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Power Over Ethernet

Power Over Ethernet

Power over Ethernet (PoE) is a technology that enables Ethernet cables to function as power cords, at the same time as they are functioning as Ethernet cables:  DC electrical current necessary for the operation of one or more network devices flows over the same cable used for network connection.  POE injectors make use of free wires in the Ethernet cable to send power.

With PoE, one does not need power outlets at device locations, such as cameras and wireless routers.  

With fewer cables to install, the network has much greater installation flexibility, easier maintenance, lower cost, and less downtime, than with traditional wiring.

Passive POE injectors can accept any voltage and inject that voltage into the ethernet cable, for use by the WiFi router, bridge, or CPE.

Non passive injectors are able to transfer power up to 100 meters using active components and on the other hand.  The range of passive injectors is around 100-130 ft (up to 40 meters).


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