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Power over Ethernet (PoE)
Power of Ethernet is a idea (a technology) that deliver power through a ethernet cable that is everywhere.
That sounds good ! but why we need this ? I don't think you need me to answer this question. If you think in a couple of seconds, you may figure out the answer on your own.
You would see a lot of electric product (e.g, Survailence Camera) that can be connected to ethernet cable. You can install those product almost anywhere pretty far away from any ethernet outlet at your home, office etc. It may be as far as almost 100 m and get it connected to ethernet. Ethernet connection is no problem here.. but you would not face any issues with ethernet connection. However, you would face difficulties with power supply. Extending power cable from the outlet on the wall to a location which is 100 m away would not be that easy and cost will be much higher than the ethernet cable not to mention to messy cabling.
How convinient it would be if we can make the ethernet cable provide the power and ethernet connectivity ! This is the main motivation on PoE (Power over Ethernet).
For more details, refer to following links. You will see very nicely illustrated/summarized explanation on PoE.
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