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TDM-BUS (TDM Bus)
Issue 1 June 2005 2241
Procedure 3: Removing and Reinserting PN
Control Circuit Packs
This procedure removes and reinserts a PN’s control circuit packs. Use this procedure to test:
● TN570 Expansion Interface
● TN768, TN780 Tone-Clock
Check the Tone-Clock circuit pack next-to-last. Check the Expansion Interface circuit pack
(TN570) last, because removing this circuit pack disconnects its PN. In a system with duplicated
PNC, disruption of traffic can be minimized by following the procedure for the standby TN570
Expansion Interface circuit pack, and then entering reset pnc interchange. The formerly
active Expansion Interface will be standby and can be checked without affecting the PN’s
service.
For instructions, at each step in a procedure that requires the removal and/or replacement of a
circuit pack, refer to the documentation for the specific circuit pack’s MO. Server and/or PNC
interchanges may be required to complete these steps with the least amount of service
disruption.
Procedure for PN with Unduplicated PNC
1. Remove the suspected circuit pack.
2. As in Procedure 2: Removing and Reinserting Port Circuit Packs
on page 2239, determine
if the backplane pins on the back of 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 PN.
e. Run test tdm P to determine whether the TDM-bus fault still exists.
f. If none of the TDM-bus tests fail, the procedure is complete.
g. If some of the TDM-bus tests fail, replace the suspected circuit pack, and go to step 4.
If not: Replace the circuit pack and turn the power back on to reboot the system.
4. Run test tdm P to determine whether the TDM-bus fault is still present.