GB1386523A - Ringing trip circuit - Google Patents

Ringing trip circuit

Info

Publication number
GB1386523A
GB1386523A GB743273A GB743273A GB1386523A GB 1386523 A GB1386523 A GB 1386523A GB 743273 A GB743273 A GB 743273A GB 743273 A GB743273 A GB 743273A GB 1386523 A GB1386523 A GB 1386523A
Authority
GB
United Kingdom
Prior art keywords
oscillator
resistor
transistor
feb
subscriber
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
GB743273A
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.)
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 GB1386523A publication Critical patent/GB1386523A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
GB743273A 1972-02-17 1973-02-15 Ringing trip circuit Expired GB1386523A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7205290A FR2172537A5 (enExample) 1972-02-17 1972-02-17

Publications (1)

Publication Number Publication Date
GB1386523A true GB1386523A (en) 1975-03-05

Family

ID=9093631

Family Applications (1)

Application Number Title Priority Date Filing Date
GB743273A Expired GB1386523A (en) 1972-02-17 1973-02-15 Ringing trip circuit

Country Status (10)

Country Link
US (1) US3835258A (enExample)
AR (1) AR195702A1 (enExample)
BR (1) BR7301219D0 (enExample)
CA (1) CA971689A (enExample)
CH (1) CH562539A5 (enExample)
DE (1) DE2307317A1 (enExample)
ES (1) ES411687A1 (enExample)
FR (1) FR2172537A5 (enExample)
GB (1) GB1386523A (enExample)
IT (1) IT979129B (enExample)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7512060L (sv) * 1974-11-07 1976-05-10 Western Electric Co Anordning for att i en telekommunikationsanleggning patrycka och detektera ringsignaler over en anropad linje
US4447673A (en) * 1977-12-27 1984-05-08 Stromberg-Carlson Corporation Ring trip apparatus for a line circuit connected to DCO switch
ES244069Y (es) * 1979-06-21 1980-04-01 Circuito detector de corriente.
US4447675A (en) * 1982-10-29 1984-05-08 Bell Telephone Laboratories, Incorporated Ring-trip detector
DE3473803D1 (en) * 1984-06-20 1988-10-06 Ibm Detection circuit for current varations

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312787A (en) * 1963-10-17 1967-04-04 Stromberg Carlson Corp Signaling system
DE1288626B (de) * 1966-05-28 1969-02-06 Nippon Electric Co Automatische Geraeteabschaltanordnung fuer einen Fernempfaenger
BE756517A (fr) * 1969-09-23 1971-03-01 Ericsson Telefon Ab L M Interrupteur pour signaux d'appel de centraux telephoniques automatiques
US3641552A (en) * 1970-02-18 1972-02-08 Int Assemblix Corp Centrally located access alarm system

Also Published As

Publication number Publication date
BR7301219D0 (pt) 1974-02-19
CH562539A5 (enExample) 1975-05-30
FR2172537A5 (enExample) 1973-09-28
IT979129B (it) 1974-09-30
US3835258A (en) 1974-09-10
AR195702A1 (es) 1973-10-31
ES411687A1 (es) 1976-01-01
DE2307317A1 (de) 1973-08-30
CA971689A (en) 1975-07-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee