The DIC-23112 has the option to connect via an ethernet cable to your router rather than using WiFi.

 Using this feature can provide a faster and more stable connection than connecting with WiFi. 

Firstly you need to identify what type of ethernet cable you have T-568A or T-568B. You can tell this by the wire colours as shown below:

You will need to cut off the RJ-45 plug to reveal the individual cables and connect them to the rear of the DIC-23112 as below:

Example below showing T-568B: