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Application Sharing
A feature of many videoconferencing applications that enables the conference
participants to simultaneously run the same application. The application itself
resides on only one of the machines connected to the conference.
Endpoint
SIP or H.323 terminal or gateway. An endpoint can call and be called. It
generates and terminates the information stream.
Common Intermediate Format
n.) A video format used in video conferencing systems that easily supports both
NTSC and PAL signals. CIF is part of the ITU H.261 video conferencing standard.
It specifies a data rate of 30 frames per second (fps), with each frame
containing 288 lines and 352 pixels per line.
A related standard, QCIF (Quarter CIF), transfers one fourth the amount of data
and is suitable for videoconferencing systems that use telephone lines. CIF is
sometimes called Full CIF (FCIF) to distinguish it from QCIF.
Distance Learning
A type of education, typically college-level, where students work on their own
at home or at the office and communicate with faculty and other students via
e-mail, electronic forums, video conferencing, chat rooms, bulletin boards,
instant messaging and other forms of computer-based communication.
Most distance learning programs include a computer-based training (CBT) system
and communications tools to produce a virtual classroom. Because the Internet
and World Wide Web are accessible from virtually all computer platforms, they
serve as the foundation for many distance learning systems.
G.723.1
An ITU-T double rate CELP codec (6.4/5.3 kbps, medium quality, high processor
load).
G.729
An ITU-T ACELP codec (8 kbps, medium quality, high processor load).
G.726
An ITU-T ADPCM wave form codec (16/24/32/40 kbps, good quality, low processor
load).
G.7xx
G.7xx is a set of ITU-T standards for audio compression and de-compression, used
primarily in telephony.
H.324
A suite of standards approved by the International Telecommunications Union
(ITU) that defines video conferencing over analog (POTS) telephone wires. One
of the main components of H.324 is the V.80 protocol that specifies how modems
should handle streaming audio and video data.
H.323
ITU) standard that provides specification for computers, equipment and services
for multimedia communications over packet-based networks that defines how
real-time audio, video and data information is transmitted. H.323 is commonly
used in VoIP, Internet telephony and IP-based video conferencing. Users can
connect with other users over the Internet and use varying products that
support H.323. This standard is based on the Internet Engineering Task Force
(IETF) Real-Time Protocol (RTP) and Real-Time Control Protocol (RTCP), with
additional protocols for call signaling and data and audiovisual
communications.
