HK32385A - Telephone line circuit - Google Patents
Telephone line circuitInfo
- Publication number
- HK32385A HK32385A HK323/85A HK32385A HK32385A HK 32385 A HK32385 A HK 32385A HK 323/85 A HK323/85 A HK 323/85A HK 32385 A HK32385 A HK 32385A HK 32385 A HK32385 A HK 32385A
- Authority
- HK
- Hong Kong
- Prior art keywords
- telephone line
- line circuit
- circuit
- telephone
- line
- 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)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/098,104 US4315106A (en) | 1979-11-28 | 1979-11-28 | Apparatus for regulating current supplied to a telephone line signal of the type employed in digital telephone systems |
Publications (1)
Publication Number | Publication Date |
---|---|
HK32385A true HK32385A (en) | 1985-05-03 |
Family
ID=22267116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
HK323/85A HK32385A (en) | 1979-11-28 | 1985-04-25 | Telephone line circuit |
Country Status (15)
Country | Link |
---|---|
US (1) | US4315106A (fr) |
JP (1) | JPS5693476A (fr) |
AU (1) | AU540480B2 (fr) |
BE (1) | BE886385A (fr) |
BR (1) | BR8007815A (fr) |
CA (1) | CA1155244A (fr) |
CH (1) | CH651985A5 (fr) |
DE (1) | DE3042607C2 (fr) |
ES (1) | ES8106387A1 (fr) |
FR (1) | FR2471099B1 (fr) |
GB (1) | GB2064269B (fr) |
HK (1) | HK32385A (fr) |
IT (1) | IT1193563B (fr) |
NL (1) | NL191623C (fr) |
SE (1) | SE450923B (fr) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56140765A (en) * | 1980-04-01 | 1981-11-04 | Nippon Telegr & Teleph Corp <Ntt> | Circuit current supply circuit |
US4387273A (en) * | 1980-08-25 | 1983-06-07 | International Telephone And Telegraph Corporation | Subscriber line interface circuit with impedance synthesizer |
US4317963A (en) * | 1980-09-22 | 1982-03-02 | International Telephone And Telegraph Corporation | Subscriber line interface circuit utilizing impedance synthesizer and shared voltage source for loop current regulation control |
EP0057009B1 (fr) * | 1981-01-28 | 1985-07-03 | Hitachi, Ltd. | Circuit d'alimentation en courant |
US4454477A (en) * | 1982-04-28 | 1984-06-12 | At&T Bell Laboratories | Loop current detector with threshold setting impedance |
GB2120498B (en) * | 1982-04-29 | 1985-11-20 | Motorola Inc | Regulator circuit |
SE431704B (sv) * | 1982-07-06 | 1984-02-20 | Ericsson Telefon Ab L M | Forfarande vid strommatning av en abonnentapparat fran en telefonvexel |
SE433284B (sv) * | 1982-09-17 | 1984-05-14 | Ericsson Telefon Ab L M | Anordning for strommatning av en abonnentapparat |
US4552994A (en) * | 1982-12-13 | 1985-11-12 | Gte Lenkurt Incorporated Communication Systems | Apparatus for isolating the voice frequency path from the floating battery feed during signalling |
JPS6051359A (ja) * | 1983-08-31 | 1985-03-22 | Nec Corp | 加入者回路の給電回路 |
US4600811A (en) * | 1982-12-28 | 1986-07-15 | Nec Corporation | Subscriber line interface circuit |
JPS59125157A (ja) * | 1982-12-30 | 1984-07-19 | Fujitsu Ltd | 給電回路 |
US4577064A (en) * | 1983-04-29 | 1986-03-18 | Gte Lenkurt Incorporated | Auto-balance circuit for battery feed in a telephone circuit |
US4674119A (en) * | 1984-04-10 | 1987-06-16 | Itt Corporation | Wide-band high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry |
US4567328A (en) * | 1984-05-23 | 1986-01-28 | Burroughs Corp. | Energy detection circuit for a facsimile system controller |
US4581487A (en) * | 1984-07-11 | 1986-04-08 | Itt Corporation | Universal DC feed for telephone line and trunk circuits |
US4612417A (en) * | 1984-07-27 | 1986-09-16 | At&T Bell Laboratories | Electronic battery feed circuit for telephone systems |
US4598173A (en) * | 1984-10-15 | 1986-07-01 | Itt Corporation | Interface circuit for a subscriber line circuit |
US4602130A (en) * | 1984-10-15 | 1986-07-22 | Itt Corporation | Dual voltage source feed circuit configuration for a telephone line circuit |
US4761812A (en) * | 1985-12-10 | 1988-08-02 | U.S. Holding Company, Inc. | Constant power telephone line circuit |
EP0303091A3 (fr) * | 1987-08-13 | 1991-05-29 | Siemens Aktiengesellschaft | Montage pour un circuit de raccordement d'abonné d'un réseaux de télécommunication numérique à multiplexage temporel présent sous forme d'un module |
US5511118A (en) * | 1991-01-31 | 1996-04-23 | Northern Telecom Limited | Method of providing d.c. feed to a telephone line |
