MERLIN LEGEND Communications System Release 6.1
Feature Reference
555-661-110
Issue 1
August 1998
Features
Page 501Primary Rate Interface (PRI) and T1
handling similar to Direct Inward Dial (DID). It performs digit analysis on incoming
calls, matches to Called Party Numbers (CdPNs), and delivers the calls to the
destinations based on the respective Called Party Numbers. It also allows multiple
calls to the same directory number. That is, multiple concurrent incoming calls
with the same Called Party Number can be delivered to a destination
simultaneously.
NOTE:
In Release 6.0 and later systems, when T1-emulated tie facilities are used
as tandem tie trunks, digit manipulation can be performed through UDP
routing. See “Uniform Dial Plan Features” on page 710
for details.
DS1 Facility Options 31
A Digital Signal Level 1 (DS1) facility is a transmission system that transports
digital signals in the DS1 format. The interface that allows the connection of DS1
facilities to the system is the 100D module. Through this module, voice and data
calls can be made or received using a DS1 facility.
Twenty-four Digital Signal Level 0 (DS0) channels, each operating at 64 kbps,
plus framing bits, are multiplexed, forming a DS1 signal of 1.544 Mbps. Each DS0
channel within the DS1 signal corresponds to a logical port. Although there is only
one physical jack, the 100D module supports up to 24 logical ports (one for each
channel).
In DS1 format, calls to other digital PBXs or telephone company foreign
exchanges (FXs) remain digital. Signals do not need to be converted to analog for
acceptance by the connecting trunk, except for networked applications such as
off-premises extensions or situations where your communications equipment
does not allow a DS1 digital interface. In addition, the 100D module can be
configured to work with T1 or PRI service.
To connect the 100D module to an outside DS1 facility, a channel service unit
(CSU) is used. The CSU regulates the transmission into and out of the 100D
module so that the module matches the transmission of the outside facility.
Both ends of the DS1 facility must be able to communicate. To ensure this, the
following options are set during system programming to match the transmission of
the outside DS1 facility:
■ Type of service (T1 or PRI)
■ Framing format
■ Line coding
■ Channel service unit
■ Line compensation
■ Clock synchronization
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