Power-Over-Ethernet: The Reality Of Designing A Powered Device
by by Tony Morgan Silver Telecom Ltd

There have been many technical articles, white papers and product application notes that explain the theory on how to make a PoE powered device. They give an overview of the IEEE 802.3af standard for power-over-Ethernet and explain how to extract the power from the CAT5e cable. The following is a practical guide to help take that information and to design a PoE-enabled powered device.

The powered device (PD) can be broken down into four basic building blocks…

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