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What does the term "duplex communication" mean?
  • A
    Communication relating to air navigation that is for all aircraft and stations within range.
  • B
    One-way communication from aircraft to stations or locations on the surface of the Earth.
  • C
    Communication between two stations that can take place in both directions simultaneously.
  • D
    One-way communication from stations or locations on the surface of the Earth to aircraft.

ICAO Annex 10, Volume II

Duplex. A method in which telecommunication between two stations can take place in both directions simultaneously.

Simplex. A method in which telecommunication between two stations takes place in one direction at a time.
Note.— In application to the aeronautical mobile service this method may be subdivided as follows:

a) single channel simplex;
b) double channel simplex;
c) offset frequency simplex

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