[VoIP] PC powersupply -48vdc suggestion

[Steph Kerman]

True.  That's why there are PC power supplies with an integrated UPS 
function that maintain a 12V battery of their own and derive the PC 
power directly from that without up-converting.  The only drawback I can 
think of is that it would not keep a monitor running as might be 
required in some situations, but not this one.

Steph

Shane Young wrote:
> It seems like running a 12v device directly from a 12v supply would be more effecient than converting DC to AC back to DC during a power failure :)
>
> Quoting Richard Walsh <wepbx at sbcglobal.net>:
>> I was looking to replace the power supply in my * PC with a substitute unit with a -48vdc input. I have an existing -48v plant for the PBX equipment.  This would eliminate the need for a separate UPS.
>>
>>   I see many available power supplies from a google search, but does  anyone that has been down this path know of a brand that has been reliable and affordable?  I am more comfortable getting a unit that   
>> others have utilized.
>>
>>   I was also hoping to take +12v out of the PC to power my DSL modem and my router/switch, both which presently have AC wallwarts with 12vdc outputs. I presume this is OK. The only hazard (perhaps a big one) is that the 12v rail is now powering a device that has some exposure to the DSL/POTS line (copper out to the street and beyond).
>>
>>   Rick Walsh
>