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990DSL
Users Guide
•
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.
ATU-R Test
To test for the presence of a customer's ADSL modem, do the following:
1.
Connect the tester pair 1 leads to the modem "Line" jack, or to the
outside line, with the DSLAM disconnected.
2.
Press B (ATU-R Test), then press K.
ATU-R Test Results
At the completion of the ATU-R test, one of three screens similar to the
ATU-C screens (listed above) is displayed. The "ADSL Modem Detected"
screen gives the signal loss at the modem training frequency but does not give
predicted data rates as in the ATU-C test.
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