Or does it distract from the actual need of the signaling protocol?

Much engineering time is spent on designing differential signaling circuits to maintain a differential impedance between the two sides of the differential pair. A similar amount of time is spent measuring the final PCBs to ensure the differential impedance specification is met. The most common differential impedance target is 100Ω. A fair question is whether this impedance requirement is necessary. Once differential signaling is understood, it will be seen as unnecessary and distracting from the actual need of the signaling protocol. This article will clear up this confusion.

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