Detection of wiring defects
View Patent ↗A method for detecting a defect in wiring in a DSL system. The method includes collecting data including instantaneous values, a history of values, and/or parameters relating to a central office or customer premises equipment, analyzing a line for a wiring defect based on the collected data, and reporting whether or not a wiring defect was detected responsive to the analyzing step.
1. A digital subscriber line (DSL) wiring defect analyzer, comprising:
a data collection module coupled to a plurality of sources of information in or connected to a DSL system from which to collect data said collected data including data indicating a rapid and abrupt variation in bit distributions across frequency tones in a DSL signal transmitted on a DSL line;
a wiring defect analyzer module coupled to the data collection module to analyze the collected data including:
generating a sum of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line;
generating an average of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line; and
generating a sum of the number of frequency tones in the DSL signal transmitted on the DSL line that experience a minimum variation in bit distribution compared to an adjacent frequency tone;
comparing the sum of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, the average of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, and the sum of the number of frequency tones in the DSL signal transmitted on the DSL line that experience a minimum variation in bit distribution compared to an adjacent frequency tone against a corresponding threshold value to determine whether a wiring defect exists in the DSL system; and
a report generator module coupled to the wiring defect analyzer module to receive a parameter value generated by the wiring defect analyzer module indicating a wiring defect exists when the wiring defect analyzer module detects one or more of the sum of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, the average of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, and the sum of the number of frequency tones in the DSL signal transmitted on the DSL line that experience a minimum variation in bit distribution compared to an adjacent frequency tone differs from the corresponding threshold value and provide the parameter value to a DSL system operator.
2. The DSL wiring defect analyzer of claim 1 , wherein the plurality of sources of information in or connected to a DSL system includes a network management station, a managed entity in an access node, or a management information base (MIB), a broadband network, a database storing binder-level information such as deployment information, topology information, crosstalk coupling, or modem capability information such as procedures for bit loading and power allocation, service priorities, operational data, and parameter history data.
3. The DSL wiring defect analyzer of claim 1 , wherein the DSL wiring defect analyzer module further to analyze the collected data to determine whether line instability exists, and further wherein the DSL wiring defect analyzer module to analyze the collected data analyzes whether any existing line instability is due to an existing wiring defect.
4. The DSL wiring defect analyzer of claim 3 , wherein the DSL wiring defect analyzer module is to obtain and evaluate channel performance monitoring parameters or line performance monitoring parameters, or distributions of the parameters over time, to analyze whether any line instability exists.
5. The DSL wiring defect analyzer of claim 1 , wherein the wiring defect analyzer module further comprises a combiner module that combines the sum of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, the average of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, and the sum of the number of frequency tones in the DSL signal transmitted on the DSL line that experience a minimum variation in bit distribution compared to an adjacent frequency tone and compares them against a threshold according to one of a logical combination, a voting method, a weighted sum, or a geometric sum.
6. A computer-implemented method for a controller to detect a defect in wiring in a Digital Subscriber Line (DSL) system, comprising:
collecting data including instantaneous values, a history of values, and parameters relating to a central office or customer premises equipment, at a data collection module in the controller, said collected data including data indicating a rapid and abrupt variation in bit distributions across frequency tones in a DSL signal transmitted on a DSL line;
analyzing, at a wiring defect analyzer module in the controller, the DSL line for a wiring defect based on the collected data including:
generating a sum of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line;
generating an average of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line; and
generating a sum of the number of frequency tones in the DSL signal transmitted on the DSL line that experience a minimum variation in bit distribution compared to an adjacent frequency tone;
comparing the sum of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, the average of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, and the sum of the number of frequency tones in the DSL signal transmitted on the DSL line that experience a minimum variation in bit distribution compared to an adjacent frequency tone against a corresponding threshold value; and
reporting via a reporter module in the controller a wiring defect was detected responsive to the analyzing step when the analyzing step detects one or more of the sum of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, the average of the variation in bit distributions across frequency tones in the DSL signal transmitted on the DSL line, and the sum of the number of frequency tones in the DSL signal transmitted on the DSL line that experience a minimum variation in bit distribution compared to an adjacent frequency tone differs from the corresponding threshold value.
7. The method of claim 6 , wherein the parameters relating to a central office or customer premises equipment include line inventory parameters, channel test, diagnostic and status parameters, line test, diagnostic and status parameters, line performance monitoring parameters, and line failures.
8. The method of claim 6 , further comprising analyzing the data so collected by computing at the wiring defect analyzer in the controller an additional metric based on the collected data and evaluating the additional metric against a condition.
9. The method of claim 8 wherein the additional metric is a one of a measure of Hlog, a measure of Hlin, a measure of SNR, and a measured noise.
10. The method of claim 8 wherein the analyzing the data comprises analyzing channel performance monitoring parameters and line performance monitoring parameters, or evaluating distributions of these parameters over time, including:
CV, code violations;
FEC, number of corrected codewords;
FECS, FEC seconds;
ES, errored seconds;
SES, severely errored seconds;
LOSS, loss-of-signal seconds;
UAS, unavailable seconds;
retrains;
retrain count;
resynchronization; and
resynchronization count.