Simplex communication: Difference between revisions
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rv - Totally incorrect information. Simplex is not "bidirectional". You seem to be purely in terms of radio systems, but "simplex" applies to any other communication channel, which can and do behave differently. |
Added more examples of simplex buses. This was so incorrect I couldn't walk away. At least now I know where all of the interviewees are getting there definitions. |
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[[File:Simplex.jpg|thumb|Simplex wireless communication]] |
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'''Simplex communication''' is a [[Channel (communications)|communication channel]] that sends information in one direction only.<ref> IEEE Std. 100 "Dictionary of Standards Terms", "Simplex" p.1053 </ref> The [[International Telecommunication Union]] definition is a communications channel that operates in one direction at a time, but that may be reversible; this is termed [[half duplex]] in other contexts. A [[Duplex (telecommunications)|duplex]] communication channel requires two simplex channels operating in opposite directions. |
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'''Simplex communication''' is a single channel/frequency bidirectional time division multiplexed communication system. Only one user can transmit at a time. |
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For example, in TV and radio [[broadcasting]], information flows only from the transmitter site to multiple receivers. A pair of [[walkie-talkie]] [[two-way radio]]s provide a simplex circuit in the ITU sense; only one party at a time can talk, while the other listens until it can hear an opportunity to transmit. The transmission medium (the radio signal over the air) can carry information in only one direction. |
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The old [[Western Union]] company used the term simplex when describing the [[duplex (telecommunications)|half-duplex]] and simplex capacity of their new [[transatlantic telegraph cable]] completed between [[Newfoundland (island)|Newfoundland]] and the [[Azores]] in 1928.<ref>Milnor, J.W. and G.A. Randall. "The Newfoundland-Azores High-Speed Duplex Cable". ''A.I.E.E. Electrical Engineering''. May 1931</ref> The same definition for a simplex radio channel was used by the [[National Fire Protection Association]] in 2002.<ref>''Report of the Committee on Public Emergency Service Communication''. NFPA 1221, May, 2002.</ref> |
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==Examples== |
==Examples== |
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Telegraph systems |
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* Commercial [[radio]] and [[television]] [[broadcast]] (not [[two-way radio]] such as walkie-talkies) |
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Citizen band radio |
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* [[Garage door opener]]s |
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RS-232C |
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* [[Baby monitor]]s |
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IEE-488 |
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* [[Wireless microphone]]s |
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GPIB |
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* [[Radio controlled model]]s |
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1553 |
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* [[Public address system]]s |
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* [[Surveillance camera]]s |
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* [[Pager]]s |
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* Communication between a [[computer mouse|mouse]] and a computer |
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* [[IP Multicast|Internet multicast]] |
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* [[Radio navigation]] beacons and [[radiolocation]] services such as [[Global positioning system|GPS]] |
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* [[Telemetry]] |
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* [[printer (computing)|printers]] |
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==References== |
==References== |
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Revision as of 15:33, 6 April 2017
Simplex communication is a single channel/frequency bidirectional time division multiplexed communication system. Only one user can transmit at a time.
Examples
Telegraph systems Citizen band radio RS-232C IEE-488 GPIB 1553
References
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