[Asterisk-Users] POE

[Greg Boehnlein]

On Sat, 28 Aug 2004, Michael Welter wrote:

> Since the Cisco 79XX phones preceded the PoE standard, they are 
> different--polarity is reversed.
> 
> IANAE, but as I understand the PoE devices, there are two types--one 
> always applies -48VDC to the brown pair while the other senses (as per 
> the PoE spec.) whether the device at the other end requires power.
> 
> I'm not willing to risk a $300 Cisco set, so I'm still using the wall 
> wart.  Is anyone providing LAN power to 79XX phones at a reasonable cost?

Please see:

http://www.voip-info.org/wiki-Cisco+POE

I am using 3Com POE injectors (the Dumb kind) with Cisco 7960s without a 
problem. You need a special cable that you can build or, you can buy a 
PowerDSine POE injector and get the following (part PD-PS-401-5/CSCS) 
which will do the same thing as the cable.

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