IT1049925B - Circuito d interfaccia di linea di abbonato - Google Patents
Circuito d interfaccia di linea di abbonatoInfo
- Publication number
- IT1049925B IT1049925B IT2975975A IT2975975A IT1049925B IT 1049925 B IT1049925 B IT 1049925B IT 2975975 A IT2975975 A IT 2975975A IT 2975975 A IT2975975 A IT 2975975A IT 1049925 B IT1049925 B IT 1049925B
- Authority
- IT
- Italy
- Prior art keywords
- interface circuit
- line interface
- subscription line
- subscription
- circuit
- 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
- H04M19/005—Feeding arrangements without the use of line transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (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 |
---|---|---|---|
CH1722074A CH586984A5 (it) | 1974-12-23 | 1974-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
IT1049925B true IT1049925B (it) | 1981-02-10 |
Family
ID=4423697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT2975975A IT1049925B (it) | 1974-12-23 | 1975-11-28 | Circuito d interfaccia di linea di abbonato |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS5186904A (it) |
CH (1) | CH586984A5 (it) |
DE (1) | DE2551816C3 (it) |
FR (1) | FR2296339A1 (it) |
GB (1) | GB1481750A (it) |
IT (1) | IT1049925B (it) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5413715A (en) * | 1977-07-01 | 1979-02-01 | Nippon Telegr & Teleph Corp <Ntt> | Four-wire switching system |
JPS5494810A (en) * | 1978-01-11 | 1979-07-26 | Hitachi Ltd | Supply system for channel current |
JPS5494811A (en) * | 1978-01-11 | 1979-07-26 | Hitachi Ltd | Supply system for channel current |
FR2414832A1 (fr) * | 1978-01-13 | 1979-08-10 | Labo Cent Telecommunicat | Pont d'alimentation pour ligne telephonique |
IT1159706B (it) * | 1978-06-02 | 1987-03-04 | Cselt Centro Studi Lab Telecom | Circuito telefonico elettronico di linea d'utente |
NL7810086A (nl) * | 1978-10-06 | 1980-04-09 | Philips Nv | Voedingsbrug voor een abonneestroomloop. |
US4254305A (en) * | 1979-02-07 | 1981-03-03 | International Telephone And Telegraph Corporation | Current limited subscriber line feed circuit |
FR2460078B1 (fr) * | 1979-06-25 | 1986-12-12 | Trt Telecom Radio Electr | Joncteur d'abonne electronique |
CA1157175A (en) * | 1981-02-20 | 1983-11-15 | Mitel Corporation | Power saving line circuit |
DE3214624C2 (de) * | 1982-04-20 | 1986-05-28 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zur Auswertung von Teilnehmerschleifenzuständen in Fernsprechanlagen, insbesondere in Fernsprechnebenstellenanlagen |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3649769A (en) * | 1970-10-28 | 1972-03-14 | Gen Electric | Circuit for supplying direct current to a telephone line |
-
1974
- 1974-12-23 CH CH1722074A patent/CH586984A5/xx not_active IP Right Cessation
-
1975
- 1975-10-31 GB GB4527575A patent/GB1481750A/en not_active Expired
- 1975-11-10 FR FR7535236A patent/FR2296339A1/fr active Granted
- 1975-11-19 DE DE19752551816 patent/DE2551816C3/de not_active Expired
- 1975-11-28 IT IT2975975A patent/IT1049925B/it active
- 1975-12-19 JP JP15069275A patent/JPS5186904A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
DE2551816C3 (de) | 1980-10-30 |
JPS5619784B2 (it) | 1981-05-09 |
FR2296339A1 (fr) | 1976-07-23 |
FR2296339B1 (it) | 1981-12-31 |
GB1481750A (en) | 1977-08-03 |
DE2551816B2 (de) | 1979-06-13 |
JPS5186904A (ja) | 1976-07-30 |
DE2551816A1 (de) | 1976-06-24 |
CH586984A5 (it) | 1977-04-15 |
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