Digicom 3910, 3911 operation manual Troubleshooting B, Table B-1, Modem Health, Symptom Action

Troubleshooting B

Overview

This appendix points out basic problems that can occur when operating a 391x Series modem. Use Tables B-1 through B-6 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	Contact your service representative.
power-up self-test.
The power LED does not light or	Make sure the modem’s ON/OFF switch is in the ON position.
the LCD does not display	Make sure the power supply is connected to the dc power receptacle
information.
	on the modem.
	If the Power LED and/or LCD do not operate, contact your service
	representative.
A problem is suspected after the	Perform a self-test via the modem’s DCP or type AT&T9 if using AT
power-up self-test.	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.

3910-A2-GN32-40 September 1998 B-1