System Alarms; Major Alarms - Nortel Meridian 1 General Maintenance Information

System alarms

Major alarms

System alarms are based on various fault monitors and indicators. The
category of the alarm—major, minor, or remote—indicates the severity of the
system failure:
• A major alarm requires immediate action by the technician.
• A minor alarm requires attention, but not necessarily immediate
attention, by the technician.
• A remote alarm may require attention by the technician.
A major alarm indicates a fault that seriously interferes with call processing.
The following faults cause a major alarm:
• CPU or control bus failure
• disk system failure when attempting to load the system
• system power failure (without reserve power)
• temperature fault (excessive heat)
When there is a major alarm, the red LED at the top of the affected column
lights. A major alarm also activates a display on all attendant consoles.
When a Meridian 1 is equipped with a power failure transfer unit, a major
alarm causes designated 500/2500 telephones to connect directly to Central
Office trunks; this is called a line transfer.
Hardware maintenance tools
Meridian 1 General Maintenance Information
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