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A serial link works at 9600 baud and produces framing errors at 115 200. The likeliest cause is

  • A.the parity setting differing between the two ends of the link
  • B.the receiver's buffer being too small
  • C.a baud rate error too large at the higher speed
  • D.the cable being too long for either speed

Answer: C

A percentage error that is tolerable at a low rate is often generated by a divider that cannot express the higher rate exactly, particularly from an untrimmed internal oscillator. A parity mismatch would fail at both speeds and a small buffer gives overruns rather than framing errors.

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