USB2.0 interface, USB3.0 interface, MINI USB interface, MICRO USB interface, HDMI series interface, FPC connector, 1394 series and other products, USB3.1Type-C interface, USB 2.0 socket A-type single-layer 90 degree encapsulated rubber mother base, USB2.0 side vertical plug interface A mother 13.8 long, fully covered, dustproof, fireproof, and high-temperature resistant, USB AF connector mother base 10.0 vertical direct plug 180 degree without curling, AF USB 90 degree direct plug 2.0 charging interface, USB adopts four wire cable, two of which are serial channels used for data transmission, The other two provide power for downstream devices. For high-speed and high bandwidth peripherals, USB transmits data at full speed of 12Mbps; For low-speed peripherals, USB transfers data at a transfer rate of 1.5Mbps. The USB bus will automatically and dynamically switch between two transmission modes based on the peripheral situation. USB is a token based bus. Similar to Token Ring network or FDDI token based bus. The USB host controller broadcasts the token. The device on the bus detects whether the address in the token matches itself, and responds by receiving or sending data to the host. USB manages USB bus power by supporting suspend resume operations.

The host, also known as the root, root node, or root hub, is installed on the motherboard or as an adapter card on the computer. The host contains a main controller and a root hub, which controls the flow of data and control information on the USB bus. Each USB system can only have one root hub, which is connected to the main controller.

A hub is a specific component of the USB structure that provides points called ports to connect devices to the USB bus, detect devices connected to the bus, and provide power management for these devices, responsible for bus fault detection and recovery. A hub can provide energy for the bus, as well as for itself (receiving power from external sources). Devices that provide energy for themselves can be plugged into the hub that provides energy for the bus, but devices that provide energy for the bus cannot be plugged into the hub that provides energy for themselves or support more than four downstream ports. For example, when the bus provides energy for devices that require more than 100mA of power, they cannot be connected to the hub that provides power for the bus.

Functional devices are connected to the bus through ports. USB can also be used as a hub.