Assertion: cable's series | /r/CapableOf | come into play
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text: First, a digital signal, because of its sharp transitions, is highly subject to degradation in its waveform; those sharp transitions are equivalent to a long--indeed, an infinite--series of harmonics of the base frequency, and the higher the frequency of the signal, the more transmission line effects, such as the characteristic impedance of the cable, and resulting signal reflections ("return loss") come into play.