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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