Ethernet soldering pcb

For a project I want to directly connect ethernet wires to the pcb of my switch by soldering them on. However I have no idea which color should go where. When I connect a multi meter to one pin on the inside of the rj45 jack, multiple of the ‘soldered’ connectors make a beep sound. Is there any documentation/guides about this? I can’t find anything

Some RJ45 connectors has magnetics transformer as Ethernet is a balanced signal. That will cause several pins to indicate signal as the transformer is low resistance.