Discussion
Which of the following is not a reason digital buses replaced analogue wiring?
Digital buses need no error detection
A large reduction in wiring weight
Many parameters share one medium
Easier reconfiguration in software
Answer: C
Correct answer: Digital buses need no error detection
Digital buses need error detection more visibly than analogue wiring did, not less. Noise on an analogue line degrades a value gradually; on a digital bus it corrupts a word outright, which is why every such standard defines parity, a checksum or a CRC.
The other three are the genuine reasons for the change: a large reduction in wiring weight, since many parameters share one medium instead of each having its own pair, and reconfiguration in software rather than by rewiring.
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