The origin of usb-if Association and various interfaces

1996 year , By Intel 、 Microsoft 、ibm And so on usb The standard came out , keyboard 、 mouse 、 Smartphones and printers are mostly used usb Standard to realize power supply and data transmission .

usb The purpose of interface is to achieve universality from the beginning . stay usb Before the birth of , keyboard 、 Mouse multi use ps Second interface , Game consoles have special game port, Printers and other peripherals , Also use serial port and parallel port connection .

usb Interface , Fast transmission speed 、 Easy to use 、 Flexible connectivity . And usb The standard itself does not require a licensing fee , So it soon replaced other similar standards . These old interfaces are almost invisible in today's computers , Have usb The interface can meet the needs of connecting most devices . Although we are USB4 In the future, we should see the unification USB C Interface , But now the status quo usb The standard has not yet been fully universal ,usb The standard is designed to meet the needs of different types of equipment , Quite a number of different kinds of interfaces are used .

decision usb The maximum transmission speed is not usb The form of the interface , It is supported by the interface usb edition , Even with the latest type c Interface devices , It may also only support slower usb2.0 Protocol transfer data .

The thunder and lightning protocol starts from thunder and lightning III type c Interface , This type c The interface supports usb The support for lightning protocol is added on the basis of the protocol , The transmission rate of lightning protocol is very fast , You can achieve 40g Bits per second . It can not only expand a considerable number of interfaces , It can also be connected to high-speed solid-state drives 、 High resolution display , Even an external graphics card . The emergence of thunder and lightning has gradually replaced the FireWire interface in the field of personal computers （IEEE-1394） However, thunderbolt is an agreement led by Intel , Thunder and lightning 3 free , But lightning 4 A licensing fee is required .

The price of equipment supporting lightning protocol is higher than that of similar equipment usb The equipment is much more expensive , Fortunately, Intel will thunder and lightning 3 The relevant technologies of have contributed to usb standard , bring usb4 Began to have almost the same characteristics as lightning .