ES374943A1 - Telecommunication substation with equalised transmission - Google Patents

Telecommunication substation with equalised transmission

Info

Publication number
ES374943A1
ES374943A1 ES374943A ES374943A ES374943A1 ES 374943 A1 ES374943 A1 ES 374943A1 ES 374943 A ES374943 A ES 374943A ES 374943 A ES374943 A ES 374943A ES 374943 A1 ES374943 A1 ES 374943A1
Authority
ES
Spain
Prior art keywords
substation
circuit
series
compensation
diodes
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
ES374943A
Other languages
Spanish (es)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES374943A1 publication Critical patent/ES374943A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/76—Compensating for differences in line impedance

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Gain of a microphone amplifier T 1 , T 2 in a substation circuit is controlled in dependence on the length of the line to which the circuit is connected by an assembly of diodes D 7 , D 8 connected in series with the balancing network R 1 , R 2 , C 1 , of the substation hybrid, and arranged to shunt the emitter base circuit of the transistor T 2 . C 3 provides for the diode assemblies D 7 and D 8 , which are in series for D.C., to be in parallel in respect of A.C. in the microphone amplifier circuit. Compensation of receiver signal level with line length is provided by the assembly of diodes D 5 , D 6 , which are in series with the D.C. flowing to the substation and also form arms of a bridge circuit feeding the receiver REC. Thermistors TH 1 and TH 2 are provided for temperature compensation. The arrangement of the diode D 6 and Do or D 7 and D 8 in opposed parallel arrangement as regards A.C. provides compensation of their non linearity with signal level.
ES374943A 1968-12-27 1969-12-26 Telecommunication substation with equalised transmission Expired ES374943A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE726061 1968-12-27

Publications (1)

Publication Number Publication Date
ES374943A1 true ES374943A1 (en) 1972-02-16

Family

ID=3854022

Family Applications (1)

Application Number Title Priority Date Filing Date
ES374943A Expired ES374943A1 (en) 1968-12-27 1969-12-26 Telecommunication substation with equalised transmission

Country Status (6)

Country Link
BE (1) BE726061A (en)
ES (1) ES374943A1 (en)
FR (1) FR2027214A1 (en)
GB (1) GB1241268A (en)
IL (1) IL33605A (en)
NL (1) NL6919249A (en)

Also Published As

Publication number Publication date
NL6919249A (en) 1970-06-30
FR2027214A1 (en) 1970-09-25
IL33605A0 (en) 1970-02-19
BE726061A (en) 1969-06-27
IL33605A (en) 1973-05-31
GB1241268A (en) 1971-08-04

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