Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 112)

ADSL2/2+ Router
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4.4 Diagnostics
Through the Diagnostics function, you can check connection status of
the router’s interfaces. When a connection is successfully established,
its status displays a “PASS”, otherwise it displays a “FAIL” click ". To
enter the page below, click the “Diagnostics” tab on the left navigation
menu column:
If you are not clear about the test result, please click “Help” for more
details.