Chapter 4: Overview; Contents; Private Networks - Avaya Communication Server 1000 Series Reference

Chapter 4: Overview

Contents

This section contains information on the following topics:

Private networks

Switch designations
Supervision
Modes of operation
Start dial control
Private networks
Private networks have three basic elements:
1. telephones
2. a circuit switch
3. transmission facilities
Each telephone connects to a Private Branch Exchange (PBX) circuit switch that establishes
connections between the telephones. In a private network, connections between telephones
on different switches are established over a transmission facility (such as a trunk) between the
pair of switches, or over a tandem connection of transmission facilities and intermediate
switches.
To place a call, the end user dials a string of digits that direct the connection to the target
telephone. In Tandem TIE Trunk Networks (TTTNs), the dialed digits steer the connection
through the network. A string of successive access codes cause facilities to connect in tandem
until the switch that connects to the destination telephone is reached. Each time a switch
connects a new facility in tandem, it passes the digits onto the connected facility.
In an Avaya Communication Server 1000 (Avaya CS 1000) and Meridian 1 network, the
Electronic Switched Network (ESN) node switches collect all digits of the called number and
pass the full-called number between switches. The called number is dialed in a Uniform Dialing
Plan (UDP) format. Switches connected to ESN nodes may need the dialed numbers in a
Electronic Switched Network Reference — Signaling and Transmission
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