GB1233955A - - Google Patents

Info

Publication number
GB1233955A
GB1233955A GB1233955DA GB1233955A GB 1233955 A GB1233955 A GB 1233955A GB 1233955D A GB1233955D A GB 1233955DA GB 1233955 A GB1233955 A GB 1233955A
Authority
GB
United Kingdom
Prior art keywords
line
shunt
capacitor
network
indicate
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
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 filed Critical
Publication of GB1233955A publication Critical patent/GB1233955A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/738Interface circuits for coupling substations to external telephone lines
    • H04M1/74Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1,233,955. Substation circuits; line balancing networks. SOC. ITALIANA TELECOMUNICAZIONI SIEMENS S.p.A. 11 Oct., 1968 [23 Oct., 1967], No. 48298/68. Headings H4K and H4R. A subset incorporating a hybrid transformer is matched to line by means of a capacitive network such that the reactance of the set plus network is a minimum at the high frequency end of the speech band. The normal characteristics of a subset and a line are depicted in Fig. 1 where curves 1, I<SP>1</SP> and 2, 2<SP>1</SP> indicate the characteristics with respect to frequency of the resistive and reactive components of lines using 26 and 22 gauge conductors respectively and Ra, jxa indicate the similar characteristics for a set. A mathematical discussion shows that by capacitively loading the essentially inductive set a good match with an essentially capacitive line can be obtained in respect of both resistive and reactive components. Fig. 2 shows the improved characteristics obtained by using a parallel RC network across the line and the remaining Figures (not shown) indicate the similar improvements obtained by using: a single shunt capacitor; a series RC network in shunt with the line; a parallel RC network in series with a capacitor across the line; a capacitor in shunt with transformer winding I or transformer windings I and III (Figs. 6, 7, not shown); a capacitor or a resistor in shunt with the line and another capacitor in shunt with winding I; and a series RC network across the line with a capacitor in shunt with winding I (Fig. 10, not shown).
GB1233955D 1967-10-23 1968-10-11 Expired GB1233955A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT814782 1967-10-23

Publications (1)

Publication Number Publication Date
GB1233955A true GB1233955A (en) 1971-06-03

Family

ID=11125950

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1233955D Expired GB1233955A (en) 1967-10-23 1968-10-11

Country Status (1)

Country Link
GB (1) GB1233955A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146505A (en) * 1983-07-15 1985-04-17 Standard Telephones Cables Ltd Impedance matching circuit
GB2154831A (en) * 1983-06-29 1985-09-11 Standard Telephones Cables Ltd Impedance matching circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154831A (en) * 1983-06-29 1985-09-11 Standard Telephones Cables Ltd Impedance matching circuit
GB2146505A (en) * 1983-07-15 1985-04-17 Standard Telephones Cables Ltd Impedance matching circuit

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee