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ARINC 629 differs from ARINC 429 chiefly in that it

  • A.Carries only analogue signals
  • B.Allows multiple transmitters
  • C.Uses a bus controller
  • D.Is unidirectional

Answer: B

Terminals wait out timing intervals that guarantee each gets access without collision. Removing both the single transmitter restriction and the central controller was the point of the design. Both restrictions went at once.

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