This is for driving two POE devices off one cable. If you have an extremely long run for one camera and you needed to add another, this would be a great solution. Plugged into two POE+ ports at the switch which uses one CAT6 cable and at the far end it splits to two POE ports that you have a splitter for Ethernet and 12-Volt to run a powered mic and camera and the other is just running another POE camera. Another solution would be having a splitter for Ethernet and 12-Volt and one for Ethernet and 5-Volt. You can also run a camera and power injector if you want. Each connected device requires a separate router/switch port. Only 10/100 is supported over 2-pairs according to Ethernet standards. It supports 802.3AF PoE applications.