I have a lorex NVR system. If I plug the cameras into the NVR directly all is good. But if I plug the cameras into the switch cameras do not show up on the monitor. If I go into camera registration on my system the cameras(4) all show up as showing they are live Status is good etc. but nothing on the monitor. So I know the switch is patching each individual camera through. Lorex tech support says that I have to use one of there switches otherwise they cant help. I find it hard to believe that you can only use a lorex POE switch and make it work.. I am using a mokerlink POE-F042F poe switch with a Lorex N843A8 NVR. If I connect 1 of the poe ports on my NVR to the uplink on the switch and connect one camera to a poe port on switch 1 can get one camera to show up on monitor but not 2 cameras. Going from the networking port on NVR to the up link port on switch doesnt let anything show on monitor. I hope someone can pleas help me with this issue. I really cant afford to spend $300 on a switch. ( if I put this in wrong category let me know. Im a newbie)