ES2008537A6 - Un aparato para crear una impedancia compleja controlable de terminacion de linea. - Google Patents

Un aparato para crear una impedancia compleja controlable de terminacion de linea.

Info

Publication number
ES2008537A6
ES2008537A6 ES8801804A ES8801804A ES2008537A6 ES 2008537 A6 ES2008537 A6 ES 2008537A6 ES 8801804 A ES8801804 A ES 8801804A ES 8801804 A ES8801804 A ES 8801804A ES 2008537 A6 ES2008537 A6 ES 2008537A6
Authority
ES
Spain
Prior art keywords
circuit
subscriber line
controllable
impedance
termination impedance
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.)
Expired
Application number
ES8801804A
Other languages
English (en)
Inventor
Nils-Olof Johannesson
Anders Gunnar Eriksson
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of ES2008537A6 publication Critical patent/ES2008537A6/es
Expired legal-status Critical Current

Links

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
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/586—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using an electronic circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Networks Using Active Elements (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

SE TRATA DE UN APARATO DE CIRCUITO, INCLUIDO EN UN CIRCUITO DE LINEA DE ABONADO, PARA CREAR UNA IMPEDANCIA VARIABLE DE CONEXION DE LINEA PARA EL CIRCUITO DE LINEA DE ABONADO. COMPRENDE UN CONVERTIDOR DE DOS HILOS A CUATRO HILOS, ES DECIR, UN CIRCUITO DE INTERFAZ DE LINEA DE ABONADO (SLIC) Y UN CIRCUITO DE AUDIOPROCESO DE LINEA DE ABONADO (SLAC). EN ESTE ULTIMO ESTA INCLUIDA USUALMENTE UNA IMPEDANCIA CONTROLABLE (Z) QUE COMPRENDE UN FILTRO DIGITAL. UNA RESISTENCIA (RT), QUE PUEDE SER CONTROLABLE, O UN AMPLIFICADOR CONTROLABLE (ZA), ESTA CONECTADO EN EL LADO DE CUATRO HILOS DEL SLIC PARA FORMAR LA PARTE RESISTIVA DE LA IMPEDANCIA TERMINAL (ZI), MIENTRAS QUE EL FILTRO DIGITAL YA DISPONIBLE EN EL SLAC FORMA LA PARTE REACTIVA. UN CIRCUITO ADITIVO (A1) SUPERPONE LA CONTRIBUCION DE LA CORRIENTE DE LA PARTE RESISTIVA A LA PARTE REACTIVA.
ES8801804A 1987-06-15 1988-06-10 Un aparato para crear una impedancia compleja controlable de terminacion de linea. Expired ES2008537A6 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8702486A SE457923B (sv) 1987-06-15 1987-06-15 Anordning foer att aastadkomma en styrbar linjeavslutningsimpedans

Publications (1)

Publication Number Publication Date
ES2008537A6 true ES2008537A6 (es) 1989-07-16

Family

ID=20368864

Family Applications (1)

Application Number Title Priority Date Filing Date
ES8801804A Expired ES2008537A6 (es) 1987-06-15 1988-06-10 Un aparato para crear una impedancia compleja controlable de terminacion de linea.

Country Status (7)

Country Link
EP (1) EP0321540A1 (es)
AU (1) AU1957688A (es)
ES (1) ES2008537A6 (es)
GR (1) GR880100377A (es)
PT (1) PT87686A (es)
SE (1) SE457923B (es)
WO (1) WO1988010539A1 (es)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5073924A (en) * 1990-05-01 1991-12-17 Frisby Kenneth G Telephone line noise filter apparatus
JPH04280597A (ja) * 1991-03-08 1992-10-06 Nec Corp 加入者回路
IT1259009B (it) * 1992-07-24 1996-03-11 Italtel Telematica Metodo e dispositivo per l'adattamento delle impedenze della terminazione di utente e dell'attacco di utente alla impedenza caratteristica della linea telefonica di utente
EP0642229B1 (de) * 1993-09-02 1999-11-24 Siemens Aktiengesellschaft Schaltungsanordnung zur Erzeugung einer variablen Leitungsabschlussimpedanz
AU681169B2 (en) * 1993-10-01 1997-08-21 Alcatel Australia Limited Line termination circuit
EP0693846A3 (en) * 1994-06-24 1999-05-26 Harris Corporation Telephone subscriber line interface circuit and method
US5583934A (en) * 1995-03-03 1996-12-10 Advanced Micro Devices, Inc. DC level control for an electronic telephone line card
SE511825C2 (sv) * 1998-03-31 1999-12-06 Ericsson Telefon Ab L M Förfarande och anordning i en analog linjekrets
KR100408739B1 (ko) * 2001-12-04 2003-12-11 엘지이노텍 주식회사 교환기 가입자 보드용 아날로그 슬릭 회로
US7062037B2 (en) * 2002-04-30 2006-06-13 Texas Instruments Incorporated Generic line impedance matching circuit using decomposed configurable transfer functions

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0477493B2 (es) * 1980-06-18 1992-12-08 Advanced Micro Devices Inc
JPS5895488A (ja) * 1981-12-02 1983-06-07 Hitachi Ltd ライン回路
DE3586696T2 (de) * 1984-05-30 1993-04-01 Hitachi Ltd Pcm-coder/decoder mit zweidraht/vierdrahtumwandlung.
GB8528843D0 (en) * 1985-11-22 1985-12-24 British Telecomm Codec

Also Published As

Publication number Publication date
SE8702486D0 (sv) 1987-06-15
PT87686A (pt) 1989-05-31
GR880100377A (el) 1989-03-08
WO1988010539A1 (en) 1988-12-29
SE8702486L (sv) 1988-12-16
EP0321540A1 (en) 1989-06-28
SE457923B (sv) 1989-02-06
AU1957688A (en) 1989-01-19

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19990201