Maintenance Object Repair Procedures
555-233-123
10-1708 Issue 4 May 2002
An aux data value of 1 indicates the last reported TDM Bus corruption was
on the Non-Control channel bus.
If this error is logged on both TDM Buses (A and B) on the PPN within two
or three minutes, the red LED of several circuit packs may or may not be lit
and there could be Switch Control errors. Under these circumstances do
the following:
■ Display the Hardware Error Log via the display errors command
and look for SW-CTL (Switch Control) errors.
■ If there are any errors logged against the Switch Control, try to
resolve them.
■ Test the TDM Bus via the test tdm P command.
■ If all the TDM Bus tests pass, the problem has been fixed.
■ If some of the TDM Bus tests fail, replace the Duplication Interface
circuit pack in the A carrier (see Chapter 6, ‘‘Reliability Systems: A
Maintenance Aid’’ for details). None of the Duplication Interface
circuit pack tests detect this particular type of failure. Therefore, all
its tests may still pass.
■ Test the TDM Bus via the test tdm P command.
■ If all the TDM Bus tests pass, the problem has been fixed.
c. This error indicates the TDM Bus was switched to the other bus due to
TDM Bus corruption. The aux data value is not meaningful and no action is
required.
d. This error indicates that some time slots are corrupted in the specified TDM
Bus. The Minor alarm is raised when there are more than 50 bad time slots
in the bus. The aux data indicates the number of bad time slots found by
the test.
e. This error indicates that some time slots are corrupted in the specified TDM
Bus. The Warning alarm is raised when there are more than 10 bad time
slots but less than or up to 50 bad ones in the bus. The aux data value
indicates the number of bad time slots found by the test.
f. This error indicates the idle time slot test found less than 10 bad time slots
in the TDM Bus. The aux data value indicates the number of bad time slots
found by the test. There is no alarm associated with this error.
g. These errors indicate communication problems. On a High or Critical
Reliability system, TDM Bus maintenance may switch the Control Channel
bus and/or Tone bus to the other bus. Test the TDM Bus via the test tdm P
command and follow the procedures according to the error codes reported
from the test.
The aux data value shows the Angel ID number for which a downlink
message was lost.
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