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)
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4. Once the failed comp onent is replaced, test the stand by PNC component
from the terminal to ensure the replacement is func tioning properly.
5. When confident that the prob lem has been resolved, as ind icated by a
state of health with all zeros, (status pnc), unlock and release the p n c .
Note that no further PNC interchange is required since you can test the
standby PNC as thoroughly as the ac tive.
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 (cold 2) or 3 (cold1) does not change
which PNC is active. If a PNC interchange was in p rogress when the reset
took place, the PNC interchange sti ll goes to completion.
■If a system reset level 1 (warm) takes plac e during a PNC interchange, the
reset is escalated to level 2 (cold 2).
Fault Isolation Using Duplicated PNC
PNC duplication, can, in so me cases aid in the isolation of faults. PNC
interchanges can b e used to help indic t 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 attrib uted to one board or the othe r. If the packet bus
transceivers on either the PKT-INT or EI fail, it will be apparent that the two
boards cannot co mmunicate, but it will not be c lear which board i s at fault.
In this case, a planned interc hange of the PNC can be used to indict one
of the two boards. If the interchang e cures the problem, the EI was at fault.
If the interchange does not c ure the problem, the PKT-INT is suspect,
provided there are no PKT-BUS faults.
■A similar relationship exists for the EPN Archangel (ac tive EI) and certain
TDM bus problems. If the EAA is unable to c ommunicate with a port board
over the TDM bus, either the EAA has a fault, the port b oard has a fault, or
there is a problem with the TDM bus itself. If TDM bus ma intenance tests
find no problems with the b us, then it is either the port b oard or the EAA. It
may be simpler to replace the port board than to request a PNC
interchange. However, if it is not c lear which port b oard may be at fault, or
maintenance is being p erformed remotely, verify that the EAA is not at fault
by executing a PNC interchang e. If the interchange solves the p roblem,
then the EAA is faulty. If the problem persists after the interchang e, but
TDM bus maintenance finds no p roblem, then the port board is faulty.