DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1305PNC-DUP (PNC Duplication)
9
4. Once the failed component is replaced, test the standby PNC component
from the terminal to ensure the replacement is functioning properly.
5. When confident that the problem has been resolved, as indicated by a
state of health with all zeros, (
status pnc
), unlock and release the pnc.
Note that no further PNC interchange is required since you can test the
standby PNC as thoroughly as the active.
Interactions: SPE Resets and PNC Interchanges
■ After a system reset 4 (reboot), the A PNC is always the active.
■ A system reset of level 1 (warm), 2 (cold2) or 3 (cold1) does not change
which PNC is active. If a PNC interchange was in progress when the reset
took place, the PNC interchange still goes to completion.
■ If a system reset level 1 (warm) takes place during a PNC interchange, the
reset is escalated to level 2 (cold2).
Fault Isolation Using Duplicated PNC
PNC duplication, can, in some cases aid in the isolation of faults. PNC
interchanges can be used to help indict the faulty hardware. Following are two
examples demonstrating this technique.
■ There is a fault which can occur in either the PPN 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 EI fail, it will be apparent that 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 indict one
of the two boards. If the interchange cures the problem, the EI was at fault.
If the interchange does not cure the problem, the PKT-INT is suspect,
provided there are no PKT-BUS faults.
■ A similar relationship exists for the EPN Archangel (active 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.
