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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-1465UDS1-BD (UDS1 Interface Circuit Pack)
10
transmitting the Yellow alarm and places the trunks or ports back into the service
state before the Blue alarm occurs.
Line Loopback Alarm
The Line Loopback (LLB) is used by the remote DS1 endpoint to put the switch
DS1 into a loopback mode. When the switch DS1 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.
Payload Loopback Alarm
The Payload Loopback (PLB) is used by the remote DS1 endpoint to put the
switch DS1 into a loopback mode. PLB Alarm is activated when a network
protocol activate bit pattern arrives over the 4Kbps ESF data link on the DS1 line.
PLB is deactivated when a network protocol deactivate bit pattern arrives over
the 4Kbps 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 10-495. TEST #139 Blue Alarm Inquiry Test
Error
Code
Test
Result Description/ Recommendation
ABORT Internal System Error
1. Retry the command at 1-minute intervals a maximum of 5 times.
2. If the test continues to abort, escalate the problem.
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