Demand test descriptions and error codes - Avaya Support

● There has been a spontaneous PNC interchange.
● The standby PNC has been released from busy-out.
PNC-DUP (PNC Duplication)
● A system reset of level 2 or higher has taken place.
The Refreshed field may show y when the standby is partially unrefreshed. An interchange into
an incompletely refreshed standby results in dropped calls. This can happen when a more
severe fault occurs on the active PNC, or when set pnc interchange is used with the
override option.
PNC Interchanges
PNC spontaneous interchanges occur when PNC duplication software determines that the SOH
of the standby PNC is better than that of the active PNC. PNC-DUP executes a spontaneous
interchange only when a message from a PNC component MO sends a message indicating that
either a fault has occurred on the active PNC, or a fault has been resolved on the standby PNC
such that the state of health of the active PNC is now lower than that of the standby.
This message will usually indicate the type and location of the failed connectivity component. A
corresponding major or minor alarm is logged by the reporting MO, stimulating an alarm report.
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 PNs are deactivated as
indicated by the amber LEDs going from flashing to on solid.
2. The EIs in IPSI port networks are interchanged as indicated by the new standby EI amber
LED off and the new active EI amber LED on solid.
3. One by one the EIs in non IPSI port networks are interchanged as indicated by new
standby EI amber LED turning off and the new active EI amber LED flashing (2 seconds
on, 200 milliseconds off). At this point the interchange is functionally complete.
4. The SNIs amber LEDs are updated. so that the SNIs on the active SN have amber LEDs
on, while the standby SN’s SNIs amber LEDs turn off.
Certain conditions may interfere with the normal execution of the interchange:
1. In a faulted spontaneous interchange it is possible the PN 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.
Issue 5 May 2009 763