Discussion
Error detection strength.
| Mechanism | Detects | Misses |
|---|---|---|
| Single parity bit | Odd numbers of bit errors | Even numbers of errors |
| Checksum | Most random corruption | Some structured patterns |
| Cyclic redundancy check | Nearly all burst errors | Very rare specific patterns |
| Redundant transmission | Corruption and path loss | Correlated failures |
Why did later buses move away from a single parity bit?
Answer: D
Correct answer: It misses an even number of errors
Parity works by making the total count of ones odd, so two errors, or four, restore the original parity and the word passes as good.
That is a serious limitation where a burst of noise typically corrupts several adjacent bits at once. ARINC 429 accepts it because a discarded word is replaced within milliseconds by the next update, but a bus carrying data that is not repeated at that rate needs a CRC. Computation speed and bit cost both favour parity, so neither can be the reason it was abandoned.
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