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

[Clif Jones]

Follow this link for some more info.  Maxim IC just released a couple of 
chips that handle the
details of 802.3af for you.
http://www.maxim-ic.com/view_press_release.cfm/release_id/925


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.
>
>Matteo.
>
>  
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