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Which of the following is not an advantage of using a digital data bus?

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Which of the following is not an advantage of using a digital data bus?

(a) Self test

(b) Multiplexing

(c) less weight

(d) Not affected by electromagnetic interference

The question was posed to me during a job interview.

My query is from Digital Implementation in portion Fly by Wire Flight Control of Avionics

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The correct option is (d) Not affected by electromagnetic interference

Explanation: Very large reductions in the weight of cabling are achieved by the use of multiplexed data transmission and data bus networks. High integrity data transmission can be achieved with very comprehensive self checking and data validation capabilities. However, they are heavily affected by electromagnetic interference.

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