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I want someone to make a video series where they exceed cable lengths and show what happens.

what happens if you have a 2km USB cable? what works and what breaks?

@foone USB1/2 has strict timing requirements, so it simply won't work at all past a certain point. It's not about signal quality, the protocol just can't handle delay. I think USB3 fixed that, but sadly USB2 over USB3 is not a thing, so that only works for USB3 native devices.

Most other protocols can handle distance fine if the signal integrity is maintained (which is how you get fiber converters and such). Or you can just be LTT and chain a bunch of PCIe extenders together and it works anyway because PCIe is awesome: youtu.be/q5xvwPa3r7M

So how do USB3 over fiber extenders work? They use this cursed thing that converts USB2 to USB3 at the protocol level. It doesn't conform to any specification, doesn't work with all devices, and literally makes software see USB2 devices as USB3 devices: via-labs.com/product_show.php?

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@lina @foone is this the chip that was built for virtuallink you are talking about or are there more?

@robot @foone I think it's that one! Or at least a newer revision of it.