Lanberg's LAN / RJ-45 splitter is a solution that allows you to separate a single network cable into two devices. For this device to work properly you have to have 2 splitters. First connect 1st adapter to 2 devices (e.g. 2 PCs). Next please connect the outgoing cable from the first adapter to the 2nd one. Another 2 devices you have to connect to the second adapter.