I have an RJ11 connector on my PCB. I'm considering using a telephone cord, but I'm worried about interference. I will have 8 cables in one bundle and I'm afraid they won't interfere with each other. I want to use it on DS18B20 (maximum 6 meters) and for I2C maximum 3 meters outdoors. Everything for the weather station.
I would also like to use a CAT5 LAN cable, but even if I use only 4 cores, it plugs quite badly into the RJ11 connector. I am therefore considering the simplicity of using a cable cable, which should go into RJ11 better.