What are the reasons for the absence of signals in the closed-circuit monitoring system?
If you say yes, the extension cannot display the image or show no signal, and the host has an image with a signal. That's the network or the problem of setting up the extension software.It's about to be tested. If you have any questions, you can ask again.
If you say the host images do not display camera pass or display no signal, you can go directly to the camera to view whether power or whether the display, you can use a video detector and universal meter to complete. If not, that's the middle route. You can use the instrument above to measure back to the host in the middle of the section. If there is a problem with the camera, you can try it directly with a new camera to see if there is any problem with the middle line.
