Mailinglist Archive: opensuse (2496 mails)

[Hans Witvliet <hwit@xxxxxxxxxxx>]

On Tue, 2008-12-02 at 11:43 +0100, Carlos E. R. wrote:
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> On Tuesday, 2008-12-02 at 09:29 +0100, Hans Witvliet wrote:
>
> ...  [dc power]
>
> > When ordering servers from HP, you can specify whether you want AC-power
> > adapters (110 - 230Vac) or 48Vdc-apapters.
> >
> > Only catch is that you have to be carefull that in telco-stuff the plus
> > is grounded, while other equipment (like RF-transmission) use
> > negative-grounding.
> >
> > Unless you are fond of sparks and welding, you're in for a nasty
> > surprice..
>
>     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 :-}
>
>
> 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.

Hi,

At my previous job, one of my friends dropped a screwdriver on those
copper bars. Slight hickup, but after a moment the screwdriver was
melted...

AFAIR, both versions oft the psu were expensive, well, you you what the
abbreviation HP means: High Priced ;-)

Not sure about the grounding, execpt that they sell dedicated
Microsoft-versions, that have both types of grounding combined...

At my current positions they use inverters for each 19" cabinet and a
couple of their own generators
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