USB, the abbreviation of universal serial bus in English, is an external bus standard, which is used to regulate the connection and communication between computers and external devices. It is an interface technology applied in the field of PC.
Universal serial bus (USB) is a new data communication mode which gradually replaces other interface standards. It was jointly developed by Intel, Compaq, digital, IBM, Microsoft, NEC, Northern Telecom and other computer companies and communication companies in 1995, and gradually formed industry standards. As a kind of high-speed serial bus, USB bus's extremely high transmission speed can meet the application environment requirements of high-speed data transmission, and the bus also has the advantages of simple power supply (bus power supply), convenient installation and configuration (plug and play and hot plug are supported), simple expansion port (127 peripherals can be expanded at most through the hub), diversified transmission modes (4 transmission modes ）, as well as the advantages of good compatibility (downward compatibility after product upgrade).
Since its introduction, the universal serial bus has successfully replaced serial port and parallel port and has become one of the standard expansion interfaces and necessary interfaces for a large number of computers and intelligent devices in the 21st century. Now it has developed to USB version 3.2. USB has the advantages of fast transmission speed, convenient use, hotplug support, flexible connection, independent power supply, etc. it can connect a variety of peripherals such as the keyboard, mouse, large-capacity storage device, etc. the interface is also widely used in smartphones. The interaction between intelligent devices such as computers and external data is mainly based on network and USB interface.
The USB connector can only be nominally inserted in one way. It is possible to force a wrong connector, but this can cause damage to the device.
2. At least four contacts
All USB connectors have at least four contacts (some USB models may have five, USB 3.0 connectors or more), which are used for power, ground and two data lines (D + and D -). The USB connector is designed to transmit 5V up to 500mA.
The USB connector is shielded, so it provides a metal shell that does not belong to the circuit, which is very important to keep the signal intact in the environment with a lot of electrical "noise".
4. Powerful power connection
It is very important for the power pin to establish a connection before the data line to avoid trying to power the device through the data line, which is taken into account in the design of all USB connectors.
5. Mould strain relief
All USB cables are plastic-wrapped at the connector to prevent pressure on the cable and damage to the electrical connection.
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