Personal videoconferencing system-
A system designed to
connect a single person into a teleconference. Most desktop video conferencing
systems are personal systems.
Frame rate-
The number of images per second displayed in a video stream.
Approximately 24 frames per second (fps) is considered full-motion video.
POTS (Plain Old Telephone Service)-
Conventional analog
telephone service.
ISDN (Integrated Services Digital Network) -
A type of digital
telephone service available in two speeds: 128-Kbps basic-rate interface (BRI) and
1.54-Mbps primary-rate interface (PRI).
H.261-
Leads the pack. H.261 is the standard for video codecs, with the compressed
video signal operating over one or more 64-kbps ISDN B-channels. H.261 defines two
picture or resolution structures that are compatible with all three worldwide television
display formats. The picture structures are the Common Intermediate Format (CIF)
and the Quarter Common Intermediate Format (QCIF). CIF is also referred to as “full
CIF” (FCIF).
H.323-
Standard that provides a gateway for LAN/WAN videoconferencing.
Desktop video conferencing on the LAN must adjust to the constantly-changing
available bandwidth. This means LAN-based videoconferencing requires special
compression technology. H.323 also covers Internet video-conferencing. Early in
1996, Intel and Microsoft, along with more than 70 other companies, announced
support for the standard. Inter and Microsoft also collaborated on the H.323 stack that
would become part of Microsoft’s operating system.