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B-13920-A2-GH30-40 October 1998

Troubleshooting

Overview B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview

This appendix points out basic problems that can occur when operating a 392xPlus modem. Use

Tables B-1 through B-8 to check out these problems. If you are having data communication

difficulties, such as periodic character loss, random errors, or constant format errors, use the

loopback tests described in Chapter 8, Test Branch. With these tests you can usually isolate the

fault in your system by using the process of elimination. If problems continue to occur, contact

your service representative.

Table B-1

Modem Health

Symptom

Action

The modem did not pass the

power-up self-test.

Contact your service representative.

The power LED does not light or the

LCD does not display information.

Make sure the modem’s ON/OFF switch is in the ON position.

Make sure the power supply is connected to the dc power receptacle on the

modem.

If the Power LED and/or LCD do not operate, contact your service

representative.

A problem is suspected after the

power-up self-test.

Perform a self-test via the modem’s DCP or type AT&T9 if using AT commands.

Perform a local analog loopback with a Pattern test. If the modem consistently

registers errors, contact your service representative.

If the modem passes the above tests and a problem still exists, then the

problem is probably not with your modem.

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Zhone 3920Plus Bedienerhandbuch Seite 269