Alarm Option For Dlc Feed; Retiring System Alarms - ADC HiGain H2TU-C-388 User Manual

152-388-100-02, Issue 2
Front-Panel
Alarm
(a)
Message
LOF Loss of Frame
PRMF Performance Report
Messaging - Far End
PRMN Performance Report
Messaging - Near End
(c)
xxxx-HBER HDSL2 Block Error
Rate
(c)
xxxx-MAL Margin Alarm
(c)
xxxx-LA Loop Attenuation
(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-388 enters the
acquiring mode, the front-panel status LED flashes red, and the ACQ or SIG message displays instead of the ALRM message.

Alarm Option for DLC Feed

To improve HiGain compatibility with the switch-to-protect features used in DLC feeder applications, the
H2TU-C-388 List 1 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 button 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-388 List 1
Table 14. Front-Panel System Alarms Summary (Continued)
Description
The DS1 input does not contain the ESF or
SF frame pattern setting of the FRMG
option.
Indicates H2TU-R PRM-FE BER threshold
is exceeded.
Indicates H2TU-R PRM-NE BER threshold
is exceeded.
The HDSL2 BER has exceeded the set
threshold limits of 10
denotes either TUC or 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. (xxxx 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. (xxxx
denotes either TUC or TUR. If TUC and
TUR occur at the same time, then TUC
displays.)
To Inhibit
Change FRMG option to AUTO or UNFR.
Set DBER threshold to DIS.
Set DBER threshold to DIS.
Select NONE for the HBER system option.
-6 - 7
or 10 . (xxxx
Set the Margin Alarm Threshold option to
0 (zero).
Set the HDSL2 Loop Attenuation
Threshold option to zero.
June 6, 2000
Testing
37