The sheath, that is, the outermost layer is insulation layer, have protective effect, should use the black polyethylene that has fine weather characteristic outdoor cable, indoor user cable from beautiful consideration should use the polyethylene of light color.
Outer conductor (shield layer), the outer conductor of coaxial cable has a double function. It serves as a conductor of transmission loop, transmitting low level, and has a shielding effect. Outer conductor usually has three structures.
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