[54408] in North American Network Operators' Group
Re: DC power versus AC power
daemon@ATHENA.MIT.EDU (David Lesher)
Sun Dec 29 21:34:04 2002
From: David Lesher <wb8foz@nrk.com>
To: nanog@merit.edu (nanog list)
Date: Sun, 29 Dec 2002 21:19:57 -0500 (EST)
In-Reply-To: <20021230014517.GA797@pit.databus.com> from "Barney Wolff" at Dec 29, 2002 08:45:17 PM
Reply-To: wb8foz@nrk.com
Errors-To: owner-nanog-outgoing@merit.edu
Unnamed Administration sources reported that Barney Wolff said:
>
>
> > I'm surprised you're still around after a sub battery accident.
> > They're a grade up from most CO's in available current, I'd bet.
>
> I'd bet the other way. CO battery has to supply ring current, dial
> tone and voice current, not just run the switch itself, at least
> in the Copper Age. I don't think -48VDC is an electrocution risk
> unless you're sweaty, but a vaporized wrench sure can burn you, and
> I don't think GFIs existed for DC.
>
> Anyway, nukes don't need the battery capacity of the old diesels.
<http://www.relocationspecialists.org/bat/cell.html> and
<www.jjma.com/Documents/Features/batteryd.pdf>
--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
