USB is the abbreviation of Universal Serial BUS in English, and its Chinese abbreviation is "through line"; Supports the plug and play and hot swap functions. USB was developed in 1994 by Intel, NEC, Compaq, DEC, IBM (Microsoft, NorthernTelecom) and was released in version 0.7 on November 11, 1994, which has since evolved into version 3.1. USB has the advantages of fast transmission speed, easy to use, support hot swap, flexible connection, independent power supply and so on. USB authentication is also called USB-IF authentication. It is a voluntary signature authentication implemented by USB ImplementersForum(USB-IF).

一、USB standard type

1. Connector

USB2.0 standard type: USBA male head, A female seat; USBB male head, B female seat; MiniUSB male head, female seat; MicroUSB male and female;

USB3.0 standard type: USBA male head, A female base; USBB male head, B female seat; MicroUSB male and female;

USB3.1 standard types: TypeC male head, TypeC female seat;

2. Cable

USB2.0 standard types: USBAtoB, USBtoMiniB, USBAtoMicroB

USB3.0 standard types: USBAtoA, USBtoB, and USBAtoMicroB

USB3.1 standard type: TypeCtoTypeC

二、Test content

Certification tests for USB peripherals fall into three broad categories. The first is the electrical characteristic test to verify the signal quality of the product under different application architectures. This is followed by functional testing, which examines higher-order product details such as support for standard requirements and device enumerations. Finally, the product interoperability test is used to determine how the product under test interacts with other USB devices.

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