I don’t know anything about what you just said as I don’t have that level of digital/analog design knowledge to know how to respond. All I know is that USB 3.0 cable lengths is 18 meters but to get there the cable becomes incredibly thick, heavy and inflexible. ePCIe cables are measured in cm. Ethernet can go up to 100m at 10GBe or more if you’re willing to sacrifice some speed (or faster if you sacrifice some cable length)
Could switching to PCIe instead of Ethernet for the digital signaling have better performance? I don’t know but I doubt it. Ethernet is hitting 100gbps and higher and I suspect the challenge is designing cabling that can hit just as much as the analog design piece. Not to mention that USB3.2 and Ethernet have very similar speeds, just Ethernet can manage it over much longer distances at significantly lower cost. I’m skeptical PCIe has some kind of magic bullet here. These protocols are optimized for totally different use cases.
Could switching to PCIe instead of Ethernet for the digital signaling have better performance? I don’t know but I doubt it. Ethernet is hitting 100gbps and higher and I suspect the challenge is designing cabling that can hit just as much as the analog design piece. Not to mention that USB3.2 and Ethernet have very similar speeds, just Ethernet can manage it over much longer distances at significantly lower cost. I’m skeptical PCIe has some kind of magic bullet here. These protocols are optimized for totally different use cases.