SE7908436L - DEVICE FOR MONITORING OF LINE LINE IN A TELEPHONE LINE - Google Patents

DEVICE FOR MONITORING OF LINE LINE IN A TELEPHONE LINE

Info

Publication number
SE7908436L
SE7908436L SE7908436A SE7908436A SE7908436L SE 7908436 L SE7908436 L SE 7908436L SE 7908436 A SE7908436 A SE 7908436A SE 7908436 A SE7908436 A SE 7908436A SE 7908436 L SE7908436 L SE 7908436L
Authority
SE
Sweden
Prior art keywords
line
comparators
monitoring
telephone line
measuring
Prior art date
Application number
SE7908436A
Other languages
Unknown language ( )
Swedish (sv)
Original Assignee
Erne Hansjoerg
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 Erne Hansjoerg filed Critical Erne Hansjoerg
Publication of SE7908436L publication Critical patent/SE7908436L/en

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

Abstract

A device for monitoring the line current in a telephone line has a series measuring resistance (3) connected into a wire (4) of a telephone line, and connected to the measuring inputs of two comparators (7, 8). The reference potentials of the comparators (7, 8) are tapped off a voltage divider (12) in such a manner that one comparator (7) responds to positive and the other one (8) symmetrically to negative line currents. The outputs of both comparators (7, 8) are together connected to an optical coupler (24) in order to deliver a measuring signal decoupled, with respect to direct current, to a processing device. For supplying the comparators (7, 8), the voltage divider (12) and the light-emitting diode (23) of the optical coupler (24) with an AC-decoupled direct voltage, a mini-transformer (33) with separate primary and secondary windings (34, 35) is supplied with a high-frequency signal which is rectified by means of a rectifier arrangement (40, 41) connected to the secondary winding (35). <IMAGE>
SE7908436A 1978-10-25 1979-10-11 DEVICE FOR MONITORING OF LINE LINE IN A TELEPHONE LINE SE7908436L (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 (1)

Publication Number Publication Date
SE7908436L true SE7908436L (en) 1980-04-26

Family

ID=4369220

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7908436A SE7908436L (en) 1978-10-25 1979-10-11 DEVICE FOR MONITORING OF LINE LINE 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)

Families Citing this family (7)

* 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
DE3400304A1 (en) * 1982-11-05 1985-07-11 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Circuit for identifying a loop condition
DE3245839A1 (en) * 1982-11-05 1984-05-10 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Circuit arrangement for identifying a loop state
DE3332893C2 (en) * 1983-09-13 1985-08-22 Telecommunication Vertriebsgesellschaft mbH, 6000 Frankfurt Device for loop current detection in telecommunications networks
DE3473803D1 (en) * 1984-06-20 1988-10-06 Ibm Detection circuit for current varations
DE3741072A1 (en) * 1987-12-04 1989-06-15 Standard Elektrik Lorenz Ag Circuit arrangement for detecting an incoming call in a telephone set
WO1996031931A1 (en) * 1995-04-07 1996-10-10 Norcel Limited A.c. power cut-off device

Family Cites Families (6)

* 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
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
FR2251975B1 (en) * 1973-11-16 1979-08-03 Labo Cent Telecommunicat
US4054941A (en) * 1976-12-22 1977-10-18 Bell Telephone Laboratories, Incorporated Range extender with gain

Also Published As

Publication number Publication date
FR2439998B1 (en) 1983-04-15
GB2035753A (en) 1980-06-18
GB2035753B (en) 1982-11-10
DE2942440A1 (en) 1980-05-08
DE2942440C2 (en) 1988-01-21
FR2439998A1 (en) 1980-05-23
CH635216A5 (en) 1983-03-15

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