IT1121333B - Circuito di comando della corrente dei doppini di utenti telefonici - Google Patents
Circuito di comando della corrente dei doppini di utenti telefoniciInfo
- Publication number
- IT1121333B IT1121333B IT23377/79A IT2337779A IT1121333B IT 1121333 B IT1121333 B IT 1121333B IT 23377/79 A IT23377/79 A IT 23377/79A IT 2337779 A IT2337779 A IT 2337779A IT 1121333 B IT1121333 B IT 1121333B
- Authority
- IT
- Italy
- Prior art keywords
- control circuit
- current control
- telephone users
- double telephone
- double
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/001—Current supply source at the exchanger providing current to substations
- H04M19/008—Using DC/DC converters
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/915,634 US4197432A (en) | 1978-06-15 | 1978-06-15 | Telephone subscriber's loop power control circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
IT7923377A0 IT7923377A0 (it) | 1979-06-08 |
IT1121333B true IT1121333B (it) | 1986-04-02 |
Family
ID=25436038
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT23377/79A IT1121333B (it) | 1978-06-15 | 1979-06-08 | Circuito di comando della corrente dei doppini di utenti telefonici |
Country Status (4)
Country | Link |
---|---|
US (1) | US4197432A (it) |
BE (1) | BE876181A (it) |
CA (1) | CA1116330A (it) |
IT (1) | IT1121333B (it) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4393491A (en) * | 1980-11-05 | 1983-07-12 | Anaconda-Ericsson | Automatic self-test system for a digital multiplexed telecommunication system |
US4361731A (en) * | 1981-02-13 | 1982-11-30 | Bell Telephone Laboratories, Incorporated | Coin telephone control circuit |
US4410982A (en) * | 1981-05-07 | 1983-10-18 | Gte Automatic Electric Labs. Inc. | Arrangement for extending digital signaling to telephone subscribers' substations |
FR2519218A1 (fr) * | 1981-12-24 | 1983-07-01 | Telecommunications Sa | Procede et dispositif d'alimentation d'une regie d'abonne |
NL8202812A (nl) * | 1982-07-12 | 1984-02-01 | Philips Nv | Voedingsinrichting voor het toevoeren van gelijkstroom aan abonneecircuits. |
ES2100803B1 (es) * | 1994-05-20 | 1998-04-16 | Telefonica Nacional Espana Co | Circuito integrado de actuacion y exploracion doble. |
KR0168529B1 (ko) * | 1996-02-12 | 1999-02-01 | 김광호 | 간이 교환장치의 정전시 메모리 보존 회로 |
JP3145942B2 (ja) * | 1997-02-18 | 2001-03-12 | 日本電気株式会社 | 電源システム |
US20060072740A1 (en) * | 2004-09-30 | 2006-04-06 | Tesu Ion C | Selective analog signal sensing from a plurality of integrated circuits using a common node |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3848094A (en) * | 1972-12-29 | 1974-11-12 | Stromberg Carlson Corp | Telephone battery feed circuit |
GB1563802A (en) * | 1975-11-10 | 1980-04-02 | Post Office | Electronic current feed circuit |
US4087647A (en) * | 1977-05-25 | 1978-05-02 | Bell Telephone Laboratories, Incorporated | Circuit for supplying direct current to telephone station sets |
-
1978
- 1978-06-15 US US05/915,634 patent/US4197432A/en not_active Expired - Lifetime
-
1979
- 1979-05-11 BE BE2/57786A patent/BE876181A/xx unknown
- 1979-06-08 IT IT23377/79A patent/IT1121333B/it active
- 1979-06-08 CA CA000329795A patent/CA1116330A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IT7923377A0 (it) | 1979-06-08 |
BE876181A (fr) | 1979-09-03 |
CA1116330A (en) | 1982-01-12 |
US4197432A (en) | 1980-04-08 |
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