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T.50 (standard)

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

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  • Recommendation V.3 IA5 (1968): Initial version, superseded
  • Recommendation V.3 IA5 (1972): Superseded
  • Recommendation V.3 IA5 (1976-10): Superseded
  • Recommendation V.3 IA5 (1980-11): Superseded
  • Recommendation T.50 IA5 (1984-10): Superseded
  • Recommendation T.50 IA5 (1988-11-25): Superseded{{citation|title=International Alphabet No. 5 - Recommendation T.50 |publisher=International Telecommunication Union (ITU) - The International Telegraph and Telephone Consultative Committee (CCITT) - Series T: Terminal Equipment and Protocols for Telematic Services |date=1993-04-16 |orig-year=1988-11-25 |id=E 33116 |url=https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-T.50-198811-S!!PDF-E&type=items |access-date=2017-03-18 |url-status=live |archive-url=https://web.archive.org/web/20170319173615/https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-T.50-198811-S%21%21PDF-E&type=items |archive-date=2017-03-19 }}
  • Recommendation T.50 IRA (1992-09-18): In force{{cite web |title=7-bit character sets: Revisions of ASCII |author-first=Tuomas |author-last=Salste |publisher=Aivosto Oy |date=January 2016 |id={{URN|nbn|fi-fe201201011004}} |url=http://www.aivosto.com/vbtips/charsets-7bit.html#body |access-date=2016-06-13 |url-status=live |archive-url=https://web.archive.org/web/20160613145224/http://www.aivosto.com/vbtips/charsets-7bit.html#body |archive-date=2016-06-13}}{{citation|title=International Reference Alphabet (IRA) - Information Technology - 7-bit Coded Character Set For Information Interchange - Recommendation T.50 |publisher=International Telecommunication Union (ITU) - The International Telegraph and Telephone Consultative Committee (CCITT) - Terminal Equipment and Protocols for Telematic Services |date=1993-04-16 |orig-year=1992-09-18 |id=E 3177 |url=https://www.itu.int/rec/recommendation.asp?lang=en&parent=T-REC-T.50-199209-I |access-date=2017-03-18 |url-status=live |archive-url=https://web.archive.org/web/20141219040010/https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-T.50-199209-I%21%21PDF-E&type=items |archive-date=2014-12-19 }}

Use

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.{{cite web |url=http://www.cisco.com/en/US/docs/routers/access/modem/AT/wic/command/reference/atwic2.html |title=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 |publisher=Cisco.com |access-date=2012-10-03 |url-status=dead |archiveurl=https://web.archive.org/web/20110907024347/http://www.cisco.com/en/US/docs/routers/access/modem/AT/wic/command/reference/atwic2.html |archivedate=2011-09-07 }}

Character set

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

{{chset-table-header1|IA5 character set}}
{{chset-left1|0x}}

| {{chset-ctrl1 | 0 U+0000: Control (alias NULL) (alias NUL) | NUL }}

| {{chset-ctrl1 | 1 U+0001: Control (alias START OF HEADING) (alias SOH) | SOH }}

| {{chset-ctrl1 | 2 U+0002: Control (alias START OF TEXT) (alias STX) | STX }}

| {{chset-ctrl1 | 3 U+0003: Control (alias END OF TEXT) (alias ETX) | ETX }}

| {{chset-ctrl1 | 4 U+0004: Control (alias END OF TRANSMISSION) (alias EOT) | EOT }}

| {{chset-ctrl1 | 5 U+0005: Control (alias ENQUIRY) (alias ENQ) | ENQ }}

| {{chset-ctrl1 | 6 U+0006: Control (alias ACKNOWLEDGE) (alias ACK) | ACK }}

| {{chset-ctrl1 | 7 U+0007: Control (alias ALERT) (alias BEL) | BEL }}

| {{chset-ctrl1 | 8 U+0008: Control (alias BACKSPACE) (alias BS) |  BS  }}

| {{chset-ctrl1 | 9 U+0009: Control (alias CHARACTER TABULATION) (alias HORIZONTAL TABULATION) (alias HT) (alias TAB) |  HT  }}

| {{chset-ctrl1 | 10 U+000A: Control (alias LINE FEED) (alias NEW LINE) (alias END OF LINE) (alias LF) (alias NL) (alias EOL) |  LF  }}

| {{chset-ctrl1 | 11 U+000B: Control (alias LINE TABULATION) (alias VERTICAL TABULATION) (alias VT) |  VT  }}

| {{chset-ctrl1 | 12 U+000C: Control (alias FORM FEED) (alias FF) |  FF  }}

| {{chset-ctrl1 | 13 U+000D: Control (alias CARRIAGE RETURN) (alias CR) |  CR  }}

| {{chset-ctrl1 | 14 U+000E: Control (alias SHIFT OUT) (alias LOCKING-SHIFT ONE) (alias SO) |  SO  }}

| {{chset-ctrl1 | 15 U+000F: Control (alias SHIFT IN) (alias LOCKING-SHIFT ZERO) (alias SI) |  SI   }}

{{chset-left1|1x}}

| {{chset-ctrl1 | 16 U+0010: Control (alias DATA LINK ESCAPE) (alias DLE) | DLE }}

| {{chset-ctrl1 | 17 U+0011: Control (alias DEVICE CONTROL ONE) (alias DC1) | DC1 }}

| {{chset-ctrl1 | 18 U+0012: Control (alias DEVICE CONTROL TWO) (alias DC2) | DC2 }}

| {{chset-ctrl1 | 19 U+0013: Control (alias DEVICE CONTROL THREE) (alias DC3) | DC3 }}

| {{chset-ctrl1 | 20 U+0014: Control (alias DEVICE CONTROL FOUR) (alias DC4) | DC4 }}

| {{chset-ctrl1 | 21 U+0015: Control (alias NEGATIVE ACKNOWLEDGE) (alias NAK) | NAK }}

| {{chset-ctrl1 | 22 U+0016: Control (alias SYNCHRONOUS IDLE) (alias SYN) | SYN }}

| {{chset-ctrl1 | 23 U+0017: Control (alias END OF TRANSMISSION BLOCK) (alias ETB) | ETB }}

| {{chset-ctrl1 | 24 U+0018: Control (alias CANCEL) (alias CAN) | CAN }}

| {{chset-ctrl1 | 25 U+0019: Control (alias END OF MEDIUM) (alias EOM) |  EM  }}

| {{chset-ctrl1 | 26 U+001A: Control (alias SUBSTITUTE) (alias SUB) | SUB }}

| {{chset-ctrl1 | 27 U+001B: Control (alias ESCAPE) (alias ESC) | ESC }}

| {{chset-ctrl1 | 28 U+001C: Control (alias INFORMATION SEPARATOR FOUR) (alias FILE SEPARATOR) (alias FS) |  FS  }}

| {{chset-ctrl1 | 29 U+001D: Control (alias INFORMATION SEPARATOR THREE) (alias GROUP SEPARATOR) (alias GS) |  GS  }}

| {{chset-ctrl1 | 30 U+001E: Control (alias INFORMATION SEPARATOR TWO) (alias RECORD SEPARATOR) (alias RS) |  RS  }}

| {{chset-ctrl1 | 31 U+001F: Control (alias INFORMATION SEPARATOR ONE) (alias UNIT SEPARATOR) (alias US) |  US  }}

