Discussion
MIL-STD-1553 achieves redundancy by
Answer: D
Correct answer: Providing dual redundant bus pairs
The standard specifies two independent buses, A and B, each with its own wiring and transformers. Terminals connect to both, and the bus controller uses one at a time, switching to the other if a transfer fails.
The redundancy is therefore in the medium, which is where the vulnerability lies - a severed or shorted cable takes out a bus, not a terminal. Transmitting every message twice would halve the throughput without protecting against a broken wire, and duplicating terminals addresses a different failure altogether.
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