® Part No.
3Com Corporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 95052-8145 © 3Com Europe Ltd, 1996. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without permission from 3Com Europe Ltd. 3Com Europe Ltd.
IMPORTANT SAFETY INFORMATION WARNING: Warnings contain directions that you must follow for your personal safety. Follow all instructions carefully. Please read carefully and thoroughly the following information before installing the AccessBuilder 7000 Triple Modem Module: ■ Exceptional care must be taken during installation and removal of the module.
WICHTIGE SICHERHEITSHINWEISE ACHTUNG: Die Warnungen enthalten Anweisungen, die Sie zur eigenen Sicherheit zu befolgen haben. Lesen Sie bitte die folgenden Informationen sorgfältig durch, bevor Sie den AccessBuilder 7000 Triple Modem Module einbauen: ■ Auf besondere Vorsicht muß während des Ein- und Ausbaus des Einheits geachtet werden.
L’INFORMATION DE SÉCURITÉ IMPORTANTE AVERTISSEMENT: Les avertissements contiennent les instructions que vous devez suivre pour votre sécurité personnelle. Suivre toutes les instructions avec soin. Veuillez lire à fond l’information suivante avant d’installer le moyeu: ■ Le soin exceptionnel doit être pris pendant l’installation et l’enlèvement du moyeu.
CONTENTS IMPORTANT SAFETY INFORMATION WICHTIGE SICHERHEITSHINWEISE L’INFORMATION DE SÉCURITÉ IMPORTANTE ABOUT THIS GUIDE Introduction 1 How to Use This Guide 1 Conventions 2 Additional Safety Information 3 1 TRIPLE MODEM MODULE Introduction 1-1 Principal Features 1-2 Implementation of V.
3 TROUBLESHOOTING Troubleshooting Guide 3-1 Modem Health 3-1 Modem - DTE Connection 3-2 Modem - Telephone Line Connection 3-3 Connection Problems in Answering a Call 3-3 Connection Problems When Originating a Call 3-4 On-line Operation 3-6 Private-line Operation 3-6 Dial Backup Operation 3-6 A MODEM SPECIFICATION AND INTERFACE PIN ASSIGNMENTS Transmitter / Receiver Specifications A-1 Autodial - Autoanswer A-2 Physical Description A-3 Approvals Information A-4 General Approvals Requirements A-4 Interference
B TECHNICAL SUPPORT On-line Technical Services D-1 3Com Bulletin Board Service D-1 Access by Modem D-1 Access by ISDN D-2 World Wide Web Site D-2 Support from Your Network Supplier D-3 Support from 3Com D-4 Returning Products for Repair D-5 INDEX LIMITED WARRANTY FCC CLASS A VERIFICATION STATEMENT
ABOUT THIS GUIDE Introduction This guide describes the features, installation and configuration of the AccessBuilder 7000 Triple Modem Module. This guide assumes that you have installed your AccessBuilder 7000 Access Concentrator and that the phone lines to which you want to connect the modems are installed and operational. How to Use This Guide This table shows where to find specific information: If you are looking for information on: Turn to: The Triple Modem Module’s features and typical uses.
2 ABOUT THIS GUIDE Conventions The icon conventions that are used throughout this guide are: Icon Type Description Information Note Information notes call attention to important features or instructions. Caution Cautions alert you to personal safety risk, system damage, or loss of data. Warning Warnings alert you to the risk of severe personal injury. The text conventions used in this guide are: Convention Description “Enter” vs.
Additional Safety Information 3 Additional Safety Information See also the Important Safety Information at the front of this guide. When using the unit, observe the following safety information: ■ Retain this user’s guide for later use and pass it on in the event of change of ownership of the unit. ■ Products manufactured by us are safe and without risk provided they are installed, used and maintained in good working order in accordance with our instructions and recommendations.
4 ABOUT THIS GUIDE
1 TRIPLE MODEM MODULE Introduction This chapter outlines the features and uses of the AccessBuilder 7000 Triple Modem Module when installed in the AccessBuilder 7000 Access Concentrator chassis. The Triple Modem Module houses three modems on a single device module that operate independently of each other but are identical in the features and facilities they offer.
