Demand test descriptions and error codes - Avaya Support

ISDN-TRK (DS1 ISDN Trunk)
The following diagram of the DS1 ISDN Trunk service states shows the common progression
from one service state to another and the event that caused the change of state.
Figure 35: Common Progressions in Service States
Craft release of
B-channel or
clearing of near-end
problem with
DS1-BD, PI-BD,
PI-LINK or port.
Administer
B-channel
as member
of a trunk
group.
If D-channel controlling
the B-channel is
up, send a message
requesting transition
to In-Service.
Out-of-
Service
Near End
Out-of-
Service
Far End
Out-of-
Service
Far End
Pending
In-Service
Craft busyout of B-channel
(TRK-GRP/MBR), or problem
with near en d PI-LINK, DS1-BD,
PI-BD, or port.
Received indication
from far end that
B-channel in/not
in service.
Failed to receive
reply from far
end. MTCE will
periodically try
to resend the
message.
Received
acknowledgement
or other
indication from the
far end that
B-channel is in service.
Craft busyout of signaling link
busyout link LINK-NO or
transient state for demand
long test of the trunk.
In-Service
Failed to receive
reply from far end.
MTCE will periodically
try to resend the
message. [country
protocol other than 1]
D-channel has
been down for at
least 90 seconds,
or Remote Level 3
Query failed.
Failed to receive
reply from far end.
MTCE will periodically
try to resend the
message. [Country
protocol 1]
Received
acknowledgement
or other indication
from the far end,
that B-channel is
inservice.
Maintenance
Near End
Maintenance
Far End
Maintenance
Far End
Pending
In-Service
Craft release
of signaling
link, or craft
demanded test
completed.
If D-channel
controlling the
B-channel is
up, send a
message
requesting
transition to
In-Service.
Issue 5 May 2009 561