Lucent Technologies MERLIN LEGEND Release 7.0 System Manager's Quick Reference page 16

MERLIN LEGEND Communications System R7.0
System Manager's Quick Reference 555-670-119
Getting Started
System Overview
Incoming Trunks — Continued
Trunk Type Description
T1 In T1 voice operation, a line can be programmed through the
system, without the services of a telephone company installer, to
emulate a ground-start, loop-start, tie, or DID trunk. T1 operation
also gives you access to special services, such as inbound 800
or WATS service for incoming, toll-free service for voice calls.
T1 data operation allows high-speed data communications over
the public switched network; this is called T1 Switched 56
service . It also provides data tie lines to connect one MERLIN
LEGEND Communications System to another or to a DEFINITY
system. A T1 data operation line is called a channel.
Primary Rate A digital facility that provides the equivalent of 24 lines, called
Interface channels, 23 of which are B-channels. Each B-channel can
(PRI) dynamically provide voice and data services; one D-channel
carries signaling information for the 23 B-channels.
Basic Rate A digital facility that provides the equivalent of 3 lines, called
Interface channels, 2 of which are B-channels. Each B-channel can
(BRI) dynamically provide voice and data services; one D-channel
carries signaling information for the 2 B-channels.
Issue 1
April 1999
4