computer or Terminal
Figure C-1. Local analog loopback test.
Local MultiMode
Test procedure
1. Connect the modem to your computer. Using your communication program, set the desired baud rate and go into terminal mode.
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2. Type AT and press ENTER; you should get an OK message. Type AT\N and press ENTER to disable error correction.
3. Type AT&T1 and press ENTER. This places your modem in analog loopback mode in the originate mode. A CONNECT message should appear on your dis­play. The modem is now out of command mode and in a pseudo-online mode.
4. Note that the CD and TM indicators are on. If they are not on, there is a defect in your modem.
5. Enter characters from your keyboard. For this test, typing multiple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeros. The characters entered should be displayed on your monitor.
C Loopback Tests
6. To exit the test, type the escape sequence +++AT and press E modem in online command mode. Then type either AT&T or ATH to return to command mode.
7. Your modem passes this test if the data received on your monitor are the same as the data entered from your keyboard. If different data appear on your moni­tor, your modem is probably causing the problem, though it could also be your computer. If your modem passes this test, but you are receiving errors while on line, the remote modem or the phone line could be at fault.
Note: You can also start and stop an analog loopback test by using the front panel LCD and buttons. See “Diagnostic Options Trunk” in Chapter 3.

Remote Digital Loopback Test (V.54 Loop 2)

The remote digital loopback test tests the phone lines and the circuits of both your modem and a remote modem. In this test, your modem must be on line with another modem that is set up to respond to a request for remote digital loopback. (Note that some modems might not support remote digital loopback or might have it disabled.) Data from your computer or terminal is transmitted through your modem and over the phone line to the remote modem, where it is then looped back to your modem.
NTER. This puts the
Figure C-2. Remote digital loopback test.
Test procedure
AT&T6 CONNECT 9600 UUUUUUUUUUU UUUUU
Computer or Terminal
Digital Analog
Local MultiModem Remote MultiModem Computer or Terminal
DigitalAnalog
AT&T4 OK
1. Arrange to have &T4 set on the remote test modem. This command enables the remote modem to respond to an &T6 request for a remote digital loopback test from the local modem.
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2. Open your communications software and go into terminal mode. Type AT and press ENTER; you should get an OK message. Type AT\N and press ENTER to disable error correction. Type AT+MS=9,1,9600,9600 and press ENTER to set the local modem to V.32 mode at 9600 bps.
3. Dial the remote modem and establish your online connection.
C Loopback Tests
4. Type the escape sequence +++AT and press E
NTER to bring your modem into
online command mode.
5. Type AT&T6 and press ENTER. The local modem responds to this command by transmitting an unscrambled marking signal, which causes the remote modem to place itself in digital loopback mode. Then the local modem exits online com­mand mode and enters data mode.
6. Enter data from your keyboard. For this test, typing multiple uppercase U char­acters is a good way to send an alternating test pattern of binary ones and zeroes. Data received by the remote modem enters its analog receiver, is converted to digital data, is reconverted into analog, and then is transmitted back to your modem. Your modem passes this test if the data received on your monitor is the same as the data entered from your keyboard.
7. To exit the test, type the escape sequence +++AT and press E
NTER. This puts the
modem in online command mode. The modem should respond with an OK mes­sage. If you wish to stay on line with the remote modem for normal data trans­mission, type AT&T and press ENTER to exit the test, then type ATO and press ENTER to return on line. If you wish to terminate the call, type ATH and press ENTER to hang up.
Note: You can also start and stop a remote digital loopback test by using the front panel LCD and buttons. See “Diagnostic Options Trunk” in Chapter 3.

Local Digital Loopback Test (V.54 Loop 2)

The local digital loopback test is identical to the remote digital loopback test with one exception. Instead of using your modem to signal a remote modem to place it­self in digital loopback mode, your modem is placed in digital loopback mode while the remote modem is not. Data is entered and transmitted from the remote modem, sent across the phone line to your modem, and looped back to the remote modem.
AT&T3 OK
Digital Analog
Computer or Terminal
Local MultiModem Remote MultiModem Computer or Terminal
Figure C-3. Local digital loopback test.
DigitalAnalog
UUUUUUUUUUU UUU
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Test procedure
1. Open your communication software and go into terminal mode. Type AT and press ENTER; you should get an OK message. Type AT\N and press ENTER to dis­able error correction. Type AT+MS=9,1,9600,9600 and press ENTER to set the lo­cal modem to V.32 mode at 9600 bps.
2. Dial the remote modem and establish your online connection.
3. Type the escape sequence +++AT and press ENTER to bring your modem into online command mode.
4. Type AT&T3 and press ENTER. Once you receive an OK message from your mo­dem (if responses are enabled), your modem is placed in digital loopback mode.
5. Have someone enter data from the remote keyboard. For this test, typing multiple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeros. The data received by your modem enters its analog receiver, is converted to digital data, is reconverted into analog, and then is transmitted back to the remote modem. Your modem passes this test if the data received on the remote monitor is the same as the data entered from the remote keyboard.
6. To exit the test, turn off the modems.
C Loopback Tests
Note: You can also start and stop a local digital loopback test by using the front panel LCD and buttons. See “Diagnostic Options Trunk” in Chapter 3.

