MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting
555-661-140
Issue 1
August 1998
Page 1-23
Maintenance Strategy
■ By system alarms (permanent errors)
Automatic Tests
The system performs ongoing maintenance automatically by running tests that
do the following:
■ 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, if
possible, corrects them automatically.
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
) if a frigid start, or & if a cold start, occurs. See
“System Restarts” on page 1–24 for details about frigid start (System
Erase) or cold start (Restart).
If a software installation or upgrade is taking place, a blinking character
is displayed to indicate the status of the procedure. See “Forced
Installation/Upgrade of System Software” on page 4–19 for more
information.
■ The status display indicates an alarm (on an MLX-20L console or a PC
running SPM), and can be viewed on the Error screen.
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