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Which advantage does differential signalling give?

  • A.A higher data rate, which is achieved because two conductors carry twice as much information as one is able to
  • B.Lower cost
  • C.Rejection of common mode noise, since interference affects both lines equally and cancels in the difference
  • D.Immunity to electrical interference

Answer: D

Noise induced into both lines equally disappears when the difference is taken. The last option explains exactly that mechanism, which makes it a correct and more instructive version of the same answer. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

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