GB1478219A - Telecommunication exchange circuits - Google Patents

Telecommunication exchange circuits

Info

Publication number
GB1478219A
GB1478219A GB715875A GB715875A GB1478219A GB 1478219 A GB1478219 A GB 1478219A GB 715875 A GB715875 A GB 715875A GB 715875 A GB715875 A GB 715875A GB 1478219 A GB1478219 A GB 1478219A
Authority
GB
United Kingdom
Prior art keywords
wire
circuit
hall effect
effect element
current
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
GB715875A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB715875A priority Critical patent/GB1478219A/en
Priority to BR7507715*A priority patent/BR7507715A/en
Priority to NO760488A priority patent/NO144404C/en
Priority to IT20225/76A priority patent/IT1055300B/en
Priority to BE2054835A priority patent/BE838697A/en
Priority to FR7604734A priority patent/FR2301982A1/en
Priority to ES445388A priority patent/ES445388A1/en
Publication of GB1478219A publication Critical patent/GB1478219A/en
Expired legal-status Critical Current

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)

Abstract

1478219 Current monitoring STANDARD TELEPHONES & CABLES Ltd 20 Feb 1975 7158/75 Heading G1U [Also in Division H4K] A circuit for indicating the presence of a D.C. current in a wire includes a Hall Effect element 2 positioned in an air gap of a magnetic circuit, the primary winding 1 of the device being connected in series with the wire to be monitored. The D.C. bias supply for the Hall Effect element is pulsed and if the magnetic circuit is saturated due to a D.C. current flowing in the winding 1, an output pulse is produced across the elements output terminals. If the wire is found to be carrying D.C. on four successive pulsings, a bi-stable circuit is set to give a 'D.C. present' indication. Integrated circuitry and a programmed microprocessor may be used for controlling the pulsing operation and the analysis of the result, Figs. 5 and 7 (not shown), the micro-processor supervising a plurality of indicating circuits. The arrangement is applied to loop detectors in a telephone exchange (Divisions H3-5).
GB715875A 1975-02-20 1975-02-20 Telecommunication exchange circuits Expired GB1478219A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB715875A GB1478219A (en) 1975-02-20 1975-02-20 Telecommunication exchange circuits
BR7507715*A BR7507715A (en) 1975-02-20 1975-11-21 IMPROVEMENTS RELATING TO CIRCUITS OF TELECOMMUNICATIONS STATIONS
NO760488A NO144404C (en) 1975-02-20 1976-02-16 DETECTOR.
IT20225/76A IT1055300B (en) 1975-02-20 1976-02-17 IMPROVEMENT IN CIRCUITS FOR TELECOMMUNICATIONS CENTRAL
BE2054835A BE838697A (en) 1975-02-20 1976-02-19 TELECOMMUNICATION CIRCUITS AND ORGANS USING HALL EFFECT DEVICES
FR7604734A FR2301982A1 (en) 1975-02-20 1976-02-20 STATE CHANGE DETECTOR CIRCUIT OF A TELEPHONE LINE
ES445388A ES445388A1 (en) 1975-02-20 1976-02-20 Telecommunication exchange circuits

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
GB1478219A true GB1478219A (en) 1977-06-29

Family

ID=9827726

Family Applications (1)

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

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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146872A (en) * 1983-09-15 1985-04-24 Stc Plc Hall effect module for loop detector

Families Citing this family (2)

* 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
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146872A (en) * 1983-09-15 1985-04-24 Stc Plc Hall effect module for loop detector

Also Published As

Publication number Publication date
ES445388A1 (en) 1977-06-16
IT1055300B (en) 1981-12-21
NO144404B (en) 1981-05-11
NO760488L (en) 1976-09-01
BR7507715A (en) 1976-08-24
NO144404C (en) 1981-08-19
FR2301982A1 (en) 1976-09-17
BE838697A (en) 1976-08-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee