GB2035753B - Monitoring telephone line current - Google Patents

Monitoring telephone line current

Info

Publication number
GB2035753B
GB2035753B GB7936847A GB7936847A GB2035753B GB 2035753 B GB2035753 B GB 2035753B GB 7936847 A GB7936847 A GB 7936847A GB 7936847 A GB7936847 A GB 7936847A GB 2035753 B GB2035753 B GB 2035753B
Authority
GB
United Kingdom
Prior art keywords
telephone line
line current
monitoring telephone
monitoring
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
GB7936847A
Other languages
English (en)
Other versions
GB2035753A (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 GB2035753A publication Critical patent/GB2035753A/en
Application granted granted Critical
Publication of GB2035753B publication Critical patent/GB2035753B/en
Expired 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)
  • 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)
GB7936847A 1978-10-25 1979-10-24 Monitoring telephone line current Expired GB2035753B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1102078A CH635216A5 (de) 1978-10-25 1978-10-25 Geraet zur ueberwachung des linienstromes in einer telefonleitung.

Publications (2)

Publication Number Publication Date
GB2035753A GB2035753A (en) 1980-06-18
GB2035753B true GB2035753B (en) 1982-11-10

Family

ID=4369220

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7936847A Expired GB2035753B (en) 1978-10-25 1979-10-24 Monitoring telephone line current

Country Status (5)

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

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3141661A1 (de) * 1981-10-21 1983-05-05 Brown, Boveri & Cie Ag, 6800 Mannheim Einrichtung zur ueberwachung von stromkreisen
DE3245839A1 (de) * 1982-11-05 1984-05-10 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Schaltungsanordnung zum erkennen eines schleifenzustands
DE3400304A1 (de) * 1982-11-05 1985-07-11 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Schaltung zum erkennen eines schleifenzustands
DE3332893C2 (de) * 1983-09-13 1985-08-22 Telecommunication Vertriebsgesellschaft mbH, 6000 Frankfurt Einrichtung zur Schleifenstromerkennung in Fernmeldenetzen
EP0165363B1 (fr) * 1984-06-20 1988-08-31 International Business Machines Corporation Circuit detecteur de variations de courant
DE3741072A1 (de) * 1987-12-04 1989-06-15 Standard Elektrik Lorenz Ag Schaltungsanordnung zur erkennung eines ankommenden gespraeches in einem fernsprechapparat
AU5645996A (en) * 1995-04-07 1996-10-23 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 (de) * 1965-02-15 1968-02-08