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Channel Loss Budget (dB):-10
azonenberg's earlier analysis
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Loss Per Connector (dB):-1
http://suddendocs.samtec.com/testreports/epr_qth-qsh-16mm_85ohm-diffz_web.pdf
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TL Loss (dB/in)-0.2
https://www.edn.com/electronics-blogs/all-aboard-/4429778/Loss-in-a-channel--Rule-of-Thumb--9
among other sources
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Distance (in):20
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# of Connector Pairs:2
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Total Loss (dB):-6
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Eye Required (UI):0.625
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UI (ps):800
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Eye Required (ps):500
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Skew Budget (ps):300
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Er Effective:2.5728
Saturn PCB for 6/6 on 6.7mil FR408 (OSH Park stackup)
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Skew Factor (ps/cm):207.814445
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Mismatch Allowance (cm):1.443595511
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Mode conversion skew assumed to be low (good impedance match between diff pair legs)
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See also https://www.nxp.com/files-static/training_presentation/TP_HARDWARE_DESIGN_PCI_SMGIII.pdf for some encouraging results
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