The FreePBX System Status page is the first page you land on when you login to the web interface.
This module shows you important Notices found by the system (such as FreePBX updates and other issues that may affect the operation of your system), various Statistics relating to the operation of your system, and the status of various components needed for your system to run properly.
Most of these components are self-explanatory.
However, you should note that the transmit and receive statistics (under "Network" in the "System Statistics" box) are reported in Kilobytes, and must be multiplied by 8 in order to get the bandwidth in kilobits.