CA2042683A1 - Enhanced high voltage line interface circuit - Google Patents

Enhanced high voltage line interface circuit

Info

Publication number
CA2042683A1
CA2042683A1 CA2042683A CA2042683A CA2042683A1 CA 2042683 A1 CA2042683 A1 CA 2042683A1 CA 2042683 A CA2042683 A CA 2042683A CA 2042683 A CA2042683 A CA 2042683A CA 2042683 A1 CA2042683 A1 CA 2042683A1
Authority
CA
Canada
Prior art keywords
switching system
interface circuit
high voltage
line interface
subscriber
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
CA2042683A
Other languages
French (fr)
Other versions
CA2042683C (en
Inventor
Lalit O. Patel
Michael Warner
Absar Naseer
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.)
AG Communication Systems Corp
Original Assignee
AG Communication Systems Corp
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 AG Communication Systems Corp filed Critical AG Communication Systems Corp
Publication of CA2042683A1 publication Critical patent/CA2042683A1/en
Application granted granted Critical
Publication of CA2042683C publication Critical patent/CA2042683C/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
    • H04M19/001—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
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Abstract

An enhanced high voltage line interface circuit for a digital switching system over which a connection is established between a digital switching system and a subscriber instrument via a subscriber loop. The high voltage line interface circuit includes in combination circuits that provide power to the subscriber loop and convert received analog voice signals transmitted from the subscriber instrument into differential voltage voice signals for subsequent conversion to digital data for use by the digital switching system. Additionally, differential voltage voice signals from the digital switching system are converted to analog voice signals for transmission along the subscriber loop to the subscriber instrument.
The high voltage line interface circuit further includes circuits that detect and monitor the subscriber loop status and develop digital logic output signals that are used to report the status of the loop to a digital switching system controller.
CA002042683A 1990-10-18 1991-05-15 Enhanced high voltage line interface circuit Expired - Fee Related CA2042683C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/599,537 US5175764A (en) 1990-10-18 1990-10-18 Enhanced high voltage line interface circuit
US599,537 1990-10-18

Publications (2)

Publication Number Publication Date
CA2042683A1 true CA2042683A1 (en) 1992-04-19
CA2042683C CA2042683C (en) 1998-10-06

Family

ID=24400031

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002042683A Expired - Fee Related CA2042683C (en) 1990-10-18 1991-05-15 Enhanced high voltage line interface circuit

Country Status (2)

Country Link
US (1) US5175764A (en)
CA (1) CA2042683C (en)

