| Rev | Author | # | Line |
|---|---|---|---|
| 7 | LawrenceDoliveiro | 1 | An [Acronym] for __ITU T__elecommunication Standardization Sector, formerly known as [CCITT]. ITU is an [Acronym] for [International Telecommunications Union | http://www.itu.int/]. |
| 3 | StuartYeates | 2 | |
| 5 | AristotlePagaltzis | 3 | 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. |
| 6 | PerryLorier | 4 | |
| 5 | 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. | ||
| 7 | LawrenceDoliveiro | 6 | |
| 7 | ITU-T standards currently in force are freely downloadable from [here|http://www.itu.int/rec/T-REC/e]. | ||
| 8 | LawrenceDoliveiro | 8 | |
| 9 | The ITU-T standards all start with a letter a dot and some numbers: | ||
| 10 | |||
| 11 | <?plugin OldStyleTable | ||
| 12 | |^__Letter__|^__Meaning__| | ||
| 13 | |A|Organization of the work of ITU-T | ||
| 14 | |B|Means of expression: definitions, symbols, classification | ||
| 15 | |C|General telecommunication statistics | ||
| 16 | |D|General tariff principles | ||
| 17 | |E|Overall network operation, telephone service, service operation and human factors | ||
| 18 | |F|Non-telephone telecommunication services | ||
| 19 | |G|Transmission systems and media, digital systems and networks | ||
| 20 | |H|Audiovisual and multimedia systems | ||
| 21 | |I|Integrated services digital network | ||
| 22 | |J|Cable networks and transmission of television, sound programme and other multimedia signals | ||
| 23 | |K|Protection against interference | ||
| 24 | |L|Construction, installation and protection of cables and other elements of outside plant | ||
| 25 | |M|TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits | ||
| 26 | |N|Maintenance: international sound programme and television transmission circuits | ||
| 27 | |O|Specifications of measuring equipment | ||
| 28 | |P|Telephone transmission quality, telephone installations, local line networks | ||
| 29 | |Q|Switching and signalling | ||
| 30 | |R|Telegraph transmission | ||
| 31 | |S|Telegraph services terminal equipment | ||
| 32 | |T|Terminals for telematic services | ||
| 33 | |U|Telegraph switching | ||
| 34 | |V|Data communication over the telephone network | ||
| 35 | |X|Data networks and open system communications | ||
| 36 | |Y|Global information infrastructure and Internet protocol aspects | ||
| 37 | |Z|Languages and general software aspects for telecommunication systems | ||
| 38 | ?> | ||
| 39 | |||
| 40 | |||
| 41 | Some well known standards: | ||
| 11 | LawrenceDoliveiro | 42 | ;G.711, G.728, G.729: audio codecs used for telephony. |
| 8 | LawrenceDoliveiro | 43 | ;G.992: The [ADSL] protocol standards |
| 11 | LawrenceDoliveiro | 44 | ;H.222: Also known as [MPEG]-2. |
| 8 | LawrenceDoliveiro | 45 | ;[H.323]: Video conferencing over packet radios |
| 9 | LawrenceDoliveiro | 46 | ;H.263, H.264: video codecs used with [MPEG]-4. |
| 47 | ;V.''xx'': Various MoDem standards | ||
| 48 | ;X.25: An old packet switched network. | ||
| 8 | LawrenceDoliveiro | 49 | ;X.500: The world wide directory service (DAP). It never took off, but [LDAP] is a direct descendant. |
| 10 | LawrenceDoliveiro | 50 | ;[X.509|X509]: Public key Certificates, often used for [SSL]. |
| 8 | LawrenceDoliveiro | 51 | |
| 52 | ---- | ||
| 53 | CategoryStandards |
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