CA2035099A1 - Method and configuration for forming a line termination of a telephone line - Google Patents
Method and configuration for forming a line termination of a telephone lineInfo
- Publication number
- CA2035099A1 CA2035099A1 CA2035099A CA2035099A CA2035099A1 CA 2035099 A1 CA2035099 A1 CA 2035099A1 CA 2035099 A CA2035099 A CA 2035099A CA 2035099 A CA2035099 A CA 2035099A CA 2035099 A1 CA2035099 A1 CA 2035099A1
- Authority
- CA
- Canada
- Prior art keywords
- line
- signal
- line terminals
- configuration
- forming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/76—Compensating for differences in line impedance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
- H04M1/585—Anti-side-tone circuits implemented without inductive element
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
Abstract
In a method and configuration for forming a line termination at two line terminals of a telephone line, alternating signals are separated from direct signals applied to line terminals, referred to a reference variable and added to a transmission signal from a transmission terminal to form a resultant actual-value signal. The resultant actual-value signal is compared with a reference signal at a gain-controlled amplifier. The reference signal is formed with an impedance transmission function corresponding to a given termination impedance by weighting the alternating signal at one of the line terminals being connected to a current sensor resistor. A current between the line terminals is determined with a control transistor associated with the current sensor resistor. The control transistor is controlled with the gain-controlled amplifier.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP90101719A EP0439641B1 (en) | 1990-01-29 | 1990-01-29 | Method and device for forming the line termination of a telephone line |
EP90101719.4 | 1990-01-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2035099A1 true CA2035099A1 (en) | 1991-07-30 |
CA2035099C CA2035099C (en) | 2000-08-29 |
Family
ID=8203551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002035099A Expired - Fee Related CA2035099C (en) | 1990-01-29 | 1991-01-28 | Method and configuration for forming a line termination of a telephone line |
Country Status (6)
Country | Link |
---|---|
US (1) | US5271059A (en) |
EP (1) | EP0439641B1 (en) |
JP (1) | JP3034616B2 (en) |
AT (1) | ATE103450T1 (en) |
CA (1) | CA2035099C (en) |
DE (1) | DE59005114D1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4221567C2 (en) * | 1992-07-01 | 1995-07-06 | Siemens Ag | Line termination of a telephone line |
US5396028A (en) * | 1993-05-05 | 1995-03-07 | Texas Instruments Incorporated | Method and apparatus for transmission line termination |
US5515434A (en) * | 1994-06-29 | 1996-05-07 | Harris Corp | Impedance setting circuit for a SLIC |
US5790656A (en) * | 1995-09-29 | 1998-08-04 | Rockwell International Corporation | Data access arrangement with telephone interface |
SE507739C2 (en) * | 1996-11-08 | 1998-07-06 | Ericsson Telefon Ab L M | Device at a line circuit for measuring line voltage |
DE19848606C2 (en) * | 1998-10-21 | 2002-01-03 | Infineon Technologies Ag | Circuit arrangement for the electronic generation of a call impedance |
ATE326113T1 (en) * | 1998-10-21 | 2006-06-15 | Infineon Technologies Ag | CIRCUIT ARRANGEMENT FOR ELECTRONICALLY GENERATING A CALL IMPEDANCE |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4004102A (en) * | 1975-08-08 | 1977-01-18 | Bell Telephone Laboratories, Incorporated | Automatic impedance modification of transmission lines |
US4503289A (en) * | 1983-01-17 | 1985-03-05 | At&T Bell Laboratories | Line circuit with flux compensation and active impedance termination |
NL8400508A (en) * | 1984-02-17 | 1985-09-16 | Philips Nv | AUDIO TRANSMISSION CIRCUIT WITH TRANSMITTER AMPLIFIED AS LINE VOLTAGE STABILIZER. |
JPS6243944A (en) * | 1985-08-21 | 1987-02-25 | Toshiba Corp | Telephone set circuit |
DE3772922D1 (en) * | 1986-09-30 | 1991-10-17 | Siemens Ag | ELECTRONIC SPEAKER ARRANGEMENT. |
BE905921A (en) * | 1986-12-16 | 1987-06-16 | Bell Telephone Mfg | TELECOMMUNICATIONS DEVICE AND CHAINS USED THEREIN. |
US5020102A (en) * | 1989-08-01 | 1991-05-28 | Rockwell International Corporation | Semi-floating AC/DC active termination circuit with current sink |
US4961219A (en) * | 1989-12-04 | 1990-10-02 | Ag Communication Systems Corporation | Circuit for synthesizing an impedance across the tip and ring leads of a telephone line circuit |
-
1990
- 1990-01-29 DE DE90101719T patent/DE59005114D1/en not_active Expired - Fee Related
- 1990-01-29 AT AT90101719T patent/ATE103450T1/en not_active IP Right Cessation
- 1990-01-29 EP EP90101719A patent/EP0439641B1/en not_active Expired - Lifetime
-
1991
- 1991-01-28 CA CA002035099A patent/CA2035099C/en not_active Expired - Fee Related
- 1991-01-28 JP JP3027955A patent/JP3034616B2/en not_active Expired - Fee Related
- 1991-01-29 US US07/647,577 patent/US5271059A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH04213261A (en) | 1992-08-04 |
EP0439641B1 (en) | 1994-03-23 |
EP0439641A1 (en) | 1991-08-07 |
JP3034616B2 (en) | 2000-04-17 |
ATE103450T1 (en) | 1994-04-15 |
CA2035099C (en) | 2000-08-29 |
DE59005114D1 (en) | 1994-04-28 |
US5271059A (en) | 1993-12-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |