3Com 980/000048/001 manual Autodial Autoanswer

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A-2 APPENDIX A: MODEM SPECIFICATION AND INTERFACE 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.

Autodial - Autoanswer

Method

Pulse dial. 10 pps rate. Make period 33 msec. Break period 67 msec (UK version). Interdigit period 800msec. Tone dial. On time 85 msec. ID time 85 msec. Duty cycle 50%.

Line Interface

600 ohm impedance. Bell tinkle suppression provided. Old and new dial tone detection. Secondary dial tone detection for PABX use. Progress tones and answer tone detection.

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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 About this Guide How to Use This GuideThis table shows where to find specific information IntroductionText conventions used in this guide are ConventionsIcon conventions that are used throughout this guide are Additional Safety Information Keep the unit away from radiators and heat sourcesAbout this Guide Triple Modem Module Principal Features Support for dial-up transmission protocolsImplementation of V.32terbo Triple Modem Module Typical Applications Modem Connections To The Central SitePack Contents Checklist Registering Ownership of your Triple Modem ModulePre-installation Requirements Triple Modem Module Installation and Operation OverviewInstalling The Module Installing the Rear Card Installing The Rear CardInstalling the Front Card Example of Installing a Front CardConnecting the Cables Front Panel LEDs Front Panel LEDs Installation and Operation Modem Health TroubleshootingTroubleshooting Guide Modem does not accept or echo back AT commands Modem DTE ConnectionModem 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 Physical Description ProtocolsApprovals Information General Approvals RequirementsAll the other apparatus shall comprise only Appendix a Modem Specification and Interface PIN Assignments Ringer Equivalence DTE Port Pin Assignments 21/V.1124/V.28 35/V.36 Pstn Port Cable Pin Assignments Private Line Port Cable Pin Assignments On-line Technical Services 3Com Bulletin Board ServiceWorld Wide Web Site Call the telephone number nearest youSupport from Your Network Supplier Support from 3Com Returning Products for Repair Appendix B Technical Support Index NumericsSend LED Limited Warranty 408 764-5000 3/18/96 How to Identify and Resolve Radio-TV Interference Problems