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LTPH-UM-1109-01, Issue 1 Testing
H2TU-C-231 List 2 January 9, 2002 41
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 ofthe alarm, remains. Both parts of the message remain until the alarm condition clears or another higher
priority alarm occurs.
xxx-DBER DS1 Bit Error Rate The DS1 BER has exceeded the set
threshold limits of approximately 10
-6
.
(xxx denotes either TUC or TUR. If TUC
and TUR occur at the same time, then TUC
displays.)
Select DIS for the DBER system option.
LOF Loss of Frame The DS1 input does not contain the ESF or
SF frame pattern setting of the FRMG
option.
Change FRMG option to AUTO or UNFR.
PRMF Performance Report
Messaging - Far End
Indicates H2TU-R PRM-FE BER threshold
is exceeded.
Set DBER threshold to DIS.
PRMN Performance Report
Messaging - Near End
Indicates H2TU-R PRM-NE BER threshold
is exceeded.
Set DBER threshold to DIS.
xxx-HBER
(c)
HDSL2 Block Error
Rate
The HDSL2 BER has exceeded the set
threshold limits of 10
-6
or 10
- 7
. (xxx
denotes either TUC or TUR. If TUC and
TUR occur at the same time, then TUC
displays.)
Select NONE for the HBER system option.
xxx-MAL
(c)
Margin Alarm 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.)
Set the Margin Alarm Threshold option to
0 (zero).
xxx-LA
(c)
Loop Attenuation 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.)
Set the HDSL2 Loop Attenuation
Threshold option to 0 (zero).
(a) The message, ALRM, 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) Only these alarms assert the System Alarm bus on pins 20 and 21 of the card-edge connector if the ALM option is enabled.
(d) 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.
Table 15. Front-Panel System Alarms Summary (Continued)
Front-Panel
Message
(a)
Alarm Description To Inhibit