WO1999027703A3 - Subscriber line interface circuit - Google Patents

Subscriber line interface circuit Download PDF

Info

Publication number
WO1999027703A3
WO1999027703A3 PCT/FI1998/000900 FI9800900W WO9927703A3 WO 1999027703 A3 WO1999027703 A3 WO 1999027703A3 FI 9800900 W FI9800900 W FI 9800900W WO 9927703 A3 WO9927703 A3 WO 9927703A3
Authority
WO
WIPO (PCT)
Prior art keywords
subscriber line
voltage
amplifier
output voltages
interface circuit
Prior art date
Application number
PCT/FI1998/000900
Other languages
Finnish (fi)
French (fr)
Other versions
WO1999027703A2 (en
Inventor
Caj Nordstroem
Original Assignee
Nokia Telecommunications Oy
Caj Nordstroem
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 Nokia Telecommunications Oy, Caj Nordstroem filed Critical Nokia Telecommunications Oy
Priority to AU12378/99A priority Critical patent/AU1237899A/en
Publication of WO1999027703A2 publication Critical patent/WO1999027703A2/en
Publication of WO1999027703A3 publication Critical patent/WO1999027703A3/en

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
    • H04M19/005—Feeding arrangements without the use of line transformers
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

An output stage of a subscriber line interface circuit comprising two amplifiers, a first (111) one of which is configured to operate as an inverting amplifier (negative amplification) and a second (110) one as a non-inverting amplifier (positive amplification). Each amplifier has an output connected to a respective wire (a, b) in a subscriber line. A common reference voltage (Vref) and a common control voltage (Vc) are supplied to each amplifier (110, 111). The reference voltage (Vref) is used for setting the average voltage of the subscriber line. The control voltage (Vc) level determines the offset of the amplifier output voltages (Vb, Va) from the average voltage. The difference between the amplifier output voltages is the subscriber line operating voltage. In an on-hook state, the control voltage (Vc) is limited to a level ensuring that the maximum output voltages of the amplifiers (110, 111) are at a predetermined voltage offset from ground and from operating voltage potential, so as to allow an alternating current information signal to be transferred over the subscriber line in the on-hook state.
PCT/FI1998/000900 1997-11-18 1998-11-17 Subscriber line interface circuit WO1999027703A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12378/99A AU1237899A (en) 1997-11-18 1998-11-17 Subscriber line interface circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI974272A FI104934B (en) 1997-11-18 1997-11-18 A subscriber line interface circuit
FI974272 1997-11-18

Publications (2)

Publication Number Publication Date
WO1999027703A2 WO1999027703A2 (en) 1999-06-03
WO1999027703A3 true WO1999027703A3 (en) 1999-08-26

Family

ID=8549974

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1998/000900 WO1999027703A2 (en) 1997-11-18 1998-11-17 Subscriber line interface circuit

Country Status (3)

Country Link
AU (1) AU1237899A (en)
FI (1) FI104934B (en)
WO (1) WO1999027703A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0002350L (en) 2000-06-21 2001-12-22 Ericsson Telefon Ab L M A method of generating a ring signal in a subscriber line circuit
DE10140357C2 (en) 2001-08-17 2003-07-24 Infineon Technologies Ag Telephone system with adjustable bell voltage
DE10240815B4 (en) 2002-08-30 2006-02-23 Infineon Technologies Ag Method for setting a call signal stream in a subscriber line and circuit arrangement
DE10240810B3 (en) * 2002-08-30 2004-04-08 Infineon Technologies Ag Method and circuit arrangement for controlling a subscriber line interface circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4431868A (en) * 1981-07-09 1984-02-14 International Telephone And Telegraph Corporation Solid state telephone line interface circuit with ringing capability
GB2193063A (en) * 1986-07-08 1988-01-27 Toshiba Kk Line circuits
US4853959A (en) * 1986-06-27 1989-08-01 Telefonaktiebolaget L M Ericsson Method and apparatus for feeding power to a telephone line such that for restricted battery voltage there is enabled the transmission of an undistorted speech signal
WO1996015617A1 (en) * 1994-11-10 1996-05-23 Telefonaktiebolaget Lm Ericsson (Publ) Supply voltage switching apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4431868A (en) * 1981-07-09 1984-02-14 International Telephone And Telegraph Corporation Solid state telephone line interface circuit with ringing capability
US4853959A (en) * 1986-06-27 1989-08-01 Telefonaktiebolaget L M Ericsson Method and apparatus for feeding power to a telephone line such that for restricted battery voltage there is enabled the transmission of an undistorted speech signal
GB2193063A (en) * 1986-07-08 1988-01-27 Toshiba Kk Line circuits
WO1996015617A1 (en) * 1994-11-10 1996-05-23 Telefonaktiebolaget Lm Ericsson (Publ) Supply voltage switching apparatus

Also Published As

Publication number Publication date
FI104934B (en) 2000-04-28
AU1237899A (en) 1999-06-15
FI974272A (en) 1999-05-19
FI974272A0 (en) 1997-11-18
WO1999027703A2 (en) 1999-06-03

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