FR2299774A1 - Dispositif de visualisation d'un appel telephonique et de l'occupation d'une ligne telephonique - Google Patents

Dispositif de visualisation d'un appel telephonique et de l'occupation d'une ligne telephonique

Info

Publication number
FR2299774A1
FR2299774A1 FR7502603A FR7502603A FR2299774A1 FR 2299774 A1 FR2299774 A1 FR 2299774A1 FR 7502603 A FR7502603 A FR 7502603A FR 7502603 A FR7502603 A FR 7502603A FR 2299774 A1 FR2299774 A1 FR 2299774A1
Authority
FR
France
Prior art keywords
visual display
line state
call signals
telephone exchanges
electroluminescent diodes
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
FR7502603A
Other languages
English (en)
French (fr)
Other versions
FR2299774B1 (pt
Inventor
Jean Picandet
Francois Boullier
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.)
Jeumont Schneider SA
Original Assignee
Jeumont Schneider 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 Jeumont Schneider SA filed Critical Jeumont Schneider SA
Priority to FR7502603A priority Critical patent/FR2299774A1/fr
Publication of FR2299774A1 publication Critical patent/FR2299774A1/fr
Application granted granted Critical
Publication of FR2299774B1 publication Critical patent/FR2299774B1/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
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
FR7502603A 1975-01-28 1975-01-28 Dispositif de visualisation d'un appel telephonique et de l'occupation d'une ligne telephonique Granted FR2299774A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7502603A FR2299774A1 (fr) 1975-01-28 1975-01-28 Dispositif de visualisation d'un appel telephonique et de l'occupation d'une ligne telephonique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7502603A FR2299774A1 (fr) 1975-01-28 1975-01-28 Dispositif de visualisation d'un appel telephonique et de l'occupation d'une ligne telephonique

Publications (2)

Publication Number Publication Date
FR2299774A1 true FR2299774A1 (fr) 1976-08-27
FR2299774B1 FR2299774B1 (pt) 1978-07-13

Family

ID=9150402

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7502603A Granted FR2299774A1 (fr) 1975-01-28 1975-01-28 Dispositif de visualisation d'un appel telephonique et de l'occupation d'une ligne telephonique

Country Status (1)

Country Link
FR (1) FR2299774A1 (pt)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1036965A (fr) * 1951-05-10 1953-09-14 Dispositif servant à alimenter des feux de signalisation par inversion de polarité
GB1167438A (en) * 1966-09-06 1969-10-15 Siemens Ag A Polyphase Induction-type Electricity Meter
US3725601A (en) * 1971-03-05 1973-04-03 Bell Telephone Labor Inc Direct station selection private intercom exchange system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1036965A (fr) * 1951-05-10 1953-09-14 Dispositif servant à alimenter des feux de signalisation par inversion de polarité
GB1167438A (en) * 1966-09-06 1969-10-15 Siemens Ag A Polyphase Induction-type Electricity Meter
US3725601A (en) * 1971-03-05 1973-04-03 Bell Telephone Labor Inc Direct station selection private intercom exchange system

Also Published As

Publication number Publication date
FR2299774B1 (pt) 1978-07-13

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Legal Events

Date Code Title Description
ST Notification of lapse