Cisco came up with PoE before the standard was set and so it differs.
The polarity is switched, so using a dumb power injector and a "crossed" cable
one could make it work anyway.

Quoting Julio Arruda <[EMAIL PROTECTED]>:

> Keith Burns wrote:
> > I think you need to look at a few other factors.
> ...
> > 2. Line power - Cisco uses one standard, other phones use another... but
> > Cisco is the 900# gorilla in the powered switch market... your call...
>
> I'm curious about this point..
> Most if not all vendors that support PoE are not already support 802.3af
> standard ?
> ...
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