BR7507715A - Aperfeicoamentos relativos a circuitos de estacoes de telecomunicacoes - Google Patents

Aperfeicoamentos relativos a circuitos de estacoes de telecomunicacoes

Info

Publication number
BR7507715A
BR7507715A BR7507715*A BR7507715A BR7507715A BR 7507715 A BR7507715 A BR 7507715A BR 7507715 A BR7507715 A BR 7507715A BR 7507715 A BR7507715 A BR 7507715A
Authority
BR
Brazil
Prior art keywords
circuits
improvements relating
telecommunications stations
telecommunications
stations
Prior art date
Application number
BR7507715*A
Other languages
English (en)
Portuguese (pt)
Inventor
R Kitajewski
A Sweet
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of BR7507715A publication Critical patent/BR7507715A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Control Of Eletrric Generators (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Spectrometry And Color Measurement (AREA)
BR7507715*A 1975-02-20 1975-11-21 Aperfeicoamentos relativos a circuitos de estacoes de telecomunicacoes BR7507715A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB715875A GB1478219A (en) 1975-02-20 1975-02-20 Telecommunication exchange circuits

Publications (1)

Publication Number Publication Date
BR7507715A true BR7507715A (pt) 1976-08-24

Family

ID=9827726

Family Applications (1)

Application Number Title Priority Date Filing Date
BR7507715*A BR7507715A (pt) 1975-02-20 1975-11-21 Aperfeicoamentos relativos a circuitos de estacoes de telecomunicacoes

Country Status (7)

Country Link
BE (1) BE838697A (no)
BR (1) BR7507715A (no)
ES (1) ES445388A1 (no)
FR (1) FR2301982A1 (no)
GB (1) GB1478219A (no)
IT (1) IT1055300B (no)
NO (1) NO144404C (no)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2013000A (en) * 1978-01-20 1979-08-01 Hitachi Ltd Dc D.C. magnetic field cancellation circuit
GB2146872B (en) * 1983-09-15 1986-11-05 Stc Plc Hall effect module for loop detector
US5333192A (en) * 1990-06-26 1994-07-26 Northern Telecom Limited Line interface circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1158584B (de) * 1962-08-16 1963-12-05 Telefunken Patent Schaltungsanordnung zur Pruefung des Anruf- und Belegungszustandes der Teilnehmerleitungen in Fernmelde-, insbesondere Fernsprechvermittlungsanlagen mit Hilfe von Hall-Generatoren
US3848094A (en) * 1972-12-29 1974-11-12 Stromberg Carlson Corp Telephone battery feed circuit

Also Published As

Publication number Publication date
ES445388A1 (es) 1977-06-16
IT1055300B (it) 1981-12-21
NO144404B (no) 1981-05-11
NO760488L (no) 1976-09-01
NO144404C (no) 1981-08-19
FR2301982A1 (fr) 1976-09-17
GB1478219A (en) 1977-06-29
BE838697A (fr) 1976-08-19

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