Re: [AFMUG] -48v DC power and Packetflux Rack Injector for various Cambium radios

Fri, 02 Jul 2021 15:33:25 -0700

The DDR series (Meanwell DIN mount DC-DC) are also good, like the RSD, but in a DIN mount form factor.


Jesse DuPont

Owner / Network Architect
email: jesse.dup...@celeritycorp.net
Celerity Networks LLC / Celerity Broadband LLC
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On 7/2/21 12:05 PM, Adam Moffett 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?


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?
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