Diagnostics; Help - TP-Link TD-8816 User Manual

4.6.5 Diagnostics

Choose "Maintenance→Diagnostics", you can view the test results for the connectivity of the
physical layer and protocol layer for both LAN and WAN sides in the screen (shown in Figure 4-52).

4.7 Help

Choose "Help", you can view the help information for configuration of any function.
TD-8816 ADSL2+ Modem Router User Guide
Figure 4-51
Figure 4-52
56