Bi-directional cable to feed timecode to or from the DIN port on the UltraSync One to or from any device that uses a BNC port for timecode in or out.TC in/out.Can also be used to take genlock from the UltraSync One to any device that accepts genlock in via BNC. Please note that TCS products cannot accept an external genlock input. Each UltraSync One comes with a TCB-46 and TCB-47 cable.