Filter
Top Products
C-13821-A2-GB20-30 February 1998
Troubleshooting
Overview C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Firmware Download C-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Download Failure C-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
This appendix points out basic problems that can occur
when operating a 3821Plus modem. Use Tables C-1
through C-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 associated with the &T command.
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.
If you would like to download the latest 3821Plus
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 3821Plus modem, see the &&P1 command in
Chapter 4.
Table C-1
Modem Health
Symptom
Action
Modem did not pass
power-up self-test
Contact the Customer Assistance Center (1-800-237-0016).
LEDs do not light
Verify that the modem card is fully seated in its slot.
Verify that the power supply for the 3000 Series Carrier is properly installed and is receiving
power.
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.
C