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Chapter 19 –
Appendix C: Glossary
19-4
Abbreviation/Term Explanation
H.323
An 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
standards for telecommunications.
LAN
Local Area Network (LAN), a group of computers and other
devices linked via a network’s operating system.
MCU
Multipoint Control Unit (MCU), the device which allows two
or multiple sites to be connected in a video conference.
PCM
Personal Conference Manager, a user interface displayed
on the endpoint’s video output screen. The user interacts
with the PCM through the DTMF command and FECC
function by using the endpoint remote control, to
implement conference control at the MCU. For example,
create a conference, dial into a conference, set the window
layout, remotely control the camera, and terminate a
conference.
QCIF
Quarter CIF. A video format with the image size of 176x144
pixels that transmits 30 frames at 9.115 Mbps per second
(a quarter of the capacity of CIF). For more information,
see CIF.
QoS
Quality of Service (QoS). QoS defines the performance of
a network service, such as the average delay between
packets.
ToS
Type of Service (ToS). It defines optimization tagging for
routing audio and video packets.
WAN
Wide Area Network (WAN). A communications network
that services a geographical area larger than the LAN.