Based on your Network configuration you can plug your phone to the back of your PC NIC Card then plug the phone to the Data Port were your computer was plugged in to.Also plug in the Power Supply

If you have a separate cable to plug your phone then connect the Network cable to your extra data jack with you have a POE Switch you will not require the power supply.

If your phone has no LC D display check the connection were your POE is to make sure its connected and you have a link light on the port of the POE