OT: CCTV problem

Did the problem start when you inserted the 4-port switch? If not, what changed between it working and it no longer working?

That would be a good idea.

Example of an NVR with 56 watts of POE available

POE |------- POE-CAM (works) NVR |------- POE-CAM (works) |------- POE-CAM (works) |------- POE-CAM (works)

No POE # Even with POE-Passthrough, a single port Passthru # from the source will not shove all available POE 30W |------- POE-CAM (no power) # power through one output port. For example |------- switch|------- POE-CAM (no power) # only 30W of 60W capacity, through one port. NVR |---/ |------- POE-CAM (no power) |---/ |------- POE-CAM (no power) |---/

Or use a device with its own POE source. This product is apparently out of production. I tried to find a picture of the adapter the switch uses, but was not successful.

Local POE POE |------- POE-CAM (works) |------- switch|------- POE-CAM (works) NVR |---/ |------- POE-CAM (works) |---/ |------- POE-CAM (works) |---/

You can also use injectors on the right hand side of the switch, to power the cameras. Which would be a mess of wires, but otherwise OK. The main advantage of the injector, would be independent failures on powering (shorting one camera won't affect the other cameras).

One of the reasons things like this are possible, is because the up-to-four-twisted-pairs are transformer isolated. This allows some tricks to pass additional functions (across 1,2,3,6)

It's hard to say where the ground reference is, in these pictures :-) Maybe someone who has installed stuff like this can comment on what they did and why.

Paul

There are some exceptions but if you plug the cameras into a switch, that switch needs to provide PoE.

Andy Smith pretended :

Thanks guys