[Tfug] Yet another poser

[johngalt1]

----- Original Message ----- 
From: "George Cohn" <>
To: "Tucson Free Unix Group" <>
Sent: Monday, September 17, 2007 2:57 PM
Subject: Re: [Tfug] Yet another poser


> jblais wrote:
>>
>> What about the devices that get their power over the wire 
>> (something I
>> recall or dreamt, for industrial stuff) in which case the 
>> signal wires would
>> be swapped but not the power.  I don't know iif these 
>> devices use the cat5
>> wire or some other stuff.
>>
>
> Are you talking about POE (Power over Ethernet)?  This is 
> a standard,
> IEEE 802.3af, that specifies how switches and patch panels 
> can provide
> power to end devices such a WAP's, VOIP phones, network 
> cameras, etc.
>
> Usually they use two pairs of the 4 pair cat 5e or 6 cable 
> to provide
> the power to the end devices.


Just how does this apply in the context of a crossover cable 
or DC-level "widget"?