PCB design for RJ45 jack
Like the note says, the magnetics are implemented on board. So a simple 8P8C (RJ45) connector should work. Also, you need specific impedance which can be achieved with correctly sized traces and grounding. There are plenty of application notes from different manufacturers how to design an Ethernet interface, and how to calculate trace width and spacing to get a certain impedance. Ethernet uses 100 ohms differential impedance.