Maintenance-Object Repair Procedures
555-233-143
8-778 Issue 1 May 2002
Replacing an EI Circuit Pack— Duplicated PNC
!
WARNING:
On a system with duplicated PNC, synchronization may be provided over a
combination of active and standby components. This condition is indicated
by an OFF-BOARD WARNING alarm against TDM-CLK with error type
2305. Repairs to standby PNC in this state may disrupt service. Otherwise,
if the active PNC is functional, replacement of a standby component will not
disrupt service.
Step Action Explanation/Caution
1. Enter busyout board UUCSS UUCSS = cabinet-carrier-slot address of the
circuit pack to be replaced.
2. Replace the circuit pack
3. Wait for the circuit pack to reset Red and green LEDs light and then go out.
If the red LED remains lit, see the previous
Note under ‘‘Expansion Interface LEDs’’.
4. Enter release board UUCSS CAUTION: Do not busyout any EI circuit pack
after this point.
5. Enter test alarms long clear for
category exp-intf
6. Wait 5 minutes for SNI-BD, FIBER-LK,
and DS1 CONV-BD alarms to clear, or
enter clear firmware counters a-pnc
Step Action Explanation/Caution
1. Enter status pnc. Verify that the component to be replaced is on the
standby PNC.
2. Enter busyout pnc.
3. Enter busyout board UUCSS. UUCSS represents the cabinet-carrier-slot address
of the circuit pack to be replaced.
4. Replace the circuit pack.
5. Enter release board UUCSS. CAUTION: Do not busyout any EI circuit pack after
this point.
6. Enter test alarms long clear for
category exp-intf.
7. Wait 5 minutes for SNI-BD, SNI-PEER,
FIBER-LK, and DS1 CONV alarms to
clear, or enter clear firmware
counters <a-pnc or b-pnc>.
Use the letter designation of the PNC that holds the
replaced component (the standby PNC).
8. Enter status pnc. If either PNC’s state of health (SOH) is not
“functional,” consult ‘‘PNC-DUP (PNC Duplication)’’
on page 8-1283.
9. Enter release pnc.
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