[go: up one dir, main page]

FR2445666A1 - LINE CIRCUIT FOR A TELECOMMUNICATION NETWORK PROVIDING THE CURRENT SUPPLY OF TERMINAL EQUIPMENT FOR TWO-LINE LINES IN FOUR-LINE LINES - Google Patents

LINE CIRCUIT FOR A TELECOMMUNICATION NETWORK PROVIDING THE CURRENT SUPPLY OF TERMINAL EQUIPMENT FOR TWO-LINE LINES IN FOUR-LINE LINES

Info

Publication number
FR2445666A1
FR2445666A1 FR7932036A FR7932036A FR2445666A1 FR 2445666 A1 FR2445666 A1 FR 2445666A1 FR 7932036 A FR7932036 A FR 7932036A FR 7932036 A FR7932036 A FR 7932036A FR 2445666 A1 FR2445666 A1 FR 2445666A1
Authority
FR
France
Prior art keywords
line
terminal equipment
lines
line lines
current supply
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.)
Granted
Application number
FR7932036A
Other languages
French (fr)
Other versions
FR2445666B1 (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 FR2445666A1 publication Critical patent/FR2445666A1/en
Application granted granted Critical
Publication of FR2445666B1 publication Critical patent/FR2445666B1/fr
Granted 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations

Landscapes

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

Abstract

L'invention concerne les équipements terminaux des circuits de lignes téléphoniques. Elle se rapporte à un équipement terminal dans lequel les résistances R1 et R2 assurent à la fois l'alimentation en courant de ligne et la formation de l'impédance de terminaison de ligne. A cet effet, l'amplificateur de retour A2 a une impédance élevée de sortie et l'amplificateur A1 d'aller a une impédance élevée d'entrée. Application aux réseaux téléphoniques à centraux électroniques.The invention relates to terminal equipment of telephone line circuits. It relates to terminal equipment in which resistors R1 and R2 ensure both the supply of line current and the formation of the line termination impedance. For this purpose, the feedback amplifier A2 has a high output impedance and the feedback amplifier A1 has a high input impedance. Application to telephone networks with electronic exchanges.

FR7932036A 1978-12-30 1979-12-28 LINE CIRCUIT FOR A TELECOMMUNICATION NETWORK PROVIDING THE CURRENT SUPPLY OF TERMINAL EQUIPMENT FOR TWO-LINE LINES IN FOUR-LINE LINES Granted FR2445666A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7850384A GB2042848B (en) 1978-12-30 1978-12-30 Line current feed and hybrid arrangement (sytem x)

Publications (2)

Publication Number Publication Date
FR2445666A1 true FR2445666A1 (en) 1980-07-25
FR2445666B1 FR2445666B1 (en) 1984-10-12

Family

ID=10502016

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7932036A Granted FR2445666A1 (en) 1978-12-30 1979-12-28 LINE CIRCUIT FOR A TELECOMMUNICATION NETWORK PROVIDING THE CURRENT SUPPLY OF TERMINAL EQUIPMENT FOR TWO-LINE LINES IN FOUR-LINE LINES

Country Status (11)

Country Link
JP (1) JPS5593363A (en)
AU (1) AU5323179A (en)
BR (1) BR7907891A (en)
DE (1) DE2952259A1 (en)
FR (1) FR2445666A1 (en)
GB (1) GB2042848B (en)
IE (1) IE48895B1 (en)
NL (1) NL7909148A (en)
NZ (1) NZ192462A (en)
SE (1) SE7910670L (en)
ZA (1) ZA796287B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007791A1 (en) * 1980-02-29 1981-09-10 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR INCREASING THE INDUCTIVITY OF A TRANSMITTER
DE3278899D1 (en) * 1981-04-06 1988-09-15 Northern Telecom Ltd Apparatus for coupling signals to or from a two-wire line
DE3138726A1 (en) * 1981-09-29 1983-04-07 Siemens AG, 1000 Berlin und 8000 München Subscriber connection circuit for connecting two-wire subscriber connection lines to a four-wire through-connecting digital time division multiplex exchange
FR2552288B1 (en) * 1983-09-15 1989-03-24 Telecommunications Sa TELEPHONE SUBSCRIBER
US4595802A (en) * 1983-11-29 1986-06-17 Northern Telecom Limited Hybrid circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063475A5 (en) * 1969-10-17 1971-07-09 Labo Cent Telecommunicat
FR2131038A5 (en) * 1971-03-30 1972-11-10 Ass Ouvriers Instr Preci
US3955052A (en) * 1974-11-18 1976-05-04 Tadiran Israel Electronics Industries Ltd. Subscriber unit particularly useful for time-division-multiplex system
US4001524A (en) * 1972-01-04 1977-01-04 Association Des Ouvriers En Instruments De Precision Apparatus for transmitting and receiving pulses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063475A5 (en) * 1969-10-17 1971-07-09 Labo Cent Telecommunicat
FR2131038A5 (en) * 1971-03-30 1972-11-10 Ass Ouvriers Instr Preci
US4001524A (en) * 1972-01-04 1977-01-04 Association Des Ouvriers En Instruments De Precision Apparatus for transmitting and receiving pulses
US3955052A (en) * 1974-11-18 1976-05-04 Tadiran Israel Electronics Industries Ltd. Subscriber unit particularly useful for time-division-multiplex system

