Customer Ethernet Cable

You have 2 options to wire the Raspberry PI units.

Option1: 

use seperate Micro USB power Cable and Ethernet Cable. This does require 2x more cables, but allows you to use off the self products.

Option2:

You can make a customer CAT5 ethernet cable that can be used for both Ethernet and Power. 100MB ethernet only uses 4 of the 8 cables in a CAT5/6 cable. So you can use the other 2 or 4 (bundled) cables for the 5v power for the raspberry.