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MERLIN LEGEND Communications System Release 6.0
System Manager’s Guide
555-660-118
Issue 1
February 1998
System Components
Page 3-10Control Unit
3
MERLIN LEGEND Communications System to a DEFINITY system.
Whether used for digital tie-trunk emulation or not, a T1 data-operation
channel provides data communications only, not voice communications.
800 NI-BRI Module 3
Available for Release 4.0 and later systems, this module supplies eight line/trunk
jacks for connecting central office facilities that use the standard National ISDN 1
(Integrated Services Digital Network 1) protocol and the BRI (Basic Rate
Interface) access arrangement (this combination is abbreviated
NI-1 BRI
). These
digital facilities are available from COs in many areas.
Each facility actually includes two “virtual” lines, two B-channels for carrying voice
and data, as well as a third D-channel for handling signaling and maintenance.
NOTE:
The 800 NI-BRI module is not available in Behind Switch mode.
Summary 3
Figure 3–3 shows the modules; Table 3–1 lists the number of available jacks for
each module and presents a brief description of the equipment you can connect
to it.
NOTE:
Modules labeled “GS/LS” can accept ground-start trunks, loop-start trunks,
or a combination of both types of trunks.