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Which fault does a short between the two bus lines produce?

  • A.A resistance reading of near zero across the bus together with the failure of every module upon that network
  • B.A total loss of communication on that network
  • C.Intermittent communication, which continues at a reduced rate because the differential signal is partly preserved
  • D.No fault

Answer: B

Shorting the lines destroys the differential signal entirely and nothing communicates. The last option describes both the measurement and the symptom, which makes it a correct and fuller version of the same answer. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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