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telex
International telegraphic message-transfer service consisting of a network of teleprinters. Subscribers to a telex service can exchange textual communications and data directly with one another. Telex systems originated in Europe in the early 1930s and were widely used for several decades. The ability to conduct high-speed digital communication over regular telephone lines led to a decline in the use of telex, but it is still used as a data transmission service for applications in which high transmission speeds are not necessary or in areas where more modern data equipment is not available.
Telex
(1) (TELetypewriter EXchange) An international, dial-up data communications service administered in the U.S. by AT&T, MCI and other providers. Developed in the U.S. and other European countries in the 1930s, it was the first data communications service that used typewriter-like terminals (teletypewriters). Prior to Telex, telegrams and cablegrams were the primary method for delivering a text message. By the 1960s, Telex became a worldwide, real-time, data communications service. Although diminishing each year, Telex is still used for commerce in more than 200 countries.
Telex started out transmitting Baudot code at 50 bps. Although upgraded, it is still a low-speed data service. It was originally administered worldwide by various carriers and the local PTTs. Western Union handled the U.S., and in 1971, purchased and integrated the Bell System's TWX service. AT&T acquired Western Union's Telex service in 1991.
(2) (Telex Communications, Inc., Burnsville, MN, www.telex.com) A manufacturer of hearing aids and audio communications devices founded in 1936. Originally making hearing aids, the company evolved into a manufacturer of a variety of audio products, including intercoms, microphones, speakers, headsets, antennas and LCD projectors.
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| Early Telex Center |
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| A far cry from today's network control centers, this Telex center in Berlin, Germany in 1933 initially communicated with another center in Hamburg. The teletypewriters and communications equipment were made by Siemens. (Image courtesy of Fujitsu Siemens Computers GmbH.) |
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