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teletex A means of low- to medium-speed text transmission, from keyboard to printer, over public data networks. Transmission speeds can range from 2.4 Kbps (using circuit switching) to 48 Kbps (using packet switching), as against 50 bps for telex. It permits a more extensive character set than telex, and permits line and paragraph formatting as in normal correspondence. Teletex standards are the responsibility of CCITT. Teletex was expected to replace telex by about 1990 but has so far had limited market acceptance; its future is in some doubt because of the rapid spread of fax.