System and method for pre-qualification of telephone lines for DSL service using an average loop loss
DCFirst Claim
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1. A method of qualifying a line for high speed data services, comprising:
- a) measuring power dissipated in the line at a plurality of frequencies in a first range below a first frequency;
b) mapping the measured power dissipations to a value representative of the average loss in the line over a second range of frequencies that extends to a second frequency, the second frequency being higher than the first frequency;
c) using the value representative of the average loss to predict the data rate of signals transmitted in the second range; and
d) qualifying the line for high speed data services when the predicted data rate exceeds a predetermined threshold.
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Abstract
A system and method for testing lines in a network. The system and method are described in connection with a system for use with a telephone network to aid a network operator determine whether the any line can support high speed data services. According to the method, a mapping is created between low frequency measurements and average loop loss over a high frequency range. The average loop loss is sued to compute the equivalent working length of a line, which is an industry standard measure of the ability of a line to support high speed data services.
39 Citations
20 Claims
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1. A method of qualifying a line for high speed data services, comprising:
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a) measuring power dissipated in the line at a plurality of frequencies in a first range below a first frequency;
b) mapping the measured power dissipations to a value representative of the average loss in the line over a second range of frequencies that extends to a second frequency, the second frequency being higher than the first frequency;
c) using the value representative of the average loss to predict the data rate of signals transmitted in the second range; and
d) qualifying the line for high speed data services when the predicted data rate exceeds a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
a) making a preliminary assessment of the length of the line;
b) selecting coefficients based on preliminary assessment of the length of the line;
c) using the selected coefficients to map the measured power dissipation to an average line length.
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3. The method of claim 2 wherein making a preliminary assessment of the length of the line comprises assigning the line to one of a plurality of ranges of line length.
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4. The method of claim 1 wherein the step of measuring power dissipated comprises driving the line in common mode and measuring the voltage across the line.
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5. The method of claim 1 wherein measuring power dissipation comprises driving the line through a telephone switch connected to a plurality of subscriber lines in a telephone network.
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6. The method of claim 1 used to qualify a line in a telephone network for DSL service.
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7. The method of claim 6 wherein the DSL service is ADSL.
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8. The method of claim 6 wherein measuring is performed on a measurement unit coupled to a telephone switch in the network.
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9. The method of claim 8 wherein predicting the data rate is performed on a computer in a service center.
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10. The method of claim 6 wherein the qualification of a line running to a subscriber premises is performed prior to the provision of high speed data services to that premises.
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11. A method of qualifying a line under test for high speed data services, comprising:
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a) providing a plurality of model lines representing lines with different attenuation versus frequency characteristics in at least a lower frequency range and higher frequency range;
b) dividing the plurality of lines into a plurality of groups;
c) for each of the groups, developing a mapping between characteristics in the lower frequency and performance across the higher frequency range;
d) taking a plurality of measurements on the line, including measurements of power dissipated in the line under test at a plurality of frequencies in the lower frequency range;
e) using the measured values to select one of the groups and applying the measured power dissipation to the model developed for the selected group to predict performance of the line under test across the higher frequency range. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification