Lucent Technologies MERLIN LEGEND Release 7.0 Feature Reference page 993

MERLIN LEGEND Communications System Release 7.0
Feature Reference 555-670-110
I Applications
Videoconferencing
Group Videoconferencing Workstations. Group videoconferencing
equipment is usually more expensive than desktop equipment and
provides more capabilities. Such stand-alone systems include a built-in
monitor and are installed in conference rooms or on roll-about units. There
are two types of group videoconferencing workstations:
NOTE:
For complete information about videoconferencing, see the Data/Video
Reference. In this guide,
about how the system functions with 2B data.
Videoconferencing requires PRI, BRI, or T1 Switched 56 digital services for
communications at 56 or 64 kbps (kilobits per second) per channel or B-channel.
Many videoconferencing systems require two channels, for speeds of 112 or
128 kbps.
Basic video system components include the following:
Camera
Microphone
Video codec circuitry that digitizes and compresses audio and video
signals
Cables
Software
Additional data communication equipment may be built-in or required as separate
components.
Group and desktop videoconferencing systems differ primarily in the capabilities
and sophistication of the equipment and software that they include. The type of
interface , not whether they are designed for groups or individuals, differentiates
their use with the communications system.
— ISDN Group Videoconferencing Workstations. ISDN group
videoconferencing systems do not require separate data
communications equipment and are equipped with an ISDN-BRI
interface.
— V.35 Group Videoconferencing Workstation. This type of data
workstation usually consists of a roll-about or built-in
videoconferencing system as its data terminal equipment. The data
communications equipment consists of two ISDN terminal adapters
and sometimes two EIA 232/V.35 converters. The converters are not
needed when the equipment includes interfaces other than V.35,
such as V.24. Sometimes an inverse multiplexor (IMUX) is
connected instead of the two terminal adapters.
"Digital Data Calls" on page 223
Issue 1
April 1999
I-35
includes details