To connect a DSL splitter, you need to locate the phone jack that provides your DSL service. For a phone or fax machine, plug it into the output port labeled. When you need to connect multiple wired devices like computers, printers, and IP phones, but only have one Ethernet wall port, using an Ethernet splitter or network switch can expand your connectivity without rewiring. If. Before you grab your electrical tape to twist the wires into a marginal and trouble-prone splice, consider the “proper” way to splice. I recently tried out several from Ideal, and they worked great! The ones I used feature. However, connecting one splitter to another—also known as cascading splitters—can be tricky. If done incorrectly, it may lead to signal degradation, connectivity issues, or even equipment damage.