DE3774300D1 - Weckschaltung. - Google Patents

Weckschaltung.

Info

Publication number
DE3774300D1
DE3774300D1 DE8787301987T DE3774300T DE3774300D1 DE 3774300 D1 DE3774300 D1 DE 3774300D1 DE 8787301987 T DE8787301987 T DE 8787301987T DE 3774300 T DE3774300 T DE 3774300T DE 3774300 D1 DE3774300 D1 DE 3774300D1
Authority
DE
Germany
Prior art keywords
wake
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 - Fee Related
Application number
DE8787301987T
Other languages
English (en)
Inventor
Michael Arthur Charles Robson
Peter Andrew Cross
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.)
GPT Ltd
Original Assignee
GPT Ltd
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 GPT Ltd filed Critical GPT Ltd
Application granted granted Critical
Publication of DE3774300D1 publication Critical patent/DE3774300D1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • H04M19/023—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone by reversing the polarity of the current at the exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Dc-Dc Converters (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
DE8787301987T 1986-03-12 1987-03-09 Weckschaltung. Expired - Fee Related DE3774300D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB868606151A GB8606151D0 (en) 1986-03-12 1986-03-12 Telephone system circuit

Publications (1)

Publication Number Publication Date
DE3774300D1 true DE3774300D1 (de) 1991-12-12

Family

ID=10594490

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8787301987T Expired - Fee Related DE3774300D1 (de) 1986-03-12 1987-03-09 Weckschaltung.

Country Status (10)

Country Link
US (1) US4737989A (de)
EP (1) EP0237303B1 (de)
CN (1) CN1006353B (de)
AU (1) AU587109B2 (de)
CA (1) CA1268872A (de)
DE (1) DE3774300D1 (de)
ES (1) ES2027290T3 (de)
GB (2) GB8606151D0 (de)
IN (1) IN167616B (de)
ZA (1) ZA871717B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1272318A (en) * 1986-10-20 1990-07-31 Kenji Takato Integrated ringing circuit and a ring trip circuit for the same
GB9026504D0 (en) * 1990-12-05 1991-01-23 Plessey Telecomm Telephone ringer circuit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904833A (en) * 1973-06-04 1975-09-09 Superior Continental Corp Ringing generator circuit with capacitor storage
IT1079588B (it) * 1977-02-14 1985-05-13 Sits Soc It Telecom Siemens Generatore di chiamata statico per sistemi di telecomunicazioni
US4354062A (en) * 1980-01-31 1982-10-12 Bell Telephone Laboratories, Incorporated Communication system signaling circuit
JPS5854773A (ja) * 1981-09-28 1983-03-31 Nec Corp 加入者回路
FR2535558A1 (fr) * 1982-10-27 1984-05-04 Trt Telecom Radio Electr Generateur de signal de sonnerie
CA1197641A (en) * 1983-08-26 1985-12-03 David E. Dodds Telephone line interface circuit
JPS60178760A (ja) * 1984-02-24 1985-09-12 Shindengen Electric Mfg Co Ltd 電話機用ベルの駆動用電源回路
US4656659A (en) * 1985-07-18 1987-04-07 Itt Corporation Programmable ring signal generator
CA1272318A (en) * 1986-10-20 1990-07-31 Kenji Takato Integrated ringing circuit and a ring trip circuit for the same

Also Published As

Publication number Publication date
US4737989A (en) 1988-04-12
GB8705703D0 (en) 1987-04-15
AU587109B2 (en) 1989-08-03
ZA871717B (en) 1987-08-31
EP0237303A1 (de) 1987-09-16
IN167616B (de) 1990-11-24
GB8606151D0 (en) 1986-04-16
CN1006353B (zh) 1990-01-03
GB2187915B (en) 1989-11-15
CN87101944A (zh) 1987-09-23
AU6992687A (en) 1987-09-17
GB2187915A (en) 1987-09-16
CA1268872A (en) 1990-05-08
EP0237303B1 (de) 1991-11-06
ES2027290T3 (es) 1992-06-01

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee