Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6

Overview

555-231-208

Issue 1

April 2000

Networking Solutions

9-15Electronic Tandem Network

In an Electronic Tandem Network, the system provides a variety of features on a

network-wide basis. Here are a few examples:

■ Uniform Dial Plan — A unique four- or five-digit number assigned to each

station on the network. Uniform numbering gives each station a unique

number (location code plus extension) that can be used at any location in

the Electronic Tandem Network. To access that station, the system

enhances the standard uniform dial plan with the unrestricted five-digit

uniform dial plan, which allows up to five digits to be parsed for call routing.

■ Automatic Alternate Conditional Routing — A feature used to control the

routing of particular calls using conditional routing. For example, you can

limit the number of communications satellite hops (communications

satellite links used as trunks) in any end-to-end private network routing

pattern. Limiting the number of satellite hops may be desirable for

controlling transmission quality or call delay in both voice and data calls.

■ Automatic Transmission Measurement System — A feature used to

perform routine and on-demand maintenance tests on facilities in the

Electronic Tandem Network.

■ Enhanced Trunk Signaling and Error Recovery — A feature that improves

the reliability of Electronic Tandem Network calls by allowing a trunk call to

be retried on another circuit when signaling failures occur.