The B5-Lite/C5 has a separate ground lug. Grounding via the PoE alone is not recommended. We’ve had a B5-Lite (same h/w as C5) crash in the field with static buildup as the most likely cause, attributed to lack of a separate ground. While most B5-Lites will go on towers or high spots where it might be possible to find a real ground (easy on towers), C5s are a different story.
There’s no easy way to put a ground on these at most sites. I looked at PoE connectors whose shells had ground lugs, but the ground on the C5 is outside the gland, so running the wire through the gland opening might compromise the seal. Competing WISP client radios do not use separate grounds. An installer is not expected to show up with a ground rod, sledgehammer, and outdoor wire to the radio up on the roof! (Especially here where the ground is largely ledge rock.) It would not go over well with most customers, and would hugely add to the cost of installation. Saving a few bucks on the C5 while requiring a ground wire is false economy. CPEs need to be robust enough, grounded only to the indoor PoE.
We hope to try a group of C5s and C5c’s in the field this summer. I don’t know if the C5c will need a separate ground, but many houses will have them with an external dish, to get the higher gain. But again it won’t be on a metal tower.
How do others feel? Mimosa?