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Acronym for International Telecomunication Union.

Website: http://www.itu.int/

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:

|^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.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.