a picture showing the wiring on this McManstel box. Interesting thing to note is that McManstel box does not even take a power supply so it cannot be running its own processor or OS. http://www.grmtech.com/blog/wp-content/uploads/2009/02/black-wire-input-and-two-eth-yellow-wire-output-300x225.jpg These two yellow wires go to the CISCO Catalyst 2950 switch. Here is a picture showing the input to the CISCO switch: http://www.grmtech.com/blog/wp-content/uploads/2009/02/input-to-the-cisco-switch-300x128.jpg