I have a Silicom Brand PEG4BPI network card and am having some issues getting it to work. I have tried connecting the ports to my switch using cables I know to be functional, and yet nothing I have tried to connect them to the network has worked. In the network manager, all four ports are shown as "Network cable unplugged" but they are not. the green LEDs connected to the NIC on the switch side are lit up, but i cannot communicate with the network at all. Please help.