GB1059014A - Circuit arrangement for feeding subscriber stations in telecommunication systems, particularly telephone systems - Google Patents

Circuit arrangement for feeding subscriber stations in telecommunication systems, particularly telephone systems

Info

Publication number
GB1059014A
GB1059014A GB2119065A GB2119065A GB1059014A GB 1059014 A GB1059014 A GB 1059014A GB 2119065 A GB2119065 A GB 2119065A GB 2119065 A GB2119065 A GB 2119065A GB 1059014 A GB1059014 A GB 1059014A
Authority
GB
United Kingdom
Prior art keywords
transistors
systems
emitter
circuit arrangement
subscriber stations
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.)
Expired
Application number
GB2119065A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1059014A publication Critical patent/GB1059014A/en
Expired 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
    • 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)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1,059,014. Automatic exchange equipment. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. May 19, 1965 [May 21, 1964], No. 21190/65. Heading H4K. Line current from the exchange battery is supplied to each wire of a subscriber's line through the emitter-collector path of one of a pair of transistors whose emitters are connected to one and the other poles of the battery and by means of adjusting the working point of the transistors the additional attenuation created in the transmission path by this feed circuit can be made symmetrical. The transistors are turned off when the D.C. loop is opened. Diodes connected to the bases of the transistors have temperature response characteristics the same as those of the base-emitter diode of the transistors to stabilize the working point of the transistors against temperature fluctuations. The voltage across a resistance in one emitter path is monitored to detect changes in the line condition.
GB2119065A 1964-05-21 1965-05-19 Circuit arrangement for feeding subscriber stations in telecommunication systems, particularly telephone systems Expired GB1059014A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET26230A DE1199827B (en) 1964-05-21 1964-05-21 Circuit arrangement for the supply of the subscriber stations in telecommunication systems, especially telephone systems

Publications (1)

Publication Number Publication Date
GB1059014A true GB1059014A (en) 1967-02-15

Family

ID=7552627

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2119065A Expired GB1059014A (en) 1964-05-21 1965-05-19 Circuit arrangement for feeding subscriber stations in telecommunication systems, particularly telephone systems

Country Status (4)

Country Link
AT (1) AT250454B (en)
CH (1) CH420283A (en)
DE (1) DE1199827B (en)
GB (1) GB1059014A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2343383A1 (en) * 1976-03-05 1977-09-30 Philips Nv SUPPLY BRIDGE

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2326091A1 (en) * 1975-09-23 1977-04-22 Labo Cent Telecommunicat Telephone terminal telesupply unit - is connected to telephone line and can supply current from two sources
IT1159706B (en) * 1978-06-02 1987-03-04 Cselt Centro Studi Lab Telecom USER LINE ELECTRONIC TELEPHONE CIRCUIT
DE2838038A1 (en) * 1978-08-31 1980-03-13 Siemens Ag Input circuit for telephone wire connection - has transistors, connected via collectors, to two wire and via transformer to four wire cable with supply to base and emitters
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
DE3037972C2 (en) * 1980-10-08 1982-09-16 Standard Elektrik Lorenz Ag, 7000 Stuttgart Circuit arrangement for feeding a variable resistor via two variable feeding resistors, in particular for feeding subscriber lines in telephone exchanges

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2343383A1 (en) * 1976-03-05 1977-09-30 Philips Nv SUPPLY BRIDGE

Also Published As

Publication number Publication date
CH420283A (en) 1966-09-15
AT250454B (en) 1966-11-10
DE1199827B (en) 1965-09-02

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