Escalation To Manual Maintenance; Alarm Conditions - Nortel DMS-100 Series Maintenance Manual

1-70 Maintenance overview

Escalation to manual maintenance

When automatic maintenance fails to correct a fault in the DMS switch, the
DMS switch provides trouble indicators that reveal a fault condition still
exists. Alarms are examples of trouble indicators. Some OMs and logs also
indicate a fault condition and a failure of automatic maintenance. Manual
intervention becomes necessary as maintenance personnel attempt to clear
the fault at the MAP terminal. Refer to the chapter "Troubleshooting chart"
for a procedure on alarm clearing. Refer to the chapter "RLCM-EDC
related logs" for log information and to the chapter "RLCM-EDC related
operational measurements" for OM information.

Alarm conditions

The maintenance system status header on the MAP display screen indicates
alarm conditions for the DMS-100 switch subsystems. The alarm conditions
and their meanings are shown in the following table.
Alarm description
Alarm
Minor
Major
Critical
The alarm type is displayed under the header, along with the alarm severity.
If several alarms are occur, the most serious alarm is shown. When this
alarm is cleared, the next most serious alarm is displayed. When there is no
alarm condition, that is, when the PM system is fully in service, a dot (.) is
shown under the header PM.
The following table shows alarms related to the RLCM-EDC that appear
under the PM subsystem header of the MAP display.
297-8381-550 Standard 02.02 April 1999
MAP
Description
display
(blank) Usually non-service affecting
(M) Usually indicates a service-degrading, threatening
condition
(*C*) Usually indicates a service outage or potential
service outage