Ok, finaly some good news. I tested with POE adapter and the cams works. So it look like that the NVR can't supply enough power to power the adapters and cams.
Hi, I buy 14 pairs of LR1002-1ET/EC adapters, and connect the cams with HIKVision NVR DS-7616NI-K2-16P. The problem is that only 3 - 4 cameras work at the same time with the NVR poe. When I power more cams, the LR1002-1ET is not establish the link with LR1002-1EC. I suppose that the problem is...