Teletex

Teletex was ITU-T specification F.200[1] for a text and document communications service that could be provided over telephone lines.

It was rapidly superseded by e-mail; however, the name Teletex lives on in several of the X.500 standard attributes used in Lightweight Directory Access Protocol.

The terminal-to-terminal communication service of telex would be turned into an office-to-office document transmission system by teletex.

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 feature allowed standard A4 size papers to be used for receiving messages instead of the continuous stationery used in conventional telex systems.