[geeks] Re: geeks digest, Vol 1 #64 - 14 msgs

[Ken Hansen]

48 Volts.

In Phone Company Central Offices they have a large complex of batteries that provide backup power (wet cells, like oddly-shaped aquariums, with an open top typically, filled with *battery acid* and a complex array of metal strips) which operate at 48 Volts. All essential systems in the CO (revenue generating equipment) tends to run on the same 48 Volts, so as to not lose any power in conversion to higher/lower voltages.

Hope that is clear, any further questions, don't be afraid to ask...

Ken

-----Original Message-----
From: Joshua D. Boyd [mailto:jdboyd at cs.millersville.edu]
Sent: Friday, April 20, 2001 3:06 PM
To: 'geeks at sunhelp.org'
Subject: RE: [geeks] Re: geeks digest, Vol 1 #64 - 14 msgs


What's this 48v thing people are talking about?

--
Joshua Boyd

On Fri, 20 Apr 2001, Ken Hansen wrote:

> There are OEM vendors that take Sun boxes and make them 48v rack systems for telco/colo installations. I recall that Sun even had a line of 48v machines aimed at the telco market (re-worked case/PS for a midrange Ultra server, IIRC), but that was about 4 years ago, I think.
> 
> I don't know how popular they were, as everyone had gotten used to working around the 48v issue a long time ago - I think it was mainly for deploying servers/routers/whatever in COs that have no provision for 110v UPS...
> 
> Ken
> 

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