Thanks for the info. I did check the chassis ground vs dc return on my dragonwave radios, and they weren't bonded. I'll check with dwave to see if they are cool with 0v input and +48v return. If so, we will buy +48v DC systems in the future.
For the -48v ICT we already have, I was looking at this Meanwell isolated DC-DC converter; do you think it would work? https://www.mouser.com/ProductDetail/MEAN-WELL/SD-500L-48?qs=umBTOZqEewis66%252Betk6pyQ%3D%3D On Fri, Jul 2, 2021 at 12:18 PM TJ Trout <t...@voltbb.com> wrote: > Yes you can put an isolated 48v dc to DC supply to isolate -48 from +48 (a > meanwell brand would work) needs to be an isolated converter > > Also fyi that most of the '-48' equipment I've tested hasn't had a chassis > reference to either of the DC input terminals, so thus far I've ran as +48 > on everything. > > 48v is 48v, difference between -48 and +48 being which output terminal may > be bounded to chassis ground. > > On Fri, Jul 2, 2021, 9:33 AM castarritt <castarr...@gmail.com> wrote: > >> Tushar wants me to figure out a good solution for our first site to be >> converted to DC power. >> >> APs I want to power through a rack injector are: >> 3x 450M 5Ghz >> 2x 450i 5Ghz >> 3x 450 5Ghz >> 5x ePMP force200 for ptp customers >> >> The force200s don't use sync, but I would like all the others to have >> sync over power. >> >> Currently we have an ICT-IP-BMMD -48v shelf and one of their isolated 48v >> to 24v converters. >> >> Router is an MT CCR converted to -48v with their DC power supplies. >> Switch is a CRS that will be wired to run off the ICT +24v converter. We >> also have 6x dwave backhauls that will all be fine with -48v. >> >> Problem is, without a +48v source, I can't figure out a way to power all >> 13 radios through a single rack injector without giving up sync via power >> on the 450i APs. Is there an easy way to get +48v off of either the -48v >> or +24v ICT supplies, or should I just plan on adding a second rack >> injector? >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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