A radio communications technology that allows only one way communication at any one time. The operating frequency is either used for listening or for talking. e.g Walkie Talkie.
Semi Duplex
A semi duplex in radio communications is transmission one way at the time (either listening or talking) and the uplink and downlink operate on two different frequencies. It is a special case of simplex operations. e.g TETRA group communication.
Full Duplex
A full duplex in radio communications is transmission in both directions at the same time is possible. e.g Mobile telephone service.
Both directions can be separated in time or in frequency. This is called Time Division Duplex (TDD) and Frequency Division Duplex (FDD) respectively.
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