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What does the term "simplex communication" mean?
  • A
    One-way communication from aircraft to stations or locations on the surface of the Earth.
  • B
    Any transmission, emission, or reception of signs, signals, writing, images, and sounds.
  • C
    Communication between two stations that can take place in both directions simultaneously.
  • D
    Communication between two stations which takes place in one direction at a time.

ICAO Annex 10, Volume II

Simplex. A method in which telecommunication between two stations takes place in one direction at a time.

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

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