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181Glossary
Appendix
G.728
Audio encoding/decoding format
recommended by the ITU-T. A phone
bandwidth audio signal is converted to a
digital signal with a data rate of 16 Kbps.
Gatekeeper
Controls the access of H.323
videoconference devices on a network.
Administers the zone, access limitation,
audio/video bandwidth, and alias etc.
H.221
Frame structure for a 64 to 1920 Kbps
channel in audiovisual teleservices.
H.261
Video codec for audiovisual services as p ×
64 Kbps. Videoconferencing standard that
defines a video coding algorithm, picture
format and error correcting technology for
communication between different
manufacturers’ video codecs.
H.263
A video coding algorithm based on the H.
261 standard. This format enables
communication via a lower bit rate.
H.263+
Video encoding/decoding format based on
the H.263 standard, added by the Annex I to
T (I, J, K …… T), that allows enhanced
picture quality and error resistance.
Normally, this format is a profile used with
a combination of some of the Annex for
H.263/H.263+.
H.320
A videoconferencing standard for
communication between different
videoconferencing system.
H.323
This enables communications on the non-
QOS (Quality of Service) LAN.
HMLP
See “MLP”.
I-MUX
An abbreviation for Inverse Multiplexer.
This protocol allows you to transmit the data
at 384 Kbps via 6B-channel.
ISDN
An abbreviation for Integrated Services
Digital Network. This is a communication
protocol by CCITT on transmission of
integrated voice, video, and data.
Bandwidths include basic (64 Kbps) and
primary rate (1.544 and 2.048 Mbps).
ITU-T
An abbreviation for International
Telecommunication Union,
Telecommunications.
Lip synchronization
A function that synchronizes sound with
motion. Sound processing is much faster
than motion processing, thus sound and
motion sometimes get out of step with each
other.
MCU
An abbreviation for Multipoint Control
Unit. When connecting a MCU, a multipoint
videoconference can be held.
MLP
Data communication is also available during
communication of video/audio signals
between the videoconferencing systems.
The MLP or HMLP is a protocol for data
communication such as NetMeeting. Using
the HMLP protocol allows faster data
transmission.
PBX
An abbreviation for Private Branch
exchange.
P in P
An abbreviation for “Picture in Picture.”
This is a function which allows you to
monitor your own party on a small window
on your TV monitor.
QCIF
An abbreviation for Quater CIF. The number
of pixels is a quarter than one of CIF format.
176 pixels × 144 lines