The Diagnostics page of the root menu shows the results of a complex test that mainly concerns the ADSL connection. You can rerun this test here, too.
The Management group is about the router itself.
The Settings subgroup allows to save all of the router’s settings into a file, restore them from such a file, or reset them to their factory defaults.
On the System Log page you can view the router’s log and specify its parameters.
On the Internet Time page the router’s system time is specified.
The Access Control subgroup is responsible for ensuring router access security and includes such parameters as access password, IP-addresses from which the router can be accessed, etc.
The router’s firmware can be updated on the Update Software page.
The Save/Reboot page offers a button to save all the changes and reboot the device.