SYV-solid polyethylene insulation, PVC sheath, the national standard code is radio frequency cable-also called "video cable". A coaxial cable used to transmit video baseband and analog signals, generally has two impedances of 75 ohms and 50 ohms , It can also be roughly subdivided into -3-5-7-9 and other models. Video cables are divided into SYV and SYWV according to different materials.