what is passive expansion device
Passive POE usually refers to any device using POE to power that is not 802.3af/at. This includes things like cameras and radio antennas that run on 24V POE. Passive POE does not do a hand shake so it is extremely important to know what POE voltage your device requires before plugging in the CAT5 cable and powering it up. If you connect the wrong voltage you can easily burn up your device.