[PLUG-TALK] local testing lab?

[Galen Seitz]

On 05/03/12 18:24, Russell Johnson wrote:
> 
> On May 3, 2012, at 1:28 PM, Bill Ensley wrote:
> 
>> I did thought just check our IP phones and they do have a 48VDC
>> input, that's quite a bit more than I would have expected.
> 
> 48VDC is exactly what a POTS telephone would have on the line. Not
> sure why an IP phone would need that much...

As Russell mentioned, Power over Ethernet(PoE) is typically at ~48V.
Presumably the reason for the higher voltage is to reduce resistive
losses in the cabling.

galen
-- 
Galen Seitz
galens at seitzassoc.com