3Com 980/000048/001 manual Troubleshooting Guide, Modem Health

Page 31

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.

Modem Health

POWER LED does not light

Make sure that the front and rear cards are pushed fully home, and that the rack enclosure is powered ON.

A problem is suspected after the power-up self-test

Initiate a local analogue loopback with a pattern test. If the modem consistently registers errors, contact your modem supplier.

If the modem passes these tests and you still have a problem, it is probably not with your modem.

Image 31

Contents Accessbuilder Triple Modem Module User Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Important Safety Information Wichtige Sicherheitshinweise ’INFORMATION DE Sécurité Importante Page Contents Modem Specification and Interface PIN Assignments Index Limited Warranty FCC Class a Verification Statement Page Introduction How to Use This GuideThis table shows where to find specific information About this GuideIcon conventions that are used throughout this guide are ConventionsText conventions used in this guide are Keep the unit away from radiators and heat sources Additional Safety InformationAbout this Guide Triple Modem Module Support for dial-up transmission protocols Principal FeaturesImplementation of V.32terbo Triple Modem Module Modem Connections To The Central Site Typical ApplicationsRegistering Ownership of your Triple Modem Module Pack Contents ChecklistPre-installation Requirements Triple Modem Module Overview Installation and OperationInstalling The Module Installing The Rear Card Installing the Rear CardExample of Installing a Front Card Installing the Front CardConnecting the Cables Front Panel LEDs Front Panel LEDs Installation and Operation Troubleshooting Guide TroubleshootingModem Health Modem DTE Connection Modem does not accept or echo back AT commandsModem Telephone Line Connection Troubleshooting Perform a local analogue loop test On-line Operation Dial Backup OperationPrivate-line Operation Transmitter / Receiver Specifications Modem SpecificationInterface PIN Assignments Autodial Autoanswer Protocols Physical DescriptionGeneral Approvals Requirements Approvals InformationAll the other apparatus shall comprise only Appendix a Modem Specification and Interface PIN Assignments Ringer Equivalence 21/V.11 DTE Port Pin Assignments24/V.28 35/V.36 Pstn Port Cable Pin Assignments Private Line Port Cable Pin Assignments 3Com Bulletin Board Service On-line Technical ServicesCall the telephone number nearest you World Wide Web SiteSupport from Your Network Supplier Support from 3Com Returning Products for Repair Appendix B Technical Support Numerics IndexSend LED Limited Warranty 408 764-5000 3/18/96 How to Identify and Resolve Radio-TV Interference Problems