Lucent Technologies MERLIN LEGEND Release 6.1 Feature Reference page 250

MERLIN LEGEND Communications System Release 6.1
Feature Reference 555-661-110
Features
Digital Data Calls
If a videoconferencing system requires two B-channels but does not have an
ISDN-BRI interface (some older group video systems have V.35 interfaces, for
example), it may need to use the adjunct extension numbers of two different MLX
extension jacks.
Primary Rate Interface
The ISDN Primary Rate Interface (PRI) is a standard access arrangement that
can be used to connect the system to a network providing voice and digital data
services.
PRI is a standard access arrangement that uses a DS1 facility (also called a pipe )
to support twenty-three 64-kbps data connections (known as B-channels ) and one
64-kbps connection (known as a D-channel ). The D-channel is used to convey
signaling information. Some PRI service allows only voice calls and does not
support data. For more information, see
page 489.
T1 Switched 56 Lines
A T1 facility can be connected to the MERLIN LEGEND Communications System
to supply a number of data and voice services. Release 4.0 and later systems can
support one Switched 56 (56 kbps) data connection on each Digital Signal Level 0
(DS0) channel of the T1 facility. There are 24 DS0 channels on each T1 facility.
For more information, see
Basic Rate Interface
Basic Rate Interface (BRI) is a standard ISDN access arrangement that can be
used to connect the system to a network providing voice and digital data services.
The full designation for BRI service is ISDN NI-1 BRI. BRI is supported in
Release 4.0 and later systems only. BRI supports two 64-kbps data connections
(known as B-channels or lines ) for up to 128 kbps data throughput. For more
information, see the section
2B Data
The combination of two data-bearing channels ( B-channels ) allows ISDN-BRI
devices (such as desktop and group video systems with ISDN-BRI interfaces) to
connect to a single MLX port and make full 128-kbps connections using ISDN
NI-1 BRI or ISDN PRI B-channels, or make 112-kbps connections when
T1 Switched 56 facilities are used.
NOTE:
For more information about 2B data, see the Data/Video Reference .
Devices used for 2B data must be connected to MLX jacks that are programmed
as 2B data-capable. Devices that do not support 2B data should not be connected
to ports programmed for 2B data.
"Primary Rate Interface (PRI) and T1" on
"Primary Rate Interface (PRI) and T1" on page
"Basic Rate Interface (BRI)" on page
Issue 1
August 1998
Page 201
489.
88.