here are two situations when PoE splitter is used in a network: One is the network in which PoE switch and non-PoE devices to get powered requires a connection; another is the network in which data is sent through non-PoE network switch or router connecting with PoE compliant or non-PoE compliant end devices.

As shown in the following figure, the power sourcing equipment—the PoE switch provides power source via the Ethernet Cable. In this situation, the input cable of PoE splitter can connect with the switch directly. One output line supplies data and the other power. When a splitter receives a unified PoE signal, it then separates the data and power into the two different lines to the non-PoE end devices such as IP cameras and wireless access points.