FR2172190B1 - - Google Patents

Info

Publication number
FR2172190B1
FR2172190B1 FR7305085A FR7305085A FR2172190B1 FR 2172190 B1 FR2172190 B1 FR 2172190B1 FR 7305085 A FR7305085 A FR 7305085A FR 7305085 A FR7305085 A FR 7305085A FR 2172190 B1 FR2172190 B1 FR 2172190B1
Authority
FR
France
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
FR7305085A
Other languages
French (fr)
Other versions
FR2172190A1 (de
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of FR2172190A1 publication Critical patent/FR2172190A1/fr
Application granted granted Critical
Publication of FR2172190B1 publication Critical patent/FR2172190B1/fr
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
    • H04M1/26—Devices for calling a subscriber
    • 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)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Devices For Supply Of Signal Current (AREA)
FR7305085A 1972-02-17 1973-02-08 Expired FR2172190B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB731572 1972-02-17

Publications (2)

Publication Number Publication Date
FR2172190A1 FR2172190A1 (de) 1973-09-28
FR2172190B1 true FR2172190B1 (de) 1979-01-26

Family

ID=9830791

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7305085A Expired FR2172190B1 (de) 1972-02-17 1973-02-08

Country Status (4)

Country Link
DE (1) DE2307316A1 (de)
ES (1) ES411724A1 (de)
FR (1) FR2172190B1 (de)
GB (1) GB1347929A (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453730A1 (de) 1972-08-03 1976-05-20 Itt Ind Gmbh Deutsche Verfahren und schaltungsanordnung zum ueberspannungsschutz von transistoren von betriebsschaltungen eines telefonapparates
DE2462048C2 (de) * 1974-03-09 1984-07-12 Deutsche Itt Industries Gmbh, 7800 Freiburg Schaltungsanordnung für einen Telefonapparat mit Wahltastatur
FR2319256A1 (fr) * 1975-07-23 1977-02-18 Bailleul Roland Circuits electroniques et electromagnetiques permettant l'adaptation d'un clavier numerique a un poste telephonique a cadran d'appel par quatre fils
DE2536201C2 (de) * 1975-08-13 1982-06-03 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung für Fernmeldeanlagen insbesondere für Fernsprechapparate zur Abgabe von Wählimpulsen mit einem Transistor
DE2848986C3 (de) * 1976-09-15 1981-10-08 Krone Gmbh, 1000 Berlin Schaltungsanordnung für einen Fernsprechapparat mit Wähltastatur nach dem Impulswahl-Verfahren
ATA677778A (de) * 1978-09-20 1984-02-15 Siemens Ag Oesterreich Schaltung fuer fernmelde-, insbesondere fernsprech-teilnehmerstellen, sowie uebertragungen mit impulsgebender wahlsteuerung
GB2132447B (en) * 1982-12-04 1986-07-30 Standard Telephones Cables Ltd Switch device

Also Published As

Publication number Publication date
DE2307316A1 (de) 1973-08-23
FR2172190A1 (de) 1973-09-28
GB1347929A (en) 1974-02-27
ES411724A1 (es) 1976-01-01

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Legal Events

Date Code Title Description
ST Notification of lapse