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Power is supplied as a common-mode signal over two or more of the differential pairs of wires found in the Ethernet cables and comes from a power supply within a PoE-providing networking device, such as an Ethernet switch, or by a PoE injector, a PoE power source that can be used in combination with a non-PoE switch.
A modern switch may implement power over Ethernet (PoE), which avoids the need for attached devices, such as a VoIP phone or wireless access point, to have a separate power supply. Since switches can have redundant power circuits connected to uninterruptible power supplies , the connected device can continue operating even when regular office ...
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