COM (Channel Operating Margin) is a copper link margin and pass/fail tool popular in PAM-2 and PAM-4 25 Gb/s and faster standards. COM relies on simplifications in which the non-linearity of the link is part of the penalty.  

But as the link technology develops past the earlier COM usage, dividing the non-linearity assumption offers a path to link improvement: some of the transmitter non-linearity can be an advantage, rather than a penalty.

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