PT87686A - Aparelho para obter uma impedancia terminal controlavel de linha - Google Patents

Aparelho para obter uma impedancia terminal controlavel de linha

Info

Publication number
PT87686A
PT87686A PT8768688A PT8768688A PT87686A PT 87686 A PT87686 A PT 87686A PT 8768688 A PT8768688 A PT 8768688A PT 8768688 A PT8768688 A PT 8768688A PT 87686 A PT87686 A PT 87686A
Authority
PT
Portugal
Prior art keywords
obtaining
line
terminal impedance
controllable terminal
controllable
Prior art date
Application number
PT8768688A
Other languages
English (en)
Portuguese (pt)
Inventor
Nils-Olof Johannesson
Anders Gunnar Erisson
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of PT87686A publication Critical patent/PT87686A/pt

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)
  • Interface Circuits In Exchanges (AREA)
  • Networks Using Active Elements (AREA)
  • Devices For Supply Of Signal Current (AREA)
PT8768688A 1987-06-15 1988-06-08 Aparelho para obter uma impedancia terminal controlavel de linha PT87686A (pt)

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
PT87686A true PT87686A (pt) 1989-05-31

Family

ID=20368864

Family Applications (1)

Application Number Title Priority Date Filing Date
PT8768688A PT87686A (pt) 1987-06-15 1988-06-08 Aparelho para obter uma impedancia terminal controlavel de linha

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
ATE187029T1 (de) * 1993-09-02 1999-12-15 Siemens Ag Schaltungsanordnung zur erzeugung einer variablen leitungsabschlussimpedanz
AU681169B2 (en) * 1993-10-01 1997-08-21 Alcatel Australia Limited Line termination circuit
JPH0851651A (ja) * 1994-06-24 1996-02-20 Harris Corp 加入者線インタフェース回路及びインピーダンス整合方法並びにハイブリッド間エコーキャンセレーション方法
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
WO1981003728A1 (en) * 1980-06-18 1981-12-24 Advanced Micro Devices Inc Subscriber line audio processing circuit apparatus
JPS5895488A (ja) * 1981-12-02 1983-06-07 Hitachi Ltd ライン回路
EP0163298B1 (en) * 1984-05-30 1992-09-30 Hitachi, Ltd. Pcm coder/decoder with two-wire/four-wire conversion
GB8528843D0 (en) * 1985-11-22 1985-12-24 British Telecomm Codec

Also Published As

Publication number Publication date
GR880100377A (el) 1989-03-08
SE457923B (sv) 1989-02-06
ES2008537A6 (es) 1989-07-16
WO1988010539A1 (en) 1988-12-29
SE8702486L (sv) 1988-12-16
SE8702486D0 (sv) 1987-06-15
EP0321540A1 (en) 1989-06-28
AU1957688A (en) 1989-01-19

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