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Nice find! Section 3.1 explains it quite well. I didn't know that USB 3.0 implements a dual bus, with USB 2.0 pretty much completely separated.
– Martin
Commented May 24, 2011 at 18:41
I have a Lenovo E50-80 (model 80J2) - it features 2 USB 3.0 ports. I can use 2 1080p USB 2.0 webcams on these ports simultaneously even though each webcam draws about 15 megabytes/s alone and they will not work together when connected via a USB 2.0 hub. This means the USB 3.0 must do transaction translation from high-speed to super-speed. Surely such a transaction translation may not be a part of USB3.0 specs but in reality there seem to be devices that do perform this (VL670 for example). I monitored the data traffic with usbtop utility. Anyone has similar experience?
– Kozuch
Commented Jul 13, 2018 at 12:39

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