US5661794A (en) * | 1992-04-16 | 1997-08-26 | Northern Telecom Limited | Telephone line interface circuit with voltage control |
US5103387A (en) * | 1991-01-31 | 1992-04-07 | Northern Telecom Limited | High voltage converter |
US5337354A (en) * | 1992-07-30 | 1994-08-09 | Hubbell Incorporated | Tip-ring voltage correction circuit |
US5740241A (en) * | 1995-05-12 | 1998-04-14 | Carrier Access Corporation | T1 channel bank control process and apparatus |
US5859906A (en) * | 1996-11-19 | 1999-01-12 | Thomson Consumer Electronics, Inc. | Telephone switch hook interface circuit |
US5815567A (en) * | 1996-05-31 | 1998-09-29 | Multi-Tech Systems, Inc. | Communications interface providing isolation and ringdown features |
WO2002021811A2 (fr) * | 2000-09-06 | 2002-03-14 | Polycom, Inc. | Systeme et procede d'evaluation diagnostique d'un point d'acces a une ligne telephonique ordinaire |
DE10045015B4 (de) * | 2000-09-12 | 2006-01-05 | Infineon Technologies Ag | Vorrichtung und Verfahren zur Regelung einer SLIC-Versorgungsspannung |
US7206405B2 (en) * | 2002-03-06 | 2007-04-17 | Intersil Americas Inc. | Enhanced high voltage interface for partitioned subscriber line interface circuit |
US7003103B2 (en) * | 2002-03-06 | 2006-02-21 | Intersil Americas Inc. | Mode-dependent, multiple bias-driven battery switch for subscriber line interface circuit |
US7050577B2 (en) * | 2002-03-06 | 2006-05-23 | Intersil Americas Inc. | Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections |
US8354885B2 (en) | 2008-05-23 | 2013-01-15 | The Regents Of The University Of California | Operational amplifier |
US7898333B2 (en) * | 2008-05-23 | 2011-03-01 | Teledyne Scientific & Imaging, Llc | Operational amplifier |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH586983A5 (fr) * | 1974-12-23 | 1977-04-15 | Ibm | |
US4056691A (en) * | 1977-01-05 | 1977-11-01 | Bell Telephone Laboratories, Incorporated | Telephone subscriber line circuit |
GB1583634A (en) * | 1977-03-02 | 1981-01-28 | Int Standard Electric Corp | Subscriber line/trunk circuit |
CA1130940A (fr) * | 1978-09-22 | 1982-08-31 | Oki Electric Industry Co., Ltd. | Circuit d'alimentation pour central telephonique |
US4254305A (en) * | 1979-02-07 | 1981-03-03 | International Telephone And Telegraph Corporation | Current limited subscriber line feed circuit |
-
1979
- 1979-11-28 US US06/098,104 patent/US4315106A/en not_active Expired - Lifetime
-
1980
- 1980-11-12 DE DE3042607A patent/DE3042607C2/de not_active Expired
- 1980-11-17 NL NL8006259A patent/NL191623C/xx not_active IP Right Cessation
- 1980-11-18 GB GB8036926A patent/GB2064269B/en not_active Expired
- 1980-11-24 AU AU64625/80A patent/AU540480B2/en not_active Ceased
- 1980-11-25 SE SE8008239A patent/SE450923B/sv not_active IP Right Cessation
- 1980-11-27 CA CA000365618A patent/CA1155244A/fr not_active Expired
- 1980-11-28 FR FR8025243A patent/FR2471099B1/fr not_active Expired
- 1980-11-28 BE BE2/58880A patent/BE886385A/nl not_active IP Right Cessation
- 1980-11-28 ES ES497283A patent/ES8106387A1/es not_active Expired
- 1980-11-28 BR BR8007815A patent/BR8007815A/pt unknown
- 1980-11-28 JP JP16681280A patent/JPS5693476A/ja active Granted
- 1980-11-28 IT IT26298/80A patent/IT1193563B/it active
- 1980-11-28 CH CH8836/80A patent/CH651985A5/de not_active IP Right Cessation
-
1985
- 1985-04-25 HK HK323/85A patent/HK32385A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
SE8008239L (sv) | 1981-05-29 |
GB2064269A (en) | 1981-06-10 |
FR2471099A1 (fr) | 1981-06-12 |
CA1155244A (fr) | 1983-10-11 |
ES497283A0 (es) | 1981-08-16 |
DE3042607A1 (de) | 1981-08-20 |
BE886385A (nl) | 1981-06-01 |
GB2064269B (en) | 1983-12-21 |
IT8026298A0 (it) | 1980-11-28 |
JPS5693476A (en) | 1981-07-29 |
CH651985A5 (de) | 1985-10-15 |
SE450923B (sv) | 1987-08-10 |
FR2471099B1 (fr) | 1988-11-04 |
AU6462580A (en) | 1981-06-04 |
JPS638666B2 (fr) | 1988-02-24 |
ES8106387A1 (es) | 1981-08-16 |
BR8007815A (pt) | 1981-06-16 |
IT1193563B (it) | 1988-07-08 |
DE3042607C2 (de) | 1984-01-12 |
US4315106A (en) | 1982-02-09 |
AU540480B2 (en) | 1984-11-22 |
NL8006259A (nl) | 1981-07-01 |
NL191623B (nl) | 1995-07-03 |
NL191623C (nl) | 1995-11-06 |
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