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 line

Info

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
Application number
CA2035099A
Other languages
French (fr)
Other versions
CA2035099C (en
Inventor
Franz Dielacher
Gerald Wallnberger
Karl Formanek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of CA2035099A1 publication Critical patent/CA2035099A1/en
Application granted granted Critical
Publication of CA2035099C publication Critical patent/CA2035099C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/738Interface circuits for coupling substations to external telephone lines
    • H04M1/76Compensating for differences in line impedance
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/58Anti-side-tone circuits
    • H04M1/585Anti-side-tone circuits implemented without inductive element
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M19/00Current supply arrangements for telephone systems
    • H04M19/08Current 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.
CA002035099A 1990-01-29 1991-01-28 Method and configuration for forming a line termination of a telephone line Expired - Fee Related CA2035099C (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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

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