FR2439998A1 - APPARATUS FOR MONITORING LINE CURRENT IN A TELEPHONE LINE - Google Patents

APPARATUS FOR MONITORING LINE CURRENT IN A TELEPHONE LINE

Info

Publication number
FR2439998A1
FR2439998A1 FR7926129A FR7926129A FR2439998A1 FR 2439998 A1 FR2439998 A1 FR 2439998A1 FR 7926129 A FR7926129 A FR 7926129A FR 7926129 A FR7926129 A FR 7926129A FR 2439998 A1 FR2439998 A1 FR 2439998A1
Authority
FR
France
Prior art keywords
comparators
line
telephone
telephone line
line 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.)
Granted
Application number
FR7926129A
Other languages
French (fr)
Other versions
FR2439998B1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of FR2439998A1 publication Critical patent/FR2439998A1/en
Application granted granted Critical
Publication of FR2439998B1 publication Critical patent/FR2439998B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H04M1/654—Telephone line monitoring circuits therefor, e.g. ring detectors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

APPAREIL DE CONTROLE DU COURANT DE LIGNE DANS UNE LIGNE TELEPHONIQUE. DEUX COMPARATEURS 7, 8 SONT BRANCHES SUR UNE RESISTANCE DE MESURE SERIE 3 MONTEE DANS UN FIL 4 D'UNE LIGNE TELEPHONIQUE. LES POTENTIELS DE REFERENCE DES COMPARATEURS 7, 8 SONT PRELEVES SUR UN DIVISEUR DE TENSION 12, DE FACON QUE LES COMPARATEURS 7 ET 8 REAGISSENT SYMETRIQUEMENT, LE PREMIER AUX COURANTS POSITIFS ET LE SECOND AUX COURANTS NEGATIFS. LES SORTIES DES DEUX COMPARATEURS 7, 8 SONT RELIEES A UN COUPLEUR OPTIQUE 24 QUI TRANSMET ISOLEMENT UN SIGNAL DE MESURE A UN DISPOSITIF DE TRAITEMENT. APPLICATIONS: CONTROLE-COMMANDE DU COURANT DE LIGNE POSITIF OU NEGATIF DES LIGNES TELEPHONIQUES AVEC INTRODUCTION DE QUELQUES OHMS SEULEMENT DANS LE CABLE ET AVEC SEPARATION GALVANIQUE PARFAITE.LINE CURRENT CONTROL DEVICE IN A TELEPHONE LINE. TWO COMPARATORS 7, 8 ARE CONNECTED TO A SERIES 3 MEASURING RESISTOR MOUNTED IN A WIRE 4 OF A TELEPHONE LINE. THE REFERENCE POTENTIALS OF COMPARATORS 7, 8 ARE TAKEN FROM A VOLTAGE DIVIDER 12, SO THAT COMPARATORS 7 AND 8 REACT SYMMETRICALLY, THE FIRST TO POSITIVE CURRENTS AND THE SECOND TO NEGATIVE CURRENTS. THE OUTPUTS OF THE TWO COMPARATORS 7, 8 ARE CONNECTED TO AN OPTICAL COUPLER 24 WHICH ISOLATELY TRANSMITS A MEASUREMENT SIGNAL TO A PROCESSING DEVICE. APPLICATIONS: CONTROL-COMMAND OF THE POSITIVE OR NEGATIVE LINE CURRENT OF TELEPHONE LINES WITH INTRODUCTION OF SOME OHMS ONLY IN THE CABLE AND WITH PERFECT GALVANIC SEPARATION.

FR7926129A 1978-10-25 1979-10-22 APPARATUS FOR MONITORING LINE CURRENT IN A TELEPHONE LINE Granted FR2439998A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1102078A CH635216A5 (en) 1978-10-25 1978-10-25 DEVICE FOR MONITORING THE LINE CURRENT IN A TELEPHONE LINE.

Publications (2)

Publication Number Publication Date
FR2439998A1 true FR2439998A1 (en) 1980-05-23
FR2439998B1 FR2439998B1 (en) 1983-04-15

Family

ID=4369220

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7926129A Granted FR2439998A1 (en) 1978-10-25 1979-10-22 APPARATUS FOR MONITORING LINE CURRENT IN A TELEPHONE LINE

Country Status (5)

Country Link
CH (1) CH635216A5 (en)
DE (1) DE2942440A1 (en)
FR (1) FR2439998A1 (en)
GB (1) GB2035753B (en)
SE (1) SE7908436L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3141661A1 (en) * 1981-10-21 1983-05-05 Brown, Boveri & Cie Ag, 6800 Mannheim Device for monitoring circuits
EP0165363A1 (en) * 1984-06-20 1985-12-27 International Business Machines Corporation Detection circuit for current varations
WO1996031931A1 (en) * 1995-04-07 1996-10-10 Norcel Limited A.c. power cut-off device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3245839A1 (en) * 1982-11-05 1984-05-10 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Circuit arrangement for identifying a loop state
DE3400304A1 (en) * 1982-11-05 1985-07-11 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Circuit for identifying a loop condition
DE3332893C2 (en) * 1983-09-13 1985-08-22 Telecommunication Vertriebsgesellschaft mbH, 6000 Frankfurt Device for loop current detection in telecommunications networks
DE3741072A1 (en) * 1987-12-04 1989-06-15 Standard Elektrik Lorenz Ag Circuit arrangement for detecting an incoming call in a telephone set

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT315248B (en) * 1971-09-20 1974-05-10 Kapsch Telephon Telegraph Circuit arrangement for the office or subscriber side monitoring of the loop status in telephone systems
US4054941A (en) * 1976-12-22 1977-10-18 Bell Telephone Laboratories, Incorporated Range extender with gain

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1260552B (en) * 1965-02-15 1968-02-08 Telefonbau Relayless subscriber connection circuit for telephone systems
BE754235A (en) * 1969-08-05 1970-12-31 Western Electric Co SUPERVISION CIRCUIT FOR TELEPHONE LINES
DE1950672C3 (en) * 1969-10-08 1975-05-15 Friedrich Merk Telefonbau Gmbh, 8000 Muenchen Circuit arrangement for ringing current connection and output monitoring in connection sets of telephone systems
FR2251975B1 (en) * 1973-11-16 1979-08-03 Labo Cent Telecommunicat

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT315248B (en) * 1971-09-20 1974-05-10 Kapsch Telephon Telegraph Circuit arrangement for the office or subscriber side monitoring of the loop status in telephone systems
US4054941A (en) * 1976-12-22 1977-10-18 Bell Telephone Laboratories, Incorporated Range extender with gain

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/74 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3141661A1 (en) * 1981-10-21 1983-05-05 Brown, Boveri & Cie Ag, 6800 Mannheim Device for monitoring circuits
EP0165363A1 (en) * 1984-06-20 1985-12-27 International Business Machines Corporation Detection circuit for current varations
WO1996031931A1 (en) * 1995-04-07 1996-10-10 Norcel Limited A.c. power cut-off device

Also Published As

Publication number Publication date
GB2035753A (en) 1980-06-18
DE2942440A1 (en) 1980-05-08
DE2942440C2 (en) 1988-01-21
FR2439998B1 (en) 1983-04-15
SE7908436L (en) 1980-04-26
CH635216A5 (en) 1983-03-15
GB2035753B (en) 1982-11-10

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Legal Events

Date Code Title Description
ST Notification of lapse