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ITU-T T.61

1988 Edition, November 1, 1988

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Description / Abstract:


This Recommendation contains detailed definitions of the repertoires of graphic characters and control functions to be used in the basic international Teletex service, and their coded representations for communication. Additionally, the means are described whereby supplementary character repertoires and their coded representations may optionally be used.

In the Teletex service, control functions may be communicated as coded characters within the text or by means of the control procedures. This Recommendation defines the repertoire and coding of the former category.

The character repertoires and coded character sets for Teletex are not intended to replace International Alphabet No. 5 (IA5) or International Telegraph Alphabet No. 2 (ITA2). This Recommendation, based on Recommendation T.50, provides an extended alphabet for use in the international text communication service, Teletex. Where graphic characters of IA5 are not required for Teletex, their code table positions have been left unused, thereby assuring compatibility with IA5. The resulting subset of IA5 has been extended by the definition of additional graphic character sets.

The development of the coded character set defined in this Recommendation is based on the use of an 8-bit structure for the basic Teletex service.

This Recommendation should be read in conjunction with the following Recommendations:

T.60 – Terminal equipment for use in the Teletex service;

T.62 – Control procedures for Teletex and Groupe 4 Facsimile services;

F.200 – Teletex service.

The following Recommendations and ISO standards are related to this Recommendation, however, for the Teletex service this Recommendation only is relevant:

T.50 International Alphabet No. 5;

T.51 Coded character sets for the telematic services.

ISO 646 Information processing – ISO 7-bit coded character set for information interchange;

ISO 2022 Information processing – ISO 7-bit and 8-bit coded character sets – Code extension techniques;

ISO 6429 Information processing – ISO 7-bit and 8-bit coded character sets – Additional control functions for character imaging devices;

ISO 6937 Information processing – Coded character sets for text communication.

This Recommendation contains ordered lists of graphic characters and control functions forming the Teletex basic repertoire, together with the coded character sets necessary for their communication. For this purpose, the elements of the coded character sets are used either individually or in defined combinations.

The optional use of additional character repertoires is provided for, but the composition of such repertoires is not defined. Similarly, the code extension techniques for the representation of the additional repertoires are described in general, but no specific allocations of code tables are made.