1- 2 CHAPTER 1: TRIPLE MODEM MODULE Principal Features ■ Support for dial-up transmission protocols: ■ ■ ■ ■ ■ V.34 – 2-wire full duplex modems operating at data signalling rates of 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800 and 2400 bps. Non-proprietary V.32 terbo – 2-wire full duplex modems operating at data signalling rates of 19200, 16800, 14400, 12000, 9600, 7200 and 4800 bps. V.
Introduction 1-3 ■ Asynchronous dial DTE data rates from 300 to 115200 bps. ■ Modem configuration changes using the DTE interface or throught the Management Controller Module. ■ Compatibility with the industry standard AT command set. ■ Storage of up to 20 telephone numbers in directory locations. ■ Dialling using AT commands, CCITT V.25bis commands or by raising DTR on the Host to modem interface, or by data being sent to the DTE interface.
1- 4 CHAPTER 1: TRIPLE MODEM MODULE negotiated between modems, providing a 16.7% increase in speed over that which can be negotiated using V.32bis. If the modem you are calling is unable to operate at the same high speeds as your modem, an optimum data transfer rate is negotiated between the two using the default configuration settings. When using the higher line speeds made available by V.
Introduction 1-5 Typical Applications The Triple Modem module is ideally suited for large central sites providing access for remote users to central site services. In the example shown in Figure 1-1 a large number of remote users connect to the central site’s AccessBuilder 7000 and gain access to the corporate LAN and its facilities through a terminal server (such as the 3Com CS3000/3100 series).
1- 6 CHAPTER 1: TRIPLE MODEM MODULE Pack Contents Checklist Before you install your Triple Modem Module, check the contents of the box against the pack contents checklist below. If any of the items have been damaged in transit or are missing, then contact the 3Com reseller from whom the equipment was purchased. ■ 1 x Triple Modem Module front card. ■ 1 x Triple Modem Module back card. ■ 1 x AccessBuilder 7000 Triple Modem Module User Guide (This manual).
Pre-installation Requirements 1-7 Pre-installation Requirements Before you install the Triple Modem Module into the AccessBuilder 7000 Access Concentrator chassis, check that the following requirements have been met: ■ The AccessBuilder 7000 Access Concentrator must already be fitted with its power supply module(s) and the Management Controller Module if required.
1- 8 CHAPTER 1: TRIPLE MODEM MODULE
2 INSTALLATION AND OPERATION Overview This chapter describes how to install the AccessBuilder 7000 Triple Modem module into the AccessBuilder 7000 Access Concentrator chassis, how to connect to your DTEs and PSTN lines and how to read the LEDs on the module’s front panel. Ensure you read the safety information at the front of this guide before commencing installation of the AccessBuilder 7000 Triple Modem Module.
2- 2 CHAPTER 2: INSTALLATION AND OPERATION Installing The Module Before installing the module, read the Safety Information at the front of this guide. An AccessBuilder 7000 module consists of two parts; a front card and a back card that both connect to the chassis’ backplane. It is recommended that you install the module’s rear card into the chassis first. The installation of the Triple Modem Module into the AccessBuilder 7000 chassis takes place in three distinct operations: ■ Installing the front card.
Installing The Module 2-3 Installing the Rear Card Figure 2-1 Installing The Rear Card 1 Locate the rear slot equivalent to the front slot into which you will install the front card. 2 Remove the metal blanking plate at the rear of the chassis and retain the screws. Retain the blanking plate. If you remove the module, the blanking plate must be refitted to the chassis to aid the circulation of cooling air and to prevent dust and debris entering the unit.
2- 4 CHAPTER 2: INSTALLATION AND OPERATION Installing the Front Card Figure 2-2 Example of Installing A Front Card 1 Locate the front slot in the AccessBuilder 7000 chassis equivalent to the rear slot in which you have already installed the rear card. 2 Insert the front card into the slot ensuring that it is centered along the guide rails. 3 Use the module’s handles to push the card home into the chassis and lock it into place. 4 Close and lock the chassis door.
Installing The Module 2-5 Connecting the Cables The ports on the rear panel are arranged in two groups. Modem Lines 1-3 Each modem port has two connections: 1 2 3 4 5 6 7 8 Dial Line (1, 3 & 5) The upper RJ45 connection in each pair connects to a normal dialled service, use this port to connect your modem to the line. In some countries you may need to use an adapter to connect to your PSTN service provider’s socket.
