Lucent Technologies 555-661-150 manual PRI Facilities Switch Type, Planning Guidelines

MERLIN LEGEND Communications System Release 6.1		Issue 1
Network Reference 555-661-150		August 1998
5 Network Management
	Tandem PRI Facilities	Page 5-23
	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.