FR2348609A1 - Telephone connection for bidirectional and two unidirectional lines - uses two coupled transistors with output provided via transformer to ensure convergence - Google Patents

Telephone connection for bidirectional and two unidirectional lines - uses two coupled transistors with output provided via transformer to ensure convergence

Info

Publication number
FR2348609A1
FR2348609A1 FR7611299A FR7611299A FR2348609A1 FR 2348609 A1 FR2348609 A1 FR 2348609A1 FR 7611299 A FR7611299 A FR 7611299A FR 7611299 A FR7611299 A FR 7611299A FR 2348609 A1 FR2348609 A1 FR 2348609A1
Authority
FR
France
Prior art keywords
bidirectional
pairs
provided via
lines
telephone connection
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
FR7611299A
Other languages
French (fr)
Other versions
FR2348609B1 (en
Inventor
Claude Le Dily
Francois Ferret
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT SA
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 Alcatel CIT SA filed Critical Alcatel CIT SA
Priority to FR7611299A priority Critical patent/FR2348609A1/en
Publication of FR2348609A1 publication Critical patent/FR2348609A1/en
Application granted granted Critical
Publication of FR2348609B1 publication Critical patent/FR2348609B1/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
    • H04B1/586—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)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Convergence between a two way telephone line and two pairs of unidirectional lines insuring a first degree of weakening between the two pairs of lines and a lesser degree of weakening between the two way line and each of the two pairs of lines, is controlled by a pair of transistors (7) (12), and an emitting resistance (11). The pairs of one way wires are connected from (3) to (6). The two way wire is connected across terminals (1) and (2) at opposite ends of a transformer (21). The other winding of the transformer is connected between a terminal (16) connected via resistors (10, 15) to the emitters of the two transistors and the negative supply voltage (-V) via a further resistance (11).
FR7611299A 1976-04-16 1976-04-16 Telephone connection for bidirectional and two unidirectional lines - uses two coupled transistors with output provided via transformer to ensure convergence Granted FR2348609A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7611299A FR2348609A1 (en) 1976-04-16 1976-04-16 Telephone connection for bidirectional and two unidirectional lines - uses two coupled transistors with output provided via transformer to ensure convergence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7611299A FR2348609A1 (en) 1976-04-16 1976-04-16 Telephone connection for bidirectional and two unidirectional lines - uses two coupled transistors with output provided via transformer to ensure convergence

Publications (2)

Publication Number Publication Date
FR2348609A1 true FR2348609A1 (en) 1977-11-10
FR2348609B1 FR2348609B1 (en) 1980-05-23

Family

ID=9171938

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7611299A Granted FR2348609A1 (en) 1976-04-16 1976-04-16 Telephone connection for bidirectional and two unidirectional lines - uses two coupled transistors with output provided via transformer to ensure convergence

Country Status (1)

Country Link
FR (1) FR2348609A1 (en)

Also Published As

Publication number Publication date
FR2348609B1 (en) 1980-05-23

Similar Documents

Publication Publication Date Title
ES504913A0 (en) AN INTERFACE CIRCUIT FOR A SUBSCRIBER LINE WITH IMPEDANCE SYNTHESIS-DOR
SE8008239L (en) DEVICE FOR CONTROLING A PHONE LINE FEED POWER
MY103685A (en) Voltage dividing resistor device
SE7905480L (en) CONNECTION DEVICE FOR CONNECTING A TELEPHONE CORD TO A TELEPHONE EXCHANGE
FR2348609A1 (en) Telephone connection for bidirectional and two unidirectional lines - uses two coupled transistors with output provided via transformer to ensure convergence
GB853277A (en) Improvements in or relating to inverter circuits
SE8008104L (en) PHONE CONTROL CIRCUIT
JPS56158558A (en) Digital communication system
ATE3487T1 (en) TRANSFORMER-FREE HYBRID CIRCUIT.
SE7902832L (en) SUBSCRIBER CIRCUIT INCLUDING A SYMMETRIC POWER AMPLIFIER FOR SUPPLYING A SUBSCRIBER MANAGEMENT
GB975520A (en) Improvements in or relating to electric gating circuits employing transistors
ES545685A0 (en) A LINE CIRCUIT FOR THE CONNECTION OF A TELEPHONE SUBSCRIBER
JPS6486222A (en) Constant-voltage circuit
JPS56161755A (en) Power supply system for key telephone set
ATE64050T1 (en) TELEPHONE EQUIPPED WITH A LINE VOLTAGE STABILIZER WITH DIRECT CURRENT FEEDING.
GB915354A (en) Circuits for the generation of servo system signals
FR2334258A1 (en) Control of remote electronic appts. - requires single DC source and one connection twin wire cable
GB989149A (en) Electrical delay line and method of making same
JPS5668029A (en) Digital-analog converter
FR2326091A1 (en) Telephone terminal telesupply unit - is connected to telephone line and can supply current from two sources
ATE3799T1 (en) CIRCUIT ARRANGEMENT FOR REMOTE FEED OF INTERMEDIATE STATIONS OF A COMMUNICATION TRANSMISSION TECHNOLOGY EQUIPMENT WITH MONITORING OF THE OUTPUT VOLTAGE OF AT LEAST ONE FEED STATION.
JPS61101161A (en) Holding tone transmitting device
JPS5735461A (en) Communication current supply circuit
SU610316A1 (en) Telegraphy input device
SU599358A1 (en) Contactless call-sending device

Legal Events

Date Code Title Description
ST Notification of lapse