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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Overview
In Chap. 1 we learned that local area networking (LAN) started years ago, took different forms, then slowly evolved into its present incarnation which we call Ethernet. The idea of sending power over data cables too started much the same way, quite disparately, before it settled down to what we know today as PoE. To a systems and IC designer, that is sometimes a blessing and a disguise: He or she knows very well what to do, unfortunately that is all that can be done. Functioning within the constraints of a carefully defined standard may seem to stem creativity at times. In the interest of ensuring interoperability, a certain amount of excitement and innovation may have gone missing, lost forever somewhere in ether.
A few years ago, ...

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