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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