No, that is not true, it adds an additional ground on 3&6. So to obtain a gigabit connection you have + on 4&5 and - on 3&6, 7&8. All of the present day UBNT gear is like this since they added gigabit Ethernet. When we upgrade we add a jumper to 3&6 to get it to negotiate at gigabit, but they seem to operate at 100FDX without it.
On Tue, May 8, 2018 at 9:30 AM, Jacob Turner <ja...@happycycling.com> wrote: > The Prism Gen 2 uses "standard" UBNT passive 24v POE. +4,5 -7,8. I've > seen netonix switches claiming as much as 12 watts draw from one when > running. I wouldn't be surprised if their startup draw may be a bit higher. > > On Tue, May 8, 2018 at 8:16 AM, <ch...@wbmfg.com> wrote: > >> I need help in understanding a product failure. >> >> I have now had two customers with similar failures in my POE fuse >> product. The fuses are blowing. >> So far it is limited to the fuses on pins 4/5. >> >> One customer is using: >> UBNT 5AC Prism Gen 2 radio, Mikrotik 411 boards, using both poes and >> netonix as the power supply. >> >> What pins and polarities does that radio use for POE? How much current? >> >> I may need higher rated fuses or slower fuses. But I can only go so high >> before it is not protecting Netonix thus becoming an expensive CAT5 >> splice. >> >> My ideas so far: >> >> I need a slower reacting fuse. >> >> I need a higher amp rating fuse. (not sure how high I can go and still >> protect Netonix) >> >> Some loads have unanticipated currents on those wires. >> >> Plugging in when powered may cause a connection sequence problem where if >> pin 4 makes contact first the whole load will go through that wire and blow >> that fuse. >> >> > >
