GB2523703A - Fault identification using line attenuations - Google Patents

Fault identification using line attenuations Download PDF

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Publication number
GB2523703A
GB2523703A GB1511625.4A GB201511625A GB2523703A GB 2523703 A GB2523703 A GB 2523703A GB 201511625 A GB201511625 A GB 201511625A GB 2523703 A GB2523703 A GB 2523703A
Authority
GB
United Kingdom
Prior art keywords
line
population
attenuation ratio
pairs
attenuation
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.)
Withdrawn
Application number
GB1511625.4A
Other versions
GB201511625D0 (en
Inventor
Philip Martin Bull
David Michael Rohlfing
Paul Robert Benyon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Telecommunications PLC
Original Assignee
British Telecommunications PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Telecommunications PLC filed Critical British Telecommunications PLC
Publication of GB201511625D0 publication Critical patent/GB201511625D0/en
Publication of GB2523703A publication Critical patent/GB2523703A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H04B3/48—Testing attenuation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The present invention presents a method of identifying faults in a DSL line using upstream and downstream attenuation measurements, which can be obtained directly from the DSLAM or CPE, thus requiring no specialist test equipment nor disrupting service. A downstream over upstream attenuation ratio is calculated for a line, with calculations repeated over a population of lines. The distribution of ratios, as well as upper and lower thresholds, is determined based on the population. A line is identified as being potentially faulty if it has an attenuation ratio above the upper threshold or below the lower threshold. Specifically, an attenuation ratio below the lower threshold is identified as having a high resistance joint fault (caused by an imperfect connection or corrosion at a joint in at least one of the pairs of a line), and a ratio above the upper threshold as a shunt (caused by degradation of the insulation between the pairs of a line, and often coupled with water ingress).
GB1511625.4A 2012-12-21 2013-12-06 Fault identification using line attenuations Withdrawn GB2523703A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP12250187.7A EP2747401A1 (en) 2012-12-21 2012-12-21 Fault identification using line attenuations
PCT/GB2013/000531 WO2014096752A2 (en) 2012-12-21 2013-12-06 Fault identification using line attenuations

Publications (2)

Publication Number Publication Date
GB201511625D0 GB201511625D0 (en) 2015-08-19
GB2523703A true GB2523703A (en) 2015-09-02

Family

ID=47552840

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1511625.4A Withdrawn GB2523703A (en) 2012-12-21 2013-12-06 Fault identification using line attenuations

Country Status (5)

Country Link
US (1) US9584183B2 (en)
EP (2) EP2747401A1 (en)
CN (1) CN105009559B (en)
GB (1) GB2523703A (en)
WO (1) WO2014096752A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2572381B (en) * 2018-03-28 2021-04-14 British Telecomm DSL line fault identification
US10880430B2 (en) * 2018-11-16 2020-12-29 Level 3 Communications, Llc Systems, methods, and storage media for testing local loops of telecommunications networks
CN109739077B (en) * 2018-11-27 2021-12-17 北京北大千方科技有限公司 Safe starting method and circuit system of yellow flashing unit of annunciator system
US11641219B2 (en) 2019-03-29 2023-05-02 British Telecommunications Public Limited Company DSL line interference susceptibility

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070036339A1 (en) * 2005-06-02 2007-02-15 Adaptive Spectrum And Signal Alignment, Inc. Self-learning and self-adjusting DSL system
US20080205501A1 (en) * 2005-07-10 2008-08-28 Cioffi John M Dsl System Estimation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002246853A1 (en) * 2000-10-19 2002-07-30 Teradyne, Inc. Method and apparatus for bridged tap impact analysis
US7620154B2 (en) * 2002-12-23 2009-11-17 Cambron G Keith Equivalent working length determinative system for digital subscriber line circuits
US7809116B2 (en) 2003-12-07 2010-10-05 Adaptive Spectrum And Signal Alignment, Inc. DSL system estimation including known DSL line scanning and bad splice detection capability
US7729477B2 (en) 2006-02-17 2010-06-01 At&T Intellectual Property I, L.P. System and method for detecting continuity of network lines
US7876815B2 (en) * 2007-05-15 2011-01-25 At&T Intellectual Property I, L.P. Methods and apparatus to qualify a wire-pair for a digital subscriber line (DSL) service
EP2507917A1 (en) 2009-11-30 2012-10-10 Aware, Inc. Methods and systems for detecting metallic faults affecting communications links

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070036339A1 (en) * 2005-06-02 2007-02-15 Adaptive Spectrum And Signal Alignment, Inc. Self-learning and self-adjusting DSL system
US20080205501A1 (en) * 2005-07-10 2008-08-28 Cioffi John M Dsl System Estimation

Also Published As

Publication number Publication date
GB201511625D0 (en) 2015-08-19
EP2936792B1 (en) 2020-07-29
EP2936792A2 (en) 2015-10-28
US20150349842A1 (en) 2015-12-03
EP2747401A1 (en) 2014-06-25
WO2014096752A3 (en) 2014-10-16
CN105009559A (en) 2015-10-28
CN105009559B (en) 2018-05-01
US9584183B2 (en) 2017-02-28
WO2014096752A2 (en) 2014-06-26

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)