Ok, I have an issue, we're busy planning some corrective measures to move everything to -48v power on the sites, as that's what our batteries/rectifiers provide and off of our old 110v.
Now I already know that the CMM does NOT like -48v for the 56v port as apparently the way the cmm3/4 are designed they ground to chassis which when you reverse polarity on -48 to +48 by swapping cables it grounds out the entire cmm and causes huge issues.
No problem we're going to get Isolated -48 to +56v dc-dc converters for the CMM and 450's and an Isolated -48 to +30v also for the cmm and our old canopy 100's.
But we also have sites with a number of ptp500/600, mimosa's, etc. We're using PIDU PLUS's for the 500/600 and even mimosa's and they seem to work great on 110v and they even seem to work on -48v sourced power... (i guess swapped polarity), but I wanted to confirm with cambium and the other users, is this ok? can we power the PIDU Plus and rely on it to isolate properly the -48v to +48v power? Or do we need to use a -48 to +56v isolated dc-dc for those too?