Agilent Technologies AuroraPresto, User Manual

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Section 5 - ATM Layer Tests
Issue 7 - 05/02 4-65
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
and press ENTER to display the
DSL ATM BERT
Test
screen.
-2-
Press F1
Start
to begin the BERT.
When the BERT has finished the following screen is
displayed.
Making sure that the patterns are synchronised
For the BERT to be reliable, the pattern
Aurora Presto
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
Aurora Presto
.
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
displayed.
Press
F3
Clear
to reset the BERT LED.
-3-
Press F2
Reset
to reset the counters to zero and begin
the ‘real’ test.
481801-7.book Page 65 Thursday, May 23, 2002 10:46 AM