Avaya S8700 Maintenance Manual page 972

Maintenance-Object Repair Procedures
3. Busyout the PNC with the busyout pnc command.
4. Use fault isolation and component testing procedures for the individual
PNC components, just as for a simplex PNC. Replacement of components
does disrupt operation of the active PNC.
5. Once the failed component is replaced, use the status pnc command to
check the health standby PNC component.
6. When confident that the problem has been resolved, as indicated by an
all-zero state of health, unlock (set pnc unlock) and release (release pnc)
the PNC. Note that no further PNC interchange is required since you can
test the standby PNC as thoroughly as the active.
Interactions: Server Resets and PNC Interchanges
A system reset of level 1 (warm), 2 (cold2) or 4 (reboot) does not change
which PNC is active. If a PNC interchange was in progress when the reset
took place, the PNC interchange continued until completion.
If a reset system 1 (warm) takes place during a PNC interchange, the
reset is escalated to level 2 (cold2).
Fault Isolation Using Duplicated PNC
In some cases, PNC duplication can aid in the fault isolation procedure. PNC
interchanges can be used to help isolate the faulty hardware. Two examples
demonstrating this technique follow:
1. There is a fault that can occur in either an IPSI port network's ATM-EI or
the PKT-INT which cannot be readily attributed to one board or the other. If
the packet bus transceivers on either the PKT-INT or ATM-EI fail, the two
boards cannot communicate, but it will not be clear which board is at fault.
In this case, a planned interchange of the PNC can be used to indicate
which of the two boards.
— If the interchange cures the problem, the ATM-EI was at fault.
— If the interchange does not cure the problem, the PKT-INT is
2. A similar relationship exists for the EPN Archangel (EAA - the active
ATM-EI) and certain TDM bus problems. If the EAA is unable to
communicate with a port board over the TDM bus, either the EAA has a
fault, the port board has a fault, or there is a problem with the TDM bus
itself. If TDM bus maintenance tests find no problems with the bus, then it
is either the port board or the EAA. It may be simpler to replace the port
board than to request a PNC interchange. However, if it is not clear which
port board may be at fault or maintenance is being performed remotely,
verify that the EAA is not at fault by executing a PNC interchange. If the
interchange solves the problem, then the EAA is faulty. If the problem
persists after the interchange, but TDM bus maintenance finds no problem,
then the port board is faulty.
8-250 Issue 1 May 2002
suspect, provided there are no PKT-BUS faults.
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