even every "-48" rectifier I've encountered before wasn't chassis referenced, so we use those for +48 as well.... Just wanted to put that out there that many things don't care. Mikrotik 1072 routers w/ '-48' power supplies their support swore they aren't for +48, but work fine.
On Fri, Jul 2, 2021 at 11:38 AM castarritt <castarr...@gmail.com> wrote: > So RSD-500C-48 then? > > On Fri, Jul 2, 2021 at 1:06 PM Adam Moffett <dmmoff...@gmail.com> wrote: > >> I was gonna say the same thing. RSD also doesn't have a cooling >> fan....one less thing to fail. >> >> In either case get a few #6 bolts (or similar size metric) and you can >> mount them to a 1U blank. >> >> >> On 7/2/2021 1:54 PM, Josh Baird wrote: >> >> Do not use the "SD" series. Look for the RSD series instead. The SD >> series has issues with current inrush. >> >> On Fri, Jul 2, 2021 at 1:52 PM castarritt <castarr...@gmail.com> wrote: >> >>> 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 >>>> >>> -- >>> 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 >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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