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2. USB hub - Wikipedia

   en.wikipedia.org/wiki/USB_hub

   Most USB hubs use one or more integrated controllers (ICs), of which several designs are available from various manufacturers. Most support a four-port hub system, but hubs using 16-port hub controllers are also available in the industry. [citation needed] The USB bus allows seven cascading tiers of ports. The root hub is the first tier, and ...

3. List of interface bit rates - Wikipedia

   en.wikipedia.org/wiki/List_of_interface_bit_rates

   The physical phenomena on which the device relies (such as spinning platters in a hard drive) will also impose limits; for instance, no spinning platter shipping in 2009 saturates SATA revision 2.0 (3 Gbit/s), so moving from this 3 Gbit/s interface to USB 3.0 at 4.8 Gbit/s for one spinning drive will result in no increase in realized transfer rate.

4. USB hardware - Wikipedia

   en.wikipedia.org/wiki/USB_hardware

   Micro-USB connectors, which were announced by the USB-IF on January 4, 2007, [15] [16] have a similar width to Mini-USB, but approximately half the thickness, enabling their integration into thinner portable devices. The Micro-A connector is 6.85 by 1.8 mm (0.270 by 0.071 in) with a maximum overmold boot size of 11.7 by 8.5 mm (0.46 by 0.33 in ...

5. USB human interface device class - Wikipedia

   en.wikipedia.org/wiki/USB_human_interface_device...

   The USB interface is vulnerable to security exploits such as BadUSB that abuse the combination of USB's ability to connect many different kinds of devices, its inability to verify that devices are actually what they claim to be, the possibility for USB devices to change their type or announce additional subdevices while plugged in, and its ...

6. USB communications - Wikipedia

   en.wikipedia.org/wiki/USB_communications

   0–4: Recipient: USB software component being addressed 0 = Device 1 = Interface 2 = Endpoint 3 = Other 4–31 (reserved) 5–6: Type: Used with bRequest byte 0 = Standard (supported by all USB devices) 1 = Class (Depends on USB device class) 2 = Vendor 3 (reserved) 7: Direction: 0 = Host to device, or no data transfer (wLength == 0)

7. USB - Wikipedia

   en.wikipedia.org/wiki/USB

   USB up to 2.0 allows a host or hub to provide up to 2.5 W to each device, in five discrete steps of 100 mA, and SuperSpeed devices (USB 3.x) allows a host or a hub to provide up to 4.5 W in six steps of 150 mA. USB-C allows for dual-lane operation of USB 3.x with larger unit load (250 mA; up to 7.5 W) [96]. USB-C also allows for Type-C Current ...