ZA807308B - Telephone line feed circuit - Google Patents
Telephone line feed circuitInfo
- Publication number
- ZA807308B ZA807308B ZA00807308A ZA807308A ZA807308B ZA 807308 B ZA807308 B ZA 807308B ZA 00807308 A ZA00807308 A ZA 00807308A ZA 807308 A ZA807308 A ZA 807308A ZA 807308 B ZA807308 B ZA 807308B
- Authority
- ZA
- South Africa
- Prior art keywords
- telephone line
- line feed
- feed circuit
- circuit
- telephone
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
-
- 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)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7941245A GB2064915B (en) | 1979-11-29 | 1979-11-29 | Telephone line feed circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA807308B true ZA807308B (en) | 1981-11-25 |
Family
ID=10509491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA00807308A ZA807308B (en) | 1979-11-29 | 1980-11-21 | Telephone line feed circuit |
Country Status (13)
Country | Link |
---|---|
US (1) | US4345117A (it) |
JP (1) | JPS5690671A (it) |
AU (1) | AU535131B2 (it) |
BE (1) | BE890402A (it) |
FR (1) | FR2471100B1 (it) |
GB (1) | GB2064915B (it) |
IE (1) | IE50881B1 (it) |
IT (1) | IT1134498B (it) |
NL (1) | NL8006307A (it) |
NZ (1) | NZ195574A (it) |
PT (1) | PT72123B (it) |
SE (1) | SE8008104L (it) |
ZA (1) | ZA807308B (it) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2066023B (en) * | 1979-12-13 | 1983-11-09 | Standard Telephones Cables Ltd | Telephone line interface |
US4465967A (en) * | 1981-01-28 | 1984-08-14 | Hitachi, Ltd. | Current supply circuit |
JPS57154965A (en) * | 1981-03-19 | 1982-09-24 | Fujitsu Ltd | Constant current source type filter having self-bias function |
SE431704B (sv) * | 1982-07-06 | 1984-02-20 | Ericsson Telefon Ab L M | Forfarande vid strommatning av en abonnentapparat fran en telefonvexel |
SE433285B (sv) * | 1982-09-22 | 1984-05-14 | Ericsson Telefon Ab L M | Anordning for strommatning av en abonnentapparat |
US4577064A (en) * | 1983-04-29 | 1986-03-18 | Gte Lenkurt Incorporated | Auto-balance circuit for battery feed in a telephone circuit |
SE465799B (sv) * | 1990-03-15 | 1991-10-28 | Ericsson Telefon Ab L M | Anordning foer reducerad effektmatning till en abonnentlinje |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3870896A (en) * | 1972-10-30 | 1975-03-11 | Lorain Prod Corp | Controllable current source |
FR2279287A1 (fr) * | 1974-07-16 | 1976-02-13 | Cit Alcatel | Unite d'alimentation a intensite constante |
US4037066A (en) * | 1975-03-20 | 1977-07-19 | Lorain Products Corporation | Repeater for transmission lines |
US4048552A (en) * | 1976-02-12 | 1977-09-13 | Bell Telephone Laboratories, Incorporated | Digitally regulated inverter |
US4142075A (en) * | 1977-10-11 | 1979-02-27 | Burr-Brown Research Corporation | Interface circuit and method for telephone extension lines |
US4268723A (en) * | 1979-09-04 | 1981-05-19 | Western Electric Company | Circuits and methods for initializing the loop current of a telephone set |
-
1979
- 1979-11-29 GB GB7941245A patent/GB2064915B/en not_active Expired
-
1980
- 1980-11-18 NZ NZ195574A patent/NZ195574A/en unknown
- 1980-11-19 SE SE8008104A patent/SE8008104L/ not_active Application Discontinuation
- 1980-11-19 NL NL8006307A patent/NL8006307A/nl not_active Application Discontinuation
- 1980-11-20 US US06/208,559 patent/US4345117A/en not_active Expired - Lifetime
- 1980-11-21 ZA ZA00807308A patent/ZA807308B/xx unknown
- 1980-11-24 AU AU64624/80A patent/AU535131B2/en not_active Ceased
- 1980-11-27 PT PT72123A patent/PT72123B/pt unknown
- 1980-11-28 FR FR8025244A patent/FR2471100B1/fr not_active Expired
- 1980-11-28 IE IE2484/80A patent/IE50881B1/en unknown
- 1980-11-28 IT IT26297/80A patent/IT1134498B/it active
- 1980-11-29 JP JP16903880A patent/JPS5690671A/ja active Pending
-
1981
- 1981-09-18 BE BE2/59365A patent/BE890402A/fr not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
IE802484L (en) | 1981-05-29 |
IE50881B1 (en) | 1986-08-06 |
NZ195574A (en) | 1984-04-27 |
PT72123A (en) | 1980-12-01 |
IT8026297A0 (it) | 1980-11-28 |
PT72123B (en) | 1981-11-02 |
AU6462480A (en) | 1981-06-04 |
US4345117A (en) | 1982-08-17 |
SE8008104L (sv) | 1981-05-30 |
FR2471100B1 (fr) | 1985-06-28 |
IT1134498B (it) | 1986-08-13 |
JPS5690671A (en) | 1981-07-22 |
FR2471100A1 (fr) | 1981-06-12 |
GB2064915A (en) | 1981-06-17 |
NL8006307A (nl) | 1981-07-01 |
AU535131B2 (en) | 1984-03-01 |
BE890402A (fr) | 1982-01-18 |
GB2064915B (en) | 1984-03-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU538261B2 (en) | Telephone line feed circuit | |
GB2064269B (en) | Telephone line circuit | |
GB2064244B (en) | Telephone line circuit | |
AU542803B2 (en) | Telephone line feed circuit | |
GB2064902B (en) | Telephone line circuit | |
GB2014398B (en) | Telephone line circuit | |
GB2107554B (en) | Telephone line circuit | |
GB2050116B (en) | Telephone line circuit | |
JPS5541095A (en) | Line feeding type loudspeaker telephone circuit device | |
GB2071461B (en) | Telephone line feed | |
GB2015305B (en) | Telephone line circuit | |
GB2055274B (en) | Telecommunications line circuit | |
JPS55150659A (en) | Line circuit | |
GB2064915B (en) | Telephone line feed circuit | |
JPS55150660A (en) | Connecting circuit for telephone line | |
GB2055021B (en) | Telephone line circuit | |
GB2106345B (en) | Telephone line circuit | |
JPS5623090A (en) | Telephone line circuit |