CA2522902A1 - Method and system for improved single-ended loop make-up identification - Google Patents
Method and system for improved single-ended loop make-up identification Download PDFInfo
- Publication number
- CA2522902A1 CA2522902A1 CA002522902A CA2522902A CA2522902A1 CA 2522902 A1 CA2522902 A1 CA 2522902A1 CA 002522902 A CA002522902 A CA 002522902A CA 2522902 A CA2522902 A CA 2522902A CA 2522902 A1 CA2522902 A1 CA 2522902A1
- Authority
- CA
- Canada
- Prior art keywords
- loop
- waveform
- acquired data
- discontinuities
- comparing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
- H04B3/493—Testing echo effects or singing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
- H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
- H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
- H04M3/305—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop testing of physical copper line parameters, e.g. capacitance or resistance
- H04M3/306—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop testing of physical copper line parameters, e.g. capacitance or resistance for frequencies above the voice frequency, e.g. xDSL line qualification
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2209—Arrangements for supervision, monitoring or testing for lines also used for data transmission
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.
Claims (10)
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.
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.
2. The method of claim 1 further comprising the steps of:
subtracting the waveform corresponding to the chosen topology from the acquired data to produce compensated data;
finding a next echo present in the compensated data;
iteratively repeating said hypothesizing, computing, comparing and subtracting steps for each discontinuity in the loop until no echoes are found; and, identifying the presence or absence and location of one or more gauge changes and bridged taps, the length of the loop including the length of each bridged tap, and the gauge of each loop section.
subtracting the waveform corresponding to the chosen topology from the acquired data to produce compensated data;
finding a next echo present in the compensated data;
iteratively repeating said hypothesizing, computing, comparing and subtracting steps for each discontinuity in the loop until no echoes are found; and, identifying the presence or absence and location of one or more gauge changes and bridged taps, the length of the loop including the length of each bridged tap, and the gauge of each loop section.
3. The method of claim 1 wherein the comparing step further comprises the used of maximum a-posteriori probability (MAP) estimation taking into account knowledge regarding the loop plant to choose the topology whose corresponding waveform best matches the acquired data.
4. The method of claim 1 wherein the step of transmitting and acquiring data further comprises the step of calibrating the acquired data based on a calibration ratio and a null response for each gauge.
5. The method of claim1 wherein the branch and band technique issued to limit the number of paths searched in the comparing step.
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:
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.
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.
7. The system of claim 6 further comprising:
a means for subtracting the waveform corresponding to the chosen topology from the acquired data to produce compensated data;
a means for finding a next echo present in the compensated data; and, a means for identifying the presence or absence and location of one or more gauge changes and bridged taps, the length of the loop including the length of each bridged tap, and the gauge of each loop section.
a means for subtracting the waveform corresponding to the chosen topology from the acquired data to produce compensated data;
a means for finding a next echo present in the compensated data; and, a means for identifying the presence or absence and location of one or more gauge changes and bridged taps, the length of the loop including the length of each bridged tap, and the gauge of each loop section.
8. The system of claim 6 further comprising a maximum a-posteriori probability (MAP) estimator for taking into account knowledge regarding the loop plant to choose the topology whose corresponding waveform best matches the acquired data.
9. The system of claim 6 further comprising a means for calibrating the acquired data based on a calibration ratio and a null response for each gauge.
10. The system of claim 6 wherein the branch and band technique is used to limit the number of paths searched by the comparing means.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47081503P | 2003-05-15 | 2003-05-15 | |
| US60/470,815 | 2003-05-15 | ||
| PCT/US2004/015297 WO2004104531A2 (en) | 2003-05-15 | 2004-05-14 | Method and system for improved single-ended loop make-up identification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2522902A1 true CA2522902A1 (en) | 2004-12-02 |
| CA2522902C CA2522902C (en) | 2010-10-12 |
Family
ID=33476759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2522902A Expired - Fee Related CA2522902C (en) | 2003-05-15 | 2004-05-14 | Method and system for improved single-ended loop make-up identification |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7010441B2 (en) |
| EP (1) | EP1623239B1 (en) |
| JP (1) | JP4317873B2 (en) |
| CA (1) | CA2522902C (en) |
| WO (1) | WO2004104531A2 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7435260B2 (en) * | 1999-08-13 | 2008-10-14 | Ferree Bret A | Use of morphogenetic proteins to treat human disc disease |
| US7282922B2 (en) * | 2005-01-31 | 2007-10-16 | University Of Utah Research Foundation | Wire network mapping method and apparatus using impulse responses |
| JP4891995B2 (en) * | 2005-07-10 | 2012-03-07 | アダプティブ スペクトラム アンド シグナル アラインメント インコーポレイテッド | Estimation of digital subscriber line system |
| US8902958B2 (en) * | 2006-05-01 | 2014-12-02 | Adaptive Spectrum And Signal Alignment, Inc. | Methods and apparatus to combine data from multiple source to characterize communication systems |
| US20080310617A1 (en) * | 2007-06-14 | 2008-12-18 | Infineon Technologies Ag | Transmission Links |
| CN101562487B (en) * | 2008-04-18 | 2013-09-11 | 华为技术有限公司 | Frequency spectrum optimization method, device and digital user line system |
| EP2117129B1 (en) * | 2008-05-07 | 2015-11-04 | Alcatel Lucent | Access network monitoring device and method |
| US8295444B2 (en) * | 2008-06-13 | 2012-10-23 | Ikanos Communications, Inc. | Systems and methods for performing loop analysis based on un-calibrated single-ended line testing |
| WO2010114531A1 (en) * | 2009-03-31 | 2010-10-07 | Hewlett-Packard Development Company, L.P. | Determining power topology of a plurality of computer systems |
| US8416700B2 (en) | 2010-08-11 | 2013-04-09 | At&T Intellectual Property I, Lp | Intelligent loop diagnostics for digital subscriber line services to support a service assurance system |
| US8917818B2 (en) * | 2013-01-17 | 2014-12-23 | Jds Uniphase Corporation | Method and system for determining a number of load coils in a transmission line |
| US10753979B2 (en) * | 2013-04-04 | 2020-08-25 | The Boeing Company | In-situ battery monitoring system |
| WO2014209180A1 (en) | 2013-06-27 | 2014-12-31 | Telefonaktiebolaget Lm Ericsson (Publ) | A test device and a method for determining communication characteristics of a metal cable |
| EP3070917A1 (en) * | 2015-03-17 | 2016-09-21 | Alcatel Lucent | Method for estimating a location of a bridge tap |
| US10901017B2 (en) | 2017-08-09 | 2021-01-26 | Nvidia Corporation | Systematic methodology to remove reflections from I/O measurements |
| US11656264B2 (en) * | 2021-07-13 | 2023-05-23 | Dell Products L.P. | High-speed signal subsystem testing system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4525789A (en) * | 1982-07-16 | 1985-06-25 | At&T Bell Laboratories | Programmable network tester with data formatter |
| US6904110B2 (en) * | 1997-07-31 | 2005-06-07 | Francois Trans | Channel equalization system and method |
| WO2001001158A1 (en) * | 1999-06-25 | 2001-01-04 | Telcordia Technologies, Inc. | Single ended measurement method and system for determining subscriber loop make up |
| US6724859B1 (en) * | 1999-09-30 | 2004-04-20 | Telcordia Technologies, Inc. | Method for determining subscriber loop make-up by subtracting calculated signals |
| ES2240237T3 (en) * | 1999-09-30 | 2005-10-16 | Telcordia Technologies, Inc. | IMPROVED PROCEDURE INTENDED TO ESTABLISH THE ASSEMBLY OF A SUBSCRIBER LINE. |
| US6744854B2 (en) * | 1999-12-09 | 2004-06-01 | Harris Corporation | Detection of bridge taps by frequency domain reflectometry-based signal processing with precursor signal conditioning |
| US6668041B2 (en) * | 2001-05-09 | 2003-12-23 | Centillium Communications, Inc. | Single ended line probing in DSL system |
-
2004
- 2004-05-14 JP JP2006514874A patent/JP4317873B2/en not_active Expired - Fee Related
- 2004-05-14 WO PCT/US2004/015297 patent/WO2004104531A2/en active Application Filing
- 2004-05-14 CA CA2522902A patent/CA2522902C/en not_active Expired - Fee Related
- 2004-05-14 EP EP04752331.1A patent/EP1623239B1/en not_active Expired - Fee Related
- 2004-05-14 US US10/845,865 patent/US7010441B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US20040230390A1 (en) | 2004-11-18 |
| JP4317873B2 (en) | 2009-08-19 |
| WO2004104531A3 (en) | 2005-01-20 |
| EP1623239A4 (en) | 2006-08-16 |
| EP1623239B1 (en) | 2013-11-06 |
| CA2522902C (en) | 2010-10-12 |
| WO2004104531A2 (en) | 2004-12-02 |
| EP1623239A2 (en) | 2006-02-08 |
| US7010441B2 (en) | 2006-03-07 |
| JP2006526365A (en) | 2006-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140514 |