If video is transmitted using a twisted pair, then the camera must be the webcam, and the signal transmitted by the network cable is likely to have network delay, which is not the case with ordinary video cable. In addition, ordinary video line cannot transmit audio signal. If you need to collect audio information, you need to spread the cable. If the network cable is not needed, you can directly transmit audio signal. In addition, some devices also support POE power supply, that is, you can supply power to the device directly with the network cable, without the need of additional power supply, ordinary video cable is unable to complete this function.