Glossary
HS 2000 System Administrator’s Handbook
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EIA. Electronic Industries Association. A United States organization
that sets standards for electronic products.
FCIF. Full Common Intermediate Format. A video format with an image
size of 352 pixels by 288 pixels.
frame rate. The frequency that video frames appear on a monitor, usually
measured in frames per second (fps). Broadcast-quality video generally
consists of 30 fps. Full-motion videoconferencing typically offers video
in the range of 10 to 15 frames per second. At very low bandwidths,
such as 56 or 112 Kbps, the frame rate may be lower.
full-duplex audio. Audio that allows remote sites to speak
simultaneously without losing audio contact. Full-duplex audio
may be provided in a point-to-point or multipoint conference.
G.711. ITU-T audio algorithm, 64 Kbps, 3.4 kHz.
G.722. ITU-T audio algorithm, 48-56-64 Kbps, 5-7 KHz.
G.728. ITU-T audio algorithm, 16 Kbps, 3.4 kHz.
H.221. A framing standard that is part of the ITU-T’s H.320 set of video
interoperability recommendations. Specifies synchronous operation in
which the coder and decoder handshake and agree upon timing.
H.261. An ITU-T standard for a video codec used on ISDN lines.
HDLC protocol. High Level Data Link Control. In this guide,
VTEL HDLC refers to VTEL’s proprietary version of the standard
bit-oriented protocol developed by the International Standards
Organization (ISO).
IMUX. Inverse multiplexer.
