DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1706TDM-BUS (TDM Bus)
9
pack at a time. This option is slower, b ut it disrupts only the users of a sing le
circuit pack.
1. Remove one or several circuit pac ks as appropriate. Any c ircuit packs that
reside on the TDM Bus that have been recently inser ted should be
checked first.
If you decide to remove multip le circuit pac ks, consider working with an
entire carrier at a time to more quic kly and reliably de termine which circuit
packs are
not
the source of trouble.
2. Run

test tdm P

to determine if the TDM Bus fault is still present.
3. If any of the TDM Bus tests fail:
■Determine if the backpl ane pins in the removed circ uit pack’s slot
appear to be bent.
■If the backplane p ins are not bent, reinsert the circuit p ack(s), and
perform Procedure 2 for the next set of c ircuit packs.
■If the backplane p ins are bent, remove power to this carrier in the
manner described previously.
■Straighten or replace the pins an d reinsert the circuit pac k.
■Restore power and repeat Procedure 2, b eginning with Step 2, for
the same circuit pac k(s).
4. If none of the TDM Bus tests fail:
■Reinsert the circuit pack(s)

one at a time,

and repeat the following
substeps until all of the c ircuit packs have b een reinserted.
■Run test tdm P to d etermine if the TDM Bus fault has returned.
■If any of the TDM Bus tests fail, the reinserted circuit p ack is
defective. Replace this c ircuit pack and repeat this procedure for
the next circuit pac k.
■If none of the TDM Bus tests fail when all of the circuit p acks have
been reinserted, the prob lem has been fixed and the p rocedure is
completed.
Continue with Procedure 3 if all the port c ircuit packs have b een checked, bu t
the TDM Bus fault is still not resolved.
Procedure 3
This procedure removes and reinser ts SPE and EPN control circuit packs, as
listed in the table at the b eginning of this section. In the PPN proce ssor carrier
(SPE), the TDM Bus terminates on slots 11-15. When running diagnostics in the
PPN, the following circuit packs s hould be tested:
■TN1655 Packet Interface (three slots available p er carrier)
■TN768/TN780 Tone/Clock