The jumpers are setted correctly, i have an impression that fails load recognition phase of 3com PoE switch. nobody have experience with PoE switch in conjunction witch rb500 ?

I have a problem with RB500 PoE in conjuntion with 3com 2226-PWR switch. The router remain off and no ligth blink. With normal external power injector device all running good.

Have you any idea about ? there are compatibility problems with switch
that we use.