Polycom RMX 1000, 3150-16966-002 manual Appendix C Glossary, 19-1, Abbreviation/Term Explanation

19

Appendix C: Glossary

Abbreviation/Term

Explanation

	Defines the information-carrying capacity of a channel. In
	analog systems, it is the difference between the highest
Bandwidth	frequency that a channel can carry and the lowest, measured
	in hertz. In digital systems, bandwidth is measured in bits per
	second. The larger a connection's bandwidth, the more data
	can be transmitted in a given amount of time, allowing for
	greater video resolution and more sites in a conference.
	Bits and kilobits per second--a unit of bandwidth--that is the
Bps, Kbps	amount of data that can flow during one second over a
	communications line (using a transmission medium).
	1Kbps=1000Bps
	Common Intermediate Format, an optional part of the
	ITU-T's 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.
CIF, 4CIF, QCIF	When operating with CIF, the amount of data to transmit
	cannot exceed 256K bits. The CIF video format has the
	capacity to transmit video images of 352x288 pixels at
	36.45Mbps and 30 frames per second. A 4CIF format has
	four times the capacity of CIF; QCIF has quarter the capacity
	of CIF.
	Coder-decoder. A device that converts voice and video into
Codec	digital code and vice versa. Refers to the endpoint video
	camera and video board that are used for videoconferencing.
	Connection between two or more endpoints exchanging
	video and audio information. If only two endpoints are
Conference	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.
	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
DTMF	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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