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Electronic Tandem Network 11
Overview for Avaya IP600 Internet Protocol Communications Server
555-233-001 — Issue 5 — November 2000
94
Electronic Tandem Network
If your company requires a medium-to-large network spanning a large geographic
area, nationwide or even worldwide, Electronic Tandem Network (ETN) is the
answer. An ETN is a wide-area private network that tandems calls through one or
more switches to route the calls to their destinations.
An ETN consists of tandem switches, inter-tandem tie trunks that interconnect them,
access or bypass trunks from tandem switches to main switches, and the software and
equipment to support call routing over the trunking facilities. Different ETN locations
are connected via analog or digital tie trunks. For example, a DS1 interface can act as
a high-speed (1.544 Mbps) digital backbone for voice and data communications
between ETN locations.
An ETN can be configured hierarchically. An ETN can connect individual switches;
it can also connect other private networks (such as Main/Satellite/Tributary networks)
together.
Within an ETN, each location is identified by a unique private network location code,
similar to the public network office codes that exist within an area code. When
accessing the ETN, a user dials a feature access code for the Automatic Alternate
Routing feature plus the 7-digit number, for a total of eight digits.