Connect the single side of the splitter to the "Out" port on the cable box. The out ports are the split signals. In this guide, we'll explain how to safely connect a splitter to another splitter, covering both fiber optic and coaxial setups. What Is a Splitter and Why Cascade Them? A splitter divides a single input signal into. In this video, I show you how to install a coaxial cable splitter easily. Indoor options encompass locations like the community's central computer room, building's weak current well, or floor wiring box. A cable splitter is a useful device that allows you to connect one source of cable signal to multiple devices.