Instruction manual

Networking and connectivity
555-233-767138 Issue 4 May 2003
Distributed Communications System
(DCS) protocol
The Distributed Communications System (DCS) protocol allows you to configure
two or more switches as if they were a single, large system. DCS provides
attendant and voice-terminal features between these switch locations. DCS
simplifies dialing procedures and allows transparent use of some of the
Communication Manager features. (Feature transparency means that features are
available to all users on DCS regardless of the switch location.) For more
information, also see ‘‘Centralized Attendant Service (CAS)’’ on page 48 and
‘‘Inter-PBX attendant calls’’ on page 45.
Attendant with DCS
Direct trunk group selection
See ‘‘Direct trunk group selection’’ on page 44.
Display
See ‘‘Display’’ on page 48.
DCS automatic circuit assurance
See ‘‘DCS automatic circuit assurance’’ on page 190.
DCS over ISDN-PRI D-channel (DCS+)
Enhances DCS by allowing access to the public network for DCS connections
between DCS switch nodes. With this feature (also known as DCS Plus or DCS+),
DCS features are no longer restricted to private facilities. The ISDN-PRI
B-channel is used for voice communications, and the ISDN-PRI D-channel is
used to transport DCS control information.
DCS protocol — Italy
See ‘‘Distributed Communications Systems (DCS) protocol’’ on page 99.
DCS with reroute
Allows a DCS call to be rerouted over a different path if the switch finds a better
quality and lower cost route. This feature allows for rerouting the call after a
transfer or rerouting during a call. DCS with reroute is similar to the rerouting
capabilities used with QSIG.