They have these special clips that make it super easy to switch the direction of your fiber optic cables. So, if you need your cables to go straight or cross-wired, you just take off the fiber connectors, switch them around, and put them back on. Subscribe to the Vericom YouTube Channel - https://bit. ly/4ccUwLaOur Fiber Duplex Patch Cables, made with. You can change a duplex LC fiber patch cable's polarity within 30 seconds when you learn how in this video! You'll find that it is a piece of cake, and you might make it in a shorter time after practice. A link's transmit signal (Tx) must match its corresponding receiver (Rx) at the other end.