I have an Ethernet (100 Mbps) camera powered through PoE by a PoE enabled switch. The camera is turned on and shut down by configuring the switch to cut the power on and off on the given port.
I want to have a visual indicator that the camera is on. So I did the following:
- Assembled a 9V-120V to 5V step down module, a resistor, and a LED.
- With a multimeter, determined which wires are used by the camera to get its 54V (which weren't, by the way, the commonly used wires 4 and 8, but rather wires 2 and 6).
- Connected the step down module to the wires 2 and 6.
However, it doesn't work. The switch doesn't seem to detect anything. If I unplug it, unsolder one of the cables leading to the step down module, and plug it again, the switch does detect the camera.
What can I do to find where's the problem?