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Why higher speed communications in parallel transmission require shorter length?

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Why higher speed communications in parallel transmission require shorter length?

(a) Cost

(b) Resistance

(c) Inductive and capacitance effects

(d) Noise

This question was posed to me during a job interview.

Question is taken from Parallel and Serial Transmission topic in section Digital Communication Techniques of Avionics

1 Answer

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Best answer
The correct option is (c) Inductive and capacitance effects

Easiest explanation: As the speed of transmission or the frequency of transmission increases the wavelength of transmission becomes comparable with the length of the data bus. This causes inductive and capacitance effects which degrade the signal.

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