10 Trouble Isolation And Correction; Description Of Troubleshooting Procedures; Performance Indicators - Nortel DMS-100 Series Maintenance Manual

10 Trouble isolation and correction

Description of troubleshooting procedures

Basic troubleshooting procedures contain the following:
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Performance indicators

The first step in how to locate faults is to examine the performance indicators
the system generates on a regular basis. Operational measurements (OM), log
reports, and alarms indicate if fault conditions are present.
Operational measurements
The OMs are a data collecting system that tracks specified types of events and
the frequency these events occur. The OM data givex an indication of
performance and use. The OM data can detect actual and potential system
troubles. The OM thresholding feature can monitor and report key Outside
Plant Module (OPM) activity. The user must use this feature to compose these
reports daily or weekly. The user must use these reports as the primary method
of trouble detection. Refer to Operational Measurements Reference Manual
for more information OMs associated with the OPM.
Log reports
Logs, used as an analysis tool, provide detailed information on call errors,
diagnostic results, and system state. Logs can indicate trouble conditions
when the following conditions are present:
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how to locate and clear faults
fault isolation tests
diagnostic tests
product-specific test tools
sudden increase in volume of logs
message not printed reports
large number of similar logs
DMS-100 Family OPM Maintenance Manual XPM14 and up
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