On Aug 28, 2004, at 1:13 PM, 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?
Mike
I'm using one of these:
http://www.linksys.com/products/product.asp?grid=36&scid=47&prid=582 (under $40)
This is a "dumb" device that's always powering the ethernet line, but it works. The only catch with 7940 and 7960 phones is that they expect the polarity to be reversed, compared to the rest of the world's POE specs.
So, you either have to make a funky ethernet cable (detailed in the Wiki) or cut the cable from the included 48V power supply and reconnect it backwards.
Works wonderfully.
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