Convert Rj11 to Rj45 Wiring Diagram | Free Wiring Diagram Collection of convert rj11 to rj45 wiring diagram. A wiring diagram is a streamlined traditional pictorial depiction of an electric circuit. It reveals the parts of the circuit as simplified shapes, and the power as well as signal connections in between the devices. Draw your wiring : RJ11 Phone to RJ45 Jack Cat5, Cat5e, Cat6 cable is frequently used for wiring telephone jacks. You can send up to 4 telephone lines on one 4 pair cable that terminates at a RJ45 (8P8C) jack. The problem is most phones, even multi-line phones, dont directly plug into an RJ45 jack. Well discuss some options for connecting phones with RJ11 connectors to an RJ45 port.