With Great Power ... ORGANIZATIONS THAT OPT FOR HIGH-POWER POE PRODUCTS ARE PURCHASING PRODUCTS THAT ARE NOT STANDARDS-BASED

摘要

POWER OVER ETHERNET (POE) IS THE relatively new ability to provide low power, along with data, to devices via standard Ethernet cable. PoE, however, is not so new that it already hasn't been standardized by IEEE. As explained in this issue's Bandwidth column on PoE, IEEE's spec defines the powered device (PD) and the power sourcing equipment (PSE), a separate device typically installed in the wiring closet near the Ethernet switch or hub that inserts dc voltage onto the twisted pair cable and can be either an endpoint or a midspan device.