Discussion
Consider the following statements about ARINC 429:
1. It has a single transmitter and multiple receivers.
2. Its word is 32 bits long.
3. It uses a cyclic redundancy check for error detection.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
The first two are correct: ARINC 429 has one transmitter broadcasting to up to twenty receivers, and its word is 32 bits.
The third is false. The word's only error detection is a single parity bit at bit 32 - there is no room in 32 bits for a CRC and none is defined. That is a real weakness, since parity misses every even number of errors, and the standard tolerates it because a discarded word is replaced by the next update within milliseconds.
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