Glossary
HS 2000 System Administrator’s Handbook
168
QCIF. Quarter CIF. A video format that transmits 9.115 Mb at
30 frames per second, which is one quarter the speed of CIF. A lower
resolution (176 pixels by 144 pixels) than FCIF, but is used on more
videoconferencing systems than FCIF.
RJ-45. Registered Jack 45. An 8-connector modular jack used for data
transmission over standard telephone wire.
RS-366. An EIA interface standard for auto dialing.
S-Video. A higher resolution version of composite video. See also
composite video.
Switched 56. SW 56. Digital transmission at 56 Kbps, typically
over a 2-wire or 4-wire switched 56 line. Switched 56 is primarily
used in North America.
T1. Transmission system in which time division multiplexing is used
to carry 24 digital voice or data channels at the rate of 1.544 Mbps
over copper wire.
TA. Terminal Adapter. An adapter commonly used with an
ISDN BRI line.
voice-activated switching. In multiway videoconferencing, lets all
participating sites automatically see the site that is currently speaking.
V.35. Transmission interface between the codec and the transmission link
that permits switched 56 connectivity.