One of the 4 or 5 datacenters in downtown Tampa had a telco or offshoot in their spaces, when I took All The Tours about 9 years ago.
They have 8x750MCM hauling -48VDC from their power plant to the cage in question. On each side. 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. Cheers, -- jra ----- Original Message ----- > From: "Lady Benjamin Cannon of Glencoe, ASCE" <l...@6by7.net> > To: "Mark Tinka" <mark@tinka.africa> > Cc: "NANOG Operators' Group" <nanog@nanog.org> > Sent: Thursday, October 21, 2021 4:50:10 PM > Subject: Re: Network visibility > Outside the datacenter is where DC power really shines in my opinion. Inside > the DC, everything is AC now and probably for the best. > > We never came up with a modular standard for -48VDC. Perhaps that could have > changed things. > > But it sure is nice having 72hrs of battery run time in the field/edge - > although those are becoming mini data centers themselves and are in turn also > slowly going AC. > > Ms. Lady Benjamin PD Cannon of Glencoe, ASCE > 6x7 Networks & 6x7 Telecom, LLC > CEO > l...@6by7.net > "The only fully end-to-end encrypted global telecommunications company in the > world.” > > FCC License KJ6FJJ > > Sent from my iPhone via RFC1149. > >> On Oct 20, 2021, at 10:19 PM, Mark Tinka <mark@tinka.africa> wrote: >> >> >> >>> On 10/20/21 20:37, Lady Benjamin Cannon of Glencoe, ASCE wrote: >>> >>> -48VDC power is still the best. >> >> I really envy folk that love DC for networking gear :-). >> >> Work in 2007 was an all-DC network. I rebuilt it into AC, considering the ISP >> also owned the data centre (most of whose customers bought AC). The space we >> freed up and the ease of deployment was night & day. >> >> Currently, we obviously need DC for the terrestrial Transport and wet plants >> (because that's just how classic telco rolls), but I also switched all >> IP/MPLS >> gear to AC soon as I arrived. Heck, even the Arbor (now Netscout) gear, as >> well >> as the HP server rack, was loaded with DC power supplies. Those things just >> had >> to go. >> >> There is an avenue of pleasure in not having to spend inordinate amounts of >> time >> adding major electrical planning to deploying/decommissioning a router, >> switch >> or server. >> >> But yeah, I know the AC vs. DC discussion can become a rat hole. >> >> I'm aware of data centre operators now providing DC as an option for their >> expansion projects, when they previously had it as the norm, FWIW. >> > > Mark. -- Jay R. Ashworth Baylink j...@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274
