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Which reading indicates a missing terminator?

  • A.About 120 ohms across the bus
  • B.About 60 ohms, which is the value expected when both of the terminating resistors are present within the network
  • C.Zero ohms
  • D.Approximately double the normal reading, which indicates that only one of the two terminating resistors remains

Answer: A

Losing one terminator doubles the measured resistance from sixty to a hundred and twenty. The last option states that relationship generally, which makes it a correct and equivalent answer. Communication often continues intermittently. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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