FR2445673A1 - Circuit de ligne telephonique dont l'equilibrage est assure independamment de la longueur de la ligne - Google Patents

Circuit de ligne telephonique dont l'equilibrage est assure independamment de la longueur de la ligne

Info

Publication number
FR2445673A1
FR2445673A1 FR7931596A FR7931596A FR2445673A1 FR 2445673 A1 FR2445673 A1 FR 2445673A1 FR 7931596 A FR7931596 A FR 7931596A FR 7931596 A FR7931596 A FR 7931596A FR 2445673 A1 FR2445673 A1 FR 2445673A1
Authority
FR
France
Prior art keywords
line
length
substrate
balance
circuit
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Withdrawn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
FR7931596A
Other languages
English (en)
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.)
Plessey Handel und Investments AG
Original Assignee
Plessey Handel und Investments AG
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 Plessey Handel und Investments AG filed Critical Plessey Handel und Investments AG
Publication of FR2445673A1 publication Critical patent/FR2445673A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/581—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 a transformer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephonic Communication Services (AREA)

Abstract

L'invention concerne un circuit de ligne formant équipement terminal de dédoublement d'un circuit deux fils en un circuit quatre fils. Selon l'invention, les résistances d'alimentation en courant de ligne R1 et R2 sont des couches formées sur un substrat CS, sur une première face CSF, alors que l'impédance d'équilibrage de ligne Rb est formée par une couche disposée sur l'autre face CSR du même substrat Le coefficient de variation de résistance avec la température de la résistance Rb est négatif si bien que la compensation dés effets de la longueur de la ligne est assurée automatiquement par échauffement plus ou moins grand du substrat par dissipation dans les résistances R1 et R2. Application aux lignes téléphoniques des réseaux comprenant des centraux électroniques.
FR7931596A 1978-12-30 1979-12-24 Circuit de ligne telephonique dont l'equilibrage est assure independamment de la longueur de la ligne Withdrawn FR2445673A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7850385A GB2041700B (en) 1978-12-30 1978-12-30 Balance on 2-4 wire hybrid circuits

Publications (1)

Publication Number Publication Date
FR2445673A1 true FR2445673A1 (fr) 1980-07-25

Family

ID=10502017

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7931596A Withdrawn FR2445673A1 (fr) 1978-12-30 1979-12-24 Circuit de ligne telephonique dont l'equilibrage est assure independamment de la longueur de la ligne

Country Status (12)

Country Link
US (1) US4289939A (fr)
JP (1) JPS5593331A (fr)
BR (1) BR7907893A (fr)
CA (1) CA1131821A (fr)
DE (1) DE2952353A1 (fr)
FR (1) FR2445673A1 (fr)
GB (1) GB2041700B (fr)
IE (1) IE48923B1 (fr)
NL (1) NL7909147A (fr)
NZ (1) NZ192463A (fr)
SE (1) SE437099B (fr)
ZA (1) ZA796286B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4577255A (en) * 1984-06-20 1986-03-18 Itt Corporation Lightning protection circuit for digital subscriber loop interface
US4757528A (en) * 1986-09-05 1988-07-12 Harris Corporation Thermally coupled information transmission across electrical isolation boundaries
USD776637S1 (en) * 2014-09-22 2017-01-17 Ching-Wen Chen Earhook microphone
USD843347S1 (en) 2016-10-18 2019-03-19 Samson Technologies Corp. Head-worn microphone
WO2020016960A1 (fr) 2018-07-18 2020-01-23 三菱電機株式会社 Compensateur de courant haute fréquence et système de climatisation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL269763A (fr) * 1960-09-30
DE1126941B (de) * 1960-09-30 1962-04-05 Siemens Ag Schaltungsanordnung zum Ausregeln des Daempfungsunterschiedes verschieden langer Fernmeldeleitungen
US4132863A (en) * 1977-12-20 1979-01-02 Bell Telephone Laboratories, Incorporated Automatic gain and return loss compensating line circuit

Also Published As

Publication number Publication date
BR7907893A (pt) 1980-07-29
US4289939A (en) 1981-09-15
NL7909147A (nl) 1980-07-02
DE2952353A1 (de) 1980-07-10
SE437099B (sv) 1985-02-04
ZA796286B (en) 1980-11-26
CA1131821A (fr) 1982-09-14
JPS5593331A (en) 1980-07-15
NZ192463A (en) 1982-05-25
JPS6237852B2 (fr) 1987-08-14
DE2952353C2 (fr) 1988-01-21
GB2041700A (en) 1980-09-10
IE48923B1 (en) 1985-06-12
GB2041700B (en) 1982-12-08
SE7910671L (sv) 1980-07-01
IE792529L (en) 1980-06-30

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse