This RJ45 3 Way Network Cable Splitter Plug can convert and increase your Ethernet connections from 1 to 2 sockets, then we can share the high speed DSL, cable modem and Ethernet ports with your family or your friends. It convert a single RJ45 outlet to two RJ45 sockets easily and the two RJ45 sockets work without conflict with each other. Some switches only allow one MAC address for one port then the Splitter can not work, but this kind of switches are very rare in the market. Do make sure that your switch can allow more than one MAC address for one port. On the other hand, if you find your network cable is not long enough and you don't want abandon the old cable, this Cable Splitter can do you a favour. Just buy a new cable and input one end of the cable into the Splitter and the other end into your PC or laptop. Then everything works fine, but the total cable length should be shorter than 100m.