Instruction manual

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting
555-650-140
Issue 1
June 1997
Control Unit Problems
Page 4-38
Module Problems
■ If errors indicate that the module is faulty, record them on the module
repair tag immediately after running the test.
NOTE:
If the system does not recognize a 408 GS/LS-MLX module during testing,
check the release number of the system. The 408 GS/LS-MLX module
does
not work with Releases 1.0 or 1.1. An 008 MLX module must be
used to provide extension jacks with Releases 1.0 or 1.1.
To run a module test, follow the steps below.
To determine which modules are suspect, read the error logs and
review any user-reported problems.
If the error logs indicate the processor is the problem, refer to
‘‘
Processor Problems’’, earlier in this chapter, to service the
processor before continuing.
Replacing a faulty processor may resolve module problems.
Busy-out or reset the module.
See ‘‘Busy-Out and Reset’’
for general guidelines.
Run the internal loopback test.
See ‘‘Internal Loopback Test’’
, later in this chapter. If errors occur, record
them as described in “Considerations” above.
Run the board controller test.
See ‘‘Board Controller Test’’
, later in this chapter. If errors occur, record
them as described in “Considerations” above.
For MLX modules (008 MLX and 408 GS/LS-MLX) and 800 NI-BRI
modules, continue with the B-Channel Loopback test.
See ‘‘B-Channel Loopback Test’’
, later in this chapter. If errors occur,
record them as described in “Considerations” above.
For 800 NI-BRI modules, continue with the NI-1 BRI Provisioning
Test.
See ‘‘800 NI-BRI Module Problems’’
later in this chapter. If errors occur,
record them as described in “Considerations” above.