FWIW, I’m not a hardware person but a link I posted in another thread - emonTx screw terminal block - might be relevant to the discussion of pullups here. See the post by albundy in DS18B20 Max Distance - Raspberry Pi Forums
Also, I remember seeing somewhere the suggestion that the best way to wire using Cat-5 is to use one pair for earth and data and another pair for earth and power. So earth is on two lines. Not sure how that compares against the strict 3-wire approach suggested above.