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Tandem Switching Feature
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Description
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- This topic only summarizes information about private networks. Detailed
information is included in the Network Reference.
- DEFINITY ECS, DEFINITY BCS, or DEFINITY ProLogix Solutions features
and operations are beyond the scope of this guide. This book discusses
the network from the MERLIN MAGIX Integrated System's perspective.
- When a network consists of more than two systems, a coordinating
System Manager should act as a coordinator for all changes to network
systems dial plans, non-local dial plans, ARS routing, UDP routing,
and Remote Access. Otherwise, the two System Managers should plan together
and agree upon any changes that are made subsequently.
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The MERLIN MAGIX Integrated Systems can be networked with one another or with
MERLIN LEGEND, DEFINITY ECS, DEFINITY BCS, or DEFINITY ProLogix Solutions Communications
Systems in private networks. Tandem switching permits a system to route an outside
call over a facility that carries the call outside the local system, rather
than routing it to an extension connected to the system. Delay-start (T1-emulated
voice and/or data, or analog) tie trunks or PRI facilities can act as tandem
trunks to connect networked systems.
This section describes how line/trunk operations are set up and used for optimal
cost savings and functionality across private networks, including the following
topics:
- Switch identifiers
- ARS access to lines/trunks on remote networked systems
- Remote Access settings to allow network routing
- Feature interactions with line/trunk features such as pools and PRI
Uniform Dial Plan Features describes how the system is set up and used for
one aspect of private networks: non-local dial plan extensions, including the
following topics:
- Intersystem calling between extensions located at different systems in
a private network
- Details of UDP routing for intersystem calls and other routed calls
- Feature interactions across private networks
Tandem switching offers the following features and benefits:
- Toll Savings. Private networked trunks allow you to realize cost
savings on long-distance and toll calls in the two following ways:
- Callers on a local system can use ARS to reach the public switched telephone
network via outside trunks connected to networked remote systems, decreasing
the cost of toll calls. No special dialing is required. See Automatic
Route Selection (ARS), Uniform Dial Plan Routing, and Remote Access
for details.
- In addition, organizations can use private networked trunks to make calls
between networked systems, which may be geographically distant from one
another. For details about this functionality, see Uniform
Dial Plan Features.
- Service Cost Savings. There are two ways that organizations can
save on costs incurred from service providers:
- Customers order a point-to-point T1 facility from a service provider,
then use system programming to set it up for tandem PRI or tandem T1 services.
As necessary, a service provider can provide amplification for these digital
tandem trunks, but does not supply switching services.
- The system supports fractional use of PRI and T1 facilities through drop-and-insert
equipment placed between networked systems that tandem trunks connect. This
technique is often used to provide 2B data services on the dropped channels
or B-channels, while reserving the remaining lines for voice traffic. All
T1 channels (emulated tie and Switched 56 data) and PRI B-channels must
still be programmed and all do count towards the system maximum of 80 lines.
To learn more about using and setting up T1 and PRI tandem trunks, refer
to Primary Rate Interface (PRI) and T1.
- Shared Applications. Networked systems should have their own Music-On-Hold
sources, but they can share a voice messaging system (see the Network Reference
).
Although many features are available using tie trunks for network connectivity,
PRI tandem trunks provide greatly enhanced features and speed. For this reason,
PRI is recommended over tie (T1-emulated voice and data or analog) for private
networks.
To correctly set up systems for transparent calling among non-local dial plan
extensions, the System Manager first assigns networking tandem trunks to pools.
For more information, see Pools. For additional
details about setting up PRI and T1 tandem trunks, see Primary
Rate Interface (PRI) and T1.
In order to realize the cost savings afforded by tandem switching, System
Managers must first label networked tandem trunks with switch identifiers, described
in the next section.
