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Appendix A-Glossary
A-2
Codec Coder-decoder. A device that converts voice and video
into digital code, and vice versa. Refers to the endpoint
video camera and video board that are used for
videoconferencing.
Conference Connection between two or more endpoints exchanging
video and audio information. If only two endpoints are
involved, a conference is called point-to-point and no
MCU is required. If more than two endpoints are involved,
it is called a multipoint conference, and an MCU
(Multipoint Control Unit) is required as the management
system. For more information, see MCU.
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.
Endpoint A hardware device, or set of devices, that can call, and be
called by an MCU or another endpoint. For example, an
endpoint can be a phone, a camera and microphone
connected to a PC or an integrated Room System
(conferencing system).
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. For
more information, see 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.
Abbreviation/
Term
Explanation