Function and Usage-The main purpose of this Rj45 Splitter is to combine 2 cables to 1 (8 core network cable embeded in the wall)then split again to 2 lan cables in another room or occasion so that both occasion can share the same network, which reduces the length of network cable originally required and saves the money. Please kindly check SECOND IMAGE to avoid misunderstanding. First, using two RJ45 male cables to connect router and Splitter adapter A(side with port 1 and port 2)). Connection Example One-Step two, link port 3 of the two Ethernet splitter adapters A and B with another network cable (or 8 core cable embedded in the wall). Then connect 2 computers to the port 1 and port 2 on the internet splitter B with 2 more cables. As the connection example one shows, so totally 5 cables are needed.(6 if an 8 core cable is embedded). Similar with the connection example 2 for Poe camera. Durability-This network splitter is made in thickened PCB Board.