Also Published As

Publication number Publication date
IE792528L (en) 1980-06-30
NL7909148A (en) 1980-07-02
DE2952259A1 (en) 1980-07-17
BR7907891A (en) 1980-07-29
GB2042848A (en) 1980-09-24
JPS5593363A (en) 1980-07-15
NZ192462A (en) 1982-05-25
SE7910670L (en) 1980-07-01
GB2042848B (en) 1983-01-06
IE48895B1 (en) 1985-06-12
AU5323179A (en) 1980-07-03
ZA796287B (en) 1980-11-26
FR2445666B1 (en) 1984-10-12

Similar Documents

Publication Publication Date Title
FR2407624A1 (en) CONFERENCE DEVICE FOR A TELECOMMUNICATIONS SYSTEM
SG68584A1 (en) Variable communication bandwidth for conference call initiation
FR2423098A1 (en) ADAPTIVE ELECTRONIC DIFFERENTIAL CIRCUIT
FR2445666A1 (en) LINE CIRCUIT FOR A TELECOMMUNICATION NETWORK PROVIDING THE CURRENT SUPPLY OF TERMINAL EQUIPMENT FOR TWO-LINE LINES IN FOUR-LINE LINES
PT64740A (en) CIRCUIT DEVICE FOR AUTOMATICALLY CONTROLLING CONTINUITY OF TRANSMISSION OF A CONNECTION BETWEEN THE CALL SUBSCRIBER AND THAT CALLED IN A CONVERSATION AND DATA TRANSMISSION NETWORK
DE3167719D1 (en) Telephone circuit
EP0119234A1 (en) Apparatus for the current supply of a subscriber set from an exchange.
ZA816703B (en) Telephone subscriber connection circuits
FR2426365A1 (en) HYBRID CIRCUIT FOR A TWO-FOUR WIRE AUTOMATICALLY ADJUSTED LINK
FR2363952A1 (en) TELEPHONE LINE CIRCUIT
ES545685A0 (en) A LINE CIRCUIT FOR THE CONNECTION OF A TELEPHONE SUBSCRIBER
JPS54159114A (en) Electronic telephone circuit for subscriber channel
GB2146873B (en) Telephone subscriber line circuit
JPS56147545A (en) Automatic telephone transfer device
EP0749654B1 (en) Compact telephone set
FR2441301A1 (en) BIDIRECTIONAL AMPLIFIER FOR SUBSCRIBER TELEPHONE
FR2423096A1 (en) Ringing circuit for centrally controlled telephone exchange junction - has alternating signal source, and bipolar electronic switch output connected to subscriber and timer
ZA801683B (en) A subscriber connection circuit for an exchange of a telecommunications system
AU546508B2 (en) Loudspeaking telephone transformerless line terminating circuit
GR3022896T3 (en) Subscriber line circuit for connection of a subscriber line for the transmission of analogue subscriber signals to a digital time division multiplex telephone exchange
JPS54136252A (en) Two-to-four wire conversion circuit
AU543086B2 (en) Electronic subscriber line interface circuit
FR2464594B1 (en) PARALLEL REGULATION NETWORK OF AN ELECTRICAL VOLTAGE, IN PARTICULAR THE VOLTAGE OF A TELEPHONE LINE FOR A SUBSCRIBER STATION WITH ELECTRONIC CIRCUITS
DE3040271A1 (en) Connection of telephone instruments for conference link - uses send and receive amplifiers with buffering to prevent feedback between microphone and earpiece
AU5188879A (en) Transmission bridge for a telephone subscribers line circuit

Legal Events

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