Mailinglist Archive: opensuse (2496 mails)

["Carlos E. R." <robin.listas@xxxxxxxxxxxxxx>]

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On Tuesday, 2008-12-02 at 07:31 -0500, James Knott wrote:

> Carlos E. R. wrote:
> >    A coworker once fell down from a... what do you call it, a portable
> >    stairs, when he was connecting power at a exchange, with a screwdriver
> >    on his hands. This fell across the two naked dc lines... after some
> >    sparks an entire island resulted without cellular coverage for some
> >    hours :-}
> Anyone with experience in telecom could probably tell about similar
> situations.

I guess so. They are funny, afterwards, and from outside. Not very funny 
for the chaps that had extra work, or those that payed the anoyed clients :-)

  (and the culprit there is the push for lower costs, implying less
  security: the screwdriver didn't have the metal covered with plastic)

never mind.

Anyway, back to linux and UPS... there is nothing abosolutely safe and 
secure. Even an UPS would need to be doubled.


> > I wonder, those servers you mention, can be adapted to both type of
> > grounding? And how is the price compared to ac power unit, if you
> > remember? Not a figure, just curious to know if they are more
> > expensive or not.
>
> As I mentioned in another note, it's often your choice, though I don't
> know specifically about HP.  Modern power supplies are switchers, which
> convert the incoming power (AC or DC) to high frequency AC, passed
> through a transformer and then rectified, filtered & regulated at the
> desired output voltage(s).

Right.

> Because the supply input and output are
> separated by that transformer, they can be completely isolated and
> grouded as required.  So, on equipment, you'll find +, -  and ground
> terminals, with no connection between ground and either power terminal.

Sounds good :-)

- -- 
Cheers,
       Carlos E. R.

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