Editing Telegraphy (section)

=== Telex ===
{{Main article|Telex}}
[[File:ITT Creed Model 23B teleprinter (46479610772).jpg|thumb|ITT Creed Model 23B teleprinter with telex dial-up facility]]

[[Telex]] (telegraph exchange) was a public switched network of teleprinters. It used rotary-telephone-style [[pulse dialling]] for automatic routing through the network. It initially used the [[Baudot code]] for messages. Telex development began in Germany in 1926, becoming an operational service in 1933 run by the {{lang|de|[[Reichspost]]}} (the German imperial postal service). It had a speed of 50 baud—approximately 66 words per minute. Up to 25 telex channels could share a single long-distance telephone channel by using [[voice frequency telegraphy]] [[frequency-division multiplexing|multiplexing]], making telex the least expensive method of reliable long-distance communication.<ref>{{Cite web |title=Telegraphy and Telex |url=https://new.siemens.com/global/en/company/about/history/technology/information-and-communications-technology/telegraphy-and-telex.html |access-date=2022-10-14 |website=siemens.com Global Website |language=en}}</ref> Telex was introduced into Canada in July 1957, and the United States in 1958.<ref>Phillip R. Easterlin, "Telex in New York", Western Union Technical Review, April 1959: 45</ref> A new code, [[ASCII]], was introduced in 1963 by the [[American Standards Association]]. ASCII was a seven-bit code and could thus support a larger number of characters than Baudot. In particular, ASCII supported upper and lower case whereas Baudot was upper case only.