Discussion
Which of the following would not be affected by adding a new function to a heavily loaded MIL-STD-1553 bus?
Answer: D
Correct answer: The physical encoding used on the bus
Manchester encoding is fixed by the standard. It is a property of the physical layer and is unaffected by how many messages the schedule carries or how heavily loaded the bus is.
The other three all change. The controller's message schedule must be reworked to fit the new transfers in; the timing margins of existing transfers shrink as the schedule tightens; and whatever capacity remained for future growth is consumed. Those three are exactly why adding to a bus already at 75 per cent loading is difficult.
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