Discussion
Which of the following is not a reason for keeping bus loading well below capacity?
Answer: B
Correct answer: A lightly loaded bus transmits at a higher data rate
The data rate is fixed by the standard - 100 kbit/s on high-speed ARINC 429, 1 Mbit/s on MIL-STD-1553 - and does not vary with how much traffic is present. Bits go out at the same speed whether the bus is busy or idle.
The other three are the genuine reasons: existing timing guarantees stay undisturbed, later modifications can be accommodated without rewiring, and latency remains insensitive to small changes in traffic, which is what keeps the worst case demonstrable.
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