PoE injectors are a cost-effective way to add PoE capability to existing networks. They insert power onto the Ethernet cable, allowing non-PoE network switches to support powered devices. Cisco Discovery Protocol (CDP) with power consumption: The powered device notifies the device of the. When Ethernet switches or other devices have no PoE function but need to support PDs (Powered Devices) like PoE IP cameras, PoE wireless access points (WAP), PoE lighting, etc., And then How can i make my ethernet switch to poe switch? Acctually, one tool can help us! That is POE Injector! A PoE. This guide explores the core components that make PoE possible, including injectors, switches and splitters. While most Cisco Catalyst switches deliver PoE out-of-the-box, proper configuration and planning are crucial to prevent.