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Managing Alarms
To silence the alarm, do one of the following:
•
Press the ACO pushbutton on the front panel of the HMU.
•
Press the external ACO pushbutton (if installed).
The following events occur:
•
The front panel ACO LED lights and remains lit until the original alarm is cleared or until another alarm
occurs.
•
The audio alarm relay circuits are disabled, causing any connected audio alarms to turn off.
HXU A
LARMS
The HXU reports Critical, Major, Minor and Far End alarms to the HMU.
•
CRITICAL: The HXU reports a critical alarm if it detects:
–
a critical service-affecting fault.
–
more than four faulty DS1 inputs or DS2 failure.
•
MAJOR: A major alarm is generated if the HXU detects:
–
up to four faulty DSX-1 lines.
–
one or more faulty DS1 inputs.
–
a major service-affecting fault.
•
MINOR: The HXU reports a minor alarm if it detects:
–
a potential service-affecting fault condition.
–
a DS3 Far-End alarm.
–
a low-speed loopback.
–
a DS3 loopback.
•
ABNORMAL: The HXU reports an Abnormal alarm if it detects:
–
DS3 Receive condition (AIS or Idle).
–
Power A or Power B alarm.
•
FAR END: The HXU reports a Far End alarm if the far end of the DS3 has an alarm.
66
July 14, 2002
LTPH-SM-1052-04
HMS-358 List 5 and List 6
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