Duplex, Half Duplex and Simplex

Duplex, Half Duplex and Simplex are the three possibilities for the direction of data transmission.

Simplex

Simplex is data transmission in one direction only.  Two directional transmission is not possible.

e.g. a radio station broadcast.

Half Duplex

Data transmission in both directions is possible, but not at the same time.

e.g. walkie talkies

Full Duplex

Data transmission is possible in both directions at the same time (simultaneously).

e.g. telephones.

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