RJ45 Ethernet Splitter Connectors 1 to 2 Splitter Connectors Adapter LAN Ethernet Plug Connector Compatible with Cat5 Cat6 Cable, Two Computer Can Surf the Internet at the Same Time (White,2 Pieces) :
Ethernet Hack. How to split one ethernet cable for a few devices. One ethernet jack for two PC - YouTube
Amazon.com: SinLoon (A-Pair) RJ45 Splitter Adapter, Ethernet Cable Splitter, RJ45 Network Extension Connector Ethernet Cable Sharing Kit for Router TV Box Camera PC Lapop (Black) : Electronics
cat5 - How to get two separated connections on one cable? - Super User
RJ45 Pinout | ShowMeCables.com
Was told it's not possible to have multiple Ethernet/Coax connections by the technician. Am skeptical as home was built in the last 10 years, has ethernet and coax ports in every room,