Discussion
Consider the following statements about bus design:
1. Loading is kept well below capacity to allow for modification.
2. Determinism means the worst case delivery time can be bounded.
3. A deterministic bus cannot fail.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
The first two are correct. Loading is held well below capacity to leave room for later modification and to keep latency bounded, and determinism means the worst-case delivery time can be computed and demonstrated.
The third confuses determinism with reliability. A deterministic bus can certainly fail - a severed cable stops it entirely, which is why MIL-STD-1553 and AFDX are both duplicated. Determinism says when a message arrives if it arrives, not that it always will.
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