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User Guide for Polycom® RMX™ 500 and Polycom® RMX™1000 Systems
(Conference on Ports)
19-3
Abbreviation/Term
Explanation
amount of data that can flow during one second over a
communications line (using a transmission medium). 1
Kbps=1000 Bps.
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 256K bits. 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.
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.
G.711 ITU-T audio algorithm, 64Kbps, 3.4 kHz.
G.722 ITU-T audio algorithm, 64Kbps, 7 kHz.
G0.728 ITU-T audio algorithm, 16Kbps, 3.4 kHz.
H.221
An ITU-T standard that defines how to multiplex video,
audio, control, and user data into one serial bit stream
before transmission.
H.230
An ITU-T standard that defines simple multipoint control
system procedures and describes network maintenance
functions.
H.231
An ITU-T standard that defines a set of MCU functions and
operational requirements.
H.242
An ITU-T standard that defines initiation of
communications between systems and capabilities
negotiation procedures.
H.243
An ITU-T standard that defines communication initiation
and procedure negotiation capabilities between systems in
multipoint conferences.
H.261
An ITU-T standard that defines the Px64 video coding
algorithm.
H.263
An ITU-T standard that provides improved compression
and quality of video images at a line rate lower than
384Kbps. This standard is not supported by all codecs.
H.264
An ITU-T standard that provides improved compression
and quality of video images in low line rate connections
and is a part of the Highest Common mechanism in video
switching conferences.