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T.50 (standard)

From Wikipedia, the free encyclopedia

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-bit code. IA5 is an improvement, based on seven-bit 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  • Recommendation V.3 IA5 (1968): Initial version, superseded[1] [2]
  • Recommendation V.3 IA5 (1972): Superseded[1] [2]
  • Recommendation V.3 IA5 (1976-10): Superseded
  • Recommendation V.3 IA5 (1980-11): Superseded
  • Recommendation T.50 IA5 (1984-10): Superseded[2]
  • Recommendation T.50 IA5 (1988年11月25日): Superseded[1] [2]
  • Recommendation T.50 IRA (1992年09月18日): In force[1] [3]

Use

[edit ]

The IA5STRING string type in ASN.1 is restricted to characters in IA5.[4] This standard is referenced by other standards such as RFC 3939 ("Calling Line Identification for Voice Mail Messages"). It is also used by some analog modems such as Cisco ones.[5]

Character set

[edit ]

The following table shows the IA5 character set. Each character is shown with the code point of its Unicode equivalent.

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IA5 character set
0 1 2 3 4 5 6 7 8 9 A B C D E F
0x NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI
1x DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US
2x SP ! " # $ % & ' ( ) * + , - . /
3x 0 1 2 3 4 5 6 7 8 9 : ; < = > ?
4x @ A B C D E F G H I J K L M N O
5x P Q R S T U V W X Y Z [ \ ] ^ _
6x ` a b c d e f g h i j k l m n o
7x p q r s t u v w x y z { | } ~ DEL
Undefined, showing instead the ASCII character at that location)
A character that, in some regions, can be combined with a previous character as a diacritic using the backspace character, which may affect glyph choice.

Standardisation

[edit ]
  • Identical standard: ISO/IEC 646:1991 (Twinned)

See also

[edit ]

References

[edit ]
  1. 1 2 3 4 Salste, Tuomas (January 2016). "7-bit character sets: Revisions of ASCII". Aivosto Oy. urn:nbn:fi-fe201201011004. Archived from the original on 2016年06月13日. Retrieved 2016年06月13日.
  2. 1 2 3 4 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年04月16日 [1988年11月25日], E 33116, archived from the original on 2017年03月19日, retrieved 2017年03月18日
  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年04月16日 [1992年09月18日], E 3177, archived from the original on 2014年12月19日, retrieved 2017年03月18日
  4. ↑ Dubuisson, Olivier (2000). ASN.1 Communication Between Heterogeneous Systems. Morgan Kaufmann. p. 177. ISBN 978-0-12-633361-9 . Retrieved 2026年02月21日.
  5. ↑ "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. Archived from the original on 2011年09月07日. Retrieved 2012年10月03日.
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