XDSL Testing and Loop Qualification
ADSL Verify Test
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ATU-C Test Results
At the completion of the ATU-C DSLAM test, one of three basic screens is
displayed:
• Data Activity Detected
This result indicates that the modem is still connected to the line, and
needs to be disconnected; or that the modem has just been disconnected,
and you should wait about a minute before repeating the test.
• DSLAM Detected
After successful training with the DSLAM, the tester displays predicted
Downstream and Upstream bit-rate ranges and the measured signal loss at
the training frequency.
Downstream Bit-rate Ranges:
HIGH = 4 to 8 Mb/s
MED = 2 to 4 Mb/s
LOW = 1 to 2 Mb/s
Upstream Bit-rate Ranges:
HIGH = 0.5 to 1 Mb/s
LOW = 0.1 to 0.5 Mb/s
• DSLAM Not Detected
This indicates that the DSLAM has not yet been connected at the frame,
the DSLAM modem is not operational, or the outside line will not support
ADSL operation. This could be due to the presence of one or more load
coils; excessive loop length, bridged tap length or background noise; poor
splice joint; resistance fault; or interference from adjacent digital circuits
or AM radio signals.
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