MERLIN LEGEND Communications System Release 5.0
Feature Reference
555-650-110
Issue 1
June 1997
Features
Page 452
Primary Rate Interface (PRI) and T1
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, excluding 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
■
Signaling mode (for T1 service only)
NOTE:
Most of these settings are dependent upon the central office and the type
of service (T1 or PRI) to which you subscribe.
Type of Service
3
0
The system supports two types of service for DS1 facilities: T1 and PRI. The 100D
module can be programmed to operate in either type of service. T1 service
transmits and receives voice and analog data, as well as digital data in Release
4.0 communications systems; PRI transmits and receives voice, analog, and
digital data. Any combination of the following AT&T Switched Network (ASN)
Services can be provided through a T1 or a PRI line/trunk:
■
Megacom WATS service for domestic outgoing long-distance voice calls
■
Megacom 800 service for domestic toll-free incoming voice calls
■
Software-Defined Network (SDN) for voice and circuit-switched data calls
■
MultiQuest®
for 900 service numbers
