This can also be used to power a router, switch, access point or hub that is located in a area that does not have power. For example, you may want to use this method to relocate a WiFi access point to the attic or in a drop ceiling at the office.
The Commercial Linksys POE power injector adapters go for around $40. Power injector adapter
I had the materials on hand which is what prompted me to do this project. You should be able to pick up the materials for under $8...given that you already have a spare Ethernet cable lying around.
2 - RJ45 Ethernet (cat5) wall plate jacks.
1 - RJ45 Ethernet (cat5) patch cable.
Step 1: What Wires Are Actually Used for Data?
Step 2: Striping the Ethernet Cable and Sorting the Wires.
Step 3: Cutting and Striping the AC Adapter Wires.
Step 4: Match the Colors to the Ethernet Jack.
Step 5: Powering the Ethernet Jack
You should now have 2 parts. One will have the AC adapter power block connected. The other will have the AC power plug connected. ( as pictured). Use electrical tape to secure the AC wire to the ethernet cable. This will help to relieve the strain on the AC wires.
Step 6: The End Results
This solution allows you to use any length of Ethernet (cat5) cable between the devices.
*Note -- This method may not work on Gigabyte devices, since all 8 wires are used. This should only be used on 10/100mbps base network devices.