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Communication Manager Maintenance-Object Repair Procedures
2418 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
Blue Alarm Inquiry Test (#139)
The Blue alarm is a signal sent by the remote DS1 endpoint when it is out-of-service. The Blue
Alarm Inquiry test checks the blue alarm status of the remote DS1 endpoint.
When the UDS1 Interface circuit pack detects a Blue Alarm signal from the remote DS1
endpoint, the circuit pack transmits a Yellow alarm to the remote DS1 endpoint and sends a
BLUE ALARM message to the maintenance software. When the Blue alarm is confirmed, the
maintenance software places every trunk or port of the UDS1 Interface circuit pack into the
out-of-service state. The inquiry test runs every 10 minutes until the Blue alarm is cleared.
The UDS1 Interface circuit pack takes one second to recognize and report a Blue alarm and 16
seconds to recognize and report the resolution of a Blue alarm. When the Blue alarm is cleared,
the UDS1 Interface circuit pack stops transmitting the Yellow alarm and places the trunks or
ports back into the service state they were in before the Blue alarm occurred.
Line Loop-Back Alarm
The LLB (Line Loopback) is used by the remote UDS1 endpoint to put the ICSU or UDS1 board
into a loop-back mode. When the ICSU or UDS1 board is in the LLB mode, the arriving bit
pattern is regenerated and sent back. The LLB Alarm activates when the in-band activated LLB
bit pattern arrives continuously for 5 seconds on the DS1 line. The LLB deactivates when the
in-band deactivated LLB bit pattern arrives continuously for 5 seconds on the DS1 line.
Because LLB is a maintenance condition rendering every DS0 channel unavailable for signaling
or bearer traffic, maintenance software treats this the same as a Blue Alarm.
Payload Loopback Alarm
The PLB (Payload Loopback) is used by the remote UDS1 endpoint to put the switch UDS1 into
a loop-back mode. The PLB Alarm activates when a network protocol activated bit pattern
arrives over the 4-kbps ESF data link on the DS1 line. The PLB deactivates when a network
protocol deactivated bit pattern arrives over the 4-kbps ESF data link on the DS1 line.
Because PLB is a maintenance condition rendering every DS0 channel unavailable for
signaling or bearer traffic, maintenance software treats this the same as a Blue Alarm.
Table 859: Test #139 Blue Alarm Inquiry Test
Error
Code
Test
Result
Description / Recommendation
ABRT Internal system error
1. Retry the command at 1-minute intervals up to 5 times.
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