It's not actually a direct USB cable - it's a TTL (serial adapter) cable. The trick circuit is in the plug at the USB end.
You can obtain a USB TTL cable for ~$20 from outlets such as Mouser or Digi-Key - the model is TTL-232R-5V
According to others who have successfully used this cable, the pinout, starting from the inside of the XIA or AHDI unit, is Black > Yellow > Orange > Red and you leave the rest of the wires loose. (TTL cables have 6 pins)
This matches the photo of the USB-CAB found on Axxess' website.
I'm still waiting for some parts to arrive before I can try th
