Connect the Incoming Cable: Screw the incoming coaxial cable from the wall into the input port of the cable splitter. This port is usually labeled “IN” or has an arrow pointing towards the splitter. Ensure the connection is snug but not overtightened. A DSL (Digital Subscriber Line) POTS (Plain Old Telephone Service) splitter is a device used to separate the digital signals for high-speed internet and the analog signals for traditional telephone service. This is necessary because DSL uses existing telephone lines to transmit data, and without a. The RJ45 connector consists of several key elements that work together seamlessly to facilitate reliable data transfer.