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2. USB communications - Wikipedia

   en.wikipedia.org/wiki/USB_communications

   The idle line state is when the device is connected to the host with a pull-up on either D+ (for full speed USB 1.x) or D− (for low speed USB 1.x), with transmitter output on both host and device is set to high impedance (hi-Z) (disconnected output). A USB device pulls one of the data lines high with a 1.5 kΩ resistor.

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. Category:USB - Wikipedia

   en.wikipedia.org/wiki/Category:USB

   Download as PDF; Printable version; In other projects ... USB 2.0 Hi-Speed; USB 3.0; USB4; 0–9. Universal Serial Bus 0.7; ... USB communications device class ...

5. USB hardware - Wikipedia

   en.wikipedia.org/wiki/USB_hardware

   USB 2.0 provides for a maximum cable length of 5 metres (16 ft 5 in) for devices running at high speed (480 Mbit/s). The primary reason for this limit is the maximum allowed round-trip delay of about 1.5 μs. If USB host commands are unanswered by the USB device within the allowed time, the host considers the command lost.

6. USB hub - Wikipedia

   en.wikipedia.org/wiki/USB_hub

   To allow high-speed (USB 2.0) devices to operate in their fastest mode, all hubs between the devices and the computer must be high-speed. High-speed devices should fall back to full-speed (USB 1.1) when plugged into a full-speed hub (or connected to an older full-speed computer port). While high-speed hubs can communicate at all device speeds ...

7. USB4 - Wikipedia

   en.wikipedia.org/wiki/USB4

   USB4 enables multiple devices to dynamically share a single high-speed data link. USB4 devices must support a signaling rate of at least 20 Gbit/s. The current version allows signalling rates of 40 Gbit/s (since USB4, first version) and 80 Gbit/s (since USB4 version 2.0).