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MGC Manager User’s Guide - Volume I
B-5
H.231 ITU-T standard that defines a set of MCU functions and
operational requirements.
H.242 ITU-T standard that defines initiation of communications
between systems and capabilities negotiation procedures.
H.243 ITU-T standard that defines initiation of communications
between systems and capabilities negotiation procedures
in multipoint conferences.
H.261 ITU-T standard that defines the Px64 video coding
algorithm.
H.263 ITU-T standard that provides improved compression and
quality of video images at a line rate lower than 384 Kbps.
This standard is not supported by all codecs.
H.264* A proprietary Polycom Video compression standard.
H.264 ITU-T standard that provides improved compression and
quality of video images in lower line rate connections and
is part of the Highest Common mechanism in Video
Switching conferences.
H.320 ITU-T standard that defines how the H-series video
conferencing recommendations work together.
H.323 ITU-T standard for audio, video and data communications
across IP-based (LAN) networks, including the Internet.
IMUX or Inverse
Multiplexing
A feature that allows high speed serial data streams to be
divided into multiples of 56 or 64 Kbps for transmission
over public digital switched networks (PSTN). At the
remote end, all the channels are phase-aligned and
synchronized to recreate the original data stream.
IP Internet Protocol. The working protocol that forms the
basis of the internet.
ISDN Integrated Services Digital Network. A set of protocol and
interface standards (voice, video and data) that comprise
a telephone network. There are two types of ISDN lines:
BRI and PRI.
Abbreviation/
Term
Explanation