DC Power choices (was Re: Network visibility)

Bryan Fields Bryan at bryanfields.net
Sun Oct 24 03:27:53 UTC 2021

On 10/22/21 1:13 AM, Jay R. Ashworth wrote:
> It was, in fact, pretty impressive to look at.  But I was a little worried about 
> the loading on the building frame.  :-)
> And while I think there might be advantages in running power supplies in gear
> at -48, I'd want to rectify it in the cage, preferably from 480/3ph.

High voltage DC (400v) has all the advantages of DC with none of the lossy
drawbacks of -48v.  What's nice is most every AC PSU now will run off it with
minor modifications, so it's trivial for vendors to support.  Nokia and
Juniper even do it in the same AD/HVDC supply.

I like DC, it's much simpler, but it's a lower volume product.  One advantage
to AC is I can call any electrocution and they can run a cable in a pinch for
me.  DC, even though it's the same physics, is harder to find experienced tech
to work with.

Bryan Fields

727-409-1194 - Voice

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