ATM-BCH (ATM B-Channel Trunk)
Issue 4 May 2002
10-195 555-233-123
B-channel alarms
The Maintenance/Far-End and Out-Of-Service/Far-End states generate warning
alarms displayed with status trunk grp#/mbr#.
Table 10-65. ATM ISDN service states
Category Description
Service states
In-Service (INS)
B-channel is in normal operating
state
Active A call is connected over
the B-channel.
Idle There is no call on the
B-channel.
Out-of-Service/Far-en
d (OOS/FE)
The switch has not successfully negotiated B-channel connection as of
yet. Calls cannot be placed or received.
When you first administer a B-channel, the switch initializes the B-channel
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-channel in the OOS/FE state.
Out-of-Service/Near-E
nd (OOS/NE)
The NPE Crosstalk Test has failed or the trunk is busied out. Calls cannot
be placed or received.
Maintenance/Far-End
(MTC/FE)
A request has timed out with no response from the far end after signaling
is in place and B-channels are in service. Calls can be received but not
placed, and stable calls are unaffected.
Maintenance/Near-En
d (MTC/NE)
The signaling channel (ISDN-LNK) has been busied out, possibly after a
test trunk grp#/mbr# long command. Calls cannot be placed or
received, but stable calls are unaffected.
Pending states
1
1 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).
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