A brief description of USB
USB is the English acronym for Universal Serial BUS, Chinese meaning is "Universal Serial Bus." It is not a new bus standard, but in the PC field of application interface technology. USB is the end of 1994 by Intel, Compaq, IBM, Microsoft and other companies jointly proposed. But until recently, it has been widely used before. From November 11, 1994 version of USB V0.7 released later, USB version has gone through years of development, up to now has been developed for the 2.0 version of the current expansion of the standard computer interface. At present, the main motherboard is USB1.1 and USB2.0, the USB version of the USB plug with a 4-pin plug as standard, the form can be used to daisy chain all of the peripherals connect up to 127 can be connected to external equipment, and no loss of bandwidth. USB needs of the host hardware, operating systems and peripherals support the three will work. The current motherboard is generally used to support the USB function control chipsets, motherboards are also equipped with USB interface socket, the socket and back in addition to, the motherboard also has USB pins is reserved, can be received through the connection box USB interface as a front in front of the convenience of the users (note tha
t in connection to the motherboard manual to read and plans to connect must not be wrong then the damage of equipment). And USB interface can also be connected through a special USB drive to achieve two-plane interconnection line and can be extended through the Hub's interface more. USB has a faster transmission speed (USB1.1 is 12Mbps, USB2.0 is 480Mbps, USB3.0 is 5 Gbps), easy to use, support hot-swappable, connect flexible, independent power supply, etc., you can connect a mouse, keyboard, printer , scanners, camera, flash disk, MP3 machines, mobile phones, digital cameras, mobile hard drive, external floppy drive light, USB card, ADSL Modem, Cable Modem, etc., almost all of the external equipment.
USB is an external bus standard for the specification of computer and external device connectivity and communications. USB interface support equipment features plug-and-play and hot-swappable.
USB interface can be used to connect as many as 127 kinds of peripherals, such as mouse, modem and keyboard. USB since the introduction in 1996, has been successfully a
lternative serial and parallel port, and today a large number of personal computers and intelligent devices will be assigned one of the interface.keyboard什么意思中文
USB version
The first generation: USB 1.0/1.1 transfer rate for the maximum 12Mbps. Launched in 1996.
The second generation: USB 2.0 transfer rate up to the maximum 480Mbps. USB 1.0/1.1 and USB 2.0 interfaces are mutually compatible.
Third Generation: USB 3.0 maximum transfer rate of 5Gbps, downward compatible with USB 1.0/1.1/2.0
USB applications:
With the rapid development of computer hardware, peripherals, more and more keyboards, mice, modems, printers, scanners already known to all, digital cameras, MP3 players one a
fter another, so much equipment, how to access a personal computer? USB is generated based on this objective. USB is a computer peripheral device is connected so that the standardization of a single interface, the specifications are from Intel, NEC, Compaq, DEC, IBM, Microsoft, Northern Telecom established contact.
Standard USB1.1 interface transfer rate of 12Mbps, but a USB device can only get a maximum bandwidth of 6Mbps. Thus if an external drive, can take up to six-speed CD-ROM, can not be high. Standard USB1.1 interface transfer rate of 12Mbps, but a USB device can only get a maximum bandwidth of 6Mbps. Thus if an external drive, can take up to six-speed CD-ROM, can not be high.
A USB interface can theoretically support 127 devices, but is still unable to achieve this figure. In fact, for a computer, the peripherals around the next few of the more than 10, so this figure is enough for us to use.
USB also has a significant advantage is that support hot-swappable, meaning that in the case of the boot, you can safely connect or disconnect USB devices, true plug-and-play.
However, not all of the Windows system support USB. At present, Windows system, there are many different versions, in these versions, only the above versions of Windows98 system better USB support, while the other version of Windows does not support the integrity of the USB. For example, the retail version of Windows95 does not support USB, and only later bundled with the PC version of Windows95 support USB.
Windows95 versions in order to support USB.
Although USB devices are currently widely used, but it is more common USB1.1 interface, it is only the transmission speed of 12Mbps. For example, when you use USB1.1 scanner scan a picture of the size of 40M, the need for as long as 4 minutes. At such a pace, so that users find it very inconvenient, if there are a few pictures to scan, then you must have very good patience to wait any longer.
User demand is the driving force promoting the development of technology, manufacturers are also aware of the bottleneck. At this time, COMPAQ, Hewlett Packard, Intel, Lucent, Microsoft, NEC and the seven manufacturers PHILIPS this jointly developed the standard
USB 2.0 interface. USB 2.0 will transfer data between devices increased the speed of 480Mbps, faster than USB 1.1 standard to about 40 times speed improvement for the users means that the greatest advantage is that users can use to more efficient external equipment, and has a wide range of speed peripherals can be connected to the USB 2.0 line, but without worrying about the data transmission bottleneck effect occurred.

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