FR2324181A1 - Telephone line loop detector - has resistor bridge and amplifier to/ operating state of line connected to determine exchange or switchboard - Google Patents

Telephone line loop detector - has resistor bridge and amplifier to/ operating state of line connected to determine exchange or switchboard

Info

Publication number
FR2324181A1
FR2324181A1 FR7528088A FR7528088A FR2324181A1 FR 2324181 A1 FR2324181 A1 FR 2324181A1 FR 7528088 A FR7528088 A FR 7528088A FR 7528088 A FR7528088 A FR 7528088A FR 2324181 A1 FR2324181 A1 FR 2324181A1
Authority
FR
France
Prior art keywords
switchboard
detector
amplifier
operating state
resistor bridge
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
FR7528088A
Other languages
French (fr)
Other versions
FR2324181B1 (en
Inventor
Gerard Bars
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.)
LANNIONNAIS ELECTRONIQUE
Original Assignee
LANNIONNAIS ELECTRONIQUE
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 LANNIONNAIS ELECTRONIQUE filed Critical LANNIONNAIS ELECTRONIQUE
Priority to FR7528088A priority Critical patent/FR2324181A1/en
Publication of FR2324181A1 publication Critical patent/FR2324181A1/en
Application granted granted Critical
Publication of FR2324181B1 publication Critical patent/FR2324181B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current
    • 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)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

A telephone line loop detector is used to determine the status of a user line connected to an exchange or switchboard. A detector has a transformer (3) connected to the lines (A, B) and the telephone network. The detector also has a resistor bridge circuit (15-20) also connected to the transformer (3), a comparator (C) comprising a differential amplifier, a capacitor (C2) and a meter (30) connected by an optical device (PC). The bridge circuit (15-20) is connected either to a battery (+0, -Vo) or to a call circuit (8) by means of contacts (S1, S2) of a relay (14). The detector can detect use or non-use of a user line and numbering pulses from the user dial.
FR7528088A 1975-09-12 1975-09-12 Telephone line loop detector - has resistor bridge and amplifier to/ operating state of line connected to determine exchange or switchboard Granted FR2324181A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7528088A FR2324181A1 (en) 1975-09-12 1975-09-12 Telephone line loop detector - has resistor bridge and amplifier to/ operating state of line connected to determine exchange or switchboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7528088A FR2324181A1 (en) 1975-09-12 1975-09-12 Telephone line loop detector - has resistor bridge and amplifier to/ operating state of line connected to determine exchange or switchboard

Publications (2)

Publication Number Publication Date
FR2324181A1 true FR2324181A1 (en) 1977-04-08
FR2324181B1 FR2324181B1 (en) 1979-03-23

Family

ID=9159942

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7528088A Granted FR2324181A1 (en) 1975-09-12 1975-09-12 Telephone line loop detector - has resistor bridge and amplifier to/ operating state of line connected to determine exchange or switchboard

Country Status (1)

Country Link
FR (1) FR2324181A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2379206A1 (en) * 1977-01-28 1978-08-25 Western Electric Co LOOP CURRENT DETECTOR FOR TELEPHONE INSTALLATION
EP0060006A1 (en) * 1981-03-11 1982-09-15 Telecommunications Radioelectriques Et Telephoniques T.R.T. Loop detector with small sensibility for longitudinal voltages
EP0199865A1 (en) * 1983-08-18 1986-11-05 Northern Telecom Limited Active impedance transformer-assisted line feed circuit with filtering function of supervision signals
EP0201635A1 (en) * 1985-05-17 1986-11-20 BELL TELEPHONE MANUFACTURING COMPANY Naamloze Vennootschap Telecommunication line circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2138548A1 (en) * 1971-05-19 1973-01-05 Ibm France
US3821486A (en) * 1973-06-22 1974-06-28 Bell Telephone Labor Inc Bridge type supervisory detector with reduced breakdown voltage requirements

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2138548A1 (en) * 1971-05-19 1973-01-05 Ibm France
US3821486A (en) * 1973-06-22 1974-06-28 Bell Telephone Labor Inc Bridge type supervisory detector with reduced breakdown voltage requirements

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
A 347. ARTICLE: "BALANCED ELECTRONIC RECEIVER FOR LOOP SIGNALLING". AUTEUR: FISCHBUCH ET AL.) *
PUBLICATION GB:ELECTRICAL COMMUNICATION, VOL. 44 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2379206A1 (en) * 1977-01-28 1978-08-25 Western Electric Co LOOP CURRENT DETECTOR FOR TELEPHONE INSTALLATION
EP0060006A1 (en) * 1981-03-11 1982-09-15 Telecommunications Radioelectriques Et Telephoniques T.R.T. Loop detector with small sensibility for longitudinal voltages
FR2501940A1 (en) * 1981-03-11 1982-09-17 Trt Telecom Radio Electr LONGITUDINAL TENSION LOOP DETECTOR
EP0199865A1 (en) * 1983-08-18 1986-11-05 Northern Telecom Limited Active impedance transformer-assisted line feed circuit with filtering function of supervision signals
EP0201635A1 (en) * 1985-05-17 1986-11-20 BELL TELEPHONE MANUFACTURING COMPANY Naamloze Vennootschap Telecommunication line circuit
US4837818A (en) * 1985-05-17 1989-06-06 Alcatel N.V. Telecommunication line circuit

Also Published As

Publication number Publication date
FR2324181B1 (en) 1979-03-23

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse