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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Network Management
Page 5-23Tandem PRI Facilities
5
PRI Facilities Switch Type 5
In this procedure, two additional switch types allow you to specify additional
switch options in order to set up a PRI tandem trunk that connects two MERLIN
LEGEND Communications Systems or a MERLIN LEGEND Communications
System and a DEFINITY ECS or DEFINITY ProLogix Solutions system. The two
additional options are the following:
■ MERLIN LEGEND Communications System Networked: LEGEND-Ntwk
■ MERLIN LEGEND Communications System PBX: LEGEND-PBX
Planning Guidelines 5
To set up a PRI tandem trunk, one system is specified as operating in PBX mode
and the other as operating in network mode. When you program this switch type,
you specify the type of switch at the
other
end of the PRI trunk, not the local
switch. The slot number that you enter is the slot number on the local system.
In Release 6.1 and later systems, the PRI Switch Type Test requests the system
at the other end to respond with information about the PRI Switch Type
specification. Lucent Technologies technicians or authorized representatives can
run this test to determine the PRI Switch Type at the other end.
The following rules apply to PRI tandem trunks in PBX or network mode:
■ A single unused B-channel group number is automatically assigned to all
23 B-channels on the trunk; B-channels on the same module may be
removed or added manually at a later time. The system finds an
unassigned group number by starting at group 80 and searching backward.
This group can exist, even if all B-channels are removed manually. For
more information, see “B-Channel Groups” in the “PRI Facilities” section of
System Programming
.
■ PRI dial-plan routing does not apply for incoming calls on the PRI tandem
trunk. Incoming routing is automatically set to Route Directly to UDP for
B-channels in the automatically assigned group; this cannot be changed as
long as the LEGEND-PBX or LEGEND-Ntwk switch type is in effect. For
more information, see “Incoming Call Routing” in the “PRI Facilities”
section of
System Programming
.
■ PRI outgoing call tables do not apply to outgoing calls on the PRI tandem
trunk.
■ The system automatically assigns Electronic Tandem Network (ETN) as
the network service for the B-channel group that is automatically assigned
to the PRI tandem trunk; this setting cannot be changed as long as the
switch type is in effect. For more information, see “Network Service” in the
“PRI Facilities” section of
System Programming
.