PSE - Computer Definition
In power over Ethernet (PoE), equipment that serves as power injectors to provide output of 48V DC power over the twisted-pair cable plant to terminal units with PoEcompliant devices known as powered devices (PDs). For devices not PoE-compliant, splitters inserted into the Ethernet cabling provide 12V or 6V DC output. See also DC, PoE, and splitter.
(Power Sourcing Equipment) A power over Ethernet (PoE) device that is a source of power, such as a PoE Ethernet switch. Contrast with "powered device" (PD), which uses the power, such as a network camera or IP phone. See PoE.