Troubleshooting - Paradyne Comsphere 3920Plus Installation And Operation Manual

Overview
This appendix points out basic problems that can occur when operating a 392xPlus 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 the Test section of Chapter 4. With these tests you can usually isolate
the fault in your system by using the process of elimination. If problems continue to occur,
contact AT&T Paradyne's Customer Assistance Center.
Symptom
The modem did not pass the
power-up self-test.
The power LED does not light or the
LCD does not display information.
A problem is suspected after the
power-up self-test.
3920-A2-GN31-10

Troubleshooting

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B-1
Modem Health
Contact your AT&T Paradyne service representative.
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 AT&T Paradyne
service representative.
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 AT&T Paradyne service representative.
If the modem passes the above tests and a problem still exists, then the
problem is probably not with your modem.
April 1995
B-1
Action
B
B-1