Demand test descriptions and error codes - Avaya Support

SNC LEDs
SNC-BD (Switch Node Clock Circuit Pack)
SNC circuit packs have the standard red, green, and yellow LEDs. The red and green LEDs
operate as usual: red means an alarm condition and green indicates maintenance testing in
progress. If the yellow LED is lit, this indicates that the SNC is the active circuit pack, supplying
timing to the carrier. In a duplex- or high-reliability system (unduplicated PNC), the standby SNC
in a carrier is unlit. In a critical-reliability system (duplicated PNC), an SNC in a standby switch
node carrier is lit since it is providing timing for the standby carrier.
Clear Firmware-Counters Command
SNC firmware generates error reports independently of demand tests. Therefore, test board
location clear does not affect the error status reported by firmware. The clear
firmware-counters command clears every firmware-generated error unconditionally.
Use clear firmware-counters location to send a downlink message to the SNC circuit
pack, causing it to clear out its firmware error counters and failure database. When the firmware
failure database is cleared, the Failure Audit (#777) will pass. If problems still exist, the firmware
increments its error counters and the failure audit test begins failing again.
Do not use this command instead of the repair procedures associated with the error log entries.
This command may be useful if a problem was fixed but the off-board alarms associated with
the problem are still active.
Replacing SNC Circuit Packs
WARNING: Do
not power down a Switch Node carrier to replace a circuit pack. Replacing an
SNC on a system with unduplicated SNCs disrupts service.
Standard-Reliability System (Unduplicated server, PNC, and SNCs)
This procedure is destructive. Any links through the switch node carrier will go down.
1. Pull out the SNC circuit pack to be replaced.
2. Insert a new SNC circuit pack.
3. Wait for the SNC to reset. (The red and green LEDs light and then go out. The yellow LED
should be on solid.)
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.
Issue 5 May 2009 849