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LTPH-SM-1014-03, Issue 3
The FUSE ALARM BUS field on the Shelf Status menu indicates when any line unit (or any other card installed
in the shelf) is reporting a fuse alarm on pin 10 of the line unit edge connector. Refer to the shelf and line unit
technical practices for information on pin 10.
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.
HMS-358 List 1 and List 2
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
January 12, 2001
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.
Managing Alarms
81
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