DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1384SNC-BD (Switch Node Clock Circuit Pack)
9
database. Once the fir mware failure database is cleared , the failure audit test
(#777) will pass. If problems s till exist, the firmware will increment its error
counters and the failure audit test will begin failing ag ain.
This command should not b e used as a replacement for the rep air procedures
associated with the hardware error log entries. This command may be us eful if a
problem has been fixed and off-board alarms assoc iated with the probl em 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 undup licated SNCs disrup ts service.

Standard Reliability System (Simplex SPE, 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 b e 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. Test alarm long clear categ o r y exp-intf. Do not busyout the Expansion
Interface circuit packs.
5. Wait 5 minu tes fo r SNI-B D, SNI -PEER, FIBER- LK, an d DS1 C ONV-B D
alarms to clear, or enter clear firmware-counters.
High Reliability System (Duplicated SPE and SNCs, Simplex PNC)
This procedure is non-destructive.
1. If the SNC circuit pack to be replaced is the active SNC in the switch node
carrier (yellow LED is on solid), first set the standb y SNC to active via the
set switch-node-clock command.
2. When the SNC circuit pack is in stand by mode (yellow LED is off), pull out
the SNC circuit pack to b e 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 since the SNC circuit p ack is in standby
mode.