Power over Ethernet (PoE) maximum draw?

[BachmanS]

I have a Netgear switch that provides power of ethernet to the first 12 ports. Will using those to feed PoE devices drastically increased the power requirements of the whole switch or does it only affect it a little? And also is there any way to completely overload it devices that draw too much PoE power?

[Noodles]

The switch itself will use more power because it will be providing power to other devices. Most PoE ports are providing very little power for things like phones and wireless access points. It will use a good amount of power if you have a switch with 48 PoE ports. You want to check that the outlet your switch is plugged into can handle a maximum draw specificed in the manual. PoE swtiches will also generate a little more heat so make sure it has proper air flow. The netgear switch you are talking about is a lowend PoE switch and will not use alot of power or create excessive heat.

[GIBBION]

An IP phone uses about 5 watts of power. The power supplied is 48 volts DC. Multiply that by the amperage used (usually around .1) and you end up with around 5 watts of power.