DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1303PNC-DUP (PNC Duplication)
9
In the less common situation when the resolution of a fault on the standby
renders it more healthy than a simultaneously faulted active PNC, the message
will indicate the type and location of the
improved
component.
Once the interchange completes, the failed component will be on the standby
PNC. A demand interchange can be requested in the presence or absence of
standby PNC faults. The following sequence of actions can be observed during a
fault-free interchange:
1. The Expansion Interfaces currently acting as archangels in the EPNs are
deactivated as indicated by the yellow LEDs going from flashing to on
solid.
2. The PPN EIs are interchanged as indicated by the new standby EI yellow
LED off and the new active EI yellow LED on solid.
3. One by one the EPN EIs are interchanged as indicated by new standby EI
yellow LED turning off and the new active EI yellow LED flashing (2
seconds on, 200 milliseconds off). At this point the interchange is
functionally complete.
4. The SNIs yellow LEDs are updated. so that the SNIs on the active SN have
yellow LEDs on, while the standby SN’s SNIs yellow LEDs turn off.
Certain conditions may interfere with the normal execution of the interchange:
1. In a faulted spontaneous interchange it is possible the EPN/EPNs directly
affected by the fault will be the last to interchange.
2. A user directly affected by the single fault instigating a PNC interchange
can experience a momentary outage of voice path connectivity during the
switch.
3. If faults exist on both the standby and active PNC, it is possible to have
some EPNs go out of service while others are returned to service.
4. The new standby SNIs yellow LED my not be off due to a fault in the line of
communication path to the standby SNIs. In a multi-fault interchange,
LEDs on the new active SNIs may not be on for the same reason.
In any multifault situation, rely on
status pnc
to determine which is the active
PNC.
PNC duplication informs Timing Synchronization maintenance when a PNC
interchange has been completed and indicates which PNC is active. This will
cause Synchronization to audit and insure that the primary source for
synchronization of Tone-Clocks in each PN is supplied by a path associated with
the active PNC.
