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A wire signal is a brevity code used by telegraphers to save time and cost when sending long messages. The best-known code was the 92 Code adopted by Western Union in 1859. The code was designed to reduce bandwidth consumption over telegraph lines, thus speeding transmissions by utilizing a numerical code system for frequently used phrases.
In 1932, the CCITT introduced the International Telegraph Alphabet No. 2 (ITA2) code [15] as an international standard, which was based on the Western Union code with some minor changes. The US standardized on a version of ITA2 called the American Teletypewriter code (US TTY) which was the basis for 5-bit teletypewriter codes until the debut of ...
Commercial codes were not generally intended to keep telegrams private, as codes were widely published; they were usually cost-saving measures only. Many general-purpose codes, such as the Acme Code and the ABC Code , were published and widely used between the 1870s and the 1950s, before the arrival of transatlantic telephone calls and next-day ...
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Western Union Telegraph Building, lithograph. The Western Union Company is an American multinational financial services corporation headquartered in Denver, Colorado.. Founded in 1851 as the New York and Mississippi Valley Printing Telegraph Company in Rochester, New York, [3] the company changed its name to the Western Union Telegraph Company in 1856 after merging with several other telegraph ...
Brevity codes that are specifically designed for use between communications operators and to support communication operations are referred to as "operating signals". These include: Prosigns for Morse code; 92 Code, Western Union telegraph brevity codes