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Managing Alarms
The line unit H1ES, H2ES, and DS1 Errored Seconds Threshold alarms are not supported by the
Shelf Status menu. If any of these conditions exist on a line unit, the line unit status indicates
NORMAL. For this reason, use of the line unit Errored Seconds Threshold alarm option is not
recommended. Refer to the line unit documentation for instructions on setting the Errored Seconds
Threshold option.
Alarm Message
LOSW
RLOS
LLOS
MAL1, MAL2
NORMAL
UNKNOWN
Enable the ALM (alarm) option of an unmanaged line unit to allow the unit to trigger an alarm on
pin H of the shelf connector (the LOS Alarm Bus). A managed HLU initiates an HMU alarm message
over the digital management bus between the HLU and HMU. An unmanaged HLU or a T1 repeater
triggers the HMU alarm by driving the LOS Alarm Bus to ground. Refer to the line unit's
documentation for instructions on enabling the ALM option.
74
Table 10. Line Unit Alarm Messages
Definition
Loss Of Sync Word
Remote Loss Of Signal
Local Loss Of Signal
Margin Alarm 1, Margin Alarm 2
September 29, 2000
800-357-104-01, Revision 01
Description
Loss of signal on an HDSL span.
Loss of DS1 signal at the remote unit.
Loss of DSX-1 signal at the line unit.
Loop margin has dropped below the user-set,
minimum threshold level.
No alarm condition exists.
Line unit failed to respond to status requests.
HMS-357 List 4 and List 5
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