See picture below. top to bottom:
1. Control Bus Cable with RJ-H / RJ9 connector 4P4C. A 4 wire cable used between boosters and a command station. Maximum length is 300 feet.
2. Cab Bus Cable with RJ12 connector 6P4C. A 4 wire cable used for tethered cabs. Notice the 6 pin connector with only 4 slots being used. This is a regular Cab cable. Can be flat or coiled. Maximum length is 40 feet.
3. Cab Bus Cable with RJ12 connector 6P6C. A flat 6 wire cable used for the cab bus and for the Power Cab. When used with the Power Cab this cable carries full track power AND Cab bus. The Flat 6 wire cable used for the Power Cab is custom made to our specifications and only available thru NCE. Do not attempt to use any other cable. Any 4 or 6 wire cable you purchase from other vendors will not have the same size wires and will void your Power Cab factory warranty. For other applications the maximum length is 40 feet.
To buy a control bus / booster cable contact NCE directly at firstname.lastname@example.org or 585-265-0230 M-F 9a-4p eastern time. Control bus cables are custom made to a specific length. $.50 per ft.+$3+ shipping. Check or Paypal only. No CC.