Instruction manual

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting
555-650-140
Issue 1
June 1997
Control Unit Problems
Page 4-59
Module Problems
Restoring the Module
When you are finished running module tests, be sure to restore the module. See
‘‘
Restore’’, earlier in this chapter.
B-Channel Loopback Test
This test verifies that specific communication paths on the MLX or 800 NI-BRI
modules are operational. If you have not read “Module Test Process” above, do
so.
Summary
Console Procedure Menu→Maintenance→Slot→Dial the slot
no.→
Enter→BchLoopback
PC Procedures → →Type the slot no.→ →
Appropriate Modules This test can be run only on MLX or 800 NI-BRI
modules.
Time Estimate Approximately 1.5 minutes.
Busy-Out or Reset Before beginning the test, busy-out or reset the
module being tested. Both Busy-Out and Reset are in
the Slot menu, which you can access by doing the
following from the console:
Menu→
Maintenance→Slot
See ‘‘Busy-Out and Reset’’, earlier in this chapter, for
additional information.
Interrupting the Test Interrupt the test by selecting
Exit.
Test Failure If the test fails, record the errors on the repair tag and
replace the module.