If there s no port you can add a splitter
You don't add any Ethernet ports by using a splitter, you simply share a single cable. A splitter will reduce a Cat 5e throughput from its rated 1000Mb (gigabit) speed to a. This "reduction" is the splitter's insertion loss, and for a typical 2-Way (three port) splitter it's usually a 3. It looks simple enough, just a box or adapter with extra jacks, but its role in your network isn't always clear. Even though they reduce the number of cables used, you still need two Ethernet splitters for this to work.
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