TDM-BUS (TDM Bus)
Issue 1 May 2002
8-1597555-233-143
Part 1
1. If spare TDM/LAN cable assemblies and TDM/LAN bus terminators are not
available, go to Part 2 of this procedure.
2. Power down the EPN.
3. Replace every TDM/LAN cable assembly and both TDM/LAN bus
terminators.
4. Restore power to the EPN.
5. Run the test tdm P command to determine whether the TDM-bus fault is
still present.
6. If the TDM-bus fault is resolved, the procedure is finished. Otherwise,
continue with Part 2.
Part 2
1. Terminate the TDM bus so that it extends only across the carrier that
contains the active Expansion Interface.
2. Run the test tdm P command to determine whether the TDM-bus fault is
still present.
If the shortened TDM bus does not extend to a carrier continuing the Tone
Detector circuit pack, the:
■ Non-control channel test (#297) will not be able to run
■ Bus that the non-control channel was on will not be tested.
If this is the case, run the set TDM PC command to move the control
channel to the non-active bus. The status port-network P command will
show which bus is currently active. After the bus switch has occurred, run
the test tdm P command again to determine whether the newly active bus
is faulted.
Another option is to move a Tone Detector circuit pack to an empty slot (if
one is available) in the carrier where the TDM bus is terminated. This
would:
■ Allow both the control channel and non-control channel tests to run
■ Not require the set tdm P command to be run
3. If none of the TDM-bus tests fail, extend the TDM bus to another carrier,
and repeat the procedure in the previous step. When a carrier that causes
the fault to recur is added, perform Procedure 2 for only the circuit packs in
that carrier.
4. If any of the TDM-bus tests fail and Procedures 2 and 3 did not resolve the
problem, the added carrier(s) are defective and must be replaced.
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