[Asterisk-Users] Power Over Ethernet for *any* ethernet switch (or hub); product idea

[Steven Critchfield]

On Tue, 2004-01-20 at 08:02, Matteo Brancaleoni wrote:
> Hi.
> 
> > The POEI simply connects the four ethernet signals on each of its "inputs" 
> > (pins 1,2,3,6 on each) to the same pins on its corresponding "outputs". 
> > Additionally, it supplies -48VDC (maybe selectable if there are other 
> > voltage needs) on the appropriate pins (also maybe selectable if different 
> > vendors use different wiring conventions for POE) of its "outputs".
> 
> and probably you're going to fry something on your lan.
> POE isn't simple power on the right pins, but is
> a sort of "protocol". Really, on POE enabled devices
> (or injectors) you won't measure the DC with a tester,
> simply because POE on port X is enabled after a request
> by the device on that port. this is for mantaining compatibity
> with non POE devices.
> so you will need also something that detects the power request
> on each port and enables it.

How does a non powered device request power?
-- 
Steven Critchfield  <critch at basesys.com>