Adding a PC to the network in another room
Adding a PC to the network in another room
In theory, you can switch from RJ11 to RJ45 since the older 100 Mbps standard used only four wires. If your internet speed matches that or is slower, it should work as long as your phone wiring includes all four wires. Make sure the single cable connects the rooms using the same wires.
It might not be worth the cost of the tools if you can just use existing phone wiring and install CAT 6/CAT 7 cabling with two RJ45 panels.
In one of my older homes, multiple telephone lines were run through a CAT 4 cable and spliced at each RJ11 port to connect to a central point. I only remember this because I had to join several lines together to make a dial-up modem work in another room. That was UTP, so it would have worked for Ethernet if we had tried.
This is the place where you disassemble the phone jacks and examine the wires to check for available options.
If the cable is extremely old with black, red, yellow, and green wires, chances are very low.
Homes built more than 30 years ago usually use Ethernet cables or Cat3 phone cables.
If you're fortunate and the cable has eight wires, simply replace the wall plates with RJ45 connectors.
For a cable with only four wires, you might still attempt a swap, but performance will be limited to 100mbps.
Be aware that phone wires are often daisy-chained across several rooms—you'll need to remove any other jacks along the way and splice the wires.