Simplex communication refers to communication that occurs in one direction only. Two definitions have arisen over time: a common definition, which is used an ANSI standard and elsewhere, and an ITU-T definition. The ITU definition of simplex is termed "half duplex" in other contexts.
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ANSI definition: One way signaling
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
- Commercial radio broadcast (not walkie-talkies, etc.)
- Television broadcast
- Internet multicast
- One-way communications from a launcher to a guided missile, where the launcher (airplane, ship, etc.) sends commands to the missile, but does not receive any information sent back.
ITU-T definition: One way signaling at a time
According to the ITU-T definition, a simplex circuit is one where signals can flow in only one direction at a time. At other times communications can flow in the reverse direction. A more common term for this application is half-duplex.
The old Western Union company used the term simplex when describing the half-duplex and simplex capacity of their new transatlantic telegraph cable completed between Newfoundland and the Azores in 1928[1]. The same definition for a simplex radio channel was used by the National Fire Protection Association in 2002[2].
See also
References
- ^ Milnor, J.W. and G.A. Randall. "The Newfoundland-Azores High-Speed Duplex Cable". A.I.E.E. Electrical Engineering. May 1931
- ^ Report of the Committee on Public Emergency Service Communication. NFPA 1221, May, 2002.
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