> They are now using a fancy encoding on the wire to double the number of bits p... | Hacker News

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		jacquesm on Jan 12, 2022 \| parent \| context \| favorite \| on: PCI-Sig Releases 256GBps PCIe 6.0 X16 Spec > They are now using a fancy encoding on the wire to double the number of bits per symbol. Wasn't there some network standard that used that trick as well?

jabl on Jan 12, 2022 [–]

Yes, "modern" ethernet uses 56 Gb/s (and soon 112 Gb/s) serdes channels with PAM4 modulation.

Similarly HDR Infiniband also switched to PAM4.

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