COM (channel operating margin) is a recently adopted method of SERDES channel compliance evaluation. It provides a convenient pass/fail metric for PAM-2 and PAM-4 modulated input, is computationally efficient, includes an efficient FFE/CTLE/DFE parameter optimization strategy, and considers a number of different impairments, such as ISI, jitter, crosstalk aggressors, and Tx/Rx device noise. As signal vias pass through a cavity, coupling can occur. Unfortunately, this source of impedance is often overlooked, resulting in problems with the PDN that can be difficult to diagnose. 
This paper helps you understand this phenomenon and what you can do to suppress it.

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