WO2005094048A1 - Circuit arrangement and method for configuring networks - Google Patents

Circuit arrangement and method for configuring networks Download PDF

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Publication number
WO2005094048A1
WO2005094048A1 PCT/EP2005/051122 EP2005051122W WO2005094048A1 WO 2005094048 A1 WO2005094048 A1 WO 2005094048A1 EP 2005051122 W EP2005051122 W EP 2005051122W WO 2005094048 A1 WO2005094048 A1 WO 2005094048A1
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WO
WIPO (PCT)
Prior art keywords
unit
impedances
network
circuit arrangement
tan
Prior art date
Application number
PCT/EP2005/051122
Other languages
German (de)
French (fr)
Inventor
Roland ANGERMÜLLER
Paul Kunisch
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005094048A1 publication Critical patent/WO2005094048A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/005—Interface circuits for subscriber lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Definitions

  • the object of the invention is to provide a further circuit arrangement and an associated method for designing networks.
  • the invention has the advantage that, on the basis of dual-tone multifrequency DTMF tones, the frequency-dependent operational attenuation and the attenuation distortions are measured and the complex line impedances of the subscriber line are determined therefrom.
  • the invention has the advantage that an increase in echo attenuation is achieved by the simulation network adapted to the connecting line, in particular in hybrid circuits, also in connection with Voice-over-IP networks, so that echo cancellers can be dispensed with and Voice quality compared to TDM networks is not deteriorated, despite the longer one-way runtime.
  • the invention has the advantage that the after-image error attenuation is significantly increased by a processor-controlled assignment of an after-image network that is matched to the line properties.
  • the invention has the advantage that, by using coefficients stored in coefficient tables, the configuration of the afterimage network is carried out in line and time-optimized fashion.
  • the invention has the advantage that the subscriber-specific design of the afterimage network is processor-controlled without knowledge, e.g. the cable length and cable coverings can be made.
  • a subscriber terminal TE e.g. can be a telephone, fax or modem, dialing signals in the form of dual-tone multifrequency DTMF tones.
  • These DTMF tones are either evaluated decentrally in the Voice-DSP AE or centrally using a code receiver.
  • the frequency-dependent operating loss of a subscriber line can be calculated because the
  • an optimized after-image network ZN is, for example, processor-controlled in the subscriber circuit ZA.
  • the afterimage network can be formed from coefficients of possible impedance values already stored in a memory area of the processor. The coefficients can also be selected using afterimage networks combined in coefficient tables or by directly calculating a subscriber-specific afterimage network.
  • the designed network has the advantage that this leads to a significant increase in the afterimage error attenuation.
  • the setting unit EE shown in the drawing which can also be referred to as a voice controller, has a module processor that processes messages from the individual ports, such as on-hook, off-hook and dialing information, etc., and forwards them to a higher-level controller.
  • the voice controller sets the transmission-related parameters such as coefficients for the relative levels, impedances, loop currents etc. individually for each port.
  • the damping values or additional damping elements are set in a processor-controlled manner using coefficient tables TAB. These coefficient tables or parts thereof can be loaded into the DSP voice signal processor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The invention relates to a circuit arrangement and an associated method enabling frequency-dependent operational damping and damping distortions of dual tone multifrequency DTMF tones to be measured at the end of a subscriber connection line and the line impedances of the subscriber line to be determined on the basis thereof. The individual simulation impedance of the subscriber connection line is adjusted according to the form of the subscriber connection line.