{{chset-left1|2x}}

| {{chset-ctrl1 | 32 U+0020: SPACE (alias SP) |  SP  }}

| {{chset-cell1 | 33 U+0021: EXCLAMATION MARK | ! }}

| {{chset-cell1 | 34 U+0022: QUOTATION MARK | " | style=background:#FFD }}

| {{chset-cell1 | 35 U+0023: NUMBER SIGN | # | style=background:#DDD }}

| {{chset-cell1 | 36 U+0024: DOLLAR SIGN | $ | style=background:#DDD }}

| {{chset-cell1 | 37 U+0025: PERCENT SIGN | % }}

| {{chset-cell1 | 38 U+0026: AMPERSAND | & }}

| {{chset-cell1 | 39 U+0027: APOSTROPHE | ' | style=background:#FFD }}

| {{chset-cell1 | 40 U+0028: LEFT PARENTHESIS | ( }}

| {{chset-cell1 | 41 U+0029: RIGHT PARENTHESIS | ) }}

| {{chset-cell1 | 42 U+002A: ASTERISK | * }}

| {{chset-cell1 | 43 U+002B: PLUS SIGN | + }}

| {{chset-cell1 | 44 U+002C: COMMA | , | style=background:#FFD }}

| {{chset-cell1 | 45 U+002D: HYPHEN-MINUS | - }}

| {{chset-cell1 | 46 U+002E: FULL STOP | . }}

| {{chset-cell1 | 47 U+002F: SOLIDUS | / }}

{{chset-left1|3x}}

| {{chset-cell1 | 48 U+0030: DIGIT ZERO | 0 }}

| {{chset-cell1 | 49 U+0031: DIGIT ONE | 1 }}

| {{chset-cell1 | 50 U+0032: DIGIT TWO | 2 }}

| {{chset-cell1 | 51 U+0033: DIGIT THREE | 3 }}

| {{chset-cell1 | 52 U+0034: DIGIT FOUR | 4 }}

| {{chset-cell1 | 53 U+0035: DIGIT FIVE | 5 }}

| {{chset-cell1 | 54 U+0036: DIGIT SIX | 6 }}

| {{chset-cell1 | 55 U+0037: DIGIT SEVEN | 7 }}

| {{chset-cell1 | 56 U+0038: DIGIT EIGHT | 8 }}

| {{chset-cell1 | 57 U+0039: DIGIT NINE | 9 }}

| {{chset-cell1 | 58 U+003A: COLON | : }}

| {{chset-cell1 | 59 U+003B: SEMICOLON | ; }}

| {{chset-cell1 | 60 U+003C: LESS-THAN SIGN | < }}

| {{chset-cell1 | 61 U+003D: EQUALS SIGN | = }}

| {{chset-cell1 | 62 U+003E: GREATER-THAN SIGN | > }}

| {{chset-cell1 | 63 U+003F: QUESTION MARK | ? }}

{{chset-left1|4x}}

| {{chset-cell1 | 64 U+0040: COMMERCIAL AT | @ | style=background:#DDD }}

| {{chset-cell1 | 65 U+0041: LATIN CAPITAL LETTER A | A }}

| {{chset-cell1 | 66 U+0042: LATIN CAPITAL LETTER B | B }}

| {{chset-cell1 | 67 U+0043: LATIN CAPITAL LETTER C | C }}

| {{chset-cell1 | 68 U+0044: LATIN CAPITAL LETTER D | D }}

| {{chset-cell1 | 69 U+0045: LATIN CAPITAL LETTER E | E }}

| {{chset-cell1 | 70 U+0046: LATIN CAPITAL LETTER F | F }}

| {{chset-cell1 | 71 U+0047: LATIN CAPITAL LETTER G | G }}

| {{chset-cell1 | 72 U+0048: LATIN CAPITAL LETTER H | H }}

| {{chset-cell1 | 73 U+0049: LATIN CAPITAL LETTER I | I }}

| {{chset-cell1 | 74 U+004A: LATIN CAPITAL LETTER J | J }}

| {{chset-cell1 | 75 U+004B: LATIN CAPITAL LETTER K | K }}

| {{chset-cell1 | 76 U+004C: LATIN CAPITAL LETTER L | L }}

| {{chset-cell1 | 77 U+004D: LATIN CAPITAL LETTER M | M }}

| {{chset-cell1 | 78 U+004E: LATIN CAPITAL LETTER N | N }}

| {{chset-cell1 | 79 U+004F: LATIN CAPITAL LETTER O | O }}

{{chset-left1|5x}}

| {{chset-cell1 | 80 U+0050: LATIN CAPITAL LETTER P | P }}

| {{chset-cell1 | 81 U+0051: LATIN CAPITAL LETTER Q | Q }}

| {{chset-cell1 | 82 U+0052: LATIN CAPITAL LETTER R | R }}

| {{chset-cell1 | 83 U+0053: LATIN CAPITAL LETTER S | S }}

| {{chset-cell1 | 84 U+0054: LATIN CAPITAL LETTER T | T }}

| {{chset-cell1 | 85 U+0055: LATIN CAPITAL LETTER U | U }}

| {{chset-cell1 | 86 U+0056: LATIN CAPITAL LETTER V | V }}

