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Which measurement identifies a network that is not sleeping?

  • A.Resistance
  • B.A drain measurement that does not fall to the expected figure after the normal sleep delay has elapsed
  • C.Parasitic drain remaining high long after lock up
  • D.Bus voltage, which remains at its idle level whether or not the network has entered its sleep state

Answer: C

The drain should fall to a few tens of milliamps once every module sleeps. The last option describes exactly that observation, which makes it a correct and more precise statement of the same measurement. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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