Discussion
Consider the following statements about vehicle networks.
1. A healthy high speed bus measures about 60 ohms with the ignition off.
2. Messages are addressed by content rather than by destination node.
3. A break anywhere in an optical ring affects only the node beyond it.
Which of the statements given above is or are correct?
Answer: A
The first two are correct, but a ring depends on every node passing the signal on, so one break stops the whole network. That property is what makes loop connector testing the standard diagnostic technique. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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