DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-206ATM PNC-DUP (ATM PNC Duplication)
3
5. Once the failed comp onent is replaced, use the status pnc c ommand to
check the health standb y PNC component.
6. When confident that the prob lem has been resolved, as indic ated by a
state of health with all zeros, unlock (set pnc unlock) and release
(release pnc) the PNC. Note that no further PNC interchange is required
since you can test the stand by PNC as thoroughly as the active.
Interactions: SPE resets and PNC interchanges
■After a reset system 4 (reboot), the A PNC is always the active.
■A system reset of level 1 (warm), 2 (cold 2) or 3 (cold1) does not c hange
which PNC is active. If a PNC interchange was in p rogress when the reset
took place, the PNC interchange c ontinued until comp letion.
■If a reset system 1 (warm) takes place during a PNC interchange, the
reset is escalated to level 2 (co ld2).
Fault isolation using Duplicated PNC
In some cases, PNC duplic ation can aid in the fault isolation p rocedure. PNC
interchanges can b e used to help isolate the faulty hard ware. Two examples
demonstrating this techniq ue follow:
1. There is a fault that can occur in either the PPN ATM-EI or the PKT-INT
which cannot be read ily 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, b ut it will not be clear which b oard is at fault. In this
case, a planned interc hange of the PNC can be used to ind icate which of
the two boards.
— If the interc hange cures the prob lem, the ATM-EI was at fault.
— If the interc hange does not cure the p roblem, the PKT-INT is
suspect, provid ed there are no PKT-BUS faults.
2. A similar relationship exists for the EPN Archangel (EAA - the ac tive
ATM-EI) and certain TDM bus problems. If the EAA is unable to
communicate with a por t board over the TDM bus, either the EAA has a
fault, the port board has a fau lt, or there is a problem with the TDM bus
itself. If TDM bus maintenance tests find no p roblems with the bus, then it
is either the port board or th e EAA. It may be simpler to replace the p ort
board than to request a PNC interchang e. However, if it is not clear which
port board may b e at fault or maintenance is being performed remotely,
verify that the EAA is not at fault by executing a PNC interc hange. If the
interchange solves the prob lem, then the EAA is faulty. If the problem
persists after the interchange, b ut TDM bus maintenance finds no
problem, then the port b oard is faulty.