H.324 OVERVIEW
Multimedia Teleconferencing Standards
The ITU-T T.120, H.320, H.323, and H.324 standards comprise the core
technologies for multimedia teleconferencing.
The T.120 standards address Real Time Data Conferencing (Audiographics),
the H.320 standards address ISDN
Videoconferencing, the H.323 standard addresses Video (Audiovisual)
communication on Local Area Networks, and
the H.324 standard addresses video and audio communications over low
bitrate connections such as POTS modem
connections.
Each of these standards has been developed in accordance with the process
described above. The IMTC expects to
continue to contribute, through its members, to the future enhancement of
the standards to incorporate new
functionality and capabilities.
H.324 Overview
H.324 addresses and specifies a common method for sharing video, data, and
voice simultaneously using V.34 modem
connections over a single analog (POTS) telephone line. It also specifies
interoperability under these conditions, so
that videophones, for example, based on H.324 will be able to connect and
conduct a multimedia session.
Of the three ITU standards that address videoconferencing - H.324, H.323
and H.320 - H.324 has the broadest impact in
the marketplace because H.324 incorporates the most pervasive
communications facility - POTS - installed today on a
global basis. For reference, H.320 specifies videoconferencing over
circuit-switched media like ISDN and Switched 56,
while H.323 extends H.320 video to corporate intranets, LAN's and other
packet-switched networks. As a result, H.324
based products are expected to be prominent in the mass market/retail
segment, where PC's equipped with this
capability are already available.
The H.324 suite consists of five recommendations: H.324, H.223, H.245,
H.263 and G.723.1 (formally G.723). H.261 Video
Compression and T.120 Data is also specified. Table 1 summarizes and
briefly describes these recommendations and
their status in the ITU.
Table 1
Recommendation
Discription
Status (as of Oct. `98)
H.324
Defines a multimedia communication
terminal operating over the Switched
Telephone Network. It includes H.261,
T.120, and V.34.
Version 2 Approved 2/98
H.263
Defines video coding for low bit rate
communications (typically less than 64
Kbps).
Approved 3/96
H.223
Defines a Multiplexing protocol for
low bitrate multimedia terminals.
Approved 3/96, Annexes
A, B, & C
Approved 2/98
H.245
Defines control of communications
between multimedia terminals.
Version 2 Approved 7/97
G.723.1
Defines speech coding for multimedia
telecommunications transmitting at
5.3/6.3 Kbps.
Approved 3/96, Annexes
A, B, & C
Approved 11/96
Asosiasi Penyelenggara Jasa Internet Indonesia [APJII]
Indonesian Internet Service Provider Association
Grha Citra Caraka [GCC], TELKOM Bldg, Mezzanine Fl.
Jln Jend Gatot Subroto 52, Jakarta 12710 - INDONESIA
MAIN-NOC: http://www.iix.net.id [Network Access Point - NAP]
I: http://www.apjii.or.id
V:+62-21 526 8777
F:+62-21 526 8789
E: [EMAIL PROTECTED]
--
STOP-LANGGANAN: 'unsubscribe' ke: [EMAIL PROTECTED]
START-LANGGANAN: 'subscribe' ke: [EMAIL PROTECTED]
