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

10-2 Trouble isolation and correction
Alarms
Audible and visual alarms require action to correct the problem. Correct
performance of routine system maintenance and use of OMs and logs
minimizes the occurrence of alarms.
The level of alarm indicates how severe the alarm is and the associated
emergency to correct the action. The level of alarm can be minor, major, or
critical. The following table describes alarm conditions.
Table 10-1 Alarm description
Alarm
Minor
Major
Critical
The user must follow the following guidelines when the user responds to
alarms:
•
•
For alarm clearing procedures, refer to Alarm Clearing Procedures.

Locating and clearing faults

The standard troubleshooting steps for how to locate and clear faults appear in
the following list:
1
2
3
4
5
297-8361-550 Standard 04.01 September 2000
MAP display
(blank)
(M)
(*C*)
When more than one severe alarm appears on the MAP display screen,
clear the alarms. Clear the alarms from the left to the right of the screen.
If a very severe alarm occurs when the user fixes an alarm, respond to the
new alarm. Do not continue attempts to clear the less severe alarm.
The system causes Silence audible alarms when the system detects alarm
conditions.
Read status displays and trace fault codes to the menu level needed to clear
the fault to isolate the fault.
Busy the hardware to remove the system access to the defective component.
When you busy the hardware, maintenance activity can occur without system
interference.
Test the defective component. Identify the card you must replace. Replace
the defective card and test the card again.
Return the hardware to service.
Description
Normally does not affect service
Normally indicates a condition that degrades
service
Normally indicates a service outage or potential
service outage