3Com 980/000048/001 manual All the other apparatus shall comprise only

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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.

This modem is suitable for use on telephone lines provided with loop-disconnect or multi-frequency (MF) dialling facilities.

This modem is suitable for household, office and similar indoor use, but is not suitable for use on an extension to a payphone, or a 1+1 carrier system.

This unit may be used on circuits with CEPT L1 signalling at a nominal frequency of 2280 Hz. It does not require signalling or otherwise employ the frequency range 0 Hz to 200 Hz and there is no requirement for DC from the telephone line for correct operation.

This unit causes a line voltage drop of 0.2 V at a line current of 40 mA

Interference and Safety Requirements

Radio frequency interference may be caused by incorrect operation or inadequate maintenance of this equipment. This unit is intended for use with screened digital cables.

If any of your apparatus is not operating correctly, you should immediately remove it from the telephone line as this may harm the telephone network (GSTN).

The approval of this unit for connection to GSTN or private speech band circuits is invalid if the apparatus is subject to modification in any material way not authorized or if it is used with or connected to internal software which has not been formally accepted.

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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 This table shows where to find specific information How to Use This GuideAbout this Guide IntroductionText conventions used in this guide are ConventionsIcon conventions that are used throughout 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 Modem Health TroubleshootingTroubleshooting Guide Modem DTE Connection Modem does not accept or echo back AT commandsModem Telephone Line Connection Troubleshooting Perform a local analogue loop test Private-line Operation Dial Backup OperationOn-line Operation Interface PIN Assignments Modem SpecificationTransmitter / Receiver Specifications 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