D-Link DSL-2640B - Manual (Page 84)

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ADSL BER Test
A Bit Error Rate Test (BER Test) is a test that reflects the ratio of error bits to the
total number transmitted.
If you click on the ADSL BER Test button at the bottom of the ADSL Statistics page,
the following pop-up screen will appear allowing you to set the tested time and to
begin the test.
When you start the ADSL BER Test, the following progress window will display the
connection speed as well as the length of time that the test will run for. At any
time during the test, click on the Stop button to terminate the test.