[Asterisk-Users] IP Phone with Standard Power Ethernet

[Pavel Jezek]

exactly, only high-end cisco 7970/71 are 802.3af compliant,
other models (7905-7960) using proprietary PoE detection and you will be 
out of luck if you use non-ci$co poe equipment,
as I know, powerdsine midspans (because have cisco detection support) 
can power cisco 7912 directly (without pasive polarity dongle),
7940/60 can be powered only using this dongle and with powerdsine...
you are totaly out of luck with cisco phones and e.g. Planet poe 
midspans (using standard 802.3af detection)
I tried this some months ago, so this is from practice.
PJ




Kevin P. Fleming wrote:
> Tom wrote:
>
>> Cisco supports 802.3af with a special cross-over cable which is easy 
>> and cheap to make.
>
> Nope, Cisco phones do _not_ support 802.3af. With the cross-over cable 
> you can make them work off a 'dumb' power injector, but a true 802.3af 
> injector without Cisco-proprietary support will not supply them power, 
> as they will not negotiate for it since they don't support the same 
> protocol. On top of that, a switch with built-in PoE can choose to 
> supply power on the _data_ wires instead of the spare wires (which is 
> fully supported by the spec), in which case a Cisco phone would have 
> no hope of working.
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