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[–] mostlyfriendly 0 points 1 points (+1|-0) ago 

PAM4 modulated signal has four amplitude levels and three eyes.

... this ... this just blows my mind.

The encode / decode sequence? The error correction? Accounting for drift over non ideal cables? Having multiple encoders / decoders all working in parallel and getting everything sync'd? This is insanity.

The fact that they are trying to do this just rocked my world a bit.