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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Troubleshooting
6-45Troubleshooting ATM-PNC
6
network occurs. In such cases, SVC setups requested by DEFINITY can be
denied by the ATM network and associated components, and calls are not
completed.
In this section, a failed SVC setup means that the ATM network has actively
rejected the request. A delayed SVC setup means that the SVC setup exceeded
a time threshold, specified in milliseconds (ms).
Performance indicators of both failed and delayed SVC setups:
■ The called party may hear ringing, take the receiver off-hook, and hear
nothing. The called party may eventually receive a delayed call, but never
receives a failed call.
■ If the call was delayed, the calling party hears silence if one of the SVCs is
not up or hears the called party if it is up.
■ If the call is never completed, the caller eventually hangs up without
knowing why the call was not completed.
Therefore, SVC failures that occur more often than normal are most often
evidence of an ATM network that is out of specification.
The tools to manage the DEFINITY ECS switch and the ATM network are
■ Alarming out-of-spec conditions
■ SVC latency commands
■ Administration thresholds to either allow or deny completion of calls that
require a new SVC over a path that recently experienced a high number of
delayed or failed SVCs.
Alarming out-of-spec conditions
Out-of-spec conditions in the ATM network are reported against the ATM-NTWK
maintenance object in the Alarm Report and the Hardware Error Report (
display
errors
). Refer to one of the following books for an example of a Hardware Error
Report with an ATM-NTWK alarm:
■ DEFINITY Enterprise Communications Server Release 8 Maintenance for
R8r
■ DEFINITY Enterprise Communications Server Release 8 Maintenance for
R8si
■ DEFINITY Enterprise Communications Server Release 8 Maintenance for
R8csi