Which of the following communication modes support two - ways traffic but in only one direction at a time?

Options

A. Simplex
B. Half - duplex
C. Full - duplex
D. Three - quarter duplex

Answer

B

Explanation

A half-duplex (HDX) system provides communication in both directions, but only one direction at a time (not simul- taneously). Typically, once a party begins receiving a signal, it must wat for the transmitter to stop transmitting, before replying (antennas are of trans-receiver type in these devices, so as to transmit and receive the signal as well). An example of a half-duplex system is a two-party system such as a walkie-talkie.