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A background/foreground operation was envisaged in teletex. Transmission/reception of messages should proceed in the background without affecting the work which the user might be carrying out in the foreground with the equipment. In other words, a user might be preparing a new document, while another
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were supported in teletex. The set of control characters helped in preparation and reproduction of documents. In particular, they permitted the positioning of the printing element, specification of page orientation, left and right margins, vertical spacing and the use of underlining. The page control
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Teletex was designed as an upgrade to the conventional telex service. The terminal-to-terminal communication service of telex would be turned into an office-to-office document transmission system by teletex. Teletex envisaged direct communication between
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Twenty four characters were used for source/destination ids, 14 characters for date and time stamp, and 7 characters for document reference which also specified the number of pages in the document. Destination/source ID consisted of four
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document was being transmitted or received. The teletex would also maintain compatibility with the present telex system and inter-operate with it. Telex procedures called for the exchange of
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The number of characters allotted to each of the above fields was variable, subject to a maximum for each field, the total being 24 characters.
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specification F.200 for a text and document communications service that could be provided over telephone lines. It was rapidly superseded by
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In addition to the standard character set, a rich set of graphic symbols and a comprehensive set of
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before the actual document transfer took place. The header information consisted of four parts:
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papers to be used for receiving messages instead of the
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133:TTX11 terminal, in this case being relabeled IBM
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288:"F.200 : Teletex service (withdrawn)"
117:Learn how and when to remove this message
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161:Lightweight Directory Access Protocol
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260:Field 2: National subscriber number,
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292:www.itu.int
383:Telegraphy
372:Categories
297:2022-10-28
274:References
107:April 2022
77:newspapers
253:Field 1:
66:"Teletex"
192:Features
167:Overview
22:Teletext
255:Country
208:A4 size
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