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2. USB hub - Wikipedia

   en.wikipedia.org/wiki/USB_hub

   For example, if a USB 1.1 device is connected to a port on a USB 2.0 hub, then the TT would automatically recognize and translate the USB 1.1 signals to USB 2.0 on the uplink. However, the default design is that all lower-standard devices share the same transaction translator and thus create a bottleneck, a configuration known as the single ...

3. USB 3.0 - Wikipedia

   en.wikipedia.org/wiki/USB_3.0

   USB 3.0 port provided by an ExpressCard-to-USB 3.0 adapter may be connected to a separately-powered USB 3.0 hub, with external devices connected to that USB 3.0 hub. On the motherboards of desktop PCs which have PCI Express (PCIe) slots (or the older PCI standard), USB 3.0 support can be added as a PCI Express expansion card .

4. Extensible Host Controller Interface - Wikipedia

   en.wikipedia.org/wiki/Extensible_Host_Controller...

   For example, a USB 2 PCIe host controller card that presents 4 USB "Standard A" connectors typically presents one 4-port EHCI and two 2-port OHCI controllers to system software. When a high-speed USB device is attached to any of the 4 connectors, the device is managed through one of the 4 root hub ports of the EHCI controller.

5. 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 3.0 and up) allows a host or a hub to provide up to 4.5 W in six steps of 150 mA.

6. USB communications - Wikipedia

   en.wikipedia.org/wiki/USB_communications

   The written USB 3.0 specification was released by Intel and its partners in August 2008. The first USB 3.0 controller chips were sampled by NEC in May 2009, [4] and the first products using the USB 3.0 specification arrived in January 2010. [5] USB 3.0 connectors are generally backward compatible, but include new wiring and full-duplex operation.

7. USB hardware - Wikipedia

   en.wikipedia.org/wiki/USB_hardware

   A number of extensions to the USB Specifications have progressively further increased the maximum allowable V_BUS voltage: starting with 6.0 V with USB BC 1.2, [42] to 21.5 V with USB PD 2.0 [43] and 50.9 V with USB PD 3.1, [43] while still maintaining backwards compatibility with USB 2.0 by requiring various forms of handshake before ...