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SNC-BD (Switch Node Clock Circuit Pack)
Issue 1 June 2005 2003
4. Use test alarm long clear category exp-intf. Do not busyout the Expansion
Interface circuit packs.
5. Wait 5 minutes for SNI-BD, SNI-PEER, FIBER-LK, and DS1C-BD alarms to clear, or enter
clear firmware-counters.
High-Reliability System (Duplicated Server
and SNCs, Unduplicated PNC)
This procedure is nondestructive.
1. If the SNC circuit pack to be replaced is the active SNC in the switch node carrier (yellow
LED is on solid), use set switch-node-clock to set the standby SNC to active.
2. When the SNC circuit pack is in standby mode (yellow LED is off), pull out the SNC circuit
pack to be replaced.
3. Insert a new SNC circuit pack.
4. Wait for the SNC to reset. (The red and green LEDs light and then go out.) The yellow LED
should be off because the SNC circuit pack is in standby mode.
Critical-Reliability System (Duplicated Server
and PNC)
!
WARNING:
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 WRN 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.
To replace an SNC circuit pack in a critical-reliability system:
1. Enter status pnc.
Verify that the component to be replaced is on the standby PNC.
2. Enter busyout pnc.
3. Enter busyout board location.
4. Replace the circuit pack.
5. Enter release board location.
!
CAUTION:
CAUTION: Do not busyout any Expansion Interface circuit pack after this point.
6. Enter test alarms long clear for category exp-intf.