Back-to-Back Test

This test verifies proper operation by connecting two MT5600BLs back to back using an RJ-11 cable. By using an MT5600BL that is known to be good, you can test a second MT5600BL that is suspect.
UUUUUUUUUUU UUUUU
Computer or Terminal
Figure C-4. Back-to-back test.
Digital Analog
Local MultiModem
DigitalAnalog
JumperRJ-11 cable
MultiModem under test
1. Connect two MT5600BLs by plugging an RJ-11 cable into their LEASED jacks.
2. Set the terminal and modems to the same serial port speed. For instance, if you are using a terminal that is limited to 9600 bps, set the modems to 9600 bps by sending the command AT$SB9600&W0 to each modem.
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3. Following the instructions in Chapter 7, set both modems to two-wire leased­line mode. One should be set as the originate modem and the other as the an­swer modem, but it does not matter which is which.
4. Turn on both units and wait for carrier detect (CD).
5. On the modem under test, short pins 2 and 3 of the RS-232C connector with a paper clip or other metal device.
6. Enter data from your keyboard. Typing multiple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeroes. Data re­ceived by the remote modem enters its analog receiver, is converted to digital data, is reconverted into analog, and then is transmitted back to your modem. Your modem passes this test if the data received on your monitor is the same as the data entered from your keyboard.
7. To exit the test, turn off the modems.
C Loopback Tests
Jumper pins 2 and 3.
Modem under test
Local modem
LEASEDLINEPHONE
VOLUME
LEASEDLINEPHONE
VOLUME
EIA RS232C
EIA RS232C
Figure C-5. Back-to-back test connections.
POWER
POWER
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D Warranty, Service, and Technical Support

Appendix D: Warranty, Service, and Technical Support

Limited Warranty

Multi-Tech Systems, Inc. (MTS) warrants that this product will be free from defects in material or workmanship for a period of five years from the date of purchase or, if date of purchase is not provided, five years from the date of shipment, unless other­wise limited or prohibited by law.
MTS MAKES NO OTHER WARRANTY, EXPRESSED OR IMPLIED, AND ALL IM­PLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICU­LAR PURPOSE ARE HEREBY DISCLAIMED.
This warranty does not apply to any products that have been damaged by lightning storms, water, or power surges, or that have been neglected, altered, abused, used for a purpose other than the one for which they were manufactured, repaired by the customer or any party without MTS’s written authorization, or used in any manner inconsistent with MTS’s instructions.
MTS’s entire obligation under this warranty shall be limited (at MTS’s option) to repair or replacement of any products that prove to be defective within the warranty peri­od, or, at MTS’s option, issuance of a refund of the purchase price. Defective prod­ucts must be returned by Customer to MTS’s factory with transportation prepaid.
MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES AND UNDER NO CIRCUMSTANCES WILL ITS LIABILITY EXCEED THE PURCHASE PRICE FOR DEFECTIVE PRODUCTS.

Online Warranty Registration

If you have access to the World Wide Web, you can register your Multi-Tech prod­uct online at the following URL:
http://www.multitech.com/register/

Service

North American Products

In the event that service is required, products may be shipped, freight prepaid, to our Mounds View, Minnesota, factory. Please send modems that require repairs to the following address:
Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112
Attn: Repairs, Serial #______
A Returned Materials Authorization (RMA) is not required. Return shipping charg­es (surface) will be paid by MTS. Please include inside the shipping box a description
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of the problem, a return shipping address (must have street address, not P.O. Box), a telephone number, and if the product is out of warranty, a check or purchase order for repair charges.
Extended two-year overnight replacement agreements are available for selected products. Please refer to our Overnight Replacement Agreement at http://
www.multitech.com/PROGRAMS/orc/ for details on rates and coverages. Please direct
your questions regarding technical matters, product configuration, verification that the product is defective, etc., to our Technical Support department at 800 972-2439.
Please direct your questions regarding repair expediting, receiving, shipping, bill­ing, etc., to our Repair Accounting department at 800 328-9717 or 763 785-3500.
Repairs for damages caused by lightning storms, water, power surges, incorrect installa­tion, physical abuse, or user-caused damages are billed on a time-plus-materials basis.

International Products

Your distributor should contact Amex, Inc., for information about repairs for your Multi-Tech product:
D Warranty, Service, and Technical Support
Amex, Inc. 2724 Summer Street NE Minneapolis, MN 55413 U.S.A.
Please direct questions regarding technical matters, product configuration, verifica­tion that the product is defective, etc., to our Technical Support department nearest you, listed at http://www.multitech.com/COMPANY/offices/DEFAULT.ASP. When call­ing the U.S., please direct questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair Accounting department at +763 785-3500.
Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse, or user-caused damages are billed on a time-plus­materials basis.

Ordering Accessories

SupplyNet, Inc., can supply you with replacement power supplies, cables and con­nectors for select Multi-Tech products. You can place an order with SupplyNet via mail, phone, fax or the Internet at the following addresses:
Mail: SupplyNet, Inc.
614 Corporate Way Valley Cottage, NY 10989
Phone: 800 826-0279 Fax: 914 267-2420 Email: info@thesupplynet.com Internet: http://www.thesupplynet.com
Tel: +612 331-3251 Fax: +612 331-3180
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Technical Support

Multi-Tech Systems has an excellent staff of technical support personnel available to help you get the most out of your Multi-Tech product. If you have any questions about the operation of this unit, please call 800 972-2439 (USA and Canada) or 763 785-3500 (international and local). Please have modem information available. You can also contact Technical Support by e-mail at the following addresses:
U.S., Canada & Europe: support@multitech.com
France: support@multitech.fr
India: support@multitechindia.com
U.K.: support@multitech.co.uk

Internet Sites

Multi-Tech is a commercial provider on the Internet. Multi-Tech has a Web site at
http://www.multitech.com
and an ftp site at
D Warranty, Service, and Technical Support
ftp://ftp.multitech.com
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