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TDM-BUS (TDM Bus)
Issue 5 October 2002
1657
555-233-119
!
WARNING:
Since the TDM Bus fault isolation procedure involves removing circuit packs
and possibly disconnecting entire carriers, the procedure is extremely
destructive to the port network that contains the TDM Bus being tested. If
possible, this procedure should be used after hours or during hours with
minimum system use.
As circuit packs are removed or entire carriers are disconnected, any active calls
terminating on those circuit packs or carriers are dropped. If the system technician
has any hints about a particular circuit pack that may be causing the TDM Bus
problem (for example, a new circuit pack was inserted into the Port Network just
before the TDM Bus problem appeared), then those hints should be investigated
before performing this procedure.
For this procedure, make sure at least one Tone Detector circuit pack is in the
same Port Network in which the TDM Bus fault is being isolated. The Tone
Detector circuit pack is needed by maintenance to test the TDM Bus.
Procedure 1
This procedure is an attempt to isolate the TDM Bus fault to circuit packs that are
essential to the system operation. For each of the following circuit packs, perform
Procedure 1.
1. Display the Hardware Error and Alarm Logs for the circuit pack via the
display errors and display alarms commands.
2. If there are errors for the circuit pack, refer to its Maintenance
documentation and try to resolve the errors.
3. Whether or not all the errors can be cleared, test the TDM Bus again via
the test tdm P command.
4. If some TDM Bus tests fail, continue with the next circuit pack.
5. If there are no more circuit packs in the list, go to Procedure 2.
6. If all the TDM Bus tests pass, the problem has been fixed.
Circuit Pack Error Log Names
Tone-Clock TONE-BD, TONE-PT, and
TDM-CLK
Network Control SW-CTL
Tone Detector DETR-BD, GPTD-PT, and
DTMR-PT