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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Introduction
Page 1-15Tandem Trunking and Tandem Switching
1
In Figure 1–5, the 3-system star configuration that we saw earlier has been
modified to bring out some additional possibilities for private network
configurations. Consider the following points as you review this graphic:
■ All three systems are Release 6.1 or later systems and enjoy the
advantages of tandem PRI trunks, including MLX telephone display
capabilities and high-speed data communications among networked
systems.
■ System B is a corporate data-processing center with no facilities connected
to the PSTN. It is located in the same building as System A. Outside calls
for System B arrive at System A. All intersystem calls pass through System
A, the hub system.
CAUTION:
!
Unless networked systems are co-located, each system should have
at least one loop-start line connected to the PSTN. The line is
required to allow connection of a power-failure telephone to the
Power-Failure Transfer (PFT) jack on a module as a power outage
backup and for correct routing of emergency and other N11 (911, 411,
etc.) calls. To ensure that the correct services are reached, if the
loop-start line is used for emergency or other N11 calls, it should be
assigned to the main pool. In this case, inter-exchange (IXC) calls
determine the number of loop-starts required. Refer to
Feature
Reference
guide for details on the PFT feature.
■ PRI dial-plan routed calls arrive at System C, where they are routed to a
telemarketing calling group on System A. These agents primarily use the
outside PRI facility connected to their system to return customer calls.
■ Both System B and System C share the voice mail/automated attendant
application connected to System A. Calls are routed from the automated
attendant to users on all these systems.
NOTE:
For Release 6.0 networks, Centralized Voice Mail is not available. Each
system must have its own voice mail application for voice mail coverage.
However, with Release 6.0 Version 11 and later systems, calls can be
routed over the private network from a centralized automated attendant.