Hubs make more ethernet ports by basically repeating network traffic. Actually, a hub kind of works like a splitter sounds like it should work. You connect a router to a hub in another room with a single cable. Thats good because it extends the network, creating more connection points.

Similarly, how do I connect two devices to one Ethernet port? How to Connect Multiple Devices to One Ethernet Port

Connect one end of an Ethernet cable to the Ethernet port on the computer or Ethernet device. Connect the other end of the Ethernet cable to the uplink port on the Ethernet switch. Connect the remaining Ethernet devices to the remaining ports on the switch with Ethernet cables.

Also question is, does an Ethernet splitter reduce speed?

The simple answer would be as long as youre using an Ethernet switch it will not slow down the connection in all likelihood. If the Ethernet switch youre using has gigabit ports then your transfer speed on the switch will greatly surpass that of your internet download speeds.

What are Ethernet splitters used for?

An ethernet splitter is intended to reduce how much cat 5 cable you need when connecting two networks. A network here does not mean the internet, it means either two computers or two LANs. Splitters must be used in pairs.