Yes, you can repurpose the existing coaxial and telephone wiring in your walls for other purposes. Here are a few options:
Ethernet over Coaxial (MoCA): You can use MoCA adapters to convert your coaxial wiring into an Ethernet network. MoCA adapters allow you to utilize the coaxial cables for high-speed internet connectivity in different rooms. Simply connect one MoCA adapter to your router and another adapter to the desired room, and you can have an Ethernet connection without the need for additional wiring.
Powerline Networking: Powerline adapters enable you to transmit network data over your existing electrical wiring. By connecting a powerline adapter to your router and plugging another adapter into an electrical outlet in another room, you can extend your network connection through the power lines. This method allows you to repurpose the existing telephone or coaxial wiring for network connectivity.
Telephone to Ethernet Conversion: If you have telephone wiring in place, you can convert it into Ethernet for networking purposes. You'll need to rewire the existing telephone jacks with Ethernet cables, and then connect those cables to a network switch or router to create a wired network connection.
It's important to note that the effectiveness of repurposing your existing wiring may depend on the quality and condition of the wiring, as well as the distance and potential interference between the endpoints. Before making any changes, it's recommended to research the specific products and technologies mentioned above, assess your wiring infrastructure, and consider consulting with a professional if necessary.