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A MIL-STD-1553 bus runs at 1 megabit per second. A 20 bit word takes

  • A.20 microseconds
  • B.2 microseconds
  • C.200 microseconds
  • D.1 microsecond

Answer: A

Dividing gives \( 20/10^6 = 2 \times 10^{-5} \) second. A message of a command word, thirty two data words and a status word therefore occupies about 680 microseconds plus the response gaps. Short messages bound the occupancy.

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