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TDM-BUS (TDM Bus)
Issue 1 June 2005 2245
After cabling changes are made and verified, power must be restored to the PN. Circuit packs in
carriers outside the shortened bus are not inserted. As a result, these circuit packs are alarmed.
Ignore these alarms for now. Every alarm should be resolved when the cabinet is restored to its
original configuration.
Procedure 4 is organized into two parts. Part 1 attempts to clear a TDM-bus fault by replacing
every bus cable and terminator within a PN. Part 2 attempts to isolate the fault to a particular
carrier by extending the TDM bus from the control carrier to additional carriers one at a time.
!
WARNING:
WARNING: Power must be removed from the entire PN before any cables or terminators are
removed. Failure to follow this procedure can cause damage to circuit packs and
power supplies, and can be hazardous to the technician.
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 PN.
3. Replace every TDM/LAN cable assembly and both TDM/LAN bus terminators.
4. Restore power to the PN.
5. Run test tdm P 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 test tdm P 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 set tdm PC to move the control channel to the non-active bus. The
status port-network P command shows which bus is currently active. After the bus
switch has occurred, run test tdm P 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 set tdm P command to be run