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Which repair standard applies to a damaged bus wire?

  • A.Any repair is acceptable, since the differential signalling makes the network insensitive to the method used
  • B.Solder only
  • C.Restore the twist rate over the repair and use a sealed crimp, since an untwisted section loses its noise immunity
  • D.Maintain the twist and use a proper crimped splice

Answer: D

Untwisting even a short length opens the pair to induced noise. The last option explains exactly why the twist must be restored, which makes it a correct and more instructive version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist.

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