Hey, this isn't an ardiuno question per se but I recently bought a mindstorm and it uses these telephone wires to interface from the microprocessor with the peripheral devices. It's a neat/clean way to connect.
I was wondering what type of interface that is. Is it using I2C or just regular digital/analog like on the ardiuno?
I found the answer via wikipedia Lego Mindstorms NXT - Wikipedia
Connector
Sensors are connected to the NXT brick using a 6-position modular connector that features both analog and digital interfaces. The analog interface is backward-compatible (using an adapter) with the older Robotics Invention System. The digital interface is capable of both I2C and RS-485 communication.