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Appendix B: Glossary
B-4
DTMF Dual Tone Multi Frequency. A system of coded signals
used by touch-tone telephones in which a specific sound,
frequency or tone is assigned to each key so that the
signal can be easily recognized by a computer. The codes
enable data input and control of voice-processing
systems. DTMF signals can pass through the entire
connection to the destination device and therefore are
used for remote control after the connection with the MCU
is established.
E1 line A 2 Mb digital switched line used in Europe.
Endpoint An endpoint is any videoconferencing unit.
FECC Far End Camera Control. In certain video cameras, the
accompanying software that enables a participant to
control a remote camera. Used in Continuous Presence
video conferences in conjunction with the LSD option.
See also LSD.
Frame A group of bits that make up an elementary block of video
data for transmission by certain protocols.
Frame Rate The number of video frames displayed on-screen during
one second, measured in fps (frames per second).
G. 711 ITU-T audio algorithm, 64Kbps, 3.4 kHz.
G. 722 ITU-T audio algorithm, 64Kbps, 7 kHz.
G.728 ITU-T audio algorithm, 16Kbps, 3.4 kHz.
Gatekeeper A type of server that performs two main functions:
translates LAN alias addresses of terminals and gateways
to IP addresses and provides bandwidth management.
H.221 ITU-T standard that defines how to multiplex video, audio,
control, and user data into one serial bit stream.
H.230 ITU-T standard that defines simple multipoint control
systems procedures and describes network maintenance
functions.
Abbreviation/
Term
Explanation