Tandem Trunking And Tandem Switching; Series Configuration; Introduction - Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
1

Introduction

Tandem Trunking and Tandem Switching

line (analog or T1-emulated) or a digital T1 circuit that has been programmed for
PRI.
Figure 1–1
NOTE:
All of the figures in this chapter use the following conventions:
Public Switched Telephone Network (PSTN)
PRI
ML A
New York, NY
Ext.
4321
Figure 1–1.

Series Configuration

To make a call from System A to System C, a user at Extension 4321 dials
reach Extension 3699. The call travels over tandem trunks through System B to
System C without using the PSTN to provide switching services. Systems B and C
in this series configuration are called tandem switches .
Using another aspect of tandem switching, the user at Ext. 3699 employs
Automatic Route Selection (ARS) normally in order to dial a number in the New
York area code,
shows one way that systems can be connected in a private network.
A solid line represents a tandem trunk that connects one system in a
network to another system in a network.
A dashed line represents a facility that carries a call to the PSTN.
A square labeled ML indicates a MERLIN LEGEND
Communications System.
A rounded rectangle labeled DEF indicates a DEFINITY ECS or
DEFINITY ProLogix Solutions system.
PRI
ML B
Chicago, IL

, for example, where
Tie
ML C
Los Angeles, CA
Ext.
5455
February 1998
ML D
Santa Monica, CA
Ext.
3699
is the ARS code. In this
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Ext.
6233

to