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[quote user="gregc"] doesn't the cab bus require only 4 conductors? the outside 2 conductors are for providing track power <div style="clear:both;"> </div> [/quote] The outside wires are used only for the Power Cab.  The 5amp system only uses the middle 4 wires.  The outside two are "reserved for future use".  You only need 6wires between the Power Cab and its PCP.  Any other cab (Pro, 04,05,06) only has a 6p4c plug on it. You can make your own cables with 6p6c (RJ12 modular plugs) and a roll of Cat5e.  The crimper can be found for less than $30.  BNM hobbies sells a tester that works pretty well, just dont use it with 12vdc plugged into the back of the UTP [:$] You can also use two wall plates as a cable tester.  Plug cable into both wall plates, check continuity with a multivolt meter pole between each screw on the back on of one plate (this should be an open circuit), and between each wall plate (should be a complete circuit).  When you hold the two plugs together, with the locking tabs up, you should have the same color pattern left to right in each plug.  It does take practice to get the connectors right.
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