DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1302PNC-DUP (PNC Duplication)
9
3. Follow the appropriate diag nostic and repair p rocedures for the alarmed
PNC components just as with a simplex PNC. Both the alarm and error
logs should be examined to isolate the fault.
4. Verify that the related PNC SOH is restored to all zeros.
5. Release the standby PNC for busy-out.
Refresh and Unrefresh of the Standby PNC
In a fully functional PNC with healthy standby and active sides, the standb y PNC
has a complete set of call c onnections correspond ing to those in the active PNC.
If, however, the state of health of the standby PNC d egrades, a selective
unrefresh of those connections which utilize the faulted component(s) is
performed. If the health of the st andby PNC improves, a selective refresh of
connections on the affected route is performed. so that c all setup is consistent
between the active PNC and the healthy p arts of the standby PNC.
The Standby Refreshed? field on the status pnc screen does
not
refer to the
selective type of refresh. It refers only to a g lobal refresh which is performed
when:
■The system is initialized and PNC duplic ation is enabled.
■There has been a spontaneous PNC interchange.
■The standby PNC has been released from b usy-out.
���A system reset of level 2 or higher has taken p lace.
The refreshed field may display yes when in fact the standby is p artially
unrefreshed. An interchange into an inc ompletely refreshed standb y will result in
dropped c alls. This can happen when a more severe fault oc curs on the active
PNC, or when set pnc interchange is used with the override option.
PNC Interchanges
PNC spontaneous interchanges occ ur when PNC duplication software
determines that the SOH of the standby PNC is better than that of the ac tive PNC.
PNC-DUP executes a spontaneous interchange only wh en a message from a
PNC component maintenance obj ect sends a message ind icating that either a
fault has occurred on the ac tive PNC, or a fault has been resolved on the standb y
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 typ e and location of the failed connectivity
component. A corresp onding major or minor alarm is lo gged by the rep orting
MO, stimulating an alarm report.