FR2446519A1 - Systeme de signalisation sur ligne de raccordement d'utilisation d'un reseau telephonique et reseau telephonique comportant de tels systemes - Google Patents

Systeme de signalisation sur ligne de raccordement d'utilisation d'un reseau telephonique et reseau telephonique comportant de tels systemes

Info

Publication number
FR2446519A1
FR2446519A1 FR7900635A FR7900635A FR2446519A1 FR 2446519 A1 FR2446519 A1 FR 2446519A1 FR 7900635 A FR7900635 A FR 7900635A FR 7900635 A FR7900635 A FR 7900635A FR 2446519 A1 FR2446519 A1 FR 2446519A1
Authority
FR
France
Prior art keywords
line
switch
loudspeaker
fed
oscillator
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
FR7900635A
Other languages
English (en)
French (fr)
Other versions
FR2446519B1 (US06811534-20041102-M00003.png
Inventor
Henri Butin
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.)
Thales SA
Original Assignee
Thomson CSF 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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7900635A priority Critical patent/FR2446519A1/fr
Publication of FR2446519A1 publication Critical patent/FR2446519A1/fr
Application granted granted Critical
Publication of FR2446519B1 publication Critical patent/FR2446519B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
FR7900635A 1979-01-11 1979-01-11 Systeme de signalisation sur ligne de raccordement d'utilisation d'un reseau telephonique et reseau telephonique comportant de tels systemes Granted FR2446519A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7900635A FR2446519A1 (fr) 1979-01-11 1979-01-11 Systeme de signalisation sur ligne de raccordement d'utilisation d'un reseau telephonique et reseau telephonique comportant de tels systemes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7900635A FR2446519A1 (fr) 1979-01-11 1979-01-11 Systeme de signalisation sur ligne de raccordement d'utilisation d'un reseau telephonique et reseau telephonique comportant de tels systemes

Publications (2)

Publication Number Publication Date
FR2446519A1 true FR2446519A1 (fr) 1980-08-08
FR2446519B1 FR2446519B1 (US06811534-20041102-M00003.png) 1982-02-05

Family

ID=9220633

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7900635A Granted FR2446519A1 (fr) 1979-01-11 1979-01-11 Systeme de signalisation sur ligne de raccordement d'utilisation d'un reseau telephonique et reseau telephonique comportant de tels systemes

Country Status (1)

Country Link
FR (1) FR2446519A1 (US06811534-20041102-M00003.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499737A1 (fr) * 1981-02-12 1982-08-13 Laudren Cie Sa Ets M Circuit d'alarme pour systemes de surveillance de postes telephoniques publics a prepaiement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2911474A (en) * 1957-11-01 1959-11-03 Bell Telephone Labor Inc Telephone alarm system
FR1559686A (US06811534-20041102-M00003.png) * 1966-12-12 1969-03-14
US3789382A (en) * 1972-08-11 1974-01-29 Centralalarm Int Inc Alarm system with central station monitoring of key operated locks of a number of remote stations
DE2424588A1 (de) * 1974-05-21 1975-12-04 Merk Gmbh Telefonbau Fried Alarmmelder mit einem frequenzgenerator
DE2722377A1 (de) * 1977-05-17 1978-11-30 Siemens Ag Schaltungsanordnung fuer fernmelde-, insbesondere fernsprechvermittlungsanlagen, mit ausnutzung wenigstens einer teilnehmerstelle als alarmgeber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2911474A (en) * 1957-11-01 1959-11-03 Bell Telephone Labor Inc Telephone alarm system
FR1559686A (US06811534-20041102-M00003.png) * 1966-12-12 1969-03-14
US3789382A (en) * 1972-08-11 1974-01-29 Centralalarm Int Inc Alarm system with central station monitoring of key operated locks of a number of remote stations
DE2424588A1 (de) * 1974-05-21 1975-12-04 Merk Gmbh Telefonbau Fried Alarmmelder mit einem frequenzgenerator
DE2722377A1 (de) * 1977-05-17 1978-11-30 Siemens Ag Schaltungsanordnung fuer fernmelde-, insbesondere fernsprechvermittlungsanlagen, mit ausnutzung wenigstens einer teilnehmerstelle als alarmgeber

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499737A1 (fr) * 1981-02-12 1982-08-13 Laudren Cie Sa Ets M Circuit d'alarme pour systemes de surveillance de postes telephoniques publics a prepaiement
EP0058600A1 (fr) * 1981-02-12 1982-08-25 Etablissements M. LAUDREN & Compagnie S.A. Circuit d'alarme pour système de surveillance de postes téléphoniques publics à prépaiement

Also Published As

Publication number Publication date
FR2446519B1 (US06811534-20041102-M00003.png) 1982-02-05

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Legal Events

Date Code Title Description
ST Notification of lapse