It doesn't eliminate all noise. You can play these games, but can never violate Shannon's. We hit Baud rates where channel loss was high enough that the SNR n

It doesn't eliminate all noise. You can play these games, but can never violate Shannon's. We hit Baud rates where channel loss was high enough that the SNR needed to be cut into to get more throughput. This cut the SNR so much that FEC was needed to maintain an acceptable error rate. PCIe lags IEEE 802.3 with these kinds of things. I'd call it bog standard but it's still bleeding edge.