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MGC Manager User’s Guide - VoicePlus Edition
A-3
CAS Channel Associated Signalling. An interface for Audio Only
conference participants. See also T1-CAS.
CIF, 4CIF, QCIF Common Intermediate Format, an optional part of the
ITU-T H.261 and H.263 standards. CIF specifies 288 non-
interlaced luminance lines, that contain 176 pixels. CIF can
be sent at frame rates of 7.5, 10, 15, or 30 per second. When
operating with CIF, the amount of data to transmit cannot
exceed 256 K bits (where K equals 1024).The CIF video
format has the capacity to transmit video images of 352x288
pixels at 36.45 Mbps and 30 frames per second. A 4CIF
format has four times the capacity of CIF; QCIF has quarter
the capacity of CIF.
Circuit Another term for span; a T1 or E1 line.
Codec Co
der-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 video conferencing.
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. See also MCU.
CSU Channel Service Unit. Customer-provided equipment that is
used as an interface between a communication network and
the data terminal.
D-Channel The channel in a span or in a group of spans, which is used to
transmit signaling information between the (public or private)
switch and the MGC–100.
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.
Abbreviation/
Term
Explanation