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GB814141A - Improvements in or relating to telephone ringing equipment - Google Patents

Improvements in or relating to telephone ringing equipment

Info

Publication number
GB814141A
GB814141A GB19415/56A GB1941556A GB814141A GB 814141 A GB814141 A GB 814141A GB 19415/56 A GB19415/56 A GB 19415/56A GB 1941556 A GB1941556 A GB 1941556A GB 814141 A GB814141 A GB 814141A
Authority
GB
United Kingdom
Prior art keywords
circuit
bell
frequency
transistor
transistors
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
GB19415/56A
Other languages
English (en)
Inventor
Hugh Spence Leman
George John Preston Barnes
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
Priority to BE563265D priority Critical patent/BE563265A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB19415/56A priority patent/GB814141A/en
Priority to DEI13384A priority patent/DE1200381B/de
Publication of GB814141A publication Critical patent/GB814141A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
GB19415/56A 1956-06-22 1956-06-22 Improvements in or relating to telephone ringing equipment Expired GB814141A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE563265D BE563265A (uk) 1956-06-22
GB19415/56A GB814141A (en) 1956-06-22 1956-06-22 Improvements in or relating to telephone ringing equipment
DEI13384A DE1200381B (de) 1956-06-22 1957-06-22 Schaltungsanordnung zum Rufempfang an Teilnehmerstationen in Fernsprechanlagen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19415/56A GB814141A (en) 1956-06-22 1956-06-22 Improvements in or relating to telephone ringing equipment

Publications (1)

Publication Number Publication Date
GB814141A true GB814141A (en) 1959-05-27

Family

ID=10128972

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19415/56A Expired GB814141A (en) 1956-06-22 1956-06-22 Improvements in or relating to telephone ringing equipment

Country Status (3)

Country Link
BE (1) BE563265A (uk)
DE (1) DE1200381B (uk)
GB (1) GB814141A (uk)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1142637B (de) * 1959-05-28 1963-01-24 Ass Elect Ind Schaltungsanordnung zum Ausloesen eines tonfrequenten Rufes an Fernsprechteilnehmerstellen
DE1147990B (de) * 1959-12-16 1963-05-02 Siemens Ag Schaltungsanordnung zum Empfang tonfrequenter Rufstroeme
DE1174374B (de) * 1960-07-21 1964-07-23 Int Standard Electric Corp Tonfrequentes Signalverfahren fuer Fernsprech-Teilnehmerstellen und Schaltungsanordnung zur Durchfuehrung des Verfahrens

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE935554C (de) * 1953-06-03 1955-11-24 Automatic Elect Lab Selektive Rufschaltanordnung, insbesondere fuer Teilnehmerstellen in Fernsprechanlagen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1142637B (de) * 1959-05-28 1963-01-24 Ass Elect Ind Schaltungsanordnung zum Ausloesen eines tonfrequenten Rufes an Fernsprechteilnehmerstellen
DE1147990B (de) * 1959-12-16 1963-05-02 Siemens Ag Schaltungsanordnung zum Empfang tonfrequenter Rufstroeme
DE1174374B (de) * 1960-07-21 1964-07-23 Int Standard Electric Corp Tonfrequentes Signalverfahren fuer Fernsprech-Teilnehmerstellen und Schaltungsanordnung zur Durchfuehrung des Verfahrens

Also Published As

Publication number Publication date
BE563265A (uk)
DE1200381B (de) 1965-09-09

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