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The use of blue pantone thermoplastics in USB 3.0 connectors is recommended on systems with a mix of USB 2.0 and USB 3.0 ports. For certification, the USB-IF does require that the user be able to clearly and easily distinguish between a USB 3.0 and a USB 2.0 port on a system ; however, it is left to the system implementer on how to accomplish this.
Accordingly, a USB 3.0 Type B receptacle on a peripheral device can be connected using the corresponding plug end of a USB 2.0 Type B cable. Type B plugs in USB 3.0 are somewhat larger; therefore, a USB 3.0 Type B plug cannot enter a USB 2.0 or earlier Type B receptacle.
Some additional info: The little 'H' and 'S' in the great tool 'USB Device Tree Viewer' are only visible, if you run Windows 8.x (Text from Uwe Siebers site: "Windows 8 has native support for USB 3.0 SuperSpeed and an enhanced USB stack which delivers more information, e.g. which speed each port supports.
The USB 3.0 port supports USB 1.0, 2.0, and 3.0 devices. The first layer of pins inside of the USB connector are for USB 1.0 and 2.0 ports. The second layer of pins inside of the USB connector are for USB 3.0 ports. Therefore, to resolve this issue, make sure the USB 3.0 device is fully inserted into the port. Method 2: 1.
For USB-C the minimum to meet the USB 3.0 spec is 1.5 amps. The maximum for USB-C is 3 amps, unless using USB-PD at 20 volts or more then it's 5 amps. Power out of a hub cannot exceed what goes in. The USB spec says a port must be able to provide 900 mA minimum, but there are exceptions for hubs. On a hub it may only be required to supply 150 mA.
And so, I I think I need to install USB 3.0 drivers first, so that it reflects in Device manager and then USB 2 devices will work in USB 3 ports. From Dell website, for my PC model, the only USB 3.0 drivers available is "Renesas USB3.0 Host Controller Driver". Even with installing/uninstalling the driver, I don't see its reflection in my Device ...
Power that must be delivered by a USB port is defined in Section 7.2.1 of USB 2.0 Specifications. To start, the power delivery is defined in "units of load". For USB 2.0 one unit is 100 mA, and for USB 3.x one unit is 150 mA. USB standard defines two classes of USB ports, "high-power ports", and "low-power ports" The specs says, page 171:
In summary, a USB 3.0 host controller with a full-speed or high-speed USB 2.0 device is not the same circuit as the same device attached to a USB 2.0 host controller, and the timing will not be identical. However, any latency improvement will be at most a couple microseconds.
Windows reports the USB controller as Intel(R) USB 3.0 eXtensible Host Controller. Both ports go through the same root hub. Please tell me if I need to supply more details regarding the controller. There is no BIOS option to switch USB speed (as it turns out, there is, but not clearly presented). I would like the other port to operate at 3.0 ...
USB ports - 4 USB 2.0 on back, 2 USB 3.0 on back, 2 USB 3.0 on front. USB device manager - Intel USB 3.0 eXtensible Host Controller - 1.0 . USB Composite Device. USB Composite Device . USB Root Hub (USB 3.0) P.S. - It is not a problem with the device itself as I have plugged it into my laptop and it has worked just fine.