PT87686A - APPARATUS FOR OBTAINING A CONTROLLABLE TERMINAL IMPEDANCE FROM LINE - Google Patents
APPARATUS FOR OBTAINING A CONTROLLABLE TERMINAL IMPEDANCE FROM LINEInfo
- Publication number
- PT87686A PT87686A PT8768688A PT8768688A PT87686A PT 87686 A PT87686 A PT 87686A PT 8768688 A PT8768688 A PT 8768688A PT 8768688 A PT8768688 A PT 8768688A PT 87686 A PT87686 A PT 87686A
- Authority
- PT
- Portugal
- Prior art keywords
- obtaining
- line
- terminal impedance
- controllable terminal
- controllable
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/586—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using an electronic circuit
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Networks Using Active Elements (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8702486A SE457923B (en) | 1987-06-15 | 1987-06-15 | DEVICE TO ACHIEVE A CONTROLLABLE LINE CUT IMPEDANCE |
Publications (1)
Publication Number | Publication Date |
---|---|
PT87686A true PT87686A (en) | 1989-05-31 |
Family
ID=20368864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PT8768688A PT87686A (en) | 1987-06-15 | 1988-06-08 | APPARATUS FOR OBTAINING A CONTROLLABLE TERMINAL IMPEDANCE FROM LINE |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0321540A1 (en) |
AU (1) | AU1957688A (en) |
ES (1) | ES2008537A6 (en) |
GR (1) | GR880100377A (en) |
PT (1) | PT87686A (en) |
SE (1) | SE457923B (en) |
WO (1) | WO1988010539A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5073924A (en) * | 1990-05-01 | 1991-12-17 | Frisby Kenneth G | Telephone line noise filter apparatus |
JPH04280597A (en) * | 1991-03-08 | 1992-10-06 | Nec Corp | Subscriber circuit |
IT1259009B (en) * | 1992-07-24 | 1996-03-11 | Italtel Telematica | METHOD AND DEVICE FOR THE ADAPTATION OF USER TERMINATION IMPEDANCES AND USER ATTACK TO THE CHARACTERISTIC IMPEDANCE OF THE USER TELEPHONE LINE |
ATE187029T1 (en) * | 1993-09-02 | 1999-12-15 | Siemens Ag | CIRCUIT ARRANGEMENT FOR GENERATING A VARIABLE LINE TERMINATION IMPEDANCE |
AU681169B2 (en) * | 1993-10-01 | 1997-08-21 | Alcatel Australia Limited | Line termination circuit |
JPH0851651A (en) * | 1994-06-24 | 1996-02-20 | Harris Corp | Subscriber's line interface circuit,impedance matching method and echo canceling method between hybrids |
US5583934A (en) * | 1995-03-03 | 1996-12-10 | Advanced Micro Devices, Inc. | DC level control for an electronic telephone line card |
SE511825C2 (en) * | 1998-03-31 | 1999-12-06 | Ericsson Telefon Ab L M | Method and apparatus in an analog line circuit |
KR100408739B1 (en) * | 2001-12-04 | 2003-12-11 | 엘지이노텍 주식회사 | Analog slic circuit for board of switch board subscriber |
US7062037B2 (en) * | 2002-04-30 | 2006-06-13 | Texas Instruments Incorporated | Generic line impedance matching circuit using decomposed configurable transfer functions |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU536210B2 (en) * | 1980-06-18 | 1984-04-19 | Telefonaktiebolaget Lm Ericsson (Publ) | Subscriber line audio processing circuit apparatus |
JPS5895488A (en) * | 1981-12-02 | 1983-06-07 | Hitachi Ltd | Line circuit |
EP0163298B1 (en) * | 1984-05-30 | 1992-09-30 | Hitachi, Ltd. | Pcm coder/decoder with two-wire/four-wire conversion |
GB8528843D0 (en) * | 1985-11-22 | 1985-12-24 | British Telecomm | Codec |
-
1987
- 1987-06-15 SE SE8702486A patent/SE457923B/en not_active Application Discontinuation
-
1988
- 1988-05-18 AU AU19576/88A patent/AU1957688A/en not_active Abandoned
- 1988-05-18 EP EP19880906145 patent/EP0321540A1/en not_active Withdrawn
- 1988-05-18 WO PCT/SE1988/000254 patent/WO1988010539A1/en not_active Application Discontinuation
- 1988-06-08 PT PT8768688A patent/PT87686A/en unknown
- 1988-06-10 ES ES8801804A patent/ES2008537A6/en not_active Expired
- 1988-06-13 GR GR880100377A patent/GR880100377A/en unknown
Also Published As
Publication number | Publication date |
---|---|
ES2008537A6 (en) | 1989-07-16 |
WO1988010539A1 (en) | 1988-12-29 |
SE8702486L (en) | 1988-12-16 |
SE8702486D0 (en) | 1987-06-15 |
SE457923B (en) | 1989-02-06 |
GR880100377A (en) | 1989-03-08 |
EP0321540A1 (en) | 1989-06-28 |
AU1957688A (en) | 1989-01-19 |
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