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
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)
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 (ko) | 1990-11-24 |
Family
ID=10594490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IN204/DEL/87A IN167616B (ko) | 1986-03-12 | 1987-03-06 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4737989A (ko) |
| EP (1) | EP0237303B1 (ko) |
| CN (1) | CN1006353B (ko) |
| AU (1) | AU587109B2 (ko) |
| CA (1) | CA1268872A (ko) |
| DE (1) | DE3774300D1 (ko) |
| ES (1) | ES2027290T3 (ko) |
| GB (2) | GB8606151D0 (ko) |
| IN (1) | IN167616B (ko) |
| ZA (1) | ZA871717B (ko) |
Families Citing this family (2)
| 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)
| 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 |
-
1986
- 1986-03-12 GB GB868606151A patent/GB8606151D0/en active Pending
-
1987
- 1987-03-06 IN IN204/DEL/87A patent/IN167616B/en unknown
- 1987-03-09 DE DE8787301987T patent/DE3774300D1/de not_active Expired - Fee Related
- 1987-03-09 ES ES198787301987T patent/ES2027290T3/es not_active Expired - Lifetime
- 1987-03-09 EP EP87301987A patent/EP0237303B1/en not_active Expired - Lifetime
- 1987-03-10 ZA ZA871717A patent/ZA871717B/xx unknown
- 1987-03-10 US US07/024,001 patent/US4737989A/en not_active Expired - Fee Related
- 1987-03-11 CA CA000531679A patent/CA1268872A/en not_active Expired - Fee Related
- 1987-03-11 GB GB8705703A patent/GB2187915B/en not_active Expired
- 1987-03-11 AU AU69926/87A patent/AU587109B2/en not_active Ceased
- 1987-03-12 CN CN87101944A patent/CN1006353B/zh not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2187915A (en) | 1987-09-16 |
| EP0237303B1 (en) | 1991-11-06 |
| EP0237303A1 (en) | 1987-09-16 |
| ES2027290T3 (es) | 1992-06-01 |
| AU6992687A (en) | 1987-09-17 |
| ZA871717B (en) | 1987-08-31 |
| AU587109B2 (en) | 1989-08-03 |
| CA1268872A (en) | 1990-05-08 |
| GB8705703D0 (en) | 1987-04-15 |
| GB2187915B (en) | 1989-11-15 |
| US4737989A (en) | 1988-04-12 |
| CN87101944A (zh) | 1987-09-23 |
| DE3774300D1 (de) | 1991-12-12 |
| CN1006353B (zh) | 1990-01-03 |
| GB8606151D0 (en) | 1986-04-16 |