DE3563583D1 - Telephonic keyboard protected against overload - Google Patents

Telephonic keyboard protected against overload

Info

Publication number
DE3563583D1
DE3563583D1 DE8585420004T DE3563583T DE3563583D1 DE 3563583 D1 DE3563583 D1 DE 3563583D1 DE 8585420004 T DE8585420004 T DE 8585420004T DE 3563583 T DE3563583 T DE 3563583T DE 3563583 D1 DE3563583 D1 DE 3563583D1
Authority
DE
Germany
Prior art keywords
transistor
generating means
supply
generating
resistor
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.)
Expired
Application number
DE8585420004T
Other languages
English (en)
Inventor
Jean Montenot
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.)
Horlogerie Photographique Francaise SA
Original Assignee
Horlogerie Photographique Francaise 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 Horlogerie Photographique Francaise SA filed Critical Horlogerie Photographique Francaise SA
Application granted granted Critical
Publication of DE3563583D1 publication Critical patent/DE3563583D1/de
Expired 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
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745—Protection devices or circuits for voltages surges on the line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Telephone Function (AREA)
  • Glass Compositions (AREA)
  • Saccharide Compounds (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Materials For Medical Uses (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Luminescent Compositions (AREA)
  • Devices For Supply Of Signal Current (AREA)
DE8585420004T 1984-01-11 1985-01-10 Telephonic keyboard protected against overload Expired DE3563583D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8401071A FR2558024B1 (fr) 1984-01-11 1984-01-11 Clavier de numerotation telephonique protege contre les surcharges

Publications (1)

Publication Number Publication Date
DE3563583D1 true DE3563583D1 (en) 1988-08-04

Family

ID=9300420

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8585420004T Expired DE3563583D1 (en) 1984-01-11 1985-01-10 Telephonic keyboard protected against overload

Country Status (4)

Country Link
EP (1) EP0148808B1 (de)
AT (1) ATE35492T1 (de)
DE (1) DE3563583D1 (de)
FR (1) FR2558024B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008064357A1 (de) * 2008-12-20 2010-06-24 Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg Optisch aktive Verglasung mit Überspannungsschutz

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1202931B (it) * 1979-06-05 1989-02-15 Sits Soc It Telecom Siemens Circuito di interfaccia per tastiera elettronica con ripetizione della selezione
FR2504323B1 (fr) * 1981-04-16 1985-10-31 Radiotechnique Compelec Poste telephonique d'abonne muni d'un dispositif de protection contre les surtensions

Also Published As

Publication number Publication date
ATE35492T1 (de) 1988-07-15
EP0148808A3 (en) 1985-08-28
EP0148808A2 (de) 1985-07-17
FR2558024B1 (fr) 1986-05-16
EP0148808B1 (de) 1988-06-29
FR2558024A1 (fr) 1985-07-12

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee