Avaya S8700 Series, Руководство по обслуживанию

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PN-SNTY (PN Sanity Audit)
Issue 1 May 2002 8-741 555-233-143
PN-SNTY (PN Sanity Audit)
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:
‘‘TDM-BUS (TDM Bus)’’ , ‘‘EXP-INTF (Expansion
Interface Circuit Pack)’’ , ‘‘TDM-CLK (TDM Bus Clock)’’ , ‘‘EXP-PN
(Expansion Port Network)’’ , and ‘‘PNC-DUP (PNC Duplication)’’ . You
should refer to these maintenance sections during troubleshooting
operations.
MO’s Name (in
Alarm Log) Alarm
Level Initial Command to
Run
Full Name of MO
EPN-SNTY None None EPN Sanity Audit