| {{chset-cell1 | 87 U+0057: LATIN CAPITAL LETTER W | W }}

| {{chset-cell1 | 88 U+0058: LATIN CAPITAL LETTER X | X }}

| {{chset-cell1 | 89 U+0059: LATIN CAPITAL LETTER Y | Y }}

| {{chset-cell1 | 90 U+005A: LATIN CAPITAL LETTER Z | Z }}

| {{chset-cell1 | 91 U+005B: LEFT SQUARE BRACKET | [ | style=background:#DDD }}

| {{chset-cell1 | 92 U+005C: REVERSE SOLIDUS | \ | style=background:#DDD }}

| {{chset-cell1 | 93 U+005D: RIGHT SQUARE BRACKET | ] | style=background:#DDD }}

| {{chset-cell1 | 94 U+005E: CIRCUMFLEX ACCENT | ^ | style=background:#DDA }}

| {{chset-cell1 | 95 U+005F: LOW LINE | _ | style=background:#FFD }}

{{chset-left1|6x}}

| {{chset-cell1 | 96 U+0060: GRAVE ACCENT | ` | style=background:#DDA }}

| {{chset-cell1 | 97 U+0061: LATIN SMALL LETTER A | a }}

| {{chset-cell1 | 98 U+0062: LATIN SMALL LETTER B | b }}

| {{chset-cell1 | 99 U+0063: LATIN SMALL LETTER C | c }}

| {{chset-cell1 | 100 U+0064: LATIN SMALL LETTER D | d }}

| {{chset-cell1 | 101 U+0065: LATIN SMALL LETTER E | e }}

| {{chset-cell1 | 102 U+0066: LATIN SMALL LETTER F | f }}

| {{chset-cell1 | 103 U+0067: LATIN SMALL LETTER G | g }}

| {{chset-cell1 | 104 U+0068: LATIN SMALL LETTER H | h }}

| {{chset-cell1 | 105 U+0069: LATIN SMALL LETTER I | i }}

| {{chset-cell1 | 106 U+006A: LATIN SMALL LETTER J | j }}

| {{chset-cell1 | 107 U+006B: LATIN SMALL LETTER K | k }}

| {{chset-cell1 | 108 U+006C: LATIN SMALL LETTER L | l }}

| {{chset-cell1 | 109 U+006D: LATIN SMALL LETTER M | m }}

| {{chset-cell1 | 110 U+006E: LATIN SMALL LETTER N | n }}

| {{chset-cell1 | 111 U+006F: LATIN SMALL LETTER O | o }}

{{chset-left1|7x}}

| {{chset-cell1 | 112 U+0070: LATIN SMALL LETTER P | p }}

| {{chset-cell1 | 113 U+0071: LATIN SMALL LETTER Q | q }}

| {{chset-cell1 | 114 U+0072: LATIN SMALL LETTER R | r }}

| {{chset-cell1 | 115 U+0073: LATIN SMALL LETTER S | s }}

| {{chset-cell1 | 116 U+0074: LATIN SMALL LETTER T | t }}

| {{chset-cell1 | 117 U+0075: LATIN SMALL LETTER U | u }}

| {{chset-cell1 | 118 U+0076: LATIN SMALL LETTER V | v }}

| {{chset-cell1 | 119 U+0077: LATIN SMALL LETTER W | w }}

| {{chset-cell1 | 120 U+0078: LATIN SMALL LETTER X | x }}

| {{chset-cell1 | 121 U+0079: LATIN SMALL LETTER Y | y }}

| {{chset-cell1 | 122 U+007A: LATIN SMALL LETTER Z | z }}

| {{chset-cell1 | 123 U+007B: LEFT CURLY BRACKET | { | style=background:#DDD }}

| {{chset-cell1 | 124 U+007C: VERTICAL LINE | {{pipe}} | style=background:#DDD }}

| {{chset-cell1 | 125 U+007D: RIGHT CURLY BRACKET | Right curly bracket

| style=background:#DDD }}

| {{chset-cell1 | 126 U+007E: TILDE | ~ | style=background:#DDA }}

| {{chset-ctrl1 | 127 U+007F: Control (alias DELETE) (alias DEL) | DEL }}

|}

{{legend|#DDD|Undefined, showing instead the ASCII character at that location)}}

{{legend|#FFD|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

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

See also

References

{{reflist}}

External links

  • [http://www.itu.int/rec/T-REC-T.50/en Official ITU-T T.50 page]
  • [http://www.zytrax.com/tech/ia5.html Tech Info - Character Codes (IA5 and ISO 646)]

Category:Character encoding

Category:Character sets

Category:ITU-T recommendations

Category:ITU-T T Series Recommendations