What does J-Y YH mean?

It's a four-core shielded twisted pair, that is, a network cable, but there is a shielding layer in the middle, which will reduce interference after strong current during laying.

Twisted-pair transmitter generally refers to a device that uses a network cable to transmit video. Twisted-pair transmission uses the principle of differential transmission to convert video signals into video signals with equal amplitude and opposite polarity at the sending end. After two video signals with opposite polarities are transmitted through twisted pair, they are subtracted at the receiving end to become ordinary video signals, so the * * mode interference can be effectively suppressed. Even in strong interference environment, its anti-interference ability is far superior to coaxial cable. Moreover, by processing video signals, the transmitted image signals are also better than coaxial cables.