AT&T MERLIN LEGEND Release 3.1 Maintenance And Troubleshooting Manual page 43

Maintenance Strategy
Trouble Reports
System trouble can be reported in two ways:
By users
By system alarms (permanent errors)
Automatic Tests
The system performs ongoing maintenance automatically by running tests
that:
Monitor the status of equipment.
Audit operations consistency.
Detect hardware malfunctions.
Without disrupting normal service, the tests check hardware and software that
are in service. The system registers any errors it detects in the error logs and
corrects them automatically, if possible.
Alarms
If the automatic tests indicate serious error conditions, the system generates
an alarm. Depending on how the system is programmed, the system
announces an alarm condition in one of the following ways:
An LED for a line or feature button turns on at an operator console or
other designated telephone.
The red status LED on the processor module lights.
In Release 3.0 and later, the error code/status display on the
processor module displays
See "System Restart" for details about frigid start (System Erase) or
cold start (Restart).
if a frigid start, or if a cold start occurs.
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Introduction