Power over Ethernet
From SpinetiX Support Wiki
Power over Ethernet (PoE) is a standardized method of providing DC power over the unused wires in Cat5 cabling. It is commonly used to avoid the need for an external power supply.
If you need to use PoE with players without support for it, you can employ a separate PoE splitter, which sits between the network cable and the player and transfers the power onto a standard DC jack which is plugged into the player. Such products can be found on Internet - here is an example: Level One POS-3000 PoE Splitter (this product has not been tested by SpinetiX).
The PoE splitter must meet these specifications: