Differences between version 11 and revision by previous author of ITU-T.
Other diffs: Previous Major Revision, Previous Revision, or view the Annotated Edit History
| Newer page: | version 11 | Last edited on Saturday, January 9, 2010 9:09:16 pm | by LawrenceDoliveiro | Revert |
| Older page: | version 6 | Last edited on Friday, August 20, 2004 12:19:03 am | by PerryLorier | Revert |
@@ -1,5 +1,53 @@
-An [Acronym] for __ITU T__elecommunication Standardization Sector. ITU is an [Acronym] for [International Telecommunications Union | http://www.itu.int/].
+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].
+
+----
+CategoryStandards
