DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127 Issue 1
August 1997
Maintenance Object Repair Procedures
Page10-499DS1-BD (DS1 Interface Circuit Pack)
10
Line Loopback Alarm
The Line Loopback (LLB) is used by the remote DS1 endpoint to put the ICSU or
DS1 into a loopback mode. When the ICSU or DS1 Board is in the LLB mode, the
arriving bit pattern is regenerated and sent back. Line Loopback (LLB) A larm 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 unav ailable for
signaling or bearer traffic, maintenance software treats this the same as a Blue
Alarm.
Payload Loopback Alarm
The Payload Loopback (PLB) is used by the remote DS1 e ndpoint to put the
switch DS1 into a loopback 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
Table 10-166. TEST #139 Blue Alarm Inquiry Test
Error
Code Test
Result Description/ Recommendation
ABORT Internal system error
2100 ABORT Could not allocate the necessary system resources to run this test.
1. Retry the command at 1-minute intervals a maximum of 5 times.
Continued on next page