Locating And Clearing Faults - Nortel DMS-100 Series Maintenance Manual

10-2 Trouble isolation and correction
Alarms
Audible and visual alarms indicate that correcting action is required.
Correct performance of normal system maintenance and use of OMs and
logs can decrease the occurrence of alarms.
The level of the alarm indicates alarm severity and priority for correcting
action. The level of the alarm can be minor, major, or critical. Alarm
conditions appear in the following table.
Alarm description
Alarm
Minor
Major
Critical
Follow the following guidelines when you respond to alarms:
For procedures to clear alarms, refer to Alarm Clearing Procedures.

Locating and clearing faults

The standard troubleshooting steps to locate and clear alarms follow:
1 Silence audible alarms the system causes when the system detects alarm
2 Read status displays and trace fault codes to the menu level needed to
3 Busy the hardware to eliminate system access to the defective
4 Test the defective component. Identify the card to replace. Replace the
5 Return the hardware to service.
297-8211-550 Standard 05.01 August 1999
MAP display
(blank)
M
*C*
When more than one alarm of the same severity appears on the MAP
display, clear the alarms. Clear the alarms from the left of the screen to
the right.
If an alarm of greater severity occurs while you fix an alarm, respond to
the new alarm. Do not continue attempts to clear the less severe alarm.
conditions.
isolate and clear the fault.
component. When you busy the hardware, maintenance activity occurs
without system interference.
defective card. Test the card again.
Description
Normally does not affect service
Normally indicates a condition that degrades
service
Normally indicates a service outage or
potential service outage