IN167616B - - Google Patents

Info

Publication number
IN167616B
IN167616B IN204/DEL/87A IN204DE1987A IN167616B IN 167616 B IN167616 B IN 167616B IN 204DE1987 A IN204DE1987 A IN 204DE1987A IN 167616 B IN167616 B IN 167616B
Authority
IN
India
Application number
IN204/DEL/87A
Other languages
English (en)
Inventor
Michael Arthur Robson
Peter Andrew Cross
Original Assignee
Plessey Telecomm
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 Plessey Telecomm filed Critical Plessey Telecomm
Publication of IN167616B publication Critical patent/IN167616B/en

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)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
IN204/DEL/87A 1986-03-12 1987-03-06 IN167616B (ja)

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
IN167616B true IN167616B (ja) 1990-11-24

Family

ID=10594490

Family Applications (1)

Application Number Title Priority Date Filing Date
IN204/DEL/87A IN167616B (ja) 1986-03-12 1987-03-06

Country Status (10)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU593951B2 (en) * 1986-10-20 1990-02-22 Fujitsu Limited An 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
AU593951B2 (en) * 1986-10-20 1990-02-22 Fujitsu Limited An integrated ringing circuit and a ring trip circuit for the same

Also Published As

Publication number Publication date
US4737989A (en) 1988-04-12
AU587109B2 (en) 1989-08-03
GB2187915B (en) 1989-11-15
GB2187915A (en) 1987-09-16
AU6992687A (en) 1987-09-17
ZA871717B (en) 1987-08-31
GB8705703D0 (en) 1987-04-15
EP0237303B1 (en) 1991-11-06
CA1268872A (en) 1990-05-08
ES2027290T3 (es) 1992-06-01
DE3774300D1 (de) 1991-12-12
GB8606151D0 (en) 1986-04-16
CN87101944A (zh) 1987-09-23
EP0237303A1 (en) 1987-09-16
CN1006353B (zh) 1990-01-03

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