ok, the first thing I would do to the hub it take some Isopropyl Alcohol and an old tooth brush and clean off the flux. Then if it were me, knowing that the USB Dongle works is as follows
1. Re-Flash teh USB Dongle for pixelnet.
2. Take an ethernet cable and cut one end of it to expose the orange-white and orange wire these 2 are used to send the signel hook then directly to the SSC.
3. Using 2 20 guage wires hook the +12 volts to the positive of the SSC and ground to the negative of the SSC. if you search google for pc power supply connector you will find which pins are +12 and Ground. You will also have to use a jumper wire between two of the pins.
This way you can TEST (NOT FOR GENERAL USE) using the USB Dongle, a 12 power supply such as a PC Power supply, and the SSC.
This will verify that your SSC is working.
Be sure to hoolk up some lights to the SSC.
I'm not sure but you may be able to flash the SSC with the TEST firmware and only supply the 12 volts and then maybe the test pattern will run. I'm not sure on this part.