BR7903166A - Circuito telefonico eletronico para linhas de assinantes - Google Patents
Circuito telefonico eletronico para linhas de assinantesInfo
- Publication number
- BR7903166A BR7903166A BR7903166A BR7903166A BR7903166A BR 7903166 A BR7903166 A BR 7903166A BR 7903166 A BR7903166 A BR 7903166A BR 7903166 A BR7903166 A BR 7903166A BR 7903166 A BR7903166 A BR 7903166A
- Authority
- BR
- Brazil
- Prior art keywords
- subscriber lines
- telephone circuit
- electronic telephone
- electronic
- 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)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT68269/78A IT1159706B (it) | 1978-06-02 | 1978-06-02 | Circuito telefonico elettronico di linea d'utente |
Publications (1)
Publication Number | Publication Date |
---|---|
BR7903166A true BR7903166A (pt) | 1980-01-15 |
Family
ID=11308779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BR7903166A BR7903166A (pt) | 1978-06-02 | 1979-05-21 | Circuito telefonico eletronico para linhas de assinantes |
Country Status (12)
Country | Link |
---|---|
US (1) | US4287392A (pt) |
JP (1) | JPS5853542B2 (pt) |
BE (1) | BE876692A (pt) |
BR (1) | BR7903166A (pt) |
CA (1) | CA1114084A (pt) |
CH (1) | CH634703A5 (pt) |
DE (1) | DE2922271C2 (pt) |
FR (1) | FR2427751A1 (pt) |
GB (1) | GB2022363B (pt) |
IT (1) | IT1159706B (pt) |
NL (1) | NL7904313A (pt) |
SE (1) | SE7904735L (pt) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2502434A1 (fr) * | 1981-03-20 | 1982-09-24 | Trt Telecom Radio Electr | Circuit pour reduire la consommation dans un equipement de ligne d'abonne en cas de faux appel |
US4473719A (en) * | 1982-05-17 | 1984-09-25 | At&T Bell Laboratories | Switchhook status detector |
DE3237681C2 (de) * | 1982-10-12 | 1986-03-27 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Speiseschaltung für einen veränderlichen Verbraucherwiderstand und mit unterschiedlich wirkendem Ausgangswiderstand |
JPS59122053U (ja) * | 1983-02-03 | 1984-08-17 | エンネツ株式会社 | 植物栽培用加温機 |
US4558183A (en) * | 1983-10-03 | 1985-12-10 | Cellutron Corporation | Opto-coupler interfacing circuit |
GB2287155B (en) * | 1994-02-23 | 1998-08-12 | Motorola Inc | Telecommunications device |
CA2146596C (en) * | 1994-04-29 | 1999-09-21 | Harry W. Moore, Iii | Loop current detector |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1199827B (de) * | 1964-05-21 | 1965-09-02 | Telefunken Patent | Schaltungsanordnung fuer die Speisung der Teilnehmerstellen in Fernmelde-, insbesondere Fernsprechanlagen |
US3410961A (en) * | 1965-10-12 | 1968-11-12 | Bell Telephone Labor Inc | Line circuit for a telephone system having optical solid state means |
US3649769A (en) * | 1970-10-28 | 1972-03-14 | Gen Electric | Circuit for supplying direct current to a telephone line |
CH586984A5 (pt) * | 1974-12-23 | 1977-04-15 | Ibm | |
JPS4950860A (pt) * | 1972-09-18 | 1974-05-17 | ||
US3783194A (en) * | 1972-11-20 | 1974-01-01 | Milgo Electronic Corp | Data modem having a fast turn-around time over direct distance dialed networks |
US3848094A (en) * | 1972-12-29 | 1974-11-12 | Stromberg Carlson Corp | Telephone battery feed circuit |
FR2216733B1 (pt) * | 1973-01-31 | 1978-05-12 | Labo Cent Telecommunicat | |
