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C-13810-A2-GB30-20 November 1996
Troubleshooting
Overview C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
This
appendix points out basic problems that can occur
when operating a 3800 Series modem. Use T
ables C-1
through C-6 to check out these problems. If you are
having data communication dif
ficulties, such as periodic
character loss, random errors, or constant format errors,
use the loopback tests described in Chapter 8,
Test
Branch
. W
ith 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 C-1
Modem Health
Symptom
Action
Modem did not pass
power-up self-test
Contact your service representative.
Power LED does not
light
LCD does not display
Make sure the modem’s ON/Off switch is in the ON position.
Make sure the ac power transformer is connected to the ac power receptacle.
If 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 likely not
with your modem.
C