SYV refers to solid polyethylene insulated coaxial cable, and the national standard code is radio frequency cable - also known as "video cable”. The video cable generally referred to is TV cable, and can also be used as a cable for surveillance cameras in the field of security.
The transmission of video signals is a coaxial cable used to transmit video baseband analog signals, used for closed-circuit monitoring, video conferences, video intercom systems, etc. to transmit analog signals.