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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.
•
MAJOR: A major alarm is generated if the HXU detects:
–
up to four faulty DSX-1 lines.
–
more than five 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).
–
DS1 transmit LOS condition.
–
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.
L
U
A
INE
NIT
LARMS
The Shelf Status menu reports the alarm status for each line unit. This includes both physical alarms (LOS
ALARM BUS and FUSE ALARM BUS) as well as alarm messages shown in
The LOS ALARM BUS field on the Shelf Status menu indicates when any unmanaged line unit (or any other
non-manageable card installed in the shelf) is reporting a minor alarm on pin H of the line unit edge connector.
Refer to the shelf and line unit technical practices for information on using pin H.
80
January 12, 2001
LTPH-SM-1014-03, Issue 3
Table
10.
HMS-358 List 1 and List 2
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