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+12V Power-Over-Ethernet Application Kit - Hardware Reference
1 Overview
This document defines the characteristics of the PoE application kit board. This application kit
provides a reference design for PoE on the Power Device side using National LM5070 device.
The POE_12V_JS board is an extra-power module which can be plugged on the Digi JumpStart
development boards, providing +12V power supply to the JumpStart boards.
1.1 Introduction to PoE
Ethernet is becoming the standard communication interface of peripheral devices beyond
networked computers. In a PoE environment the Ethernet not only transports data between
computers and devices, but also provides power so that connected PoE capable devices do not need
separate power supplies.
Power over Ethernet gradually has became an industry standard and is covered by IEEE 802.3af.
The proposed standard can accommodate power over either the data transmission pairs or the spare
pairs of the Ethernet cable.
There are two sides to the Power over Ethernet system. The side that provides power is called
power Source Equipment (PSE) side, and the side that consumes power is called Power Device
(PD) side. A detection scheme is designed to detect if there is PD connected at the destination. This
prevents applying power to a non PoE system.
After a PD is detected the PoE sides has to match the power delivering capability of the PSE and
the power consumption of the PD. This is called power classification stage.
After a valid classification is determined and a match between PSE and PD is found, the PSE
applies a nominal 48V DC across the power delivering lines. The PD regulates the power down to
its needs.
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