Hey mate did you get this working? Inline with what InsaneAsylum was saying - Jack 1 is a mirror of the wires needed for 100BASE-TX, whereas Jack 2 isnt. You possibly might have a fault in your run from your patch panel to your wall plate eg wires 4/5 or 7/8 (might just need re kroning at the wall plate or patch panel?). This would explain why your network would work on Jack 1 but not 2 and also would work when you just normalise it and plug 1 PC into the port and switch (1 to 1) You would be able to test this by plugging this into another port on the patch panel that is going to a seperate wall plate. HTH