That's not an ethernet port, it's a telephone socket, but that is ethernet cable.

Usually the blue pair is used for telephone.

That port is a phone port, not an Ethernet port (though Ethernet cable is often used for phone signals). Do you know what's connected to the other end of that cable?

CYaBro:

That's not an ethernet port, it's a telephone socket, but that is ethernet cable.

Usually the blue pair is used for telephone.

little bit more to it than that

Hi, possibly, but it depends how the house wiring has been run. As its setup for phone its quite possible its run in daisy chain, which means you will need to connect all segments somehow.

What other phone outlets are in the house. At this point one would reach for a cable toner and work out where each run goes to and make a plan.

Cyril

those wires have been butchered and will need to be cut back a bit not giving you much to work with.