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

Trouble isolation and correction

Description of troubleshooting procedures

Basic troubleshooting procedures consist of the following:

Performance indicators

To locate a fault, examine the performance indicators the system normally
generates. Operational measurements (OM), log reports, and alarms indicate
fault conditions.
Operational measurements
The OMs are systems that collect data and track the frequency of certain
events. The OM data provides a summary of use and performance. The
OMs detect present and future system troubles. The OMs threshold feature
allows the system to monitor and report key Remote Line Concentrating
Module (RLCM) activity. The primary method of trouble detection consists
of daily and weekly reports. Refer to Extended Peripheral Modules
Operational Measurements Reference Manual for additional information
about the OMs specified to the RLCM.
Log reports
Logs are analysis tools and provide information on call errors, diagnostic
results, and system status. Logs are also good indicators of trouble
conditions when any of the following conditions are present:
location and clearance of faults
fault isolation tests
diagnostic tests
product-specific test tools
sudden increase in volume of logs
message not printed reports
large number of logs
DMS-100 Family RLCM Maintenance Manual XPM12 and up
10-1