Alarm Option For The Digital Loop Carrier Feed; Retiring System Alarms - ADC HiGain H2TU-C-231 List 3F User Manual

LTPH-UM-1149-01
Front-Panel
Alarm
(a)
Message
xxx-MAL Margin Alarm
xxx-LA Loop Attenuation
ALRM
(a) The message, , displays prior to any alarm message.
(b) Message displays repeatedly as long as the alarm condition exists and is not included in the priority order.
(c) When the HDSL2 loop loses sync word (LOSW), a system alarm condition exists. However, since the H2TU-C enters the
acquiring mode, the front-panel status LED flashes red, and the ACQ or SIG message displays instead of the

Alarm Option for the Digital Loop Carrier Feed

To improve HDSL2 compatibility with the switch-to-protect features used in Digital Loop Carrier (DLC) feeder
applications, the H2TU-C has an Alarm Pattern (ALMP) option that allows either AIS or LOS DS1 output payload
selection for the following alarms:
•
LOSW on any loop
•
LOS DS1

Retiring System Alarms

To retire a system alarm, press the LBK pushbutton to execute an Alarm Cutoff (ACO). An ALRM message has
two parts: the generated alarm and a generated alarm message. An ACO turns off the generated alarm and replaces
the ALRM message with an ACO message. The second part of the ALRM message, which defines the cause of the
alarm, remains. Both parts of the message remain until the alarm condition clears or another higher priority alarm
occurs.
H2TU-C-231 List 3F
Table 21. Front-Panel System Alarms Summary (Continued)
Description
The margin on the HDSL2 loop has dropped
below the minimum threshold value set for the
system. xxx denotes either TUC or TUR. If TUC
and TUR occur at the same time, then TUC
displays.
The attenuation on the HDSL2 loop has
exceeded the maximum value set for the HDSL2
loop attenuation threshold. xxx denotes either
TUC or TUR. If TUC and TUR occur at the same
time, then TUC displays.
June 12, 2002
Testing
To Inhibit
Set the Margin Alarm
Threshold option to 0
(zero).
Set the HDSL2 Loop
Attenuation Threshold
option to zero.
ALRM
message.
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