Demand test descriptions and error codes - Avaya Support

Communication Manager Maintenance Object Repair Procedures
B-Chel Service States
The ISDN specification defines two service state categories for B-Chels as listed in ATM ISDN
service states.
Table 28: ATM ISDN service states
Category Description
Service states
In-Service (INS) B-Chel is in normal operating
state
Out-of-Service/
Far-End (OOS/FE)
Out-of-Service/
Near-End (OOS/NE)
Maintenance/
Far-End (MTC/FE)
Maintenance/
Near-End (MTC/NE)
Active A call is connected over
the B-Chel.
Idle There is no call on the
B chel.
The switch has not successfully negotiated B-Chel connection as of
yet. Calls cot be placed or received.
When you first administer a B-Chel, the switch initializes the B chel to
this state while it tries to negotiate a connection to the far end. If the
request times out with no response from the far end, the switch leaves
the B-Chel in the OOS/FE state.
The NPE Crosstalk test has failed, or the trunk is busied out. Calls cot
be placed or received.
A request has timed out with no response from the far end after
signaling is in place and B-Chels are in service. Calls can be received
but not placed, and stable calls are unaffected.
The signaling chel ISDN-PLK has been busied out, possibly after
test trunk grp#/mem# long. Calls cot be placed or received, but
stable calls are unaffected.
Pending states The switch is waiting for a reply from the far end. Pending service
states remain in effect until the near end receives a response or times
out.
Pending-in-Service The near end is waiting for a response to a transition-to-service
request.
Pending-
Maintenance
The near end is waiting for a transition-to-maintenance-service
request (US and other country-protocol-1 systems).
116 Maintenance Alarms for Communication Manager, Media Gateways and Servers