IT1055300B - IMPROVEMENT IN CIRCUITS FOR TELECOMMUNICATIONS CENTRAL - Google Patents

IMPROVEMENT IN CIRCUITS FOR TELECOMMUNICATIONS CENTRAL

Info

Publication number
IT1055300B
IT1055300B IT20225/76A IT2022576A IT1055300B IT 1055300 B IT1055300 B IT 1055300B IT 20225/76 A IT20225/76 A IT 20225/76A IT 2022576 A IT2022576 A IT 2022576A IT 1055300 B IT1055300 B IT 1055300B
Authority
IT
Italy
Prior art keywords
circuits
improvement
telecommunications central
telecommunications
central
Prior art date
Application number
IT20225/76A
Other languages
Italian (it)
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
Application granted granted Critical
Publication of IT1055300B publication Critical patent/IT1055300B/en

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)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Control Of Eletrric Generators (AREA)
IT20225/76A 1975-02-20 1976-02-17 IMPROVEMENT IN CIRCUITS FOR TELECOMMUNICATIONS CENTRAL IT1055300B (en)

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
IT1055300B true IT1055300B (en) 1981-12-21

Family

ID=9827726

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20225/76A IT1055300B (en) 1975-02-20 1976-02-17 IMPROVEMENT IN CIRCUITS FOR TELECOMMUNICATIONS CENTRAL

Country Status (7)

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

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 (en) * 1962-08-16 1963-12-05 Telefunken Patent Circuit arrangement for checking the call and occupancy status of subscriber lines in telecommunication systems, in particular telephone switching systems, with the aid of Hall generators
US3848094A (en) * 1972-12-29 1974-11-12 Stromberg Carlson Corp Telephone battery feed circuit

Also Published As

Publication number Publication date
NO760488L (en) 1976-09-01
ES445388A1 (en) 1977-06-16
NO144404B (en) 1981-05-11
GB1478219A (en) 1977-06-29
NO144404C (en) 1981-08-19
BE838697A (en) 1976-08-19
FR2301982A1 (en) 1976-09-17
BR7507715A (en) 1976-08-24

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