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T.61 is an ITU-T Recommendation for a Teletex character set. T.61 predated Unicode,
and was the primary character set in ASN.1 used in early versions of X.500 and X.509
for encoding strings containing characters used in Western European languages.[1] While T.61 continues to be supported in modern versions of X.500 and X.509, it has been deprecated in favor of Unicode. It is also called Code page 1036, CP1036, or IBM 01036.
While ASN.1 does see wide use and the T.61 character set is used on some standards using ASN.1 (for example in RSA Security's PKCS #9), the 1988-11 version of the T.61 standard itself was superseded by a never-published 1993-03 version; the 1993-03 version was withdrawn by the ITU-T.[2] The 1988-11 version is still available.[2]
^ abThe ISO/IEC 2022 C0 control set defined by T.61 (ISO-IR-106) encodes SS2 and SS3 at 0x19 and 0x1D respectively.[4] It is permitted to use ISO/IEC 2022 sequences for switching control sets (as opposed to graphical sets) within ISO/IEC 10646 (UCS/Unicode) in contexts where processing ANSI escape codes is appropriate, provided that each byte in the sequence is padded to the code unit size of the encoding,[7] in which case SS2 and SS3 would be available at U+0019 and U+001D. However, the more common ISO/IEC 6429 control set, the names of which are listed for reference in the Unicode code chart,[8] encodes SS2 and SS3 at U+008E and U+008F respectively.
^Noted in the 1988 revision of the specification as having been allocated to the umlaut in the 1980 revision of the specification, but having since been deprecated.[3] It was initially used to distinguish between umlaut and diaeresis.[9]
^ITU-T (1994-11-11). "Table C.9/T.101 – The supplementary set of graphic characters (default G2 set)". International interworking for Videotex services. p. 248. T.101:1994. (Difference between the codes is explained in the first note below table. Caveats: Is in second of the segmented PDFs in the download. The table itself is displayed in the PDF with severe mojibake (hence why the displayed table does not appear to correspond to the notes), and is supposed to look roughly like this.
