If you tried to run the cam on 12 VDC ( most will) and the IR LED you'd have to split the 12VDC with a Y so as to power both. Now you've got a POE-capable cam that is not utilizing its main feature but is instead being fed power from a Y along with an IR LED and also you now have both a POE splitter and a Y
The above is similar to how I power external mics.
- POE enet to splitter input.
- Non-poe IP output from splitter to cam.
- 12V DC output from splitter to y cable input.
- Y cable DC output #1 to cam DC in.
- Y cable DC output #2 to mic DC in.
- Mic audio out to cam audio in.
This all fits in the junction box that I mounted the cam on. Nice: Using a single run of cat 6 cable to power both cam and mic.
Sure, I could run two Cat 6 cables, but needing to pull another cable is a headache, if the first Cat6 cable is already pulled.
If installing a new cam, that's different. Pulling 2 cat6 cable makes sense, since it "future proofs" the installation. Maybe a 2nd cam would be desired in the future? eg:
A) add a cam w/ 12mm lens to look long at a specific object of interest,
B) a PTZ,
C) have two cams cover an area, etc.
There's so many toys we might want in the future!
The powered mic doesn't consume much power at all. Looney2ns makes a good point, if you're considering IR LEDs, you must look at total power draw.
Fastb