You may need to upgrade to the PoE network when accessing the PoE switch. On the other hand, the regular switch's access method requires installing a PoE injector. In this article we will uncover the subject matter of PoE switches and watch how they are necessary for the network design. Place this injector between the. In a basic PoE power supply system, the major components are the power sourcing equipment (PSE), the powered device (PD), and the PoE cables. Removed. A POE switch gives power to devices that support the protocol, like cameras and access points. A regular Ethernet switch does not provide PoE for supplying. Power over Ethernet (PoE) is a convenient technology that enables network cables to carry electrical power, eliminating the need for additional wiring. However, PoE setups can encounter various issues.