Demand test descriptions and error codes - Avaya Support

Blue Alarm Inquiry Test (#139)
Blue Alarm Inquiry Test (#139)
Note:
Note: The term "DS1 board" refers to the DS1 Interface circuit packs, the UDS1
Interface circuit packs, and the DS1 Interface Media Module.
A 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 a local DS1 board detects a Blue Alarm signal from the remote DS1 endpoint, it transmits
a Yellow Alarm to the remote DS1 endpoint and sends a BLUE ALARM message to the system.
When the Blue Alarm is confirmed, the system places all trunks or ports of the DS1 board into
the out-of-service state. The inquiry test runs every 10 minutes until the Blue Alarm is cleared.
When the Blue Alarm is cleared, the DS1 board stops transmitting the Yellow alarm and places
the trunks or ports back into the service state they were in before the Blue Alarm occurred
This test is run on the following maintenance objects:
● DS1-BD (DS1 Interface Circuit Pack)
● MAPD-BD (MAPD Interface Circuit Pack)
● MG-DS1 (DS1 Interface Media Module)
● UDS1-BD (UDS1 Interface Circuit Pack)
Line Loopback Alarm
The Line Loopback (LLB) is used by the remote DS1 endpoint to put the DS1 board into a
loopback mode. When the DS1 board is in the LLB mode, the arriving bit pattern is regenerated
and sent back. The Line Loopback (LLB) Alarm activates when the in-band activate LLB bit
pattern arrives continuously for 5 seconds on the DS1 line. The LLB deactivates when the
in-band deactivate LLB bit pattern arrives continuously for 5 seconds on the DS1 line.
Since LLB is a condition rendering all DS0 chels unavailable for signaling or bearer traffic, the
system 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. The PLB Alarm activates when a network protocol activate bit pattern arrives
over the 4Kbps ESF data link on the DS1 line. The PLB deactivates when a network protocol
deactivate bit pattern arrives over the 4Kbps ESF data link on the DS1 line.
Issue 5 May 2009 1245