On my system , Lorex DVR LHV2008 it has a connector on the back for what should be 2 wires, a yellow Positive , and a green wire , Negative. it is for the RS485 controls for PTZ, my PTZ camera has the same wires coming out of it with the BNC connector and power plug. I can't control the PTZ unless those extra wires are connected. Oh and I had to run a separate cable for those extra wires. hope that helps.