Description

Beschreibungdescription
Schaltungsanordnung und Verfahren zur Ausgestaltung von NetzwerkenCircuit arrangement and method for designing networks
Bei Voice-over-IP-Netzen werden die geforderten Einweglaufzeiten von < 25ms, insbesondere bei analogen Teilnehmeranschlüssen, nicht immer eingehalten. Ein Überschreiten der Einweglaufzeit erfordert den Einsatz von Echokompensatoren, die jedoch Nachteile mit sich bringen, wie eines schlechteres Einschwingverhalten, eine erhöhte Quantisierungsverzerrung, Noise, verminderte Sprachqualität sowie eine fehlende Bittransparenz und Synchronisationsprobleme bei Fax- und Modemgeräten .With Voice-over-IP networks, the required one-way run times of <25ms, especially with analog subscriber connections, are not always met. Exceeding the one-way runtime requires the use of echo cancellers, which, however, have disadvantages such as poorer transient response, increased quantization distortion, noise, reduced speech quality, as well as a lack of bit transparency and synchronization problems with fax and modem devices.
Aufgabe der Erfindung ist es, eine weitere Schaltungsanordnung und ein dazugehöriges Verfahren zur Ausgestaltung von Netzwerken anzugeben.The object of the invention is to provide a further circuit arrangement and an associated method for designing networks.
Die Aufgabe wird durch die Merkmale des Anspruchs 1 oder 4 gelöst.The object is solved by the features of claim 1 or 4.
Die Erfindung bringt den Vorteil mit sich, dass auf der Grundlage von Dual-Ton-Multifrequenz DTMF-Tönen die frequenz- abhängige Betriebsdämpfung und, die Dämpfungsverzerrungen gemessen und daraus die komplexen Leitungsimpedanzen der Teilnehmeranschlussleitung bestimmt werden.The invention has the advantage that, on the basis of dual-tone multifrequency DTMF tones, the frequency-dependent operational attenuation and the attenuation distortions are measured and the complex line impedances of the subscriber line are determined therefrom.
Die Erfindung bringt den Vorteil mit sich, dass durch das an die Anschlussleitung angepasste Nachbildungsnetzwerk, insbesondere in Gabelschaltungen, auch in Verbindung mit Voice- over-IP-Netzen eine Erhöhung der Echodämpfung erreicht wird, so dass auf Echokompensatoren verzichtet werden kann und die Sprachqualität gegenüber TDM-Netzen nicht verschlechtert wird, trotz höherer Einweglaufzeit.The invention has the advantage that an increase in echo attenuation is achieved by the simulation network adapted to the connecting line, in particular in hybrid circuits, also in connection with Voice-over-IP networks, so that echo cancellers can be dispensed with and Voice quality compared to TDM networks is not deteriorated, despite the longer one-way runtime.
Die Erfindung bringt den Vorteil mit sich, dass durch eine prozessorgesteuerte Zuweisung eines auf die Leitungseigenschaften abgestimmten Nachbildnetzwerkes die Nachbildfehlerdämpfung signifikant erhöht wird.The invention has the advantage that the after-image error attenuation is significantly increased by a processor-controlled assignment of an after-image network that is matched to the line properties.
Die Erfindung bringt den Vorteil mit sich, dass durch die Verwendung von in Koeffiziententabellen hinterlegten Koeffizienten die Ausgestaltung des Nachbildnetzwerkes leitungs- und zeitoptimiert ausgeführt wird.The invention has the advantage that, by using coefficients stored in coefficient tables, the configuration of the afterimage network is carried out in line and time-optimized fashion.
Die Erfindung bringt den Vorteil mit sich, dass die teilneh- merindividuelle Ausgestaltung des Nachbildnetzwerkes prozessorgesteuert ohne Kenntnis z.B. der Leitungslänge und Leitungsbeläge vorgenommen werden kann.The invention has the advantage that the subscriber-specific design of the afterimage network is processor-controlled without knowledge, e.g. the cable length and cable coverings can be made.
Weitere Besonderheiten der Erfindung werden aus der nachfol- genden näheren Erläuterung zu einer schematischen Zeichnung ersichtlich.Further special features of the invention will become apparent from the following detailed explanation of a schematic drawing.
