I've been designing my own CMM5 for a while now. Gigabit, sync for ePMP (w/sync), 450, 450i too. Run 12v to the site monitor and 48v to the sync injector. If more than 4 radios needed, then daisy chain another sync injector. Works fine.
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NICE!!! I'm still waiting to hear about Cambium's CMM5. I posted a question in the PMP450 forum and no one replied.
If you have a SiteMonitor Base-II, then it will take 10-60VDC. So no need for the additional 12V supply. Unless of course you're using that for utility power monitoring, which is what I do, but input-1 still gets whatever my common DC rail voltage is. Next problem is those mixed 24 and 48 volt sites, but Forrest is working on his universal dual-voltage rail PowerInjector + Sync modules, which are going to be awesome.
Packetflux site says to not power the site monitor gear with anything over 40v so I never tried 48v. http://manuals.packetflux.com/index.php?page=powering-the-base-unit
I always have those 12v power adapter lying around so I just cut the pigtails and wire it up with 12v.
Once we migrate totally off older canopy stuff, we will be done with 24v. I suspect that is the direction this mysterious CMM5 will head towards as well.
You scared me for a second! Most of our Site Monitors are 48V. I just checked again, the Base Unit II can take up to 56V
Well, I guess that's good to know. Now I can just start buying 48v rail power supplies. Even better!