FR2406357A1 - 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
FR2406357A1
FR2406357A1 FR7731145A FR7731145A FR2406357A1 FR 2406357 A1 FR2406357 A1 FR 2406357A1 FR 7731145 A FR7731145 A FR 7731145A FR 7731145 A FR7731145 A FR 7731145A FR 2406357 A1 FR2406357 A1 FR 2406357A1
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
FR7731145A
Other languages
French (fr)
Other versions
FR2406357B1 (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 FR7731145A priority Critical patent/FR2406357A1/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 NLAANVRAGE7810301,A priority patent/NL186426C/en
Priority to GB7840410A priority patent/GB2007463B/en
Priority to SE7810700A priority patent/SE437453B/en
Priority to CH1068178A priority patent/CH636990A5/en
Priority to BE191151A priority patent/BE871299A/en
Priority to AU40755/78A priority patent/AU518635B2/en
Priority to JP12691878A priority patent/JPS5465406A/en
Publication of FR2406357A1 publication Critical patent/FR2406357A1/en
Application granted granted Critical
Publication of FR2406357B1 publication Critical patent/FR2406357B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • H04M19/023—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone by reversing the polarity of the current at the exchange
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

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.
FR7731145A 1977-10-17 1977-10-17 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 FR2406357A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
FR7731145A FR2406357A1 (en) 1977-10-17 1977-10-17 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
SE7810700A SE437453B (en) 1977-10-17 1978-10-13 SUBSCRIBER CIRCUIT
NLAANVRAGE7810301,A NL186426C (en) 1977-10-17 1978-10-13 SUBSCRIPTION CIRCUIT.
CH1068178A CH636990A5 (en) 1977-10-17 1978-10-13 PARTICIPATING CIRCUIT.
BE191151A BE871299A (en) 1977-10-17 1978-10-16 SUBSCRIBE
AU40755/78A AU518635B2 (en) 1977-10-17 1978-10-16 Subscriber circuit with symmetrical amplifier
JP12691878A JPS5465406A (en) 1977-10-17 1978-10-17 Subscriber*s circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7731145A FR2406357A1 (en) 1977-10-17 1977-10-17 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
FR2406357A1 true FR2406357A1 (en) 1979-05-11
FR2406357B1 FR2406357B1 (en) 1980-04-04

Family

ID=9196577

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7731145A Granted FR2406357A1 (en) 1977-10-17 1977-10-17 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 (3)

Country Link
AU (1) AU518635B2 (en)
BE (1) BE871299A (en)
FR (1) FR2406357A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2456431A1 (en) * 1979-05-10 1980-12-05 Philips Nv AMPLIFIER FOR USE IN A SUBSCRIBER LINE CIRCUIT
EP0029823A1 (en) * 1979-06-25 1981-06-03 Telecommunications Radioelectriques Et Telephoniques T.R.T. Current weighting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2456431A1 (en) * 1979-05-10 1980-12-05 Philips Nv AMPLIFIER FOR USE IN A SUBSCRIBER LINE CIRCUIT
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
FR2406357B1 (en) 1980-04-04
AU4075578A (en) 1980-04-24
AU518635B2 (en) 1981-10-08
BE871299A (en) 1979-04-17

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Legal Events

Date Code Title Description
TP Transmission of property
TP Transmission of property
TP Transmission of property