An ethernet cable contains 4 pairs coloured e.g. orange / white-orange, green / white-green and so on.
You can choose any combination as long as you use the first pair for L+/L-, the second pair for R+/R-, the third pair for data+/data- and the fourth pair for +supply voltage/-supply voltage. As far as I remember you don´t need to connect ML-sense or you can connect it to +supply voltage (which is done in a junction box automatically).
And keep in mind that you must not run the masterlink signal through any ethernet hub/switch/router!
In the old forum - it´s a pity that all threads are lost - we had detailed discussions on this topic.