Hi GadgetAssistant,
Thanks for the response, btw, what is meant by cam antenna?
All of our camera was using Poe for the camera, which means it in LAN network environment.
I think it is not the distance issue, since all cat6 cabel in our labs environment are less than 2m.
While onsite, all of the port trunk were using fiber cable. Cat6 cable are less than 100m.
PoE extender were equipped for those cable that are more than 100m.