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Chapter 19-
19-2
Appendix C: Glossary
Abbreviation/Term Explanation
Endpoint
A hardware device, or set of devices, that can call, and be
called by an MCU or another endpoint. For example, an
endpoint can be a phone, a camera, or microphone
connected to a PC or conferencing system.
FECC
Far End Camera Control. The accompanying software in
certain cameras that enables a participant to control a
remote camera.
Frame
A group of bits that make up an elementary block of video
data for transmission by certain protocols.
Frame Rate
The number of video frames displayed on-screen during
one second, measured in fps (frames per second).
G.711 ITU-T audio algorithme, 64Kbps, 3.4 kHz.
G.722 ITU-T audio algorithme, 64Kbps, 7 kHz.
G.728 ITU-T audio algorithme, 16 Kbps, 3.4 kHz.
Gatekeeper
A type of server that performs two main functions:
translates LAN alias addresses of terminals and gateways
to IP addresses and provides bandwidth management.
H.221
ITU-T standard that defines how to multiplex video, audio,
control, and user data into one serial bit stream.
H.230
ITU-T standard that defines simple multipoint control
systems procedures and describes network maintenance
functions.
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 384Kbps.
This standard is not supported by all codecs.
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.323
ITU-T standard for audio, video and data communications
across IP-based (LAN) networks, including the Internet.
IP
Internet Protocol. The working protocol that forms the basis
of the internet.
ITU-T Standard
International Telecommunications Union,
Telecommunication Standardization Sector (formerly
CCITT). An international group that produces official