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2. USB communications - Wikipedia

   en.wikipedia.org/wiki/USB_communications

   USB signals are transmitted using differential signaling on a twisted-pair data cable with 90 Ω ± 15% characteristic impedance. [6] Low speed (LS) and Full speed (FS) modes use a single data pair, labelled D+ and D−, in half-duplex. Transmitted signal levels are 0.0–0.3 V for logical low, and 2.8–3.6 V for logical high level.

3. USB - Wikipedia

   en.wikipedia.org/wiki/USB

   The throughput of each USB port is determined by the slower speed of either the USB port or the USB device connected to the port. High-speed USB 2.0 hubs contain devices called transaction translators that convert between high-speed USB 2.0 buses and full and low speed buses. There may be one translator per hub or per port.

4. USB 3.0 - Wikipedia

   en.wikipedia.org/wiki/USB_3.0

   Left to right: USB 3.0 Standard-A (host) port (the five additional contacts for USB 3 visible on the underside of the tongue), VGA connector, DisplayPort connector, USB 2.0 Standard-A (host) port. Additional power for multiple ports on a laptop PC may be obtained in the following ways:

5. Extensible Host Controller Interface - Wikipedia

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

   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. If a low-speed or full-speed USB device is attached to connectors 1 or 2, it will be routed to the root hub ports of one of the OHCI controllers for management, and low-speed and full-speed USB ...

6. USB hardware - Wikipedia

   en.wikipedia.org/wiki/USB_hardware

   To allow for voltage drops, the voltage at the host port, hub port, and device are specified to be at least 4.75 V, 4.4 V, and 4.35 V respectively by USB 2.0 for low-power devices, [a] but must be at least 4.75 V at all locations for high-power [b] devices (however, high-power devices are required to operate as a low-powered device so that they ...

7. USB4 - Wikipedia

   en.wikipedia.org/wiki/USB4

   USB4 Gen3x2 cable (40 Gbps) with 100 W Power Delivery. Universal Serial Bus 4 (USB4), sometimes erroneously referred to as USB 4.0, is the most recent technical specification of the USB (Universal Serial Bus) data communication standard.