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

Trouble isolation and correction

Description of troubleshooting procedures

This trouble isolation and correction section is for the use of maintenance
engineering and field maintenance personnel. These users must possess a
basic knowledge of the DMS-100 Family of switches and the Remote Line
Concentrating Module with Extended Distance capability (RLCM-EDC).
Operating company personnel require step-by-step procedures to perform
maintenance tasks must not use this section.
Basic troubleshooting procedures consist of the following:

Performance indicators

To locate a fault, check the performance indicators the system normally
generates. Operational measurements (OM), log reports, and alarms indicate
error 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 OM threshold feature
allows the system to monitor and report key Remote Line Concentrating
Module with Extended Distance Capability (RLCM-EDC) activity. The
primary method of trouble detection consists of daily and weekly reports.
Refer to Operational Measurements Reference Manual for additional
information about the OMs specified to the RLCM-EDC.
location and clearance of faults
fault isolation tests
diagnostic tests
product-specific test tools
DMS-100 Family Maintenance Manual ABSK007
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