I put blue together, white together, and use the shield for ground.
Mike, OK, but then what's the point of four wires if you are only going to use two?? What am I missing here? And with the standard three wire setup is the shielding hooked to the ground wire??
I think the reasoning for using the four wires grouped into two pairs, is that the way the pairs of wires are twisted together internally, it helps to cancel out transient noises that get past the shielding.
Edit to add: I do a lot of industrial control wiring at my work. Groups of twisted pairs are often used to minimize the "bleeding" or crosstalk of signal from conductor to conductor when wires are run parrallel to each other. It is also pretty common that the twist rate per inch is different on each pair within a cable.
Not sure how this translates over to our use of these cables?