FR2254167B2 (pt) * | 1973-12-10 | 1978-08-18 | Labo Cent Telecommunicat | |
FR2254168A1 (en) * | 1973-12-11 | 1975-07-04 | Ass Ouvriers Instr Precision | Telephone line supply device - is an active electronic device acting as resistance for direct current and high impedance for A.C. |
US3914556A (en) * | 1974-06-12 | 1975-10-21 | Itt | On-hook and off-hook detector for telephone switching systems |
US3955052A (en) * | 1974-11-18 | 1976-05-04 | Tadiran Israel Electronics Industries Ltd. | Subscriber unit particularly useful for time-division-multiplex system |
JPS5199408A (pt) * | 1975-02-28 | 1976-09-02 | Hitachi Ltd | |
DE2534609C3 (de) * | 1975-08-02 | 1978-05-18 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Schaltungsanordnung für die zentrale Speisung von Teilnehmerstellen in Fernmelde-, insbesondere Fernsprechanlagen |
GB1563802A (en) * | 1975-11-10 | 1980-04-02 | Post Office | Electronic current feed circuit |
JPS5267504A (en) * | 1975-12-02 | 1977-06-04 | Oki Electric Ind Co Ltd | Speaking current supply and supervision system |
CH599731A5 (pt) * | 1976-03-02 | 1978-05-31 | Ibm | |
DE2613590C2 (de) * | 1976-03-30 | 1977-10-27 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zur Auswertung von Zustandsänderung auf Leitungen in Fernmelde- insbesondere Fernsprechanlagen |
JPS52142905A (en) * | 1976-05-24 | 1977-11-29 | Hitachi Denshi Ltd | Control device of telephone call current supply |
US4087646A (en) * | 1977-01-28 | 1978-05-02 | Bell Telephone Laboratories, Incorporated | Dual mode telephone subscriber loop current detector |
US4142075A (en) * | 1977-10-11 | 1979-02-27 | Burr-Brown Research Corporation | Interface circuit and method for telephone extension lines |
US4228323A (en) * | 1979-01-31 | 1980-10-14 | Bell Telephone Laboratories, Incorporated | Variable loop length compensated barrier circuit |
-
1978
- 1978-06-02 IT IT68269/78A patent/IT1159706B/it active
-
1979
- 1979-05-21 BR BR7903166A patent/BR7903166A/pt unknown
- 1979-05-22 CH CH479779A patent/CH634703A5/it not_active IP Right Cessation
- 1979-05-22 CA CA328,048A patent/CA1114084A/en not_active Expired
- 1979-05-22 GB GB7917736A patent/GB2022363B/en not_active Expired
- 1979-05-22 FR FR7912965A patent/FR2427751A1/fr not_active Withdrawn
- 1979-05-25 JP JP54064103A patent/JPS5853542B2/ja not_active Expired
- 1979-05-30 US US06/043,848 patent/US4287392A/en not_active Expired - Lifetime
- 1979-05-30 SE SE7904735A patent/SE7904735L/ unknown
- 1979-05-31 DE DE2922271A patent/DE2922271C2/de not_active Expired
- 1979-05-31 NL NL7904313A patent/NL7904313A/xx not_active Application Discontinuation
- 1979-05-31 BE BE0/195508A patent/BE876692A/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB2022363A (en) | 1979-12-12 |
IT7868269A0 (it) | 1978-06-02 |
FR2427751A1 (fr) | 1979-12-28 |
NL7904313A (nl) | 1979-12-04 |
IT1159706B (it) | 1987-03-04 |
JPS54159114A (en) | 1979-12-15 |
SE7904735L (sv) | 1979-12-03 |
DE2922271A1 (de) | 1979-12-06 |
BE876692A (fr) | 1979-09-17 |
DE2922271C2 (de) | 1983-02-24 |
CA1114084A (en) | 1981-12-08 |
US4287392A (en) | 1981-09-01 |
GB2022363B (en) | 1982-06-16 |
CH634703A5 (it) | 1983-02-15 |
JPS5853542B2 (ja) | 1983-11-30 |
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