Using cylindrical shaped anti-interference magnetic ring core is to improve transmission rate and the stability, also to reduced transmission line in transfer data Shi on other equipment, as sound card of interference, design has shielding layer. this shield layer is by a more thin of metal foil tablets or is more unit fine copper wire woven into mesh made, application of is electrostatic field of surface effect principle. is will data transfer line of appearance bread Shang a layer metal film, and will this shield layer and chassis for grounding, on can is good to will data line and space interference signal isolation!