FR2391609A1 - Reseau telephonique a securite intrinseque - Google Patents

Reseau telephonique a securite intrinseque

Info

Publication number
FR2391609A1
FR2391609A1 FR7715444A FR7715444A FR2391609A1 FR 2391609 A1 FR2391609 A1 FR 2391609A1 FR 7715444 A FR7715444 A FR 7715444A FR 7715444 A FR7715444 A FR 7715444A FR 2391609 A1 FR2391609 A1 FR 2391609A1
Authority
FR
France
Prior art keywords
telephone network
telephone
intrinsic security
security telephone
network
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
FR7715444A
Other languages
English (en)
Other versions
FR2391609B1 (fr
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.)
SILEC DIVISION SIGNALISAT INDL
Original Assignee
SILEC DIVISION SIGNALISAT INDL
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 SILEC DIVISION SIGNALISAT INDL filed Critical SILEC DIVISION SIGNALISAT INDL
Priority to FR7715444A priority Critical patent/FR2391609A1/fr
Priority to US05/907,051 priority patent/US4214127A/en
Priority to IN618/CAL/78A priority patent/IN148868B/en
Publication of FR2391609A1 publication Critical patent/FR2391609A1/fr
Application granted granted Critical
Publication of FR2391609B1 publication Critical patent/FR2391609B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Alarm Systems (AREA)

Abstract

La présente invention concerne un réseau téléphonique à sécurité intrinsèque. Le poste téléphonique de ce réseau peut être placé en atmosphère dangereuse. Il comprend un microphone 1, un écouteur 2, un haut-parleur 3 et un amplificateur signaux de microphone 11 alimenté quand le combiné du poste téléphonique est décroché par des signaux continus disponibles entre les bornes A1 et B1 par lesquelles le poste est connecté à la ligne. Application aux téléphones de mines.
FR7715444A 1977-05-18 1977-05-18 Reseau telephonique a securite intrinseque Granted FR2391609A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7715444A FR2391609A1 (fr) 1977-05-18 1977-05-18 Reseau telephonique a securite intrinseque
US05/907,051 US4214127A (en) 1977-05-18 1978-05-17 Intrinsically safe telephone network
IN618/CAL/78A IN148868B (fr) 1977-05-18 1978-06-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7715444A FR2391609A1 (fr) 1977-05-18 1977-05-18 Reseau telephonique a securite intrinseque

Publications (2)

Publication Number Publication Date
FR2391609A1 true FR2391609A1 (fr) 1978-12-15
FR2391609B1 FR2391609B1 (fr) 1981-08-21

Family

ID=9191065

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7715444A Granted FR2391609A1 (fr) 1977-05-18 1977-05-18 Reseau telephonique a securite intrinseque

Country Status (3)

Country Link
US (1) US4214127A (fr)
FR (1) FR2391609A1 (fr)
IN (1) IN148868B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499337A (en) * 1981-08-11 1985-02-12 Danavox A/S Coupler for microtelephone set

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4747120A (en) * 1985-08-13 1988-05-24 Digital Products Corporation Automatic personnel monitoring system
US4741031A (en) * 1986-06-27 1988-04-26 Gai-Tronics Intrinsically safe telephone
US5023901A (en) * 1988-08-22 1991-06-11 Vorec Corporation Surveillance system having a voice verification unit
US5136630A (en) * 1990-07-13 1992-08-04 Gai-Tronics Intrinsically safe telephone
KR102179468B1 (ko) 2019-07-02 2020-11-16 한신전자 (주) 본질 안전 전화기

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1213004B (de) * 1959-09-30 1966-03-24 Siemens Ag Einrichtung zum eigensicheren Fernsprechen in explosionsgefaehrdeten Raeumen
GB928091A (en) * 1959-10-13 1963-06-06 Ass Elect Ind Loud-speaking telephone systems, particularly for use in mines
FR1406586A (fr) * 1964-06-09 1965-07-23 Electronique & Automatisme Sa Dispositif téléphonique à sécurité dite intrinsèque
US4064366A (en) * 1976-01-15 1977-12-20 Winster Engineering Group Limited Intrinsically safe telephone systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499337A (en) * 1981-08-11 1985-02-12 Danavox A/S Coupler for microtelephone set

Also Published As

Publication number Publication date
IN148868B (fr) 1981-07-04
US4214127A (en) 1980-07-22
FR2391609B1 (fr) 1981-08-21

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Legal Events

Date Code Title Description
ST Notification of lapse