View Source: ITU-T - Waikato Linux Users Group

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An [Acronym] for __ITU T__elecommunication Standardization Sector, formerly known as [CCITT]. ITU is an [Acronym] for [International Telecommunications Union | http://www.itu.int/].

The [ITU-T | http://www.itu.int/ITU-T/] is responsible for the [X509] and [H.323] standards in the computing world, as well as lots of things to do with [POTS] standards and interoperability.

ITU specifications are horrible to read, they refer all over the place to each other, and feel like they should be read by a computer.  Thing is, many of them are designed to be parsed by an [ASN.1] parser.

ITU-T standards currently in force are freely downloadable from [here|http://www.itu.int/rec/T-REC/e].

The ITU-T standards all start with a letter a dot and some numbers:

<?plugin OldStyleTable
|^__Letter__|^__Meaning__|
|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.711, G.728, G.729: audio codecs used for telephony.
;G.992: The [ADSL] protocol standards
;H.222: Also known as [MPEG]-2.
;[H.323]: Video conferencing over packet radios
;H.263, H.264: video codecs used with [MPEG]-4.
;V.''xx'': Various MoDem standards
;X.25: An old packet switched network.
;X.500: The world wide directory service (DAP).  It never took off, but [LDAP] is a direct descendant.
;[X.509|X509]: Public key Certificates, often used for [SSL].

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CategoryStandards
8 pages link to ITU-T:
Last edited on Saturday, January 9, 2010 9:09:16 pm by LawrenceDoliveiro
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