[Alan Anderson]

If you determine that the power connection to the OM5P is flaky, you can use its 12-24V Power Over Ethernet feature to power it. To make a "passive POE injector", I have spliced into a short Ethernet port extender in order to connect a red wire to the blue and white-with-blue-stripe pair in the cable, and a black wire to the brown and white-with-brown-strip pair. Those red and black wires become the radio power input (from the VRM).

I didn't want to have 12v on the RoboRIO's ethernet, so the power only goes to the female jack on the port extender. The male plug goes to the RoboRIO, and a standard Ethernet patch cable connects from the extender to the OM5P.