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Main/Satellite/Tributary
Issue 5 January 1998
12-17555-230-024
If a DEFINITY ECS is a node within a Distributed Communication System and
Centralized Attendant Service is provided, a centralized attendant can do the fol-
lowing:
■ Control access to specific trunks at other nodes
■ Directly access to specific trunks at another location
■ Place test calls to telephones and trunk groups at other nodes
■ Receive a visual warning that all trunks in a remote trunk group are busy or
that the number of busy trunks in a remote group has reached a specified
level
This feature ensures that all calls directed to an attendant at your company are
handled efficiently.
Main/Satellite/Tributary
If you have modest network requirements, a main/satellite/tributary configuration
is an attractive possibility for private networking. In this configuration, one DEFIN-
ITY ECS location is the main, and remote switches are satellites or tributaries.
Attendant positions and public network facilities are usually concentrated at the
main.
All calls to or from a satellite pass through the switch at the main. The system
appears to be a single switch with one listed directory number. A uniform dial
plan provides a common four-digit or five-digit dial plan for a main/satellite con-
figuration.
A tributary is similar to a satellite, but it has one or more attendant positions and
its own listed directory number. Calls to its listed directory number go directly to
the tributary.
The switches in a main/satellite/tributary network are connected by tie trunks.
Trunks and switching facilities can be added as requirements grow.
An important DEFINITY ECS networking feature is Main/Satellite Extended Trunk
Access. Extended Trunk Access allows dialed digits that are undefined at a sat-
ellite or tributary switch to be routed over a trunk group to a main switch for inter-
pretation. This means changes to the network numbering plan do not have to be
propagated to all switches. Extended Trunk Access improves your control and
reduces administration costs by making trunk networks considerably easier to
maintain.