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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Data Communications
Page 5-17About Data and Video Communications
5
Group Videoconferencing 5
A group videoconferencing system consists of a video camera, an audio unit, and
a display screen (such as a television) that connect to a coder-decoder (CODEC).
The CODEC converts the analog voice and video signals into digital form for
transmission, and converts the digital signals received back into analog form.
The CODEC may use either a BRI interface to connect directly to an available
MLX port on a 408 MLX or 008 MLX module, or a v.35 interface to connect to an
ISDN terminal adapter (such as the Ascend Pipeline 25PX or 50) which in turn
connects to an MLX port.
NOTE:NOTE:NOTE:
When using the 008 MLX or 408 GS/LS-MLX module for data or video, you
must
not
use Version 29 of the module. Use an earlier or later version.
When the group videoconferencing system uses a BRI interface, or an ISDN
terminal adapter that supports 2B Data, the video system may be connected to a
single MLX port that has been configured as a 2B Data port. This allows the video
system to use both B-Channels assigned to the MLX port, thereby achieving the
high-speed data connection necessary to support video.
If the group videoconferencing system uses a v.35 interface to connect to an
ISDN terminal adapter that does not support 2B Data, then two ISDN terminal
adapters are required (each connecting to a separate MLX port that has been
configured as a 1B Data port) in order to achieve a 2B Data connection.
NOTE:NOTE:NOTE:
Do not connect equipment, such as an ISDN terminal adapter or G4 fax
machine, that does not support 2B Data to an MLX port that has been
configured as a 2B Data port. This wastes system resources and may
cause other system errors.
The network facilities used by the endpoint connected to the MLX port may be any
combination of PRI, T1 Switched 56 (both provided by the 100D module), and/or
NI-1 BRI (provided by the 800 NI-BRI module) facilities, however it is
recommended that you use two B-channels of the same type to ensure the best
possible connection. See Figure 5–6
for a sample connection diagram.
NOTE:NOTE:NOTE:
See the Network Reference for information on group videoconferencing
over private network tandem trunks.