Appendix K - Applications
Videoconferencing
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Through its support of high-speed digital facilities, the system allows
you to use several types of advanced data communications applications,
including videoconferencing and rapid data transfer. For more information
about digital facilities and adjuncts, see the following topics:
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The system supports two types of videoconferencing systems:
- Desktop Videoconferencing Workstation. This type of data workstation
typically consists of a PC or LAN workstation with one or more videoconferencing
circuit boards installed; the video system is equipped with an ISDN-BRI interface.
A microphone, software, and a video camera are also included. This type of
video workstation does not require separate data communications equipment.
- 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:
- 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.
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For complete information about videoconferencing, see the Data/Video
Reference . In this guide, includes details about how the system functions
with 2B data.
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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 system.
Making and receiving voice calls are not supported on telephones included
with videoconferencing systems.
