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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Introduction
Page 1-4Networking Concepts
1
Benefits of Networking 1
Available for Hybrid/PBX mode systems, the private network features of the
MERLIN LEGEND Communications System Release 6.0 and later provide the
following advantages for geographically dispersed organizational sites:
■ Toll Savings. Private networked trunks allow you to realize significant cost
savings on toll calls by performing tandem switching in the following two
ways:
— Callers on a local system can reach the PSTN via outside trunks
connected to other systems in a private network, avoiding toll charges or
substantially decreasing the cost of toll calls. For example, if you are in
Cincinnati and another site in your company is in Dallas, you can make
a call to a number in the Dallas local calling area over your private
network, decreasing toll costs.
— In addition, organizations use private networked trunks to make calls
between networked systems, which may be geographically distant from
one another. Using the example above, from your office in Cincinnati
you can dial an extension at a sister site in Dallas, just as you would dial
an extension on your own local system, without a costly long-distance
phone call. You simply dial the extension number.
■ Service Cost Savings. In addition to toll call savings, there are two other
ways that organizations can save on service costs incurred from
telecommunications providers that provide PSTN access:
— You order a point-to-point T1 circuit from a service provider, then use
system programming to set it up for tandem PRI services. As necessary,
a service provider provides amplification for PRI tandem trunks in cases
where the distance between networked systems is great enough to
distort signals, but the service provider does not supply switching
services.
— You can tailor your use of PRI B-channels with drop-and-insert
equipment that allows fractional use of T1 channels for non-MERLIN
LEGEND data/video communications between sites, while keeping the
remaining T1 channels for PRI voice or data traffic.
NOTE:
The 24th T1 channel must not be dropped before reaching the
MERLIN LEGEND Communications System because MERLIN
LEGEND uses the 24th channel as the PRI D-channel or signalling
channel.
— You can tailor your use of T1 channels to support a mix of T1-emulated
tandem tie trunks for voice or data communications at 56 kbps per
channel, allowing 2B data transfers at 112 kbps. The system also allows
fractional use of point-to-point T1 tandem trunks with drop-and-insert
equipment.