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MERLIN LEGEND Communications System Release 6.0
System Programming
555-660-111
Issue 1
February 1998
Programming Procedures
Page 4-172PRI Facilities
4
B-Channel Groups 4
Use this procedure to perform the following:
■ Assign B-channels to a group.
■ Associate individual ISDN channels (that can place and receive calls) on
the B-channels in each group.
B-channels are partitioned into trunk groups when PRI service is ordered. The
trunk groups defined when service is ordered must match the B-channel groups
defined when the MERLIN LEGEND Communications System is programmed.
NOTE:NOTE:NOTE:
In Release 6.0 and later systems, when the PRI switch type is set to
Legend-PBX or Legend-NTWK, all B-channels for a PRI tandem trunk are
automatically assigned to a single unused B-channel group. If your private
network includes drop-and-insert hardware between the networked
switches, use this procedure to remove a dropped B-channel from the
group, after the switch type has been programmed and the B-channels
automatically assigned. This equipment must never drop channel 24, which
provides necessary signalling for the B-channels.
Each B-channel can be assigned to only one group, and each ISDN channel can
be associated with only one group. Up to 80 B-channel groups can be
established.
Each group can contain up to 23 channels; however, all channels assigned must
signal through the same D-channel (that is, must be connected to the same 100D
module).
B-channels must be assigned in the order of system search (through the group)
for an available channel. To minimize call attempts on the same line or trunk,
arrange B-channels in the opposite order of the hunting arrangement provided by
the network service provider.
B-channels must be identified by control unit slot and port numbers since they are
not associated with a line/trunk number or a logical ID.
PRI B-channel groups programmed for line routing perform similarly to loop-start
trunks. PRI B-channel groups programmed for dial plan routing perform similarly
to DID trunks.
NOTE:NOTE:NOTE:
If more lines than B-channels are assigned to a B-channel group, users
may experience situations where a line that is idle is not able to seize a
B-channel. The user receives a fast busy tone.