Most new IP based security cameras allow for Power over Ethernet (PoE) operation and this is now established as a way to reduce installation cost while improving reliability and easing management’s job. Since 802.3af PoE is limited to about 12 watts maximum load, the operation of PTZ cameras is generally considered beyond the scope of the method. While the pending higher powered 802.3at standard is still but a future promise, all is not lost.
Many of the newer PTZ cameras (such as the Axis 215) can be run on DC power and require less than 25 watts. There are several companies (such as Power Designs and Phihong) that offer external (midspan) power injectors and splitters that can easily deliver enough power for such cameras. The site Power Over Ethernet is a good resource for information on this equipment.
We have completed several project designs using these high powered PoE systems with good results and large savings in installation costs. Keep this idea in mind for your next design or installation.
