GB410108A - Improvements in cord-circuit repeaters for use in telephone systems - Google Patents

Improvements in cord-circuit repeaters for use in telephone systems

Info

Publication number
GB410108A
GB410108A GB31387/32A GB3138732A GB410108A GB 410108 A GB410108 A GB 410108A GB 31387/32 A GB31387/32 A GB 31387/32A GB 3138732 A GB3138732 A GB 3138732A GB 410108 A GB410108 A GB 410108A
Authority
GB
United Kingdom
Prior art keywords
cord
circuit
junctions
nov
sections
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
GB31387/32A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB410108A publication Critical patent/GB410108A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Attenuators (AREA)
  • Amplifiers (AREA)

Abstract

410,108. Manual exchange systems. TELEFONAKTIEBOLAGET L. M. ERICSSON, 33, Kungsgatan, Stockholm. Nov. 7, 1932, No. 31387. Convention date, Nov. 10, 1931. [Class 40 (iv).] Impedance networks associated with an amplifying cord-circuit are varied in accordance with the characteristics of the junctions to which the cord-circuit is connected by pairs of relays D1, E1 ; D2, E2, connected in series between opposite poles of battery and controlled over junction-jack springs K which are connected to positive or negative potential or are insulated in accordance with the lengths of the junctions. The network in each path comprises four sections each having series and shunt resistance, the impedance of two of the sections G1, G2, being different from that of the other two H1, H2.
GB31387/32A 1931-11-10 1932-11-07 Improvements in cord-circuit repeaters for use in telephone systems Expired GB410108A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE410108X 1931-11-10

Publications (1)

Publication Number Publication Date
GB410108A true GB410108A (en) 1934-05-07

Family

ID=20309543

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31387/32A Expired GB410108A (en) 1931-11-10 1932-11-07 Improvements in cord-circuit repeaters for use in telephone systems

Country Status (4)

Country Link
DE (1) DE604026C (en)
FR (1) FR745190A (en)
GB (1) GB410108A (en)
NL (1) NL34700C (en)

Also Published As

Publication number Publication date
FR745190A (en) 1933-05-06
DE604026C (en) 1934-10-16
NL34700C (en)

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