Power-over-Ethernet Injectors and Splitters A PoE (Power-over-Ethernet) device is one which draws its operating power from the Ethernet cable instead of requiring a local power supply. It uses a standard Ethernet 'CAT5' cable but the power has been inserted at the far end using otherwise unused wires of the 4-pair cable. This is ideal for locations where mains power is not available or where you wish to reduce clutter. Typical PoE devices are IP Phones, IP Cameras or Wireless Access Points. Power-over-Ethernet is commonly provided by a PoE Ethernet switch - that's one which combines the regular Ethernet data signal into the same cable as the device power. Each port on the switch is able to power a remote PoE-enabled device. At the other end of the cable, the device can split the power and data back out again. A PoE switch might provide as many as 48 ports.
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