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Newer page: version 3 Last edited on Saturday, February 28, 2009 1:21:54 pm by LawrenceDoliveiro
Older page: version 2 Last edited on Saturday, February 28, 2009 1:15:41 pm by LawrenceDoliveiro Revert
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 the ITU are the group that standardises telecommunications protocols and standards. They have three types of major documents Technical standards ([ITU-T]), Radio Communications (ITU-R) and Design (ITU-D). 
-The ITU-T standards all start with a letter a dot and some numbers:  
-|A|Organization of the work of ITU-T  
-|B|Means of expression: definitions, symbols, classification  
-|C|General telecommunication statistics  
-|D|General tariff principles  
-|E|Overall network operation, telephone service, service operation and human factors  
-|F|Non-telephone telecommunication services  
-|G|Transmission systems and media, digital systems and networks  
-|H|Audiovisual and multimedia systems  
-|I|Integrated services digital network  
-|J|Cable networks and transmission of television, sound programme and other multimedia signals  
-|K|Protection against interference  
-|L|Construction, installation and protection of cables and other elements of outside plant  
-|M|TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits  
-|N|Maintenance: international sound programme and television transmission circuits  
-|O|Specifications of measuring equipment  
-|P|Telephone transmission quality, telephone installations, local line networks  
-|Q|Switching and signalling  
-|R|Telegraph transmission  
-|S|Telegraph services terminal equipment  
-|T|Terminals for telematic services  
-|U|Telegraph switching  
-|V|Data communication over the telephone network  
-|X|Data networks and open system communications  
-|Y|Global information infrastructure and Internet protocol aspects  
-|Z|Languages and general software aspects for telecommunication systems  
-Some well known standards:  
-;G.992: The [ADSL] protocol standards  
-;[H.323]: Video conferencing over packet radios  
-;V.''xx'': Various modem standards  
-;X.500: The world wide directory service (DAP). It never took off, but [LDAP] is a direct descendant.  
-;X.509: Public key Certificates, often used for [SSL].  
-;X.25: An old packet switched network.  
 See also [ITU-T].