GB1347929A - Telephone subscribers instruments - Google Patents

Telephone subscribers instruments

Info

Publication number
GB1347929A
GB1347929A GB1347929DA GB1347929A GB 1347929 A GB1347929 A GB 1347929A GB 1347929D A GB1347929D A GB 1347929DA GB 1347929 A GB1347929 A GB 1347929A
Authority
GB
United Kingdom
Prior art keywords
transistor
line
impulse
transistors
pulse waveform
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
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB1347929A publication Critical patent/GB1347929A/en
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)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
GB1347929D 1972-02-17 1972-02-17 Telephone subscribers instruments Expired GB1347929A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1347929A true GB1347929A (en) 1974-02-27

Family

ID=9830791

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1347929D Expired GB1347929A (en) 1972-02-17 1972-02-17 Telephone subscribers instruments

Country Status (4)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132447A (en) * 1982-12-04 1984-07-04 Standard Telephones Cables Ltd Switch device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132447A (en) * 1982-12-04 1984-07-04 Standard Telephones Cables Ltd Switch device

Also Published As

Publication number Publication date
FR2172190B1 (enrdf_load_stackoverflow) 1979-01-26
FR2172190A1 (enrdf_load_stackoverflow) 1973-09-28
ES411724A1 (es) 1976-01-01
DE2307316A1 (de) 1973-08-23

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee