PoE, or Power over Ethernet, is a technology that describes a system to transfer both electrical power and data to remove devices using standard twisted-pair cable in an Ethernet network. In many circumstances, supplying power separately is infeasible, expensive, or just plain inconvenient, and a switch module that offers PoE enhances a network’s versatility and makes it more attractive to network administrators. A good comparison is POTS telephones. Like a network with PoE, POTS telephones are analog, but receiver data and power through the same cable. You may also hear PoE referred to as ‘inline power.’
Power over Ethernet is useful for powering embedded computers,wireless LAN access points,IP telephones, remote network switches, and network cameras as well as other I.T. hardware that needs power. PoE is typically implemented following the specification guidelines in IEEE std. 802.3af-2003.
Industry leader Cisco Systems is the father of original PoE equipment. Cisco was manufacturing components with inline power several years before an IEEE standard for delivering PoE came to be. With a capability of delivering up to 10 Watts per port, Cisco PoE forerunners ensured the amount of power to be delivered was negotiated between the endpoint and the Cisco switch. This was based on a power value added to the CDP, or Cisco proprietary Cisco Discovery Protocol. But CDP does even more. It’s responsible for communicating the Voice VLAN value from the Cisco switch to the Cisco IP Phone as well.
Now, you will find many products on the market that offer PoE. Cisco is still providing hardware on the cutting edge of this technology with products like PWR-C45-1300ACV and PWR-C45-4200ACV.

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