ITU-T
The '''ITU Telecommunication Mosquito ringtone Standardization Sector''' ('''ITU-T''') coordinates standards for telecommunications on behalf of the Sabrina Martins International Telecommunication Union (ITU).
It was formed in 1993 to replace the '''International Telegraph and Telephone Consultative Committee''' ('''CCITT''', from the French name "'''Comité Consultatif International Téléphonique et Télégraphique'''").
The sector divides its work into categories that are each identified by a single letter, referred to as the "series" (see below), and recommendations are numbered within each series, for example "V.90".
Since 1960, the recommendations were presented to four-yearly "plenary assemblies" for endorsement, and the full set of recommendations were published after each plenary assembly, in a set of volumes titled collectively for the colour of their covers. For example the publication after the 1980 plenary session was the ''Yellow Book'' while that after 1984 was the ''Red Book''. These publications were divided into "fascicles" of several hundred pages that could be bought separately.
A standard that has been amended retains its designation so that, for example, in the mid-1980s, terminal equipment for connection to an X.25 (packet switched) network might need alternatives depending on whether the network implemented the 1980 (''Yellow Book'') or the 1984 (''Red Book'') version of the standard.
A standard can be developed that extends or is complementary to an existing one rather than replacing it. Such a standard is designated by the suffix "bis" or "ter" added to the base standard name, for example "V.26 bis" and "V.26 ter".
Series and Recommendations
ITU-T issues recommendations that have names like Nextel ringtones X.500, where X is the series and 500 is a serial number.
See Abbey Diaz :Tag: ITU-T recommendations.
Significant ITU-T series and recommendations are:
*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
**Free ringtones E.123 Notation for national and international telephone numbers
**Majo Mills E.163 Numbering plan for the international telephone service
**Mosquito ringtone E.164 The international public telecommunication numbering plan
*** Supplement 2 - Number Portability
*F - Non-telephone telecommunication services
*G - Transmission systems and media, digital systems and networks
**Sabrina Martins G.711 Audio compression (mu-law)
**Nextel ringtones G.722 Audio compression (wideband)
**Abbey Diaz G.722.1 Audio compression (wideband, lower bit rates)
**Cingular Ringtones G.722.2 Speech compression reina m AMR-WB (wideband, lower bit rates)
**reproductions and G.723.1 Speech compression purchasing glossy CELP
**compliments this G.726 Audio compression no vile ADPCM
**alert snake G.728 Speech compression hopeless enterprise LD-CELP
**guides below G.729 Speech compression first anglican ACELP
*H - Audiovisual and multimedia systems
**journalist jim H.223 Multiplexing protocol for low bit rate multimedia communication
**bullish stock H.225.0 Also known as underlying structure Real-time Transport Protocol/RTP
**attacks i H.261 Video compression standard, circa 1991
**abc problems H.262 Video compression standard (common text with part 2 of ordering hardly MPEG-2), circa 1994
**export policy H.263 Video compression standard, circa 1995
**the generations H.263v2 (a.k.a. H.263+) Video compression standard, circa 1998
**doubt whatsoever H.264 Video compression standard (technically aligned with porta nuova MPEG-4 part 10), circa 2003
**yukos oil H.323 Packet-based multimedia communications systems
*** Annex D - Real-time facsimile over H.323 systems
*** Annex G - Text conversation and Text SET
*** Annex J - Security for H.323 Annex F
*** Annex K - HTTP based service control transport channel in H.323
*** Annex M.1 - Tunnelling of signalling protocol (Qsig) in H.323
*** Annex M.2 - Tunnelling of signalling protocol (Isup) in H.323
**H.324 Terminal for low bit-rate multimedia communication
**H.332 H.323 extended for loosely coupled conferences
*I - Integrated services digital network (Integrated Services Digital Network/ISDN)
*J - 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
**Open Document Architecture/T.411 - T.424 Comprise the Open Document Architecture (ODA and ODIF), a standardized document file format
*U - Telegraph switching
*V - Data communication over the telephone network
**V.1 Equivalence between binary notation symbols and the significant conditions of a two-condition code.
**V.5 Standard that synchronous data signalling rates should be 600, 1200, 2400, 4800 and 9600 bit/s, to within better than 0.01%.
**V.10 A recommendation, first agreed in 1976, for unbalanced electrical circuits for data communication at up to 100 Bit rate/kbit/s.
**V.11 A recommendation, first agreed in 1976, for Balanced line/balanced electrical circuits for data communication at up to 10 Bit rate/Mbit/s.
**V.17 A fax protocol that uses Trellis_modulation/TCM modulation at 12 and 14.4 Bit rate/kbit/s.
**V.21 A recommendation for full duplex/full-duplex communication between two analogue dial-up modems using Audio frequency-shift keying/AFSK modulation at 300 bauds to carry data at 300 Bit rate/bit/s.
**V.22 A recommendation for full duplex/full-duplex communication between two analogue dial-up modems using Phase-shift keying/PSK modulation at 600 bauds to carry data at 1200 or 600 Bit rate/bit/s.
**V.22bis/V.22 bis An extension of V.22 using Quadrature_amplitude_modulation/QAM modulation at 600 bauds to carry data at 2400 or 1200 Bit rate/bit/s, with fall-back to V.22 mode.
**V.23 A recommendation for half-duplex communication between two analogue dial-up modems using frequency-shift keying/FSK modulation at up to 600 or 1200 bauds to carry digital data at up to 600 or 1200 Bit rate/bit/s respectively. An optional 75 bauds reverse channel carries 75 bit/s.
**V.24 A list of definitions for interchange circuits between data terminal equipment (DTE) and data circuit terminating equipment (DCE), first agreed in 1964. This is equivalent to a subset of EIA RS-232/RS 232: for the electrical and physical details, see V.28 and others.
**V.25 A recommendation, first agreed in 1968, for automatic calling and/or answering equipment on dial-up lines, using interchange circuits defined in V.24 specifically for parallel automatic calling. It includes procedures for disabling network echo cancellers and suppressors.
**V.25/V.25 bis An extension of V.25 using the serial interchange circuits defined in V.24 for normal data transfer. Command formats are defined for asynchronous, and synchronous character- or bit-oriented (HDLC) operation.
**V.26 A recommendation, first agreed in 1968, for full duplex/full-duplex communication between two analogue fixed-line modems using Phase-shift keying/PSK modulation at 1200 bauds to carry synchronous data at 2400 Bit rate/bit/s. An optional 75 bauds reverse channel carries 75 bit/s in either direction.
**V.26/V.26 bis An extension of V.26, first agreed in 1972, for half-duplex operation of dial-up modems, adding a fall-back rate of 1200 Bit rate/bit/s (still at 1200 bauds).
**V.26/V.26 ter An extension of V.26, first agreed in 1984, for full duplex/full-duplex fixed-line or dial-up operation to carry synchronous or asynchronous data with a fall-back rate of 1200 Bit rate/bit/s (at 1200 bauds), separating channels by echo cancellation.
**V.27 A recommendation, first agreed in 1972, for full duplex/full- or half-duplex communication between two analogue fixed-line modems using PSK modulation at 1600 bauds to carry synchronous data at 4800 Bit rate/bit/s. An optional 75 bauds reverse channel carries 75 bit/s.
**V.27/V.27 bis An extension of V.27, first agreed in 1976, adding a fall-back modulation rate, compatible with V.26, of 1200 bauds to carry data at 2400 Bit rate/bit/s. An adaptive equalizer is included to handle lower grade lines.
**V.27/V.27 ter An extension of V.27/V.27 bis for use on dial-up lines.
**V.28 A recommendation, first agreed in 1972, for unbalanced electrical circuits for data communication. Together with the circuit specifications of V.24 and the 25-pin connector and pin assignments of IS 2110, this is compatible with EIA RS-232/RS 232.
**V.29 A recommendation, first agreed in 1976, for full-duplex communication between two analogue fixed-line modems using Quadrature amplitude modulation/QAM modulation at 2400 bauds to carry synchronous data at 9600 Bit rate/bit/s. Fallback rates of 7200 and 4800 bit/s use 2400 bauds at reduced modulations. Multiplexing of 7200, 4800 and 2400 bit/s subchannels up to an aggregate rate of 9600 bit/s is optional. An adaptation of this standard is used for facsimile (fax) transmission.
**V.32 A recommendation, first agreed in 1984, for a family of duplex analogue dial-up or fixed-line modems using Quadrature amplitude modulation/QAM modulation at 2400 bauds to carry data at 9600/4800/2400 bit/s.
**V.32/V.32 bis A duplex modem operating at data signalling rates of up to '''14 400''' bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits, with fallback to 12000 bits/s. This standard was improved on by modem manufacturers to create the V.terbo adhoc standard, signalling at 19,2 kb/s, as suggestive of a V.32ter standard that never materialized.
**V.34 is the ITU-T standard for full-duplex data communications up to '''28,800''' bit/s with fallback to lower speeds depending on the remote modem and the conditions of the phone line. This standard was known informally as V.Fast, hence pre-standard modems called V.FC (V.FastClass).
**V.34+ (aka V.34 bis) A communications protocol for full-duplex datacommunications up to '''33,6 kb/s''' between two analog modems on dial-up lines.
**V.42 Error correction protocol
**V.42bis/V.42 bis Data compression procedures for data circuit terminating equipment (DCE) using error correction procedures to try to ensure the transfer of error-free data, even over the noisiest telephone lines. Ratified by CCITT in January 1990.
**V.44 Data compression protocol
**V.90 A digital modem and analogue modem pair for use on the Public Switched Telephone Network (PSTN) at data signalling rates of up to '''56 000''' bit/s downstream and up to 33 600 bit/s upstream, using PCM encoding downstream, and QAM encoding upstream. V.90 Mode 2 used PCM upstream as well. This standard was known informally as V.Last and some pre-standard modems indicate V.Last compatibility or upgradeability. Prior to the arrival of the standard, there were two competing industry standards for 56 kbit/s downstream signalling, X2 and K56flex. K56flex itself is a merged standard of K56 and 56flex.
**V.92 A digital modem and analog modem pair for use on POTS at data signalling rates of up to '''56 kbit/s''' downstream and up to '''48 kbit/s''' upstream, using PCM encoding both ways, supporting Modem-on-Hold technology. This is a development of V.90 Mode 2.
*X - Data networks and open system communication
**X.1 International user classes of service in, and categories of access to, public data networks and Integrated Services Digital Networks (ISDNs)
**X.21 Interface between Data Terminal Equipment and Data Circuit-terminating Equipment for synchronous operation on public data networks
**X.25 Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit
**X.110 International routing principles and routing plan for public data networks
**X.121 International numbering plan for public data networks
**X.200 Information technology - Open Systems Interconnection - Basic Reference Model: The basic model
**X.208 Specification of Abstract Syntax Notation One (ASN.1)
**X.209 Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1)
**X.400 Message handling services: Message handling system and service overview
**X.500 Information technology - Open Systems Interconnection - The Directory: Overview of concepts, models and services Common text with ISO/IEC
**X.509 Information technology - Open Systems Interconnection - The Directory: Public-key and attribute public key certificate/certificate frameworks
**X.520 Information technology Open Systems Interconnection The Directory - Selected Attribute Types
**X.521 Information technology Open Systems Interconnection The Directory - Selected Object Classes
*Y - Global information infrastructure and Internet protocol aspects
*Z - Languages and general software aspects for telecommunication systems
AAA
See also
* Other specifications which are numbered similar to ITU-T recommendations, but are not products of ITU-T, include:
**X10 Interface between Home Automation devices
**Electronic Data Interchange ANSI Standard
**ITU-R recommendations, such as M.1457
External links
*http://www.itu.int/ITU-T/
Tag: Standards organizations
ca:CCITT
da:International Telecommunication Union, Telecommunication standardization sector
de:Comité Consultatif International Téléphonique et Télégraphique
es:CCITT
nl:ITU-T
ja:ITU-T
sv:CCITT
It was formed in 1993 to replace the '''International Telegraph and Telephone Consultative Committee''' ('''CCITT''', from the French name "'''Comité Consultatif International Téléphonique et Télégraphique'''").
The sector divides its work into categories that are each identified by a single letter, referred to as the "series" (see below), and recommendations are numbered within each series, for example "V.90".
Since 1960, the recommendations were presented to four-yearly "plenary assemblies" for endorsement, and the full set of recommendations were published after each plenary assembly, in a set of volumes titled collectively for the colour of their covers. For example the publication after the 1980 plenary session was the ''Yellow Book'' while that after 1984 was the ''Red Book''. These publications were divided into "fascicles" of several hundred pages that could be bought separately.
A standard that has been amended retains its designation so that, for example, in the mid-1980s, terminal equipment for connection to an X.25 (packet switched) network might need alternatives depending on whether the network implemented the 1980 (''Yellow Book'') or the 1984 (''Red Book'') version of the standard.
A standard can be developed that extends or is complementary to an existing one rather than replacing it. Such a standard is designated by the suffix "bis" or "ter" added to the base standard name, for example "V.26 bis" and "V.26 ter".
Series and Recommendations
ITU-T issues recommendations that have names like Nextel ringtones X.500, where X is the series and 500 is a serial number.
See Abbey Diaz :Tag: ITU-T recommendations.
Significant ITU-T series and recommendations are:
*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
**Free ringtones E.123 Notation for national and international telephone numbers
**Majo Mills E.163 Numbering plan for the international telephone service
**Mosquito ringtone E.164 The international public telecommunication numbering plan
*** Supplement 2 - Number Portability
*F - Non-telephone telecommunication services
*G - Transmission systems and media, digital systems and networks
**Sabrina Martins G.711 Audio compression (mu-law)
**Nextel ringtones G.722 Audio compression (wideband)
**Abbey Diaz G.722.1 Audio compression (wideband, lower bit rates)
**Cingular Ringtones G.722.2 Speech compression reina m AMR-WB (wideband, lower bit rates)
**reproductions and G.723.1 Speech compression purchasing glossy CELP
**compliments this G.726 Audio compression no vile ADPCM
**alert snake G.728 Speech compression hopeless enterprise LD-CELP
**guides below G.729 Speech compression first anglican ACELP
*H - Audiovisual and multimedia systems
**journalist jim H.223 Multiplexing protocol for low bit rate multimedia communication
**bullish stock H.225.0 Also known as underlying structure Real-time Transport Protocol/RTP
**attacks i H.261 Video compression standard, circa 1991
**abc problems H.262 Video compression standard (common text with part 2 of ordering hardly MPEG-2), circa 1994
**export policy H.263 Video compression standard, circa 1995
**the generations H.263v2 (a.k.a. H.263+) Video compression standard, circa 1998
**doubt whatsoever H.264 Video compression standard (technically aligned with porta nuova MPEG-4 part 10), circa 2003
**yukos oil H.323 Packet-based multimedia communications systems
*** Annex D - Real-time facsimile over H.323 systems
*** Annex G - Text conversation and Text SET
*** Annex J - Security for H.323 Annex F
*** Annex K - HTTP based service control transport channel in H.323
*** Annex M.1 - Tunnelling of signalling protocol (Qsig) in H.323
*** Annex M.2 - Tunnelling of signalling protocol (Isup) in H.323
**H.324 Terminal for low bit-rate multimedia communication
**H.332 H.323 extended for loosely coupled conferences
*I - Integrated services digital network (Integrated Services Digital Network/ISDN)
*J - 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
**Open Document Architecture/T.411 - T.424 Comprise the Open Document Architecture (ODA and ODIF), a standardized document file format
*U - Telegraph switching
*V - Data communication over the telephone network
**V.1 Equivalence between binary notation symbols and the significant conditions of a two-condition code.
**V.5 Standard that synchronous data signalling rates should be 600, 1200, 2400, 4800 and 9600 bit/s, to within better than 0.01%.
**V.10 A recommendation, first agreed in 1976, for unbalanced electrical circuits for data communication at up to 100 Bit rate/kbit/s.
**V.11 A recommendation, first agreed in 1976, for Balanced line/balanced electrical circuits for data communication at up to 10 Bit rate/Mbit/s.
**V.17 A fax protocol that uses Trellis_modulation/TCM modulation at 12 and 14.4 Bit rate/kbit/s.
**V.21 A recommendation for full duplex/full-duplex communication between two analogue dial-up modems using Audio frequency-shift keying/AFSK modulation at 300 bauds to carry data at 300 Bit rate/bit/s.
**V.22 A recommendation for full duplex/full-duplex communication between two analogue dial-up modems using Phase-shift keying/PSK modulation at 600 bauds to carry data at 1200 or 600 Bit rate/bit/s.
**V.22bis/V.22 bis An extension of V.22 using Quadrature_amplitude_modulation/QAM modulation at 600 bauds to carry data at 2400 or 1200 Bit rate/bit/s, with fall-back to V.22 mode.
**V.23 A recommendation for half-duplex communication between two analogue dial-up modems using frequency-shift keying/FSK modulation at up to 600 or 1200 bauds to carry digital data at up to 600 or 1200 Bit rate/bit/s respectively. An optional 75 bauds reverse channel carries 75 bit/s.
**V.24 A list of definitions for interchange circuits between data terminal equipment (DTE) and data circuit terminating equipment (DCE), first agreed in 1964. This is equivalent to a subset of EIA RS-232/RS 232: for the electrical and physical details, see V.28 and others.
**V.25 A recommendation, first agreed in 1968, for automatic calling and/or answering equipment on dial-up lines, using interchange circuits defined in V.24 specifically for parallel automatic calling. It includes procedures for disabling network echo cancellers and suppressors.
**V.25/V.25 bis An extension of V.25 using the serial interchange circuits defined in V.24 for normal data transfer. Command formats are defined for asynchronous, and synchronous character- or bit-oriented (HDLC) operation.
**V.26 A recommendation, first agreed in 1968, for full duplex/full-duplex communication between two analogue fixed-line modems using Phase-shift keying/PSK modulation at 1200 bauds to carry synchronous data at 2400 Bit rate/bit/s. An optional 75 bauds reverse channel carries 75 bit/s in either direction.
**V.26/V.26 bis An extension of V.26, first agreed in 1972, for half-duplex operation of dial-up modems, adding a fall-back rate of 1200 Bit rate/bit/s (still at 1200 bauds).
**V.26/V.26 ter An extension of V.26, first agreed in 1984, for full duplex/full-duplex fixed-line or dial-up operation to carry synchronous or asynchronous data with a fall-back rate of 1200 Bit rate/bit/s (at 1200 bauds), separating channels by echo cancellation.
**V.27 A recommendation, first agreed in 1972, for full duplex/full- or half-duplex communication between two analogue fixed-line modems using PSK modulation at 1600 bauds to carry synchronous data at 4800 Bit rate/bit/s. An optional 75 bauds reverse channel carries 75 bit/s.
**V.27/V.27 bis An extension of V.27, first agreed in 1976, adding a fall-back modulation rate, compatible with V.26, of 1200 bauds to carry data at 2400 Bit rate/bit/s. An adaptive equalizer is included to handle lower grade lines.
**V.27/V.27 ter An extension of V.27/V.27 bis for use on dial-up lines.
**V.28 A recommendation, first agreed in 1972, for unbalanced electrical circuits for data communication. Together with the circuit specifications of V.24 and the 25-pin connector and pin assignments of IS 2110, this is compatible with EIA RS-232/RS 232.
**V.29 A recommendation, first agreed in 1976, for full-duplex communication between two analogue fixed-line modems using Quadrature amplitude modulation/QAM modulation at 2400 bauds to carry synchronous data at 9600 Bit rate/bit/s. Fallback rates of 7200 and 4800 bit/s use 2400 bauds at reduced modulations. Multiplexing of 7200, 4800 and 2400 bit/s subchannels up to an aggregate rate of 9600 bit/s is optional. An adaptation of this standard is used for facsimile (fax) transmission.
**V.32 A recommendation, first agreed in 1984, for a family of duplex analogue dial-up or fixed-line modems using Quadrature amplitude modulation/QAM modulation at 2400 bauds to carry data at 9600/4800/2400 bit/s.
**V.32/V.32 bis A duplex modem operating at data signalling rates of up to '''14 400''' bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits, with fallback to 12000 bits/s. This standard was improved on by modem manufacturers to create the V.terbo adhoc standard, signalling at 19,2 kb/s, as suggestive of a V.32ter standard that never materialized.
**V.34 is the ITU-T standard for full-duplex data communications up to '''28,800''' bit/s with fallback to lower speeds depending on the remote modem and the conditions of the phone line. This standard was known informally as V.Fast, hence pre-standard modems called V.FC (V.FastClass).
**V.34+ (aka V.34 bis) A communications protocol for full-duplex datacommunications up to '''33,6 kb/s''' between two analog modems on dial-up lines.
**V.42 Error correction protocol
**V.42bis/V.42 bis Data compression procedures for data circuit terminating equipment (DCE) using error correction procedures to try to ensure the transfer of error-free data, even over the noisiest telephone lines. Ratified by CCITT in January 1990.
**V.44 Data compression protocol
**V.90 A digital modem and analogue modem pair for use on the Public Switched Telephone Network (PSTN) at data signalling rates of up to '''56 000''' bit/s downstream and up to 33 600 bit/s upstream, using PCM encoding downstream, and QAM encoding upstream. V.90 Mode 2 used PCM upstream as well. This standard was known informally as V.Last and some pre-standard modems indicate V.Last compatibility or upgradeability. Prior to the arrival of the standard, there were two competing industry standards for 56 kbit/s downstream signalling, X2 and K56flex. K56flex itself is a merged standard of K56 and 56flex.
**V.92 A digital modem and analog modem pair for use on POTS at data signalling rates of up to '''56 kbit/s''' downstream and up to '''48 kbit/s''' upstream, using PCM encoding both ways, supporting Modem-on-Hold technology. This is a development of V.90 Mode 2.
*X - Data networks and open system communication
**X.1 International user classes of service in, and categories of access to, public data networks and Integrated Services Digital Networks (ISDNs)
**X.21 Interface between Data Terminal Equipment and Data Circuit-terminating Equipment for synchronous operation on public data networks
**X.25 Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit
**X.110 International routing principles and routing plan for public data networks
**X.121 International numbering plan for public data networks
**X.200 Information technology - Open Systems Interconnection - Basic Reference Model: The basic model
**X.208 Specification of Abstract Syntax Notation One (ASN.1)
**X.209 Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1)
**X.400 Message handling services: Message handling system and service overview
**X.500 Information technology - Open Systems Interconnection - The Directory: Overview of concepts, models and services Common text with ISO/IEC
**X.509 Information technology - Open Systems Interconnection - The Directory: Public-key and attribute public key certificate/certificate frameworks
**X.520 Information technology Open Systems Interconnection The Directory - Selected Attribute Types
**X.521 Information technology Open Systems Interconnection The Directory - Selected Object Classes
*Y - Global information infrastructure and Internet protocol aspects
*Z - Languages and general software aspects for telecommunication systems
AAA
See also
* Other specifications which are numbered similar to ITU-T recommendations, but are not products of ITU-T, include:
**X10 Interface between Home Automation devices
**Electronic Data Interchange ANSI Standard
**ITU-R recommendations, such as M.1457
External links
*http://www.itu.int/ITU-T/
Tag: Standards organizations
ca:CCITT
da:International Telecommunication Union, Telecommunication standardization sector
de:Comité Consultatif International Téléphonique et Télégraphique
es:CCITT
nl:ITU-T
ja:ITU-T
sv:CCITT
posted @ 5:52 PM
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