2- 6 CHAPTER 2: INSTALLATION AND OPERATION Front Panel LEDs This section describes the Triple Modem Module’s LEDs. Most of the LEDs can only be seen when the front door of the AccessBuilder 7000 chassis is open. When the door is closed, only the PWR, ALARM, ALERT and TEST LEDs can be seen. These LEDs show the status of the whole module. The other status LEDs show information about one modem only. You can select the modem by toggling the push button at the foot of the module.
Front Panel LEDs 2-7 PWR (Power) When lit indicates that the module is receiving power from the chassis’ backplane and that the power circuits are functioning correctly. ALARM Lights to indicate that an event has occurred on one or more of the modems which has been configured to raise an alarm. See the AccessBuilder 7000 Access Concentrator User Guide for more information. ALERT Lights to indicate that an event has occurred on one or more of the modems which has been configured to raise an alert.
2- 8 CHAPTER 2: INSTALLATION AND OPERATION
3 TROUBLESHOOTING Troubleshooting Guide In this section we discuss the basic problems that can occur when using your modem. If you are having data communication difficulties such as periodic character loss, random errors, or constant format errors: use the loopback tests described in AccessBuilder 7000 AT Command Reference. With these tests you can usually isolate the fault in your system by using a process of elimination. If a problem continues to occur, contact your supplier for assistance.
3- 2 CHAPTER 3: TROUBLESHOOTING Modem - DTE Connection Modem does not accept or echo back AT commands Check that the cable between the serial port of the DTE and the modem is a standard RS232 cable. If the cable is bad, replace it. (Null modem cables, also known as cross-over cables, do not work in this application). A limited number of dumb terminals require DCD before they can talk to the modem. If this is the case you have to use a breakout box to raise DCD to the terminal.
Troubleshooting Guide 3-3 Modem - Telephone Line Connection Connection Problems in Answering a Call Modem does not receive a dial tone Attach a telephone direct to the wall outlet to check if a dial tone exists. Make sure the telephone line is connected to the appropriate modem’s rear panel PSTN jack. Modem does not go off-hook and answer an incoming call Check that the auto-answer ring count configuration option (S-Register 0) is set to a value other than 0.
3- 4 CHAPTER 3: TROUBLESHOOTING Connection Problems When Originating a Call Modem fails to go off-hook and originate a call Check that the modem’s configuration enables either AT dialling or V.25bis dialling. Note: A modem configured to accept AT commands cannot accept V.25bis commands, and vice versa. If using DTR dialling, check the telephone number stored in directory location 1, and check that the DTE is raising DTR from OFF to ON to initiate a dial. If using V.
Troubleshooting Guide 3-5 Intermittent disconnects, high error rates, or excessive retransmissions Perform a remote digital loop test as described in the AccessBuilder 7000 AT Command Reference. Modem establishes and disconnects a call You may have a poor telephone line connection. Disconnect and dial again. The remote modem may have encountered an error correction disconnect, where the modem is configured to establish a call using error correction.
3- 6 CHAPTER 3: TROUBLESHOOTING On-line Operation Data is scrambled Check that the character format (data bits, parity, and stop bits) is set to the same value in both modems. Missing data during a transfer Check that you are using the same method of flow control for both the modem and the DTE. If using XON/XOFF flow control, check that the modem’s parity matches the DTE’s parity. Private-line Operation Modems do not train-up on private lines Check that the correct cabling is used for your application.
A MODEM SPECIFICATION AND INTERFACE PIN ASSIGNMENTS Transmitter / Receiver Specifications Modulation CCITT V.34 (33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800, 2400 bps) Non-proprietary V.32terbo (19200, 16800, 14400, 12000, 9600, 7200, 4800 bps) CCITT V.32bis (14400, 12000, 9600, 7200, 4800 bps) CCITT V.32 (9600, 4800 bps) CCITT V.22bis (2400 bps) CCITT V.22 (1200 bps) CCITT V.
