[rescue] 48 VDC v -48 VDC...jeez!
george at webbastard.org
Fri Jul 19 14:23:22 CDT 2002
> Can anyone simply explain why egSun uses -48vdc and if anyone else uses
> Can I assume NOT everyone in telecom uses -48vdc?
> Is most telecom -48vdc ?
AFAIK, all telco-style DC equipment is -48V DC. I have never seen anything
called +48VDC except for UPS Batteries.
> which is f((*&g "supply" and which is "return" ???
> + -
> + -
To my knowledge, -48V dc is all the same. It matters not which way you name
it as long as you hook all the +'s together, and all the -'s together, and
your frame grounds to Ground. A voltage differential is a voltage
differential. These aren't series, they're parallel.
(Some correct me if I'm wrong, but that's how I hooked up DC boxes at
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