One of the fun parts of this is when you start realizing digital methods of improving analog signaling exist. He mentions one of these techniques briefly in th

One of the fun parts of this is when you start realizing digital methods of improving analog signaling exist. He mentions one of these techniques briefly in this article: equalization. The condensed version is that you use an ADC for the receiver, sample the incoming waveform, then pass the resulting samples through a digital filter that amplifies the high frequencies and suppresses the lower frequencies. This is actually quite good at counteracting the losses and phase shakeups that come with passing high speed signals through long cables.