Any suggestions for running the Netonix WS-12-250DC in a -48VDC environment? On it's own, it works great, powers up, etc. With UBNT Titanium 48V radios, it also is working great. When we plug in 24V RocketAC Lite radios, the ground plane of the RPSMA connector, is bonded to the tower (via the antenna) which then sends -48V through the radio and out pins 7,8 down to the switch to the return (which is the positive 48V connector on the switch). This fries the ethernet port that the netonix is plugged into, not bad enough that it dies entirely, but it's no longer capable of delivering power or data on pins 7,8. So you're limited to 10/100 ethernet, no power.
Most of our sites are +48V, but when we have to share sites with other telco providers, we end up in situations like this. I'd love to hear any recommendations you might have. For the record, our typical fix is to feed the +48V device with an isolated DC/DC power supply, but in this case when we connect the netonix to it, the power supply shuts off, probably a polarity protection circuit, but we can't see any voltage passing between the chasis of the power supply and any of the isolated power leads.....stumped.
