Alarm Option For Digital Loop Carrier (Dlc) Feed; Retiring System Alarms - ADC HiGain H2TU-C-231 Manual

LTPH-TP-1034-01, Issue 1
Front-Panel
Alarm
(a)
Message
xxx-HBER HDSL2 Block Error Rate
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-231 enters the
acquiring mode, the front-panel status LED flashes red, and the ACQ or SIG message displays instead of the ALRM message.
(d) Does not activate the alarm relay access pins 20 and 21.

Alarm Option for Digital Loop Carrier (DLC) Feed

To improve HiGain HDSL2 compatibility with the switch-to-protect features used in DLC feeder applications, the
H2TU-C-231 has an Alarm Pattern (ALMP) option that allows you to select either an AIS or LOS DS1 output
payload for the following alarms:
•
LOSW on any loop
•
LOS DS1

Retiring System Alarms

To retire a system alarm, press the SEL pushbutton to execute an Alarm Cutoff (ACO). An ACO turns the alarm
off 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 4E
Table 21. Front-Panel System Alarms Summary (Continued)
Description
The HDSL2 BER has exceeded the set threshold
-6
limits of 10
TUR. If TUC and TUR occur at the same time,
then TUC displays.)
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.)
September 28, 2001
- 7
or 10 . (xxx denotes either TUC or
Testing
To Inhibit
Select NONE for the HBER
system option.
Set the Margin Alarm Threshold
option to 0 (zero).
Set the HDSL2 Loop Attenuation
Threshold option to zero.
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