[Asterisk-biz] PoE for Cisco Phones

[Greg Boehnlein]

On Sun, 6 Feb 2005, Adi Linden wrote:

> > I started out with (and documented) the Cisco POE cable on the Wiki. It
> > should work with any "dumb" POE injector. I.E. something that doesn't care
> > about 802.3af and just injects 48dc down the line no matter what.
> 
> This will work for a one off hobbyist type application.
> 
> > I've since deployed the PowerDsine POE injector with their Cisco adapter
> > cables. It understands both 802.3af as well as the CDP power protocol
> > (with the right adapter cables).
> 
> While this is less expensive then a Cisco powered switch, it is still way
> too expensive if we're talking 4 phones in a building.

Certainly. It's designed for someone who already has a switching 
infrastructure deployed and needs to power a lot of phones. The other 
benefits of a centralized POE system is that it saved on UPS investments.

The problem with Cisco phones is that they do not understand 802.3af, or 
else you could just use inexpensive one-off injectors.

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