A little hack to power a phone via one switch, while getting IP connectivity via another. This has limited practical application, but in my case I needed to connect a phone to a unique VLAN on a non-PoE switch. Plus, I just wanted to see if it would work.
To do this, you will need to craft a special patch chord. Basically, you will join two patch chords (with one end as a normal EIA-568B Straight-Through), and the other ends joined into a special connection (see diagram).
To use this cable, patch it in as follows. The "special" end goes into the PoE device, in this case a 7960 IP Phone. The Ethernet end goes to a standard switchport. The PoE end goes into a PoE switch port. This should only work on a 10/100 port, because 1Gig ports utilize a different set of pin-outs for data and power. I haven't tested this with a 1Gig port yet, so I'm not certain if it would negotiate down to 100BaseTX.
On the non-PoE:
SIP00036BC17FA1 Fas 0/23 137 H Cisco IP PPort 1
On the PoE switch:
Interface Fa0/1: Power given, but link is not up
