The RJ45 Ethernet Jack is used for connecting wired devices with a Cat5/6 LAN cable. This is not used for data traffic into Simplifi, rather used for sending data traffic out from Simplifi to another device and/or switch. If you are intending to send data traffic through or into Simplifi, then please search under USB Dongle
Please use caution when inserting and removing a Ethernet plug into the port, it is recommend to use as minimal pressure as possible when inserting the cord and ensure to pull up on the cord tab when removing the cord form the device.