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A CAN bus loaded to 70 per cent of its capacity is

  • A.impossible, arbitration failing above 50 per cent
  • B.fully loaded, no further frames being possible
  • C.at the practical limit, latency of low priority frames growing sharply
  • D.lightly loaded, with something approaching half the capacity still unused

Answer: C

Because arbitration is by fixed priority, the lowest priority frames wait for every higher one and their worst-case latency climbs steeply as the bus fills. Thirty to fifty per cent is the load usually designed for in a vehicle network.

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