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A 2 per cent baud rate error between two ends of an 8N1 link is

  • A.fatal, no characters being received at all
  • B.harmless, parity correcting the resulting errors
  • C.marginal, the accumulated error reaching a fifth of a bit by the stop bit
  • D.harmless, the receiver being able to resynchronise itself on every single bit

Answer: C

The receiver resynchronises only on the start bit, so a two per cent error has grown to twenty per cent of a bit time by the tenth, which is close to the sampling margin. Roughly two per cent combined is the usual working limit.

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