DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1707TDM-BUS (TDM Bus)
9
■ UN332 MSSNET
■ TN570 Expansion Interface
Although the Packet Interface circuit pack does not communicate over the TDM
bus, the bus does terminate at those slots. TDM Bus failures could be caused by
bent backplane pins.
When running TDM Bus diagnostics in an EPN, the following circuit packs should
be tested with this procedure:
■ TN570 Expansion Interface
■ TN768/TN780 Tone/Clock
When using this procedure on an EPN, the Tone/Clock circuit pack should be the
next-to-last one checked. The Expansion Interface circuit pack (TN570) should
be the last one checked, since removing this circuit pack disconnects its EPN. In
a system with duplicated PNC, disruption of traffic can be minimized by following
the procedure for the standby TN570 Expansion Interface circuit pack, then
entering a
reset pnc interchange
. The formerly active Expansion Interface will
now be standby and can be checked without affecting service to the EPN.
At steps in the procedure that require the removal and/or replacement of circuit
packs, refer to the Maintenance Object documentation for the given circuit pack
for instructions. SPE and/or PNC interchanges may be required to complete
these steps with the least amount of service disruption.
Procedure for PPN with Simplex SPE or EPN
with Simplex PNC
1. Remove the suspect circuit pack.
2. As in Procedure 2, determine if the backplane pins in the removed circuit
pack’s slot are bent.
3. If the backplane pins are bent, do the following:
a. Power down the control carrier as described in the previous
warning statement.
b. Straighten or replace the pins.
c. Insert the same circuit pack.
d. Turn the power back on to reboot the system or to restart the EPN.
e. Run test tdm P to determine if the TDM Bus fault still exists.
f. If none of the TDM Bus test fail, the procedure is complete.
g. If some of the TDM Bus tests fail, replace the suspect circuit pack
and go to step 6.
4. If the backplane pins are not bent, replace the circuit pack.
5. Turn the power back on to reboot the system.
