Method and system for improved single-ended loop make-up identification
First Claim
1. A method for identifying the makeup of a subscriber loop including a cable having one or more discontinuities thereon wherein said subscriber loop is a loop in a loop plant, said method comprising the steps of:
- transmitting a probing pulse on the loop and acquiring data based on receiving echoes caused by the discontinuities on the loop;
hypothesizing a representative set of topologies of the loop based on the acquired data resulting from the discontinuities;
computing a corresponding waveform for each of the hypothesized discontinuities; and
, comparing each computed waveform to the acquired data and choosing the topology whose corresponding waveform best matches the acquired data using a multiple path search.
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Accused Products
Abstract
In a method and system for determining the composition of a subscriber loop, the method consists of analyzing the echo responses generated by the transmittal of pulses onto the subscriber loop. In the method, discontinuities along a loop are identified sequentially by comparing the measured waveform to waveforms generated on the basis of a hypothesized topology. The best match for the waveform is identified using a maximum likelihood approach and a maximum a-posteriori probability (MAP) estimator using observed knowledge regarding the loop plant. A multiple path search is also utilized to improve results and reduce computation time. Once the generated waveform that best matched the measured data had been found and a discontinuity identified, the waveform generated is subtracted from the measured data to produce a compensated waveform, which is used to detect the location and cause of the next echo. A calibration method is implemented to further improve data acquisition.
12 Citations
10 Claims
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1. A method for identifying the makeup of a subscriber loop including a cable having one or more discontinuities thereon wherein said subscriber loop is a loop in a loop plant, said method comprising the steps of:
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transmitting a probing pulse on the loop and acquiring data based on receiving echoes caused by the discontinuities on the loop;
hypothesizing a representative set of topologies of the loop based on the acquired data resulting from the discontinuities;
computing a corresponding waveform for each of the hypothesized discontinuities; and
,comparing each computed waveform to the acquired data and choosing the topology whose corresponding waveform best matches the acquired data using a multiple path search. - View Dependent Claims (2, 3, 4, 5)
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6. A system for identifying the makeup of a subscriber loop including a cable having one or more discontinuities thereon wherein said subscriber loop is a loop in a loop plant, said method comprising:
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a probe for transmitting a pulse on the subscriber loop and for acquiring data based on received echoes caused by the discontinuities on the loop;
a means for hypothesizing a representative set of topologies of the loop based on the acquired data resulting from the discontinuities;
a means for computing a corresponding waveform for each of the hypothesized discontinuities; and
,a means for comparing each computed waveform to the acquired data and choosing the topology whose corresponding waveform best matches the acquired data using a multiple path search. - View Dependent Claims (7, 8, 9, 10)
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Specification