Matt,
It is 24V DC. I cannot see it causing too many problems for the data. Anyhow, isnt that the beauty of TCPIP, if messages get corrupted they are noted and retransmitted. It is such a wonderful, fast communication method, but we would prefer not to have to run seperate cables for power. It is a process control, factory application.
Has no adventurous soul tried this, or got a clever solution. I would even consider 2 connections at the end of the cables, one the ehternet RJ45, the second for 24V annd GND.
Michael.