DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-573DS1-BD (DS1 Interface Circuit Pack)
3
Line Loopback Alarm
The Line Loopback (LLB) is used by the remote DS1 endpoint to put the IC SU or
DS1 into a loopback mode. When the ICSU or DS1 Board is in the LLB mo de, the
arriving bit pattern is regenerated and sent b ack. Line Loopbac k (LLB) Alarm is
activated when the in-ban d activate LLB bit p attern has been arriving
continuously for 5 seconds on the DS1 line. LLB is d eactivated when the in-b and
deactivate LLB bit p attern has been arriving c ontinuously for 5 seconds on t he
DS1 line.
Since LLB is a maintenance cond ition rendering all DS0 channels unava ilable for
signaling or bearer traffic , maintenance software treats this the same as a Blue
Alarm.
Payload Loopback Alarm
The Payload Loopback (PLB) is used b y the remote DS1 endpoint to put the
switch DS1 into a loopbac k mode. PLB Alarm is activated when a network
protocol activate b it pattern arrives over the 4-Kbp s ESF data link on the DS1
line. PLB is deactivated when a network p rotocol deactivate b it pattern arrives
over the 4-Kbps ESF data link on the DS1 line.
Since PLB is a maintenance condition rend ering all DS0 channels unavailable for
signaling or bearer traffic , maintenance software treats this the same as a Blue
Alarm.