Lucent Technologies MERLIN LEGEND Release 7.0 System Planning Manual page 285

MERLIN LEGEND Communications System Release 7.0
System Planning 555-670-112
5 Data Communications
About Data and Video Communications
Group Videoconferencing
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 GS/LS MLX, 408 GS/LS-ID-MLX, 008 MLX module, 016 MLX
(Release 7.0 and later systems) module, or a v.35 interface to connect to an ISDN
terminal adapter, which in turn connects to an MLX port.
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:
Do not connect equipment that does not support 2B Data—such as an
ISDN terminal adapter or G4 fax machine—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
NOTE:
See the Network Reference for information on group videoconferencing
over private network tandem trunks.
5
Figure 5-6 for a sample connection diagram.
Issue 1
April 1999
5-15