I'm so confused why there is no discussion about RJ45 connector being backwards compatible with RJ11 (the RJ11 connector fits appropriately into the RJ45 socket) and that the G4201TM should have a RJ45 socket (like G4202TCP) instead of RJ11 to be most widely functional/compatible (even though you still can use a RJ11 cable with a RJ45 wall socket to overcome this, but you could use RJ45 cables too)...

(models https://www.gigacopper.net/wp/en/home-networking/ )