Pn-Snty (Pn Sanity Audit) - Avaya S8700 Maintenance Manual

PN-SNTY (PN Sanity Audit)

PN-SNTY (PN Sanity Audit)
MO's Name (in
Alarm Log)
EPN-SNTY
The EPN Sanity Audit feature enhances the system's ability to recover from failure
conditions that disable an entire PN. In such situations, not only is the affected
PN unable to provide service to the system, but the system itself has not detected
the condition. The EPN Sanity Audit feature recognizes an PN as unable to
provide service when the software cannot receive control messages from PN
circuit packs. When such a failure is detected by the EPN Sanity Audit, a
sequence of recovery actions is triggered to restore the PN to service.
For a duplex-, high-, or critical-reliability system (duplicated media server), the
recovery sequence is:
1. TDM bus switch
2. Tone-Clock switch within the PN
3. PNC interchange
4. PN WARM reset
5. PN COLD reset
The EPN Sanity Audit feature activates only when every existing maintenance
operation has failed to detect the PN problem. The EPN Sanity Audit serves as a
safety net for the PN.
NOTE:
It is not clear why certain types of PN problems activate this feature. Thus,
error log entries related to these problems do not specify which hardware to
replace. The error log entries only indicate that some drastic recovery
action occurred due to an unknown problem. However, clues as to the root
cause of the PN outage may be present in the Error Logs and the Alarm
Logs of the following MOs:
Interface Circuit
(Expansion Port
should refer to these maintenance sections during troubleshooting
operations.
555-233-143
Alarm Initial Command to
Level Run
None None
''TDM-BUS (TDM
Pack)'', ''TDM-CLK (TDM Bus
Network)'', and ''PNC-DUP (PNC
Full Name of MO
EPN Sanity Audit
Bus)'', ''EXP-INTF (Expansion
Clock)'', ''EXP-PN
Duplication)''. You
Issue 1 May 2002 8-741