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Bit stuffing on a CAN bus exists to

  • A.separate the identifier from the data field
  • B.guarantee enough transitions for receivers to stay synchronised
  • C.pad every frame to the same total length
  • D.provide the whole of the error detection for the data field

Answer: B

After five identical bits a complementary bit is inserted, so a long run of the same value cannot starve the receivers of edges. It makes the frame length depend on the data, which is why CAN timing is quoted as a worst case.

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