Discussion
ARINC 429 is described as a
Answer: B
Correct answer: Single transmitter, multiple receiver unidirectional bus
ARINC 429 allows exactly one transmitter on a bus, broadcasting to up to twenty receivers, and data flows one way only. There is no arbitration because there is nothing to arbitrate.
That simplicity is the standard's great strength and its great cost. Nothing can collide and the timing is trivially predictable, but two-way communication needs two buses, and a large aircraft accumulates a great many of them. MIL-STD-1553 uses a controller with remote terminals, and ARINC 664 is the switched network with virtual links.
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