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 LINESInfo
- 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
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)
- Interface Circuits In Exchanges (AREA)
- Telephonic Communication Services (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Devices For Supply Of Signal Current (AREA)
- Telephone Function (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.
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)
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 |
EP0063414B1 (en) * | 1981-04-06 | 1988-08-10 | Northern Telecom Limited | 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)
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 |
-
1978
- 1978-12-30 GB GB7850384A patent/GB2042848B/en not_active Expired
-
1979
- 1979-10-20 ZA ZA00796287A patent/ZA796287B/en unknown
- 1979-11-27 AU AU53231/79A patent/AU5323179A/en not_active Abandoned
- 1979-12-04 BR BR7907891A patent/BR7907891A/en unknown
- 1979-12-19 NL NL7909148A patent/NL7909148A/en not_active Application Discontinuation
- 1979-12-19 NZ NZ192462A patent/NZ192462A/en unknown
- 1979-12-24 DE DE19792952259 patent/DE2952259A1/en not_active Withdrawn
- 1979-12-27 SE SE7910670A patent/SE7910670L/en not_active Application Discontinuation
- 1979-12-27 JP JP17396679A patent/JPS5593363A/en active Pending
- 1979-12-28 IE IE2528/79A patent/IE48895B1/en unknown
- 1979-12-28 FR FR7932036A patent/FR2445666A1/en active Granted
Patent Citations (4)
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 |
---|---|
AU5323179A (en) | 1980-07-03 |
JPS5593363A (en) | 1980-07-15 |
IE48895B1 (en) | 1985-06-12 |
NZ192462A (en) | 1982-05-25 |
ZA796287B (en) | 1980-11-26 |
DE2952259A1 (en) | 1980-07-17 |
SE7910670L (en) | 1980-07-01 |
NL7909148A (en) | 1980-07-02 |
GB2042848A (en) | 1980-09-24 |
IE792528L (en) | 1980-06-30 |
FR2445666B1 (en) | 1984-10-12 |
GB2042848B (en) | 1983-01-06 |
BR7907891A (en) | 1980-07-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2400280A1 (en) | 4 WIRE-2 WIRE ELECTRONIC CONVERSION CIRCUIT FOR TELECOMMUNICATION NETWORKS | |
FR2407624A1 (en) | CONFERENCE DEVICE FOR A TELECOMMUNICATIONS SYSTEM | |
FR2406358A1 (en) | INTERFACE CIRCUIT FOR TELEPHONE STATION | |
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 | |
IE812202L (en) | Telephone circuit | |
ZA801684B (en) | A subscriber connection circuit for an exchange of a telecommunications system | |
ZA816703B (en) | Telephone subscriber connection circuits | |
FR2426365A1 (en) | HYBRID CIRCUIT FOR A TWO-FOUR WIRE AUTOMATICALLY ADJUSTED LINK | |
ES484232A1 (en) | Separation and balance device for telephone exchanges | |
ES545685A0 (en) | A LINE CIRCUIT FOR THE CONNECTION OF A TELEPHONE SUBSCRIBER | |
US3810247A (en) | Telephone set circuit | |
GB2146873B (en) | Telephone subscriber line circuit | |
DE4142742C2 (en) | System for forwarding a call arriving on a first connecting line via a second connecting line to another telephone connection | |
FR2441301A1 (en) | BIDIRECTIONAL AMPLIFIER FOR SUBSCRIBER TELEPHONE | |
ATE148605T1 (en) | SUBSCRIBER CONNECTION CIRCUIT FOR CONNECTING A SUBSCRIBE LINE FOR THE TRANSMISSION OF ANALOG SUBSCRIBER SIGNALS TO THE EXCHANGE OF A DIGITAL TIME MULTIPLEX TELEPHONE EXCHANGE | |
ZA801683B (en) | A subscriber connection circuit for an exchange of a telecommunications system | |
AU546508B2 (en) | Loudspeaking telephone transformerless line terminating circuit | |
DE4408324A1 (en) | Compact telephone device | |
DE102004049692A1 (en) | Device for switching a telecommunication terminal, uses and methods | |
JPS54136252A (en) | Two-to-four wire conversion circuit | |
AU543086B2 (en) | Electronic subscriber line interface circuit | |
DE19940801A1 (en) | Connecting two telephones with own telephone number at single conductor, involving reserved relays and expansion circuit being activated through digit at dialing of second subscriber | |
DE3040271A1 (en) | Connection of telephone instruments for conference link - uses send and receive amplifiers with buffering to prevent feedback between microphone and earpiece |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
ST | Notification of lapse |