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Which naming do the two lines of a controller area network carry?

  • A.High and low
  • B.Positive and negative, which reflect the polarity of the signal carried by each of the two conductors in the pair
  • C.Transmit and receive
  • D.The high line which rises above the idle level and the low line which falls below it during a dominant bit

Answer: A

The lines are called high and low after the direction each moves during a dominant bit. The last option explains exactly why they are so named, which makes it a correct and more informative statement. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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