Zum Verbindungsaufbau werden von einem Teilnehmerendgerät TE, das z.B. ein Telefonapparat, Fax oder Modem sein kann, Wähl- signale in Form von Dual-Ton-Multifrequenz DTMF-Tönen gesendet. Diese DTMF-Töne werden entweder im Voice-DSP AE dezentral oder mit Hilfe eines Code-Receivers zentral ausgewertet. Durch Messung der Empfangspegel der einzelnen DTMF-Töne in der Einheit DSP kann die frequenzabhängige Betriebsdämpfung einer Teilnehmeranschlussleitung berechnet werden, da dieTo establish a connection, a subscriber terminal TE, e.g. can be a telephone, fax or modem, dialing signals in the form of dual-tone multifrequency DTMF tones. These DTMF tones are either evaluated decentrally in the Voice-DSP AE or centrally using a code receiver. By measuring the reception level of the individual DTMF tones in the DSP unit, the frequency-dependent operating loss of a subscriber line can be calculated because the
Sendepegel der DTMF-Töne bekannt sind. Die Kenntnis der frequenzabhängigen Betriebsdämpfung wiederum ermöglicht eine Aussage über die komplexen Impedanzen Z Ltg der verbindenden Teilnehmeranschlußleitung TAN, die auch als Übertragungsstrecke bezeichnet werden kann. Daraus abgeleitet wird in der Teilnehmerschaltung ZA beispielsweise im Netzknoten ein optimiertes Nachbildnetzwerk ZN prozessorgesteuert ausgebildet. Die Ausbildung des Nachbildnetzwerkes kann dazu von bereits in einem Speicherbereich des Prozessors hinterlegten Koeffizienten möglicher Impedanzwerte erfolgen. Eine Auswahl der Koeffizienten kann dabei auch unter Ausnutzung von in Koeffizienten-Tabellen zusammengefassten Nachbildnetzwerken oder durch unmittelbare Berechnung eines teilnehmerindividuellen Nachbildnetzwerkes erfolgen. Das ausgestaltete Netzwerk bringt den Vorteil mit sich, dass dieses zu einer signifikanten Erhöhung der Nachbildfehlerdämpfung führt. Da die Gabelübergangsdämpfung unmittelbar die Echodämpfung mitbestimmt, lassen sich höhere Laufzeiten ohne Verminderung der Sprachqualität erzielen. So wird, bei gleicher Sprachqualität, durch eine Erhöhung der Echodämpfung um 6dB eine Verdopplung der maximal zulässigen Laufzeit möglich, ohne Echokompensatoren zu verwenden . Die in der Zeichnung abgebildete Einstelleinheit EE die auch als Voice-Contoller zu bezeichnen ist weist einen Baugruppenprozessor auf der Meldungen der einzelnen Ports wie beispielsweise on-hook, off-hook sowie Wahlinformationen etc. verarbeitet und diese an einen übergeordneten Controller wei- terleitet. Der Voice-Controller stellt portindividuell die übertragungstechnischen Parameter wie Koeffizienten für die relativen Pegel, Impedanzen, Schleifenströme etc. ein. Die Einstellung der Dämpfungswerte bzw. Zusatzdämpfungselemente erfolgt prozessorgesteuert mit Hilfe von Koeffiziententabel- len TAB. Diese Koeffiziententabellen bzw. Teile daraus können in den Voice Signalprozessor DSP geladen werden. Transmission levels of the DTMF tones are known. Knowledge of the frequency-dependent operational damping in turn enables a statement to be made about the complex impedances Z Ltg of the connecting ones Subscriber line TAN, which can also be referred to as a transmission link. Derived from this, an optimized after-image network ZN is, for example, processor-controlled in the subscriber circuit ZA. For this purpose, the afterimage network can be formed from coefficients of possible impedance values already stored in a memory area of the processor. The coefficients can also be selected using afterimage networks combined in coefficient tables or by directly calculating a subscriber-specific afterimage network. The designed network has the advantage that this leads to a significant increase in the afterimage error attenuation. Since the fork transition attenuation directly influences the echo attenuation, longer runtimes can be achieved without reducing the speech quality. For example, with the same speech quality, an increase in the echo attenuation by 6 dB makes it possible to double the maximum permissible transit time without using echo cancellers. The setting unit EE shown in the drawing, which can also be referred to as a voice controller, has a module processor that processes messages from the individual ports, such as on-hook, off-hook and dialing information, etc., and forwards them to a higher-level controller. The voice controller sets the transmission-related parameters such as coefficients for the relative levels, impedances, loop currents etc. individually for each port. The damping values or additional damping elements are set in a processor-controlled manner using coefficient tables TAB. These coefficient tables or parts thereof can be loaded into the DSP voice signal processor.

