Passive PoE. Injects power into spair pairs on a standard ethernet cable. Suitable for use with our Routerboards and Power Supplies. Plug your power supply and LAN into this, the power is transmitted over the cable which is then connected to the "POE" port. All Routerboards accept power in this method by default, therefore no "splitter" is required on the other end, just plug the network PoE cable straight into the Routerboard.