Unable to detect the camera

I am not able to detect the camera (when connected in my LAN using a regular Ethernet cable) using IP setup program. I tried also to connect it with a cross cable directly to my computer and I used ARP commands. Nothing.
Could be the camera network interface not working? Whenever I plug the camera in my network, the Network LED on front of the camera doesn't turn on although at the other end (router, switch) the port LED turned on. The camera power LED is OK (is on).

Thanks