CA2152901A1 - Method of providing d.c. feed to a telephone line - Google Patents

Method of providing d.c. feed to a telephone line

Info

Publication number
CA2152901A1
CA2152901A1 CA 2152901 CA2152901A CA2152901A1 CA 2152901 A1 CA2152901 A1 CA 2152901A1 CA 2152901 CA2152901 CA 2152901 CA 2152901 A CA2152901 A CA 2152901A CA 2152901 A1 CA2152901 A1 CA 2152901A1
Authority
CA
Canada
Prior art keywords
feed
supply voltage
line
voltage
drive circuit
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
CA 2152901
Other languages
French (fr)
Other versions
CA2152901C (en
Inventor
Stanley Adam Gores
Joseph Francois Michel Darveau
Francois Yvon Tremblay
Stanley Daniel Rosenbaum
Reinhard Werner Rosch
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.)
Nortel Networks Ltd
Original Assignee
Stanley Adam Gores
Joseph Francois Michel Darveau
Francois Yvon Tremblay
Stanley Daniel Rosenbaum
Reinhard Werner Rosch
Bell-Northern Research Ltd.
Northern Telecom Limited
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 Stanley Adam Gores, Joseph Francois Michel Darveau, Francois Yvon Tremblay, Stanley Daniel Rosenbaum, Reinhard Werner Rosch, Bell-Northern Research Ltd., Northern Telecom Limited filed Critical Stanley Adam Gores
Publication of CA2152901A1 publication Critical patent/CA2152901A1/en
Application granted granted Critical
Publication of CA2152901C publication Critical patent/CA2152901C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/023—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone by reversing the polarity of the current at the exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

A two-wire telephone line is supplied with d.c. feed from a drive circuit (10) including two amplifiers (32) via which a transmission signal (Rx) is supplied to the line. Output potentials (TV, RV) of the two amplifiers determine a loop current (IL) on the line, which is monitored and used to control a supply voltage (CV) for the drive circuit, the amplifier output potentials being offset from the supply potentials by headroom voltages (TH, RH) to accommodate the transmission signal. The resulting current limiting voltage control acts iteratively to converge the supply voltage and a target voltage (TG) which is inversely dependent on an amount by which the loop current exceeds a predetermined value, the rate of convergence being fast for high loop currents for rapid response and slow for small differences to provide stable operation. The headroom voltages can be increased to nearly the supply voltage to reverse the polarity of the d.c. feed while maintaining current limiting.
CA 2152901 1993-01-28 1993-06-30 Method of providing d.c. feed to a telephone line Expired - Fee Related CA2152901C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1024493A 1993-01-28 1993-01-28
US08/010,244 1993-01-28

Publications (2)

Publication Number Publication Date
CA2152901A1 true CA2152901A1 (en) 1994-08-04
CA2152901C CA2152901C (en) 1998-04-21

Family

ID=21744778

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2152901 Expired - Fee Related CA2152901C (en) 1993-01-28 1993-06-30 Method of providing d.c. feed to a telephone line

Country Status (2)

Country Link
CA (1) CA2152901C (en)
WO (1) WO1994017619A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1017211B1 (en) * 1998-12-31 2005-10-26 STMicroelectronics S.r.l. Monolithically integrated telephone circuit for driving wide-band telephone lines for data transmission
DE69927927D1 (en) 1998-12-31 2005-12-01 St Microelectronics Srl Monolithically integrated subscriber circuit arrangement for driving a broadband line for data transmission
CN101867662B (en) * 2010-05-24 2015-01-28 中兴通讯股份有限公司 High-impedance monitoring device and method for user call

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8000859A (en) * 1980-02-12 1981-09-01 Philips Nv DEVICE FOR SUPPLYING A CURRENT VOLTAGE TO A SUBSCRIPTION LINE.
US4431868A (en) * 1981-07-09 1984-02-14 International Telephone And Telegraph Corporation Solid state telephone line interface circuit with ringing capability
NL8103572A (en) * 1981-07-29 1983-02-16 Philips Nv FLOATING.

Also Published As

Publication number Publication date
WO1994017619A1 (en) 1994-08-04
CA2152901C (en) 1998-04-21

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed