ITU T.50

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ITU-T recommendation T.50 specifies the International Reference Alphabet (IRA), formerly International Alphabet No. 5 (IA5), a character encoding. ASCII is the U.S. variant of that character set.

The original version from November 1988 corresponds to ISO 646. The current version is from September 1992.

History[edit]

At the beginning was the International Telegraph Alphabet No. 2 (ITA2), a five bits code. IA5 is an improvement based on seven bits bytes.

  • Recommendation V.3 IA5 (1968) Initial version, superseded[1][2]
  • Recommendation V.3 IA5 (1972) Superseded[1][2]
  • Recommendation V.3 IA5 (1976-10) Superseded
  • Recommendation V.3 IA5 (1980-11) Superseded
  • Recommendation T.50 IA5 (1984-10) Superseded[2]
  • Recommendation T.50 IA5 (1988-11-25) Superseded[1][2]
  • Recommendation T.50 IRA (1992-09-18) In force[1][3]

Use[edit]

This standard is referenced by other standards such as RFC 3966.

It is also used by some analog modems such as Cisco ones.[4]

This standard is referenced by other standards such as RFC 3939 - Calling Line Identification for Voice Mail Messages.

Standardisation[edit]

  • Identical standard: ISO 646:1991 (Twinned)

See also[edit]

References[edit]

  1. ^ a b c d Salste, Tuomas (January 2016). "7-bit character sets: Revisions of ASCII". Aivosto Oy. urn:nbn:fi-fe201201011004. Archived from the original on 2016-06-13. Retrieved 2016-06-13. 
  2. ^ a b c d International Alphabet No. 5 - Recommendation T.50, International Telecommunication Union (ITU) - The International Telegraph and Telephone Consultative Committee (CCITT) - Series T: Terminal Equipment and Protocols for Telematic Services, 1993-04-16 [1988-11-25], E 33116, archived from the original on 2017-03-19, retrieved 2017-03-18 
  3. ^ International Reference Alphabet (IRA) - Information Technology - 7-bit Coded Character Set For Information Interchange - Recommendation T.50, International Telecommunication Union (ITU) - The International Telegraph and Telephone Consultative Committee (CCITT) - Terminal Equipment and Protocols for Telematic Services, 1993-04-16 [1992-09-18], E 3177, archived from the original on 2014-12-19, retrieved 2017-03-18 
  4. ^ "AT Command Set and Register Summary for NM-8AM-V2, NM-16AM-V2, WIC-1AM, and WIC-2AM Analog Modem WAN Interface Cards - 2: Syntax and Procedures [Cisco 3600 Series Multiservice Platforms] - Cisco Systems". Cisco.com. Retrieved 2012-10-03. 

External links[edit]