SB line ring definition: USB cable ring, it simply is installed from interference in USB line ring, nickel zinc magnetic ring. USB data cable is now mainstream, the advantage is to facilitate fast and stable support for all types of computer; the disadvantage is the higher price band IC, another part of the data wire brush machine function is not supported. USB is the most widely used applications on the external bus standard PC field, a specification for a computer with an external device connection and communication, Plug and Play USB interface supports hot swap function devices. With the rapid development of computer hardware, USB applications increases the speed of data transfer between external devices and increase the speed of the greatest benefit for the user is that means that you can use to be more efficient and external devices, such as using USB 2.0 scanner sweep 4M a picture just 0.1 seconds or so, the working efficiency is improved. USB cable ring options: turns turns on the more the better low-frequency interference suppression, high-frequency noise suppression effect is weak. Actual use of them according to the number of turns magnetic interference current frequency characteristics to adjust. When the wide-band interference signal can be set when the two magnetic ring on the cable, each magnetic surround different turns, so you can at the same time a high-frequency noise and low frequency interference. The larger the impedance of the inhibitory effect of not interfering signals, the better, because the parasitic capacitance, the parasitic capacitance and inductance in parallel exists on the actual ring, but the face of the high frequency noise, the parasitic capacitance of the inductor magnetic short circuit out of action . When suppress common mode signal interference signal can be uprooted differential signal lines or power lines across both positive and negative wire ring in order to increase the effect on the ring can be symmetrical around a few times to increase the inductance of the common mode signal to enhance the absorption effect but no effect on the poor touch signals. Components should be installed in a place near the source of interference. For the input and output circuits should be as close to the import and export of a shielded box. Filtering magnetic effect is usually much better than the large size small size filter ring, a larger core, multi-thread around a few times in the above.