You got this mostly right. A few notes. A. Cable physically consists of: Either 0 or 4 high speed lanes. Never 2. Otherwise correct. B. I do not use USB pro

You got this mostly right. A few notes. A. Cable physically consists of: Either 0 or 4 high speed lanes. Never 2. Otherwise correct. B. I do not use USB protocol numbers for they are confusing. I use USB data speed. 480mbps is over the USB 2.0 wires, 5/10/rarely 20 is over the high speed lanes. The only negotiation USB requires is the decision of who becomes upstream (host) and who the downstream (device). > Laptops with one ThunderBolt port typically support DisplayPort 1.2 bandwidth on the bus, laptops with two ThunderBolt ports support two DisplayPort 1.2 bandwidth. Or two DisplayPort 1.4 bandwidth, depending on the TB3 controller. Data hub is passive in the sense of not containing any protocol converters. It still needs a USB C controller to negotiate DisplayPort alt mode.