Comment by eqvinox
7 months ago
> What are they doing differently and why can't we do that?
You're (incorrectly) assuming they're doing Ethernet/IP in that test setup. They aren't (this is implied by the results section discussing various FEC, which is below even Ethernet framing), so it's just a petabit of raw layer 1 bandwidth.
It's also important to note that many optical links don't use ethernet as a protocol either (SDH/SONET are the common ones), although this is changing more and more.
Looks like SDH/SONET topped out at 40 Gbps which means it died 10 years ago.
SONET is widely used in the US.
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