SE7910670L - TWO-WIRELESS CIRCUIT FOR TELEPHONE CONNECTIONS - Google Patents

TWO-WIRELESS CIRCUIT FOR TELEPHONE CONNECTIONS

Info

Publication number
SE7910670L
SE7910670L SE7910670A SE7910670A SE7910670L SE 7910670 L SE7910670 L SE 7910670L SE 7910670 A SE7910670 A SE 7910670A SE 7910670 A SE7910670 A SE 7910670A SE 7910670 L SE7910670 L SE 7910670L
Authority
SE
Sweden
Prior art keywords
impedance
output
wire
wireless circuit
telephone connections
Prior art date
Application number
SE7910670A
Other languages
Unknown language ( )
Swedish (sv)
Inventor
J S Arnold
Original Assignee
Plessey Handel Investment Ag
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 Plessey Handel Investment Ag filed Critical Plessey Handel Investment Ag
Publication of SE7910670L publication Critical patent/SE7910670L/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/581—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using a transformer
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephone Function (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

In a 2/4 wire converter the 2 wire line is isolated from the electronic circuits by means of a transformer T, which also performs the function of a hybrid circuit. The 2 wire terminating impedance Zt also serves as the line current feed. In order to avoid shunting this impedance by the amplifiers A1 and A2, it is necessary to make the input impedance of A1 and the output impedance of A2 relatively high. A conventional way of achieving a high output impedance for A2 is to arrange the internal feedback circuits to give a current output rather than the more usual voltage output. <IMAGE>
SE7910670A 1978-12-30 1979-12-27 TWO-WIRELESS CIRCUIT FOR TELEPHONE CONNECTIONS SE7910670L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7850384A GB2042848B (en) 1978-12-30 1978-12-30 Line current feed and hybrid arrangement (sytem x)

Publications (1)

Publication Number Publication Date
SE7910670L true SE7910670L (en) 1980-07-01

Family

ID=10502016

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7910670A SE7910670L (en) 1978-12-30 1979-12-27 TWO-WIRELESS CIRCUIT FOR TELEPHONE CONNECTIONS

Country Status (11)

Country Link
JP (1) JPS5593363A (en)
AU (1) AU5323179A (en)
BR (1) BR7907891A (en)
DE (1) DE2952259A1 (en)
FR (1) FR2445666A1 (en)
GB (1) GB2042848B (en)
IE (1) IE48895B1 (en)
NL (1) NL7909148A (en)
NZ (1) NZ192462A (en)
SE (1) SE7910670L (en)
ZA (1) ZA796287B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007791A1 (en) * 1980-02-29 1981-09-10 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR INCREASING THE INDUCTIVITY OF A TRANSMITTER
DE3278899D1 (en) * 1981-04-06 1988-09-15 Northern Telecom Ltd Apparatus for coupling signals to or from a two-wire line
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
FR2552288B1 (en) * 1983-09-15 1989-03-24 Telecommunications Sa TELEPHONE SUBSCRIBER
US4595802A (en) * 1983-11-29 1986-06-17 Northern Telecom Limited Hybrid circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063475A5 (en) * 1969-10-17 1971-07-09 Labo Cent Telecommunicat
FR2131038A5 (en) * 1971-03-30 1972-11-10 Ass Ouvriers Instr Preci
FR2166696A5 (en) * 1972-01-04 1973-08-17 Ass Ouvriers Instr Preci
US3955052A (en) * 1974-11-18 1976-05-04 Tadiran Israel Electronics Industries Ltd. Subscriber unit particularly useful for time-division-multiplex system

Also Published As

Publication number Publication date
NZ192462A (en) 1982-05-25
AU5323179A (en) 1980-07-03
JPS5593363A (en) 1980-07-15
FR2445666B1 (en) 1984-10-12
GB2042848A (en) 1980-09-24
FR2445666A1 (en) 1980-07-25
NL7909148A (en) 1980-07-02
IE792528L (en) 1980-06-30
ZA796287B (en) 1980-11-26
DE2952259A1 (en) 1980-07-17
BR7907891A (en) 1980-07-29
IE48895B1 (en) 1985-06-12
GB2042848B (en) 1983-01-06

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