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US5511118A (en) * 1991-01-31 1996-04-23 Northern Telecom Limited Method of providing d.c. feed to a telephone line
JP2744357B2 (en) * 1991-04-23 1998-04-28 キヤノン株式会社 Private branch exchange
US5303229A (en) * 1991-07-31 1994-04-12 Alcatel Network Systems, Inc. Optical network unit
US5323460A (en) * 1992-01-07 1994-06-21 Ag Communication Systems Corporation Enhanced subscriber line interface circuit
US5347544A (en) * 1993-05-03 1994-09-13 Teltrend Inc. Gain or loss compensation circuit for telephone lines
US5357569A (en) * 1993-05-03 1994-10-18 Teltrend Inc. Trans-hybrid loss compensator for on hook transmission
US5422950A (en) * 1993-05-03 1995-06-06 Teltrend Inc. Remote terminal channel unit for telephone transmission lines
ES2105934B1 (en) * 1994-02-25 1998-07-16 Telefonica Nacional Espana Co UNIVERSAL LINE HYBRID CIRCUIT.
US5581201A (en) * 1994-06-30 1996-12-03 Tandem Computers Incorporated Apparatus for unit control and presence detection
US5555301A (en) * 1994-12-21 1996-09-10 Motorola, Inc. Power supply apparatus and method for energizing telephone alerting mechanisms and circuitry
US5737411A (en) * 1994-12-29 1998-04-07 Advanced Micro Devices Inc. Battery switching in a telephone subscriber line interface circuit
US5740241A (en) * 1995-05-12 1998-04-14 Carrier Access Corporation T1 channel bank control process and apparatus
US5721774A (en) * 1995-12-15 1998-02-24 Lucent Technologies Inc. Longitudinally balanced, dual voltage line-feed circuit
US5659608A (en) * 1995-12-15 1997-08-19 Lucent Technologies Inc. Line feed circuit with logic level controlled ringing
DE19611944C2 (en) * 1996-03-26 2003-03-27 Daimler Chrysler Ag Integrated circuit for coupling a micro-controlled control unit to a two-wire bus
US5815569A (en) * 1996-06-27 1998-09-29 Lucent Technologies Inc. Method for controlling power losses associated with line interface circuits in telecommunications networks
JPH1169392A (en) * 1997-08-15 1999-03-09 Nec Corp Station feeding system using exchange subscriber line
US6480510B1 (en) 1998-07-28 2002-11-12 Serconet Ltd. Local area network of serial intelligent cells
DE60019574T2 (en) * 1999-04-22 2006-03-02 Silicon Laboratories, Inc., Austin SUBSCRIBER LINE INTERFACE CIRCUIT
US7180999B1 (en) 1999-04-22 2007-02-20 Silicon Laboratories, Inc. Subscriber line interface circuitry
US6956826B1 (en) 1999-07-07 2005-10-18 Serconet Ltd. Local area network for distributing data communication, sensing and control signals
US6690677B1 (en) 1999-07-20 2004-02-10 Serconet Ltd. Network for telephony and data communication
US6567521B1 (en) * 1999-08-17 2003-05-20 Silicon Laboratories, Inc. Subscriber loop interface circuitry having bifurcated common mode control
US7158633B1 (en) 1999-11-16 2007-01-02 Silicon Laboratories, Inc. Method and apparatus for monitoring subscriber loop interface circuitry power dissipation
US6549616B1 (en) 2000-03-20 2003-04-15 Serconet Ltd. Telephone outlet for implementing a local area network over telephone lines and a local area network using such outlets
US7433665B1 (en) 2000-07-31 2008-10-07 Marvell International Ltd. Apparatus and method for converting single-ended signals to a differential signal, and transceiver employing same
US7113121B1 (en) 2000-05-23 2006-09-26 Marvell International Ltd. Communication driver
US6775529B1 (en) * 2000-07-31 2004-08-10 Marvell International Ltd. Active resistive summer for a transformer hybrid
USRE41831E1 (en) 2000-05-23 2010-10-19 Marvell International Ltd. Class B driver
US7194037B1 (en) 2000-05-23 2007-03-20 Marvell International Ltd. Active replica transformer hybrid
US7312739B1 (en) 2000-05-23 2007-12-25 Marvell International Ltd. Communication driver
US6462688B1 (en) 2000-12-18 2002-10-08 Marvell International, Ltd. Direct drive programmable high speed power digital-to-analog converter
US7095348B1 (en) 2000-05-23 2006-08-22 Marvell International Ltd. Communication driver
US7486787B2 (en) 2000-06-30 2009-02-03 Silicon Laboratories, Inc. Subscriber line interface circuitry with common base audio isolation stage
US7606547B1 (en) 2000-07-31 2009-10-20 Marvell International Ltd. Active resistance summer for a transformer hybrid
US7215764B2 (en) * 2001-02-06 2007-05-08 Legerity, Inc. Current sensing echo cancellation device
IL154234A (en) 2003-01-30 2010-12-30 Mosaid Technologies Inc Method and system for providing dc power on local telephone lines
IL159838A0 (en) 2004-01-13 2004-06-20 Yehuda Binder Information device
US7312662B1 (en) 2005-08-09 2007-12-25 Marvell International Ltd. Cascode gain boosting system and method for a transmitter
US7260212B1 (en) 2007-03-30 2007-08-21 Winbond Electronics Corporation Method and apparatus for subscriber line control circuit
US8150026B2 (en) 2007-06-16 2012-04-03 Winbond Electronics Corporation Method and system for subscriber line interface circuit
US8335310B2 (en) * 2007-06-16 2012-12-18 Nuvoton Technology Corporation Method and system for subscriber line interface circuit having a high-voltage MOS linefeed circuit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2437757A2 (en) * 1978-06-26 1980-04-25 Trt Telecom Radio Electr SUBSCRIBER TRUNK FOR ENSURING TWO-WIRE OR FOUR-WIRE COUPLING WITH A TELEPHONE CENTRAL
US4476350A (en) * 1981-02-17 1984-10-09 Bell Telephone Laboratories, Incorporated Battery feed circuit
US4866768A (en) * 1985-06-26 1989-09-12 Siemens Corporate Research & Support, Inc. Station line interface circuit for a telecommunication network
US4685130A (en) * 1985-08-29 1987-08-04 Gte Communication Systems Corporation Subscriber line circuit having an improved loop current supply circuit
JPH0671295B2 (en) * 1987-04-06 1994-09-07 沖電気工業株式会社 Subscriber line power supply circuit
JP2645022B2 (en) * 1987-08-21 1997-08-25 株式会社東芝 Subscriber circuit
US4864609A (en) * 1988-05-26 1989-09-05 Northern Telecom Limited Telephone line interface circuit
US5014305A (en) * 1989-03-16 1991-05-07 Northern Telecom Limited Line interface circuit

Also Published As

Publication number Publication date
US5175764A (en) 1992-12-29
CA2042683C (en) 1998-10-06

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