Amazon.com: 2× RJ45 Coupler with Extra Shielding– Network Cable Connector & Ethernet Cable Extender (Two RJ45 Jacks, Easy Way to Connect/Extend Ethernet Cables, CAT 6A for up to 10Gbit/s, Black) – by
RJ45 Male to Screw Terminal Adaptor RJ45 to 485 2 Pin (4 5P) Splitter CCTV DVR | eBay
Amazon.com: TNP RJ45 Ethernet Cable Combiner/Splitter Kit (1 Pair), 2 Male to 1 Female & 1 Male 1 Female to 1 Female POE Data Adapter LAN Ethernet Network Extender Y Splitter Cat5e