SE0102281L - Device for overcurrent protection of line drivers - Google Patents

Device for overcurrent protection of line drivers

Info

Publication number
SE0102281L
SE0102281L SE0102281A SE0102281A SE0102281L SE 0102281 L SE0102281 L SE 0102281L SE 0102281 A SE0102281 A SE 0102281A SE 0102281 A SE0102281 A SE 0102281A SE 0102281 L SE0102281 L SE 0102281L
Authority
SE
Sweden
Prior art keywords
current
transmission line
input
line drivers
attenuator
Prior art date
Application number
SE0102281A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE0102281D0 (en
SE519314C2 (en
Inventor
Henrik Hellberg
Anders Emericks
Ulf Lundin
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE0102281A priority Critical patent/SE519314C2/en
Publication of SE0102281D0 publication Critical patent/SE0102281D0/en
Priority to TW90128107A priority patent/TW546883B/en
Priority to PCT/SE2002/001130 priority patent/WO2003001786A1/en
Publication of SE0102281L publication Critical patent/SE0102281L/en
Publication of SE519314C2 publication Critical patent/SE519314C2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

In a SLIC (1), line drivers (2,3) are connected with their inputs to respective outputs of a controllable current attenuator (6) whose input is supplied with transversal currents to be transmitted onto the transmission line (A,B), and with their outputs to respective wire of a two-wire transmission line (A,B). Means (4,9,10) are provided to detect any longitudinal currents on the transmission line (A,B) and to generate a current (I5,I6) to the inputs of the line drivers (2,3), that is proportional to a detected longitudinal current to counteract the same . Said means (4,9,10) is connected to a first input of a current comparator (5) having s second input connected to a reference current generator (7), and an output connected to a control input of the current attenuator (6). The current comparator (5) generates currents (I3) to control the current attenuator (6) to increase its attenuation when the current (I4) proportional to any longitudinal current on the transmission line exceeds the reference current (I9).
SE0102281A 2001-06-21 2001-06-21 Device for overcurrent protection of line drivers SE519314C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE0102281A SE519314C2 (en) 2001-06-21 2001-06-21 Device for overcurrent protection of line drivers
TW90128107A TW546883B (en) 2001-06-21 2001-11-13 An arrangement for overcurrent protection of line drivers
PCT/SE2002/001130 WO2003001786A1 (en) 2001-06-21 2002-06-11 An arrangement for overcurrent protection of line drivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0102281A SE519314C2 (en) 2001-06-21 2001-06-21 Device for overcurrent protection of line drivers

Publications (3)

Publication Number Publication Date
SE0102281D0 SE0102281D0 (en) 2001-06-21
SE0102281L true SE0102281L (en) 2002-12-22
SE519314C2 SE519314C2 (en) 2003-02-11

Family

ID=20284631

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0102281A SE519314C2 (en) 2001-06-21 2001-06-21 Device for overcurrent protection of line drivers

Country Status (3)

Country Link
SE (1) SE519314C2 (en)
TW (1) TW546883B (en)
WO (1) WO2003001786A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8302673D0 (en) * 1983-02-01 1983-03-02 Motorola Inc Borsht/slic auto balancing technique
EP0622943B1 (en) * 1993-04-30 2001-09-12 STMicroelectronics S.r.l. Power management circuit for a subscriber line interface circuit
SE502493C2 (en) * 1994-09-20 1995-10-30 Ericsson Telefon Ab L M Method and apparatus for determining the deviation of longitudinal signal components from a predetermined value
US5649009A (en) * 1994-11-14 1997-07-15 Harris Corporation Differential longitudinal amplifier for a subscriber line interface circuit

Also Published As

Publication number Publication date
SE0102281D0 (en) 2001-06-21
WO2003001786A1 (en) 2003-01-03
SE519314C2 (en) 2003-02-11
TW546883B (en) 2003-08-11

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Legal Events

Date Code Title Description
NUG Patent has lapsed
NUG Patent has lapsed