Well the long and short of it is that I have a fairly new and fairly expensive PoE surveillance camera and from my own testing I believe that the camera has just shorted itself out internally and taken two PoE power supplies down with it. I’d like to verify this though and I lack the experience or equipment to do so. This is a cry for help .
“Well I’d like to help. What help specifically do you need?” you ask. Thank you and excellent question. Here’s some thoughts on that:
- Other than this possibly-shorted-out camera, I don’t have any PoE equipment to test my power supplies. Anybody have some PoE stuff I could try the supplies out on to confirm whether they are working or not?
- I tried measuring voltages across the pins on the PoE supplies and got nothing. I’m not convinced that means anything because I don’t have the experience to know if there may be an initial autonegotiation going on before voltage is applied. I know there exists PoE testing equipment that would be more conclusive. Anybody have access to any of that?
- That camera: I don’t know if there exists some sort of current-limiting PoE power supply that I could try with the camera so I can see if it is actually shorted without blowing another power supply (if indeed they are blown).
Other stuff to know: I opened one of the power supplies and it smelled a bit burnt. So does the camera for that matter. I found a soldered-in fuse inside the power supply and it tests good. I’ve tried multiple cables which I know are good (tested each pin individually with a continuity tester and looked for shorts) so I have ruled out that a cable is the issue. But yeah the plugs on the original cable don’t look too happy. I think they’ve seen a bit of “intense electron action.”