ES411724A1 - Mejoras en los transmisores de impulsos electricos. - Google Patents

Mejoras en los transmisores de impulsos electricos.

Info

Publication number
ES411724A1
ES411724A1 ES411724A ES411724A ES411724A1 ES 411724 A1 ES411724 A1 ES 411724A1 ES 411724 A ES411724 A ES 411724A ES 411724 A ES411724 A ES 411724A ES 411724 A1 ES411724 A1 ES 411724A1
Authority
ES
Spain
Prior art keywords
telephone line
loop
telephone subscribers
electrical impulse
subscribers instruments
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
ES411724A
Other languages
English (en)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana 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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES411724A1 publication Critical patent/ES411724A1/es
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)
  • Devices For Supply Of Signal Current (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
ES411724A 1972-02-17 1973-02-17 Mejoras en los transmisores de impulsos electricos. Expired ES411724A1 (es)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
ES411724A1 true ES411724A1 (es) 1976-01-01

Family

ID=9830791

Family Applications (1)

Application Number Title Priority Date Filing Date
ES411724A Expired ES411724A1 (es) 1972-02-17 1973-02-17 Mejoras en los transmisores de impulsos electricos.

Country Status (4)

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

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
AT376089B (de) * 1978-09-20 1984-10-10 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
GB1347929A (en) 1974-02-27
FR2172190B1 (es) 1979-01-26
DE2307316A1 (de) 1973-08-23
FR2172190A1 (es) 1973-09-28

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