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WO2003036831A1 - Procede et appareil pour la suppression de transitoires dans une carte de ligne pots/dsl - Google Patents

Procede et appareil pour la suppression de transitoires dans une carte de ligne pots/dsl Download PDF

Info

Publication number
WO2003036831A1
WO2003036831A1 PCT/US2002/034233 US0234233W WO03036831A1 WO 2003036831 A1 WO2003036831 A1 WO 2003036831A1 US 0234233 W US0234233 W US 0234233W WO 03036831 A1 WO03036831 A1 WO 03036831A1
Authority
WO
WIPO (PCT)
Prior art keywords
pots
high pass
line card
low frequency
dsl
Prior art date
Application number
PCT/US2002/034233
Other languages
English (en)
Inventor
Michael Dziawa
Scott Mcclennon
Francois Tremblay
S. Donald Mcginn
Original Assignee
Catena Networks, Inc.
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
Priority claimed from CA002360108A external-priority patent/CA2360108A1/fr
Application filed by Catena Networks, Inc. filed Critical Catena Networks, Inc.
Priority to EP02778639A priority Critical patent/EP1446902A4/fr
Priority to CA002464317A priority patent/CA2464317A1/fr
Publication of WO2003036831A1 publication Critical patent/WO2003036831A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0002—Modulated-carrier systems analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems

Definitions

  • Disadvantages of this traditional configuration include the need for added equipment, increased physical space requirements, and the cost of the central office POTS splitters. Moreover, deployment of DSL service with existing POTS service typically requires a skilled craftsperson to install and connect the splitter, which results in additional cost to the service provider.
  • the DSL receive path 403 includes an amplifier 406, a filter 405, an analog-to-digital (A/D) converter 404, and the DSL modem 260.
  • the POTS receive path 402 includes a first amplifier 407, a 26 Hz high pass filter 12, the 285 Hz high pass filter 13, the discharger 21 , a second amplifier 408, an A/D converter 31 , and the POTS CODEC 290.
  • the 26 Hz high-pass filter 12 comprises a resistor Rl and a capacitor Cl.
  • the ideal transfer function characteristic is similar to that illustrated in FIG. 2.
  • the impedance generator 80 compares the current loop impedance characteristic to the ideal characteristic and adjusts the transfer function accordingly.
  • the transfer function of the impedance generator 80 is a constant and the variable is the sensed loop current.
  • the output of the impedance generator 80 is fed back into the loop through the adder 45 where it is mixed with the outgoing combined POTS/DSL signal 46. If the output of the impedance generator 80 is lost due to transient signal levels exceeding the dynamic range of the circuit, the feedback path 42 is disrupted and hence the input impedance of the line card 400 deviates from the correct value.
  • the on-off/off-on hook detector 50 triggers transient suppression activity when a hook switch transition is detected.
  • the on-off/off-on hook detector 50 includes a timer 35.
  • the 285 Hz high pass filter 13 is enabled, and the resistor R2 is connected to ground for a period of approximately 30 milliseconds.
  • On-hook to off-hook transitions are detected by an increase in current in the loop by known methods.
  • Off-hook to on-hook transitions are detected by a decrease in current in the loop by known methods.
  • the low frequency energy detector 70 provides a signal to activate the 300 Hz high pass filter 41.
  • the 300 Hz high pass filter 41 is deactivated when the low frequency energy level drops below a predetermined lower threshold. High levels of low frequency energy indicate that a low frequency transient problem may exist.
  • the low frequency energy detector 70 activates the 300 Hz high pass filter 41 and/or provides adjustment inputs to the impedance generator 80 such that the low frequency gain of the impedance generator 80 is reduced.
  • the 300 Hz high-pass filter 41 in the impedance generation path 42 and low frequency gain reduction in the impedance generator 80 are activated for a period of 1 millisecond.
  • the SHUNT state 502 is entered when the clipping detector 30 detects signal clipping in the POTS A/D converter 31.
  • the discharger 21 is activated by the clip detector 30 and lasts for a period of approximately 200 microseconds.
  • the discharger 21 is part of the SHUNT state 502 and is controlled by an autonomous 200 microsecond hardware timer.
  • the duration of the application of the discharger is purposely limited to less than the duration of one symbol period of the DSL signal, which is approximately 250 microseconds, for reasons described previously.
  • the IDLE to FILTER transition 54 is activated when the trigger, or upper, threshold of the low frequency energy detector 70 is crossed; that is, as transient energy level increases.
  • the FILTER to MUTE transition 55 is activated when the release, or lower, threshold of the low frequency energy detector 70 is crossed; that is, as transient energy level decrease and the clipping detector 30 is not triggered.
  • the MUTE to IDLE transition 57 is activated if saturation is not indicated by the clipping detector 30 following the MUTE state 502 delay timeout, which is approximately

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

Une carte de ligne à système téléphonique traditionnel (POTS) et à boucle d'abonné combinés est capable de supprimer l'émission de basses fréquences. La carte de ligne (400) comprend les éléments suivants. Une voie de réception DSL (403) reçoit des données DSL d'une boucle (61). Une voie de réception POTS (402) reçoit des données POTS de la boucle. Une voie d'émission POTS et DSL combinés (401) transmet des données POTS et DSL à la boucle. Un générateur d'impédance (80) est couplé entre la voie de réception POTS et la voie d'émission POTS et DSL combinée pour la synthèse de l'impédance pour les signaux dans la voie de transmission combinée. Un détecteur de basse fréquence (70) applique sélectivement un filtre passe-haut (41) sur une sortie du générateur d'impédance pour le filtrage des transitoires basse fréquence. De plus, un détecteur de signal écrêté (30) et un filtre passe-haut à pôle variable (13) sont prévus dans la voie de réception POTS. Le détecteur de signal écrêté déclenche un commutateur qui décharge l'énergie transitoire stockée, dans la voie de réception. Le filtre passe-haut à pôle variable est modifié pendant l'activité de sonnerie et de décrochage du commutateur par un régisseur (49), en vue de l'atténuation des signaux transitoires.
PCT/US2002/034233 2001-10-24 2002-10-24 Procede et appareil pour la suppression de transitoires dans une carte de ligne pots/dsl WO2003036831A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP02778639A EP1446902A4 (fr) 2001-10-24 2002-10-24 Procede et appareil pour la suppression de transitoires dans une carte de ligne pots/dsl
CA002464317A CA2464317A1 (fr) 2001-10-24 2002-10-24 Procede et appareil pour la suppression de transitoires dans une carte de ligne pots/dsl

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CA002360108A CA2360108A1 (fr) 2001-10-24 2001-10-24 Methode et dispositif de suppression des transitoires pour carte de ligne de service telephonique de base et de ligne d'acces numerique integrees
CA2,360,108 2001-10-24
US10/278,755 US6920217B2 (en) 2001-10-24 2002-10-22 Method and apparatus for transient suppression in an integrated POTS/DSL line card
US10/278,755 2002-10-22

Publications (1)

Publication Number Publication Date
WO2003036831A1 true WO2003036831A1 (fr) 2003-05-01

Family

ID=25682766

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/034233 WO2003036831A1 (fr) 2001-10-24 2002-10-24 Procede et appareil pour la suppression de transitoires dans une carte de ligne pots/dsl

Country Status (3)

Country Link
EP (1) EP1446902A4 (fr)
CN (1) CN1575559A (fr)
WO (1) WO2003036831A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2427110A (en) * 2005-06-10 2006-12-13 Telephone Equipment Current activated solid state switch
AU2006202387B2 (en) * 2005-06-10 2010-02-25 Telephone Equipment (N.S.W) Pty. Limited Current activated solid state switch

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101277128B (zh) * 2007-03-26 2011-09-14 华为技术有限公司 一种阻抗匹配处理系统、方法及其设备
CN102404470A (zh) * 2011-11-01 2012-04-04 华为技术有限公司 一种传统电话业务pots呼叫处理的方法和装置
CN114265334B (zh) * 2020-09-16 2024-04-09 深圳鼎信通达股份有限公司 一种自动模拟环路阻抗匹配探测方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6067316A (en) * 1997-11-19 2000-05-23 Globespan, Inc. Circuit for combined xDSL and other services
US6192109B1 (en) * 1997-12-24 2001-02-20 Globespan, Inc. Apparatus and method for improved DSL communication
US6295343B1 (en) * 1999-07-13 2001-09-25 Catena Networks, Inc. Method and apparatus for combining voice line card and xDSL line card functions

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926544A (en) * 1997-06-06 1999-07-20 Advanced Micro Devices, Inc. Direct current feed with line status change adaptation in a communication system
US6813343B1 (en) * 1999-05-12 2004-11-02 Orckitt Communications Ltd. Method and apparatus for filtering asymmetric digital subscriber line (ADSL) signals
US6459790B1 (en) * 1999-08-27 2002-10-01 Efficient Networks, Inc. System and method for selective filter isolation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6067316A (en) * 1997-11-19 2000-05-23 Globespan, Inc. Circuit for combined xDSL and other services
US6192109B1 (en) * 1997-12-24 2001-02-20 Globespan, Inc. Apparatus and method for improved DSL communication
US6295343B1 (en) * 1999-07-13 2001-09-25 Catena Networks, Inc. Method and apparatus for combining voice line card and xDSL line card functions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1446902A4 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2427110A (en) * 2005-06-10 2006-12-13 Telephone Equipment Current activated solid state switch
AU2006202387B2 (en) * 2005-06-10 2010-02-25 Telephone Equipment (N.S.W) Pty. Limited Current activated solid state switch
GB2427110B (en) * 2005-06-10 2010-06-16 Telephone Equipment Current activated solid state switch

Also Published As

Publication number Publication date
EP1446902A1 (fr) 2004-08-18
CN1575559A (zh) 2005-02-02
EP1446902A4 (fr) 2007-10-10

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