Analysis of the functions of common interfaces of

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With the emergence of various external digital devices, small interface selection has become important. When choosing a laptop, we should not only pay attention to its configuration, brand and appearance, but also the richness of interfaces is an important reference point. Today, I will analyze the commonly used interfaces

I. USB interface

everyone is familiar with it. USB is the most frequently used interface of notebook computers. USB is the abbreviation of universal serial bus in English and means "universal serial bus" in Chinese. After years of development, USB has now developed to version 3.1

at present, most USB interfaces of the models sold are 2.0 standard, and USB1.1 products have been eliminated. The theoretical transmission rate of USB2.0 is 480mbps, about 60mb/s, but the transmission speed in practical use is lower than this theoretical value

at present, the new USB 3.1 has the characteristics of fast transmission rate. Theoretically, it can reach 10Gbps, twice as fast as the previous generation, and can be downward compatible with USB2.0 devices. It is easy to distinguish. Generally, the interface of 3.0 and above is blue

II. HDMI interface

high definition multimedia interface (English: high definition multimedia interface, HDMI) is a digital video/audio interface technology, which is a special digital interface suitable for image transmission. It can transmit audio and image signals at the same time without digital/analog or analog/digital conversion before signal transmission

only one HDMI cable is needed to connect computers to TVs or large screens to enjoy high-quality video and audio. It was found that entertainment was retrieved at the supervision department station of the Central Commission for Discipline Inspection, and the current LCD TVs are equipped with HDMI interfaces as standard

III. LAN interface

lan is what we often call a wire interface. Through it, we can realize wired connection. At present, most notebooks are equipped with a wire interface, and some ultrabooks are limited by the design consideration of the thickness of the body, and will adopt a wire interface adapter to realize it. The concrete pressure testing machine measures and judges the performance parameters of concrete according to the national standard gb/t50081 (2) 002 "standard for experimental methods of mechanical properties of ordinary concrete". IV. VGA interface

vga interface is a computer display standard using analog signals proposed by IBM in 1987. VGA interface is a special interface for computer to output data with VGA standard. Generally, the VGA interface has 15 pins in total and is divided into 3 rows with 5 holes in each row

in addition, there are power interfaces, audio interfaces, etc. for computers of different brands and models, the type and number of interfaces will also be different

it is also important for computers to protect the interface. Daily maintenance should be "since the combination of PVC and graphene, the cost performance has been improved, and even the profit has doubled" waterproof, dust-proof, anti-static; light insertion, light extraction and more covering in the polymer category ", which is conducive to extending the life of notebook computers

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