NID not passing POE through to radio

We have installed more than 20+ B5 links over the past year or so. We decided to use the Mimosa NID to properly ground the Outdoor Cat5e cabling coming from the radio (on the tower) into the building Network Closet. However, we could not get the NID to pass the power/POE to the radio. We had to put the NID behind the Power Adapter/Injector? This isn’t our best practice. We normally drop the Outdoor Cat5e cabling into a LPU or some type of surge protection before connecting to the Power Injector/Adapter.

This was the first time we used the the Mimosa NID and we didn’t know that it could not be inline!!

Tom Blumenshine

Hi @Tom8,

I think you already spoke with our Support team about this separately. The NID is a passthrough device with GDTs for lightning protection, and is definitely meant to be installed between the PoE and radio:

Since the B5 and provided PoE already have GDT’s, it may be that the introduction of yet another set of GDTs has increased capacitance to a point where Ethernet will not negotiate.

There are a couple of tests that can help get to the root cause.

  1. Perform a cable test through both sets of cables and the NID - testing them all as a system to look for wiring errors or another hardware problem.

  2. Substitute another PoE that does not contain GDTs to reduce the capacitance.

Please let us know what you find.

1 Like


Thanks for the follow up! This explains everything. It appears we’ll need to go back to our other Surge Protection Solution.

Tom A. Blumenshine
President/General Manager
Entre Solutions II


Thanks for the reply. I had talked with support and they also told us about the GDTs existing in the radios and POE adapters. That makes sense and we are still going to put the NID between the client’s network interface and the POE adapter. We have always traditionally put them inline on the tower and the point of entry into the building.

Thanks again,