FR2415405A1 - Circuit connecting subscriber line to telephone exchange - has balanced amplifier whose input is connected to one or other of two supply points (BE 17.4.79) - Google Patents

Circuit connecting subscriber line to telephone exchange - has balanced amplifier whose input is connected to one or other of two supply points (BE 17.4.79)

Info

Publication number
FR2415405A1
FR2415405A1 FR7801461A FR7801461A FR2415405A1 FR 2415405 A1 FR2415405 A1 FR 2415405A1 FR 7801461 A FR7801461 A FR 7801461A FR 7801461 A FR7801461 A FR 7801461A FR 2415405 A1 FR2415405 A1 FR 2415405A1
Authority
FR
France
Prior art keywords
subscriber line
whose input
supply points
balanced amplifier
telephone exchange
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
FR7801461A
Other languages
French (fr)
Other versions
FR2415405B1 (en
Inventor
Gilbert Marie Marcel Ferrieu
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.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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 Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Priority to FR7801461A priority Critical patent/FR2415405A1/en
Priority to US05/949,715 priority patent/US4211896A/en
Priority to CA000313083A priority patent/CA1119330A/en
Priority to DE2844492A priority patent/DE2844492C3/en
Priority to GB7840410A priority patent/GB2007463B/en
Priority to CH1068178A priority patent/CH636990A5/en
Priority to SE7810700A priority patent/SE437453B/en
Priority to NLAANVRAGE7810301,A priority patent/NL186426C/en
Priority to JP12691878A priority patent/JPS5465406A/en
Publication of FR2415405A1 publication Critical patent/FR2415405A1/en
Application granted granted Critical
Publication of FR2415405B1 publication Critical patent/FR2415405B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

The circuit has a balanced amplifier between two supply points at different potentials. It has two inputs and two outputs, the latter connected to the two wires of the subscriber line. Each input terminals of the amplifier is connected to an output of a digital-analogue converter, whose input is connected through a switch to the one or the other supply point. The switch is controlled by a binary digital signal which characterises the voltage required for the subscriber line, and is collected from digital signal generator under exchange control.
FR7801461A 1977-10-17 1978-01-19 Circuit connecting subscriber line to telephone exchange - has balanced amplifier whose input is connected to one or other of two supply points (BE 17.4.79) Granted FR2415405A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
FR7801461A FR2415405A1 (en) 1978-01-19 1978-01-19 Circuit connecting subscriber line to telephone exchange - has balanced amplifier whose input is connected to one or other of two supply points (BE 17.4.79)
US05/949,715 US4211896A (en) 1977-10-17 1978-10-10 Subscriber's circuit with a symmetrical amplifier
CA000313083A CA1119330A (en) 1977-10-17 1978-10-11 Subscriber's circuit
DE2844492A DE2844492C3 (en) 1977-10-17 1978-10-12 Subscriber circuit
GB7840410A GB2007463B (en) 1977-10-17 1978-10-13 Telephone subscriber's line circuit
CH1068178A CH636990A5 (en) 1977-10-17 1978-10-13 PARTICIPATING CIRCUIT.
SE7810700A SE437453B (en) 1977-10-17 1978-10-13 SUBSCRIBER CIRCUIT
NLAANVRAGE7810301,A NL186426C (en) 1977-10-17 1978-10-13 SUBSCRIPTION CIRCUIT.
JP12691878A JPS5465406A (en) 1977-10-17 1978-10-17 Subscriber*s circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7801461A FR2415405A1 (en) 1978-01-19 1978-01-19 Circuit connecting subscriber line to telephone exchange - has balanced amplifier whose input is connected to one or other of two supply points (BE 17.4.79)

Publications (2)

Publication Number Publication Date
FR2415405A1 true FR2415405A1 (en) 1979-08-17
FR2415405B1 FR2415405B1 (en) 1982-01-15

Family

ID=9203637

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7801461A Granted FR2415405A1 (en) 1977-10-17 1978-01-19 Circuit connecting subscriber line to telephone exchange - has balanced amplifier whose input is connected to one or other of two supply points (BE 17.4.79)

Country Status (1)

Country Link
FR (1) FR2415405A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029823A1 (en) * 1979-06-25 1981-06-03 Telecommunications Radioelectriques Et Telephoniques T.R.T. Current weighting circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2148869A5 (en) * 1971-08-06 1973-03-23 Trt Telecom Radio Electr
DE2627140A1 (en) * 1975-06-18 1977-01-13 Hitachi Ltd SUBSCRIBER CIRCUIT FOR FOUR-WIRE CONNECTION

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2148869A5 (en) * 1971-08-06 1973-03-23 Trt Telecom Radio Electr
DE2627140A1 (en) * 1975-06-18 1977-01-13 Hitachi Ltd SUBSCRIBER CIRCUIT FOR FOUR-WIRE CONNECTION

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NO010226/76 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029823A1 (en) * 1979-06-25 1981-06-03 Telecommunications Radioelectriques Et Telephoniques T.R.T. Current weighting circuit

Also Published As

Publication number Publication date
FR2415405B1 (en) 1982-01-15

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Legal Events

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