Join two or more of our Premium Shielded Ethernet Cables together with this coupler. It is very simple - it has an RJ45 (standard Ethernet jack) on each side. It is a straight-through coupler. If you need to temporarily or permanently add length to a run, you can use this to join two or more cables together. The maximum run for Ethernet is typically 100 meters (328 feet). So don't worry about degrading your signal for short runs - this coupler can handle 10 gigabit Ethernet 10/100/1000/10000 even.