[TriLUG] Re: voip (POE)

[elfick]

Ron Joffe wrote:

>Just a quick note about POE (power over ethernet). Basically what you see is 
>not what you get :( . I have a Cisco 3524 switch with POE, and I also have an 
>IP phone (Snom 100) which is also POE, but the two don't talk.
>
I've found mention that older Cisco PoE switches reversed the DC voltage 
lines compared to what most other companies were doing as there wasn't a 
standard until recently as I understand it. I'm not sure if this is 
actually what is causing your problem, but it may be worth looking into.
The differences can be found mentioned here:
http://www.nycwireless.net/poe/

And here is a brief talking about Cisco supporting the standard from a 
couple of days ago:
http://www.computerworld.com/networkingtopics/networking/story/0,10801,90260,00.html