FR2368845A1 - Call unit for telephone equipment - has loop detector and logic circuit to excite telephone equipment call signal generator - Google Patents

Call unit for telephone equipment - has loop detector and logic circuit to excite telephone equipment call signal generator

Info

Publication number
FR2368845A1
FR2368845A1 FR7631428A FR7631428A FR2368845A1 FR 2368845 A1 FR2368845 A1 FR 2368845A1 FR 7631428 A FR7631428 A FR 7631428A FR 7631428 A FR7631428 A FR 7631428A FR 2368845 A1 FR2368845 A1 FR 2368845A1
Authority
FR
France
Prior art keywords
telephone equipment
signal generator
unit
call
excite
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
FR7631428A
Other languages
French (fr)
Other versions
FR2368845B1 (en
Inventor
Andre Chataignon
Bernard Gilles
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to FR7631428A priority Critical patent/FR2368845A1/en
Publication of FR2368845A1 publication Critical patent/FR2368845A1/en
Application granted granted Critical
Publication of FR2368845B1 publication Critical patent/FR2368845B1/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
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

A call unit for telephone is used with electronic exchanges which generate high frequency low energy signals for tone calls. The unit is part of a line unit connected to a telephone by two lines, and to a telephone network, to a control unit and to a call signal generator. The unit has a loop detector circuit comprising a comparator to detect the open or closed condition of the lines. It also has a circuit with transistors to excite the call signal generator. A logic circuit with a gate is used to control the transistor circuit.
FR7631428A 1976-10-19 1976-10-19 Call unit for telephone equipment - has loop detector and logic circuit to excite telephone equipment call signal generator Granted FR2368845A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7631428A FR2368845A1 (en) 1976-10-19 1976-10-19 Call unit for telephone equipment - has loop detector and logic circuit to excite telephone equipment call signal generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7631428A FR2368845A1 (en) 1976-10-19 1976-10-19 Call unit for telephone equipment - has loop detector and logic circuit to excite telephone equipment call signal generator

Publications (2)

Publication Number Publication Date
FR2368845A1 true FR2368845A1 (en) 1978-05-19
FR2368845B1 FR2368845B1 (en) 1981-05-29

Family

ID=9178935

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7631428A Granted FR2368845A1 (en) 1976-10-19 1976-10-19 Call unit for telephone equipment - has loop detector and logic circuit to excite telephone equipment call signal generator

Country Status (1)

Country Link
FR (1) FR2368845A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2437121A1 (en) * 1978-09-19 1980-04-18 Thomson Ericsson Telephones So NEW RINGER INJECTION DEVICE IN TELEPHONE SETS
EP0016672A1 (en) * 1979-03-12 1980-10-01 JEUMONT-SCHNEIDER Société anonyme dite: Call device for an automatic subscriber telephone installation with extensions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2437121A1 (en) * 1978-09-19 1980-04-18 Thomson Ericsson Telephones So NEW RINGER INJECTION DEVICE IN TELEPHONE SETS
EP0016672A1 (en) * 1979-03-12 1980-10-01 JEUMONT-SCHNEIDER Société anonyme dite: Call device for an automatic subscriber telephone installation with extensions
FR2451682A1 (en) * 1979-03-12 1980-10-10 Jeumont Schneider CALL DEVICE FOR AUTOMATIC SUBSCRIBER TELEPHONE INSTALLATION WITH ADDITIONAL STATIONS

Also Published As

Publication number Publication date
FR2368845B1 (en) 1981-05-29

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