3Com 980/000048/001 - Manuals

1 - 2 C H A P T E R 1: T R I P L E M O D E M M O D U L E 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. ■ No...

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....

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 ...

1 - 6 C H A P T E R 1: T R I P L E M O D E M M O D U L E 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 ...

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 powe...

2 I N S T A L L A T I O N A N D O P E R A T I O N 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 l ines and how to read the LEDs on the module’s front panel. Ensur...

2 - 2 C H A P T E R 2: I N S T A L L A T I O N A N D O P E R A T I O N 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’ backpl...

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 y...

2 - 4 C H A P T E R 2: I N S T A L L A T I O N A N D O P E R A T I O N 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 c...

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: 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 ...

2 - 6 C H A P T E R 2: I N S T A L L A T I O N A N D O P E R A T I O N 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...

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 w hich has been configured to raise an alarm. S...

3 T R O U B L E S H O O T I N G 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 A...

3 - 2 C H A P T E R 3: T R O U B L E S H O O T I N G Modem - DTE Connection Modem does not accept or echo back AT commands Check t hat 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 c...

Troubleshooting Guide 3 - 3 Modem - Telephone Line Connection Connection Problems in Answering a Call Modem does not receive a dial tone Attach a t elephone direct to the wall outlet to check i f a dial tone exists. Make sure the telephone line is connected to the appropriate modem’s rear panel PSTN...

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...

3 - 6 C H A P T E R 3: T R O U B L E S H O O T I N G On-line Operation Data is scrambled Check t hat the character format (data bits, parity, and stop bits) is set to the same value in both modems. Missing data during a transfer Check t hat you are using the same method of flow control for both the ...

A M O D E M S P E C I F I C A T I O N A N D I N T E R F A C E P I N A S S I G N M E N T S 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, 120...

A - 2 A P P E N D I X A: M O D E M S P E C I F I C A T I O N A N D I N T E R F A C E P I N A S S I G N M E N T S D ata Input Serial binary. Complies with CCITT V.28. A ccepts levels ±3 volts to ±2 5 volts. (+)= space (-)= mark. Single wire ground return. 3000 to 7000 ohms load. Data Output Serial bi...

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. A...

A - 4 A P P E N D I X A: M O D E M S P E C I F I C A T I O N A N D I N T E R F A C E P I N A S S I G N M E N T S 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 certif...

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 o...

A - 6 A P P E N D I X A: M O D E M S P E C I F I C A T I O N A N D I N T E R F A C E P I N A S S I G N M E N T S 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 disp...

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 ...

A - 8 A P P E N D I X A: M O D E M S P E C I F I C A T I O N A N D I N T E R F A C E P I N A S S I G N M E N T S DTE Port Pin Assignments Each m odem 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...

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 ob...

P STN Port Cable Pin Assignments A - 11 P STN 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 ...

A - 12 A P P E N D I X A: M O D E M S P E C I F I C A T I O N A N D I N T E R F A C E P I N A S S I G N M E N T S P rivate 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 ...

B T E C H N I C A L S U P P O R T 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 B...

B - 2 A P P E N D I X B: T E C H N I C A L S U P P O R T Call the telephone number nearest you: Access by ISDN ISDN users can dial-in to 3ComBBS using a digital modem for fast access up to 56 Kbps. To access 3ComBBS using ISDN, dial the following number: (1) (408) 654-2703 World Wide Web Site Access...

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 ...

B - 4 A P P E N D I X B: T E C H N I C A L S U P P O R T 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. and Canada, c...

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 ...

I N D E X 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 bulletin board service D-1 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 featur...