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B-13825-A2-GB30-20 November 1996
Troubleshooting
Overview B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Firmware Download B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Download Failure B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
This
appendix points out basic problems that can occur
when operating a 3825Plus modem. Use T
ables B-1
through B-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 associated with the &T command.
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.
If you would like to download the latest 3825Plus
firmware from the Automatic Firmware Download
Center
, see the instructions at the end of this chapter
. If
you would like to copy the software in your modem to a
remote 3825Plus modem, see the &&P command in
Chapter 4.
Table B-1
Modem Health
Symptom
Action
Modem did not pass
power-up self-test
Contact the Customer Assistance Center (1-800-237-0016).
Power LED does not light
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 the Power LED does not operate, contact the Customer Assistance Center.
A problem is suspected
after the power-up self-test
Perform a self-test using the AT&T9 command.
Perform a local analog loopback with a Pattern test. If the modem consistently registers
errors contact the Customer Assistance Center
errors, contact the Customer Assistance Center.
If the modem passes the above tests and a problem still exists, then the problem is likely
not with your modem.
B