Glossary

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Say
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Simplex Operation
  • Operating method in which transmission occurs in only one preassigned direction. See one-way operation.
  • Deprecated definition: A mode of operation in which communications between two terminals takes place in either direction, but only one direction at a time. Note: This type of operation may occur only on simplex circuits as defined in simplex circuit (def. #2) above.
  • Operating method in which transmission is made possible alternately in each direction of a telecommunication channel, for example by means of manual control. Note: In general, duplex operation and semiduplex operation require two frequencies in radiocommunication; simplex operation may use either one or two. (RR) CAUTION: These three definitions are contradictory; however, all are in common use--the first two are used in telephony; the last one, in radio. The user is cautioned to verify the nature of the service specified by this term. See also duplex circuit, duplex operation, half-duplex circuit, half-duplex operation, one-way communication, one-way-only channel, phantom circuit, simplex circuit, simplex signaling.