Polycom DOC2066F manual Cas

MGC Manager User’s Guide - VoicePlus Edition

Abbreviation/	Explanation
Term
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	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 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-pointand 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.

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