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ONE WAY AT A TIME

According to the ITU-T definition, a simplex circuit is one where all signals can flow in only one direction ''at a time''. This was also the way Western Union used the term when describing the Duplex and simplex capacity of their new Transatlantic Telegraph Cable completed between Newfoundland and the Azores in 1928Milnor, J.W. and G.A. Randall. "The Newfoundland-Azores High-Speed Duplex Cable". ''A.I.E.E. Electrical Engineering''. May 1931. The same definition for a simplex radio channel was used by the National Fire Protection Association in 2002''Report of the Committee on Public Emergency Service Communication''. NFPA 1221, May, 2002..


ONE WAY ONLY

According to the ANSI definition, a simplex circuit is one where all signals can flow in only one direction. These systems are often employed in broadcast networks, where the receivers do not need to send any data back to the transmitter/broadcaster.


Examples according to ANSI definition



REFERENCES



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