Lucent Technologies MERLIN LEGEND Release 6.1 Feature Reference page 723

MERLIN LEGEND Communications System Release 6.1
Feature Reference 555-661-110
Features
Tandem Switching
Shared Applications. Networked systems should have their own local
voice mail and/or auto attendant applications as well as their own external
alerts and Music On Hold sources. However, a single auto attendant can
distribute calls throughout the network. It can answer only those calls that
arrive on the PSTN trunks of the system where it is connected.
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
setting up PRI and T1 tandem trunks, see
on page 489.
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.
Switch Identifiers
Switch identifiers designate, for each networked trunk, the system connected at
the other end of the that trunk. The system manager must program switch
identifiers to assure proper volume levels on private network trunks and to allow
proper routing for calls across the network.
The correct switch identifier for a trunk or block of trunks is determined by the type
of switch to which the trunk is connected and whether or not that switch is a
satellite switch (located within 200 miles of the local system). It is important to
know the distance between systems in order to assure transmission quality. The
identifiers are switch numbers that have the following meanings:
Unassigned, no value = trunk connected to CO (central office)
1–20 = trunk connected to a non-satellite MERLIN LEGEND
Communications System
21–40 = trunk connected to a satellite MERLIN LEGEND Communications
System
41–50 = trunk connected to a non-satellite system that is not a MERLIN
LEGEND Communications System (for example, a DEFINITY ECS)
51–60 = trunk connected to a satellite system that is not a MERLIN
LEGEND Communications System (for example, a DEFINITY ProLogix
Solutions communications system)
A MERLIN LEGEND Communications System is always identified by a number
between 1 and 40, whereas DEFINITY ECS or DEFINITY ProLogix Solutions
systems are identified by numbers between 41 and 60.
"Pools" on page 481. For additional details about
"Primary Rate Interface (PRI) and T1"
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Issue 1
August 1998
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