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Role USB interface - Data line is how to change the mobile phone data into the computer?

Shenzhen STC Cable Manufacturer | Updated: May 16, 2016

Now, everyone seems to go out the wallet, bus cards can not bring what's that they can not forget to bring your phone. The phone is occupied square aspect of our lives has become a necessity. See interesting things, dinner, tasty snacks, met a beautiful flower ...... we will not help, "Kaka Ka" to shoot a few. When the mobile phone memory card full, we will naturally put them upload the clouds, then brush brush erase the phone memory. But, you know, all kinds of "cloud" services, is the new stuff before the rise in recent years, in the meantime, we want to transfer the data in the phone, the computer, or your favorite music and movies downloaded to your phone , all need a data line yo. A data line connected to the computer, plug the other end of the phone ...... so a row, is not charging well, ye data transmission success?

Here to introduce a key technology: USB (Universal Serial Bus), translated into Chinese is "Universal Serial Bus", referred to as "through-train line", it is also a technical standard. Today, USB technology has been quite extensive, it can be connected to a computer device, mouse, keyboards, printers, cameras, digital cameras, mobile hard drives, mobile phones and so on for various uses. The most common USB interface is a flat rectangle, if the interface facing you, you can see four yellow metal, which is called 4 "needle", each a "needle" is like a road, as the road with cars traveling on the same token, the data transmission in the "needle" on. Specifically, the two outer needles, the power lines: one is the ground (GND), the other is the positive power supply line (ACC), a standard supply voltage of 5 volts. These two lines responsible for the equipment connected to the power supply, so we can think, thumb drive itself does not have the battery, plug in the computer can use, because there are two lines supply, drive it to work. USB connector and two pins in the middle, is the real transmission of data, named "D +" and "D-".

Process of transferring data is like driving a car on a bridge. In the computer world, information is represented in binary, that is, with many "0" and "1" on behalf of a combination of information. As a simple example, the decimal numeral "1" corresponds to the binary "001", "2" corresponds to "010", "3" corresponds to "011", "4" corresponds to "100", and so on. With a combination like this, "0" and "1" can represent a wealth of information. Imagine a cross-sea bridge on both sides is similar to computers and mobile phones, to transfer data between the two devices, like the sea side of the car to open to the other side, each vehicle is filled with "0" or "1" information. However, the width of the bridge is limited, how do we make car drove past? The first scenario, only repair one lane, allowing only open car from east to west, so the most convenient, low cost, high efficiency because no traffic jams, but the drawback is that only one-way transmission, there is a great limitation, with jargon is called "simplex mode." The second solution, or building a driveway, allows both from east to west and from west to east allowed, but when heading west to east to open the car to wait, and vice versa, so that can be a two-way transmission, there is no increase in cost, but efficiency is limited, because there is always a side to wait, jargon is called "half-duplex mode." The third option, repair two lanes, from east to west and from west to east can also open the car, so to achieve a two-way transmission, efficiency is guaranteed, but the cost is doubled, jargon called "full-duplex mode."

USB standard uses "half-duplex mode", and by detecting the voltage difference to distinguish between "D +" and "D-" between the lines "0" and "1." The so-called "serial" is that data is arranged in time, a fixed voltage changes every time a transmission line, while the other end devices detects a voltage at the same rate, "read" the data, thus to achieve a "serial" data transmission. This is like saying, and methyl acetate before have 10 color brush, they did not see a face, you can communicate by telephone; two of appointment, in turn say the pen colors, such as red, yellow, green when ...... a turn to say 10 after the color, B will be able to brush in good order, and this order is exactly the same armor. That is, A B will be passed to the pen color sorting information by way of "serial" communication. Typically USB can be transmitted per second on one million bits of data, that is to say within a pop twenty-three seconds of transmission can be completed. It is often said that "bandwidth." "Bandwidth" refers to the transmission line is not actually how "rough", actually refers to transmission how "fast", and this performance and standards related to the use of the equipment.

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