Probably not. The USB is the programming interface. It's technically a serial port so it can be used to tx/rx anything you want really.

Looks like they use RJ11. I'm going to start using cat5 for most of my interfacing, assuming it doesn't need to carry much current. Right now I'm working on a super simple/cheap PWM controller for LEDs and an additional module to drive/dim LEDs directly from a DC power supply.