Claims

Patentansprüche claims
1. Schaltungsanordnung zur impedanzmäßigen Anpassung einer Übertragungsstrecke (TAN) an eine in einer Empfangseinheit (E) angeordneten Netzeinheit mit einer mindestens aus einer Frequenz gebildeten Referenzsignale abgebenden Sendeeinheit (SE) , einer die Referenzsignale in der Empfangseinheit (E) auswertenden Auswerteeinheit (AE) und eine Anpassungseinheit (ZA) wobei abgeleitet vom Messergebnis der Auswerteeinheit (AE) prozessorgesteuert die komplexen Impedanzen des Nachbildnetzwerkes der Anpassungseinheit (ZA) den komplexen Impedanzen der Übertragungsstrecke (TAN) angepasst werden.1. Circuit arrangement for impedance matching of a transmission link (TAN) to a network unit arranged in a receiving unit (E) with a transmitting unit (SE) emitting at least reference signals formed from a frequency, an evaluating unit (AE) evaluating the reference signals in the receiving unit (E) and an adaptation unit (ZA), the complex impedances of the afterimage network of the adaptation unit (ZA) being adapted to the complex impedances of the transmission path (TAN) in a processor-controlled manner, derived from the measurement result of the evaluation unit (AE).
2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die in der Empfangseinheit (E) angeordnete Netzeinheit2. Circuit arrangement according to claim 1, characterized in that the network unit arranged in the receiving unit (E)
(ZA) eine Nachbildungseinheit einer Gabelschaltung ist.(ZA) is a replica of a hybrid.
3. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass in der Empfangseinheit (E) eine Tabelle mit Koeffizienten (TAB) von möglichen komplexen Impedanzen einer Netzein- heit (ZA) vorgesehen ist, wobei zur Anpassung der Netzeinheit (ZA) an die Impedanzen der Übertragungsstrecke (TAN) prozessorgesteuert auf in Tabellen (TAB) zusammengefassten Koeffizienten möglicher Impedanzen zurückgegriffen werden kann.3. Circuit arrangement according to claim 1, characterized in that a table with coefficients (TAB) of possible complex impedances of a network unit (ZA) is provided in the receiving unit (E), with the adaptation of the network unit (ZA) to the impedances of the Transmission path (TAN) under processor control can use the coefficients of possible impedances summarized in tables (TAB).
4. Verfahren zur impedanzmäßigen Anpassung einer Übertragungsstrecke (TAN) an eine in einer Empfangseinheit (E) angeordneten Netzeinheit (ZA) wobei ein mindestens aus einer Fre- quenz zusammengesetztes Referenzsignal von einer Ξendeeinheit (SE) zur Empfangseinheit (E) abgegeben wird, dass in der Empfangseinheit mindestens ein Referenzsignal ausgewertet wird und die komplexe Impedanzen der Netzeinheit (ZA) an die Impedanzen der Übertragungsstrecke (TAN) ange- passt werden.4. Method for the impedance-based adaptation of a transmission link (TAN) to a network unit (ZA) arranged in a receiving unit (E), one of which consists of at least one frequency a composite reference signal is sent from a Ξend unit (SE) to the receiving unit (E), that at least one reference signal is evaluated in the receiving unit and the complex impedances of the network unit (ZA) are adapted to the impedances of the transmission link (TAN).
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass auf der Grundlage des Messergebnisses die Koeffizienten der komplexen Impedanzen der Netzeinheit aus Tabellen (TAB) entnommen werden. 5. The method according to claim 4, characterized in that on the basis of the measurement result, the coefficients of the complex impedances of the network unit are taken from tables (TAB).
PCT/EP2005/051122 2004-03-23 2005-03-11 Circuit arrangement and method for configuring networks WO2005094048A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410014197 DE102004014197A1 (en) 2004-03-23 2004-03-23 Circuit arrangement and method for designing networks
DE102004014197.5 2004-03-23

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WO2005094048A1 true WO2005094048A1 (en) 2005-10-06

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5258713A (en) * 1992-04-16 1993-11-02 Northern Telecom Limited Impedance generator for a telephone line interface circuit
WO2001049012A1 (en) * 1999-12-27 2001-07-05 Nortel Networks Limited Line interface circuit with two feedback loops to synthesise required impedance
US6301356B1 (en) * 1996-10-02 2001-10-09 Telefonaktiebolaget Lm Ericsson (Publ) Line circuit and method for a line circuit
US20020119753A1 (en) * 2000-10-11 2002-08-29 Antonio Digiandomenico Programmable echo cancellation filter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD261692A1 (en) * 1987-06-12 1988-11-02 Nachrichten Elektronik Zft METHOD FOR AUTOMATICALLY ADJUSTING A TRAINING NETWORK TO THE IMPEDANCE OF A TWO-WIRE CONNECTION OF A FORK SWITCH IN TELEPHONE TRANSMISSION APPARATUS
DE10102867A1 (en) * 2001-01-23 2002-09-05 Siemens Ag Analysis method for the data transfer properties of a data carrier in the form of twin wire cable uses remotely controlled modem with fast Fourier transform module for analysis of signal
DE10119793A1 (en) * 2001-04-23 2002-10-31 Siemens Ag Method and circuit arrangement for impedance matching of an analog telecommunication connection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5258713A (en) * 1992-04-16 1993-11-02 Northern Telecom Limited Impedance generator for a telephone line interface circuit
US6301356B1 (en) * 1996-10-02 2001-10-09 Telefonaktiebolaget Lm Ericsson (Publ) Line circuit and method for a line circuit
WO2001049012A1 (en) * 1999-12-27 2001-07-05 Nortel Networks Limited Line interface circuit with two feedback loops to synthesise required impedance
US20020119753A1 (en) * 2000-10-11 2002-08-29 Antonio Digiandomenico Programmable echo cancellation filter

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