A splitter needs to be added if there is a port

You cannot use a simple Ethernet splitter to connect multiple devices to the same port simultaneously at full speed; a network switch is required for simultaneous connections.Ethernet SplittersAn Ethernet splitter is a passive device that allows two 10/100 Mbps connections to share a single cable by using the unused wire pairs inside a standard Cat5/Cat5e/Cat6 cable . It requires two splitters: one at the network source (router or switch) to combine signals, and one at the device end to separate them . Each connection still needs its own port on the router or switch, and splitters cannot provide gigabit speeds because gigabit Ethernet uses all four wire pairs . Splitters are best for low-traffic setups where devices do not need high-speed simultaneous access.Network SwitchesTo connect multiple devices to a single Ethernet port and allow them to operate simultaneously, a network switch is the proper solution . A switch actively manages data traffic, directing packets to the correct device, and can provide full-speed connections to multiple devices using one uplink port. Even a small 4- or 5-port gigabit switch can expand a single wall port to multiple devices without reducing speed . Switches are more versatile than splitters and are suitable for home offices, gaming setups, or small business networks.Practical RecommendationFor simultaneous connections at full speed: Use a network switch. Connect the switch to the single Ethernet port, then plug your devices into the switch .For low-speed, occasional connections: A passive Ethernet splitter can work, but each device will share bandwidth and be limited to 100 Mbps .Avoid using splitters for gigabit networks or high-traffic applications, as this will cause performance issues . In summary, while splitters can physically share a cable, a switch is required to allow multiple devices to use the same port at the same time efficiently.