from top to bottom in the following picture
1. Control Bus Cable with RJ-H 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 Powercab. This cable carries full track power AND Cab bus when used with the Powercab. The Flat 6 wire cable used for the Powercab 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. For other applications the maximum length is 40 feet.