Discussion
Consider the following statements about MIL-STD-1553:
1. A bus controller directs all traffic.
2. Manchester encoding allows the clock to be recovered from the data.
3. Any remote terminal may transmit whenever it has data ready.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
The first two are correct. The bus controller directs all traffic, and Manchester encoding puts a transition in every bit so the receiver can recover the clock from the data.
The third describes a contention bus and is the opposite of how MIL-STD-1553 works. No remote terminal transmits until commanded, which is precisely what makes the traffic deterministic: nothing collides, and the worst-case delivery time follows from the controller's schedule.
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