High powered PoE limits.

[jmargolis79]

I just started working with PoE cameras. I have to install a high powered PoE PTZ camera and I am around 150 ft away from the switch. I was wondering if their is a limit to the cable length?

 

[wireguru]

heres a question: is it real 802.3af PoE or is there a proprietary injector that came with the camera? 802.3af works the full 100 meters, but only delivers 10 watts which makes me believe the camera uses a proprietary injector where you could do voltage drop calc or consult manufacturer.