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H.331 is part of the
ITU The International Telecommunication Union is a specialized agency of the United Nations responsible for many matters related to information and communication technologies. It was established on 17 May 1865 as the International Telegraph Union ...
suite of standards for Video Teleconferencing. This standard is used for broadcast of videoconferences, as opposed to point-to-point links."EBU Technical Review"
''EBU'', 1999. Retrieved 5 January 2012. A standard
H.320 H.320 or Narrow-band visual telephone systems and terminal equipment is an ''umbrella Recommendation'' by the ITU-T for running Multimedia (Audio/Video/Data) over ISDN based networks. The main protocols in this suite are H.221, H.230, H.242, a ...
terminal (i.e. ISDN endpoint) can be modified to provide one-way point-to-multipoint data transmissions ("broadcasts"). These broadcasts can be likened to television broadcasts. H.331 specifies how H.320 terminals act in situations where there is no data path from receivers back to transmitters, making normal two-way negotiation impossible. In such a situation no MCU is needed. Standard applications include: * Educational Broadcasts (Classes, Campus Events...) * Corporate Broadcasts (Shareholder Meetings, Public Relations...) * Political Broadcasts Often low-bit-rate digital satellite transmission is used for such services, with one uplink site sending H.320 video and many receiving stations.


References

http://www.tml.tkk.fi/Opinnot/Tik-111.590/2002/ Jerry D. Gibson (ed.), Multimedia Communications - Directions & Innovations, Academic Press, 2001 {{ISBN, 0-12-282160-2 Teleconferencing ITU-T recommendations