Discussion
Consider the following pairs of concept and description:
Determinism - A bounded and demonstrable worst case delivery time
Bus loading - The fraction of capacity in use
Virtual link - A logical unidirectional path to defined receivers
Determinism - A guarantee that the bus will never fail
How many of the pairs given above are correctly matched?
Answer: C
Correct answer: Only three
The first three are sound. Determinism is a bounded and demonstrable worst-case delivery time; bus loading is the fraction of capacity in use; and a virtual link is a logical unidirectional path to defined receivers.
The fourth confuses determinism with reliability. A deterministic bus can still fail - a severed cable stops it entirely, which is why MIL-STD-1553 and AFDX are both duplicated. What determinism guarantees is when a message arrives if it arrives at all, not that it always will.
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