A-2 APPENDIX A: MODEM SPECIFICATION AND INTER FACE PIN ASSIGNMENTS Data Input Serial binary. Complies with CCITT V.28. Accepts levels ±3 volts to ±25 volts. (+)= space (-)= mark. Single wire ground return. 3000 to 7000 ohms load. Data Output Serial binary. Complies with CCITT V.28 ±12 volts nominal. Output impedance 300 ohms. Synchronization RTS/CTS delay dependent on modulation format. Equalizer Automatic adaptive equalizer. Error correction V.42 LAPM and MNP4. Data compression V.42bis and MNP5.
Physical Description A-3 Protocols Extended AT command set. Non-volatile memory. 5 preset factory, 2 user defined configurations and one power-up configuration. 20 stored telephone numbers. AT or V.25bis asynchronous, bisynchronous and HDLC synchronous commands are entered via the DTE interface. ASCII or EBCDIC character set used in V.25bis command mode. Autoanswer CCITT V.25 compliant. Busy Busy out via AT command or DTR.
A-4 APPENDIX A: MODEM SPECIFICATION AND INTER FACE PIN ASSIGNMENTS Approvals Information This product complies with the electro-magnetic compatibility (EMC) requirements of EN 55022 Class A and EN 50082 (susceptibility). The product carries the CE certification mark to indicate conformance with the following EU directives: ■ LVD (Low Voltage Directive (Safety) 73/23/EEC. ■ EMC (Electro Magnetic Compatibility) Directive 89/336/EEC. ■ TTE (Telecommunication Terminal Equipment) Directive 91/263/EEC.
Approvals Information ■ A-5 All the other apparatus shall comprise only: ■ ■ Apparatus approved (see note) for the purpose of connection between the apparatus and the digital circuit; and Cable or wiring complying with a code of practice for the installation of apparatus covered by this standard or such other requirements as may be applicable. Such apparatus may have been approved subject to limitations on its use.
A-6 APPENDIX A: MODEM SPECIFICATION AND INTER FACE PIN ASSIGNMENTS CAUTION: Danger of explosion if the battery is incorrectly replaced. Replace only with the same or equivalent type of battery as specified by the manufacturer. A used battery must be disposed of in accordance with the manufacturer’s instructions. PBX and PABX Application This unit has been approved for use of the following facilities. ■ Loop-disconnect and multi-frequency signalling.
Approvals Information A-7 Ringer Equivalence REN is a guide to the maximum number of apparatus (for example, telephones) that can be simultaneously connected to one telephone line. The REN value of each apparatus is added together and must not exceed 4. Unless otherwise marked, a telephone can be assumed to have a REN of 1.0. Each modem on this unit has a ringer equivalence number (REN) of 4.0.
A-8 APPENDIX A: MODEM SPECIFICATION AND INTER FACE PIN ASSIGNMENTS DTE Port Pin Assignments Each modem is equipped with a single serial port marked DTE, which can be used to enter asynchronous AT or V.25bis commands, and pass asynchronous or synchronous user data. This is a female 26-pin V.24 connector and can be used with X.21/V.11, v.24/V.28 or V.35/V.36 signalling. The cable pin-outs for each type of cable are shown below. X.21/V.11 The DTE port terminates with a 26-way miniature SCSI connector.
DTE Port Pin Assignments A-9 V.24/V.28 The DTE port terminates with a 26-way miniature SCSI connector. The port can be configured to support V.24 or V.28 signalling characteristics. The DTE port connecting cable is not supplied with the module. The following signalling characteristics should be observed when purchasing or fabricating a suitable cable.
A-10 APPENDIX A: MODEM SPECIFICATION AND INTER FACE PIN ASSIGNMENTS V.35/V.36 The DTE port terminates with a 26-way miniature SCSI connector. The port can be configured to support V.36 signalling characteristics. The DTE port connecting cable is not supplied with the module. The following signalling characteristics should be observed when purchasing or fabricating a suitable cable.
PSTN Port Cable Pin Assignments A-11 PSTN Port Cable Pin Assignments Each modem on the communications card is equipped with a single PSTN line port, which is accessed via the appropriate DIAL LINE socket on the card’s interface module (refer to the rear panel diagram in Section 1.2 for an exact reference of which socket services which modem on the communications card).
A-12 APPENDIX A: MODEM SPECIFICATION AND INTER FACE PIN ASSIGNMENTS Private Line Port Cable Pin Assignments Each modem on the communications card is equipped with a single Private line port supporting either a 2- or 4-wire connection, which is accessed via the appropriate PRIVATE LINE socket on the card’s interface module (refer to the rear panel diagram in Section 1.2 for an exact reference of which socket services which modem on the communications card).
B TECHNICAL SUPPORT 3Com provides easy access to technical support information through the variety of services described in this appendix. On-line Technical Services 3Com offers worldwide product support seven days a week, 24 hours a day, through the following on-line systems: ■ 3Com Bulletin Board Service (3ComBBS) ■ World Wide Web site 3Com Bulletin Board Service 3ComBBS contains patches, software, and drivers for all 3Com products, as well as technical articles.
B-2 APPENDIX B: TECHNICAL SUPPORT Call the telephone number nearest you: Country Data Rate Telephone Number Australia up to 14400 bps (61) (2) 9955 2073 France up to 14400 bps (33) (1) 69 86 69 54 Germany up to 9600 bps (49) (89) 627 32 188 or (49) (89) 627 32 189 Hong Kong up to 14400 bps (852) 2537 5608 Italy (fee required) up to 14400 bps (39) (2) 273 00680 Japan up to 14400 bps (81) (3) 3345 7266 Singapore up to 14400 bps (65) 534 5693 Taiwan up to 14400 bps (886) (2) 377 583
Support from Your Network Supplier B- 3 Support from Your Network Supplier If additional assistance is required, contact your network supplier. Many suppliers are authorized 3Com service partners who are qualified to provide a variety of services, including network planning, installation, hardware maintenance, application training, and support services.
B-4 APPENDIX B: TECHNICAL SUPPORT Support from 3Com If you are unable to receive support from your network supplier, technical support contracts are available from 3Com. In the U.S. and Canada, call (800) 876-3266 for customer service. If you are outside the U.S.
Returning Products for Repair B- 5 Returning Products for Repair A product sent directly to 3Com for repair must first be assigned a Return Materials Authorization (RMA) number. A product sent to 3Com without an RMA number will be returned to the sender unopened, at the sender’s expense. To obtain an RMA number, call or fax: Country Telephone Number Fax Number U.S. and Canada (800) 876 3266, option 2 (408) 764 7120 Europe 31 30 60 29900, option 5 (44) (1442) 275822 Outside Europe, U.S.
B-6 APPENDIX B: TECHNICAL SUPPORT
INDEX Numerics 3Com Bulletin Board Service (3ComBBS) D-1 3Com sales offices D-4 A ALARM LED 2-7 ALERT LED 2-7 ANS LED 2-6 B I installation 2-2 front card 2-4 prerequisites 1-7 rear card 2-3 L LED selection button 2-7 LEDs,front panel 2-6 LINE LED 2-6 bulletin board service D-1 N C cable pin-outs A-8 CH 1 LED 2-7 CH 2 LED 2-7 CH 3 LED 2-7 COMP LED 2-6 CONN LED 2-6 connecting cables 2-5 CORR LED 2-6 D DTE ports 2-5 F features 1-2 front card installation 2-4 network supplier support D-3 O on-line te
2 INDEX S SEND LED 2-7 T technical information A-1 technical support D-1 TERM LED 2-6 TEST LED 2-7 Triple Modem features 1-2 overview 1-1 typical applications 1-5 troubleshooting 3-1 typical applications 1-5 V V.
LIMITED WARRANTY HARDWARE: 3Com warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller: Internetworking products Network adapters Ethernet stackable hubs and unmanaged Ethernet fixed port repeaters One year Lifetime Lifetime* (One year if not registered) *Power supply and fans in these stackable hubs and unmanaged repeaters One year Other hardware prod
3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR OR MODIFY, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, OR OTHER HAZARD. LIMITATION OF LIABILITY.
FCC CLASS A VERIFICATION STATEMENT This equipment has been tested with a class A computing device and has been found to comply with part 15 of FCC Rules. Operation in a residential area may cause unacceptable interference to radio and TV receptions requiring the operator to take whatever steps are necessary to correct the interference.
