Avaya 03-300430 User Manual

For blue alarms, a DS1 Interface circuit pack takes much longer to recognize and report its 
resolution (~ 16 seconds) than its occurrence (~ 2 seconds). So, when a blue alarm is cleared, 
the local DS1 Interface circuit pack avoids false blue alarms by quickly:

●

Restoring the DS1 trunks to service

●

Discontinuing yellow alarms to the remote endpoint

before the remote endpoint can recognize and report another blue alarm.

The Line Loopback (LLB) is used by the remote DS1 endpoint to put the ICSU or DS1 into a 
loop-back mode. When the ICSU or DS1 Board is in the LLB mode, the arriving bit pattern is 
regenerated and sent back. Line Loopback (LLB) Alarm is activated when the in-band activate 
LLB bit pattern has been arriving continuously for 5 seconds on the DS1 line. LLB is deactivated 
when the in-band deactivate LLB bit pattern has been arriving continuously for 5 seconds on the 
DS1 line.
Since LLB is a maintenance condition rendering all DS0 channels unavailable for signaling or 
bearer traffic, maintenance software treats this the same as a Blue Alarm.

The Payload Loopback (PLB) is used by the remote DS1 endpoint to put the switch DS1 into a 
loop-back mode. PLB Alarm is activated when a network protocol activate bit pattern arrives 
over the 4-kbps ESF data link on the DS1 line. PLB is deactivated when a network protocol 
deactivate bit pattern arrives over the 4-kbps ESF data link on the DS1 line.
Since PLB is a maintenance condition rendering all DS0 channels unavailable for signaling or 
bearer traffic, maintenance software treats this the same as a Blue Alarm.

ABRT

Internal system error

 2100

ABRT

Could not allocate the necessary system resources to run this test.

1. Retry the command at 1-minute intervals up to 5 times.

 1 of 3