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How are FBW signals transmitted?

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How are FBW signals transmitted?

(a) Simplex

(b) Duplex

(c) Time division multiplexing

(d) Code division multiplexing

This question was addressed to me in an interview for job.

This key question is from Fly-By-Wire Technology topic in chapter Fly by Wire Flight Control of Avionics

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Correct choice is (c) Time division multiplexing

For explanation: Transmission of electric signals is a key element in a FBW system. Faster the signal transmission, quicker the response of the aircraft to the pilot stick controls. Time division multiplexing is used where signals can be transmitted along a network comprising only of two wires as only one set of data is being transmitted at any particular time.

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