Black Box LPD504A Transceiver/Media Converter

Bridge long-distance Fast Ethernet fiber optic segments with Ethernet or Fast Ethernet copper cabling-all without the need for a local power supply-by using a BLACK BOX® PoE PD Media Converter.
Compatible with the 802.3af PoE standard, the converter features an advanced autosensing algorithm that enables it to function as a powered device (PD) and draw its power from PoE power source equipment (PSE) or a PoE injector.
With PoE, both data and power are delivered over the spare pairs of an Ethernet data cable to compatible PoE devices-a method of power delivery that's beneficial in areas where you're short on AC power outlets. It also eliminates having to run separate AC power wiring to devices at the edge of your far-flung LAN.