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Starting a DSL ATM BERT
Note
Showtime must be displayed to indicate that the DSL is
active and a connection to a modem has been established.
-1- From the Select Operation screen select ATM Layer
-2- Press F1 Start to begin the BERT.
Making sure that the patterns are synchronised
For the BERT to be reliable, the pattern
receives back across the line must be synchronised with the
pattern it is transmitting, so that they can be compared.
To check that this is the case, look at the BERT Sync LED.
Steady green means that the patterns are synchronised. If
they are out of synchronisation, check that the remote end
is looping back and sending the same pattern as your
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Making sure that the test is working properly
At the start of the test, you can inject a single bit error into
the data stream and check that it is detected. To do this:
-1- Press F4 Error.
-2- Make sure that the error has been detected and is
-3- Press F2 Reset to reset the counters to zero and begin
Issue 7 - 05/02
and press ENTER to display the DSL ATM BERT
Test screen.
When the BERT has finished the following screen is
displayed.
.
displayed.
Press F3 Clear to reset the BERT LED.
the 'real' test.
Section 5 - ATM Layer Tests
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4-65
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