DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-760EPN-SNTY (EPN Sanity Audit)
9
EPN-SNTY (EPN Sanity Audit)
The EPN Sanity Audit feature enhances the system’s ability to recover from failure
conditions that disable an entire EPN. In such situations, not only is the affected
EPN unable to provide service to the system, but the system itself has not
detected the condition. The EPN Sanity Audit feature recognizes an EPN as
unable to provide service when the software cannot receive control messages
from EPN circuit packs. When such a failure is detected by the EPN Sanity Audit,
a sequence of recovery actions is triggered to restore the EPN to service.
For a Standard Reliability system (simplex SPE), the recovery sequence is:
1. TDM Bus Switch
2. EPN WARM Reset
3. EPN COLD Reset
For a High or Critical Reliability system (duplicated SPE), the recovery sequence
is:
1. TDM Bus Switch
2. Tone/Clock Switch within the EPN
3. PNC Interchange
4. EPN WARM Reset
5. EPN COLD Reset
The EPN Sanity Audit feature activates only when all existing maintenance
operations have failed to detect the EPN problem. The EPN Sanity Audit serves
as a safety net for the EPN.
NOTE:
It is not clear why certain types of EPN 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 EPN outage may be present in the Error Logs and the Alarm
Logs of the following MOs: Switch Control (SW-CTL), TDM Bus (TDM-BUS),
Expansion Interface (EXP-INTF), TDM Bus Clock (TDM-CLK), EXP-PN, and
PNC-DUP. You should refer to these maintenance sections during
troubleshooting operations.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run Full Name of MO
EPN-SNTY None None EPN Sanity Audit
