IE45750L - Electronic subscriber feeding system - Google Patents

Electronic subscriber feeding system

Info

Publication number
IE45750L
IE45750L IE242877A IE242877A IE45750L IE 45750 L IE45750 L IE 45750L IE 242877 A IE242877 A IE 242877A IE 242877 A IE242877 A IE 242877A IE 45750 L IE45750 L IE 45750L
Authority
IE
Ireland
Prior art keywords
wire
arrangement
loop
current
current generators
Prior art date
Application number
IE242877A
Other versions
IE45750B1 (en
Original Assignee
Deutsche Telephonwerk Kabel
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 Deutsche Telephonwerk Kabel filed Critical Deutsche Telephonwerk Kabel
Publication of IE45750L publication Critical patent/IE45750L/en
Publication of IE45750B1 publication Critical patent/IE45750B1/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)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

The circuit arrangement for an electronic subscriber feed with loop current monitoring, ringing tone connection and hybrid arrangement for the transfer from two-wire to four-wire operation with current generators disposed in a balanced relationship with one another uses operational amplifiers (J1, J2) purely as isolation amplifiers for the current generators. The modulation of the loop current is controlled via the inverted inputs of the operational amplifiers (J1, J2) in such a way that, when the amplification is increased in the modulation arrangement, the dynamic self-balancing of the current generators is increased. When the subscriber loop is open, a differential amplifier (J3) is controlled to achieve a high hybrid loss in such a way that no AC voltage reaches the output (G) on the four-wire side. <IMAGE> [GB1587868A]
IE242877A 1976-12-02 1977-11-30 Circuit arrangement for an electronic subscriber feeding system IE45750B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762655005 DE2655005C3 (en) 1976-12-02 1976-12-02 Circuit arrangement for an electronic subscriber feed

Publications (2)

Publication Number Publication Date
IE45750L true IE45750L (en) 1978-06-02
IE45750B1 IE45750B1 (en) 1982-11-17

Family

ID=5994663

Family Applications (1)

Application Number Title Priority Date Filing Date
IE242877A IE45750B1 (en) 1976-12-02 1977-11-30 Circuit arrangement for an electronic subscriber feeding system

Country Status (13)

Country Link
AT (1) AT363523B (en)
BE (1) BE861297A (en)
CA (1) CA1111586A (en)
CH (1) CH630209A5 (en)
DE (1) DE2655005C3 (en)
DK (1) DK533777A (en)
FR (1) FR2373201A1 (en)
GB (1) GB1587868A (en)
IE (1) IE45750B1 (en)
IT (1) IT1088708B (en)
LU (1) LU78546A1 (en)
NL (1) NL7713305A (en)
SE (1) SE7713728L (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4203009A (en) * 1977-08-17 1980-05-13 The Post Office Unbalanced/balanced converter circuits
NL7810086A (en) * 1978-10-06 1980-04-09 Philips Nv POWER BRIDGE FOR A SUBSCRIBER FLOW.
DE3014187C2 (en) * 1980-04-14 1983-11-17 Nixdorf Computer Ag, 4790 Paderborn Circuit arrangement for the two-wire connection of a telephone subscriber to one line each for incoming and incoming signals
DE3032970C2 (en) * 1980-09-02 1987-04-16 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Circuit arrangement for symmetrizing the operating points of electronically DC-fed connecting lines in telecommunications systems, in particular telephone exchanges
DE3116783C2 (en) * 1981-04-28 1983-09-01 Standard Elektrik Lorenz Ag, 7000 Stuttgart Circuit arrangement for a subscriber line circuit for telephone systems
US4431868A (en) * 1981-07-09 1984-02-14 International Telephone And Telegraph Corporation Solid state telephone line interface circuit with ringing capability
DE3138726A1 (en) * 1981-09-29 1983-04-07 Siemens AG, 1000 Berlin und 8000 München Subscriber connection circuit for connecting two-wire subscriber connection lines to a four-wire through-connecting digital time division multiplex exchange
DE3214624C2 (en) * 1982-04-20 1986-05-28 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for evaluating subscriber loop states in telephone systems, in particular in telephone branch exchange systems
BR8401869A (en) * 1984-04-23 1985-11-26 Microlab Sa VOICE FREQUENCY REPEATER
FR2564678B1 (en) * 1984-05-18 1986-09-12 Thomson Csf Mat Tel SUBSCRIBER CIRCUIT LINK INTERFACE FOR TELEPHONE SWITCH
DE4306251C1 (en) * 1993-03-01 1994-06-01 Bosch Telecom Telecommunication system user connection line circuitry - indicates status of telephone user connection line according to call signal which switches transistor connected to operational amplifier inputs

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH586983A5 (en) * 1974-12-23 1977-04-15 Ibm
DE2556157C3 (en) * 1975-12-11 1979-01-18 Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin Circuit arrangement for an electronic subscriber feed

Also Published As

Publication number Publication date
IT1088708B (en) 1985-06-10
GB1587868A (en) 1981-04-08
IE45750B1 (en) 1982-11-17
DK533777A (en) 1978-06-03
DE2655005A1 (en) 1978-06-15
NL7713305A (en) 1978-06-06
DE2655005C3 (en) 1980-04-17
CA1111586A (en) 1981-10-27
BE861297A (en) 1978-03-16
CH630209A5 (en) 1982-05-28
DE2655005B2 (en) 1979-08-09
FR2373201A1 (en) 1978-06-30
LU78546A1 (en) 1978-04-13
ATA860777A (en) 1981-01-15
AT363523B (en) 1981-08-10
SE7713728L (en) 1978-06-03

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