Sean Kennedy wrote:> http://www.cdw.com/shop/products/default.aspx?EDC=568864
>
> Can anyone tell me if this switch will be able to supply a Cisco 7940
> phone with power? I've heard of PoE issues with differing switches and
> the like, and I don't know how to check to see if this switch will be
> able to drive the phone in question.
I would suspect it will not. Cisco phones do not implement standard PoE,
they are proprietary.
However, when using a "dumb" PoE power supply (like the 3Com brick), a
simple adapter cable (swapping the pairs for power) works just fine with
Cisco phones. When using a "smart" PoE power supply that expects the
device to negotiate with it, the phone won't negotiate properly and
there's a good chance it won't work.