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Appendix A
Glossary
This appendix lists the terms and abbreviations that are related to the
Polycom RMX 2000, and are commonly used in the RMX 2000
documentation
.
Abbreviation/
Term
Explanation
Bandwidth Defines the information carrying capacity of a channel. In
analog systems, it is the difference between the highest
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. For more information, see
Line Rate.
Bps, Kbps Bits and kilobits per second; a unit of bandwidth, that is
the amount of data that can flow during one second over a
communications line (using a transmission medium).
1 Kbps=1000 Bps
Carrier A telephone or other company that provides
telecommunication transmission services.
CIF, 4CIF, QCIF 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. 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.