PoE output of a NVR to another PoE source

[bentech 1]

Hi , 

I have a PTZ to install but the 17W from the PoE of the NVR is not enough so I need to use a external PoE source (60W).

Question : Can I connect the output of the NVR to the input DATA IN of the external PoE  ? Are the DATA IN pins are isolated to avoid PoE contention ?

I m assuming that the DATA IN is using only 2 pairs for DATA and the other 2 are not connect so the PoE output of the NVR should not damage anything.

 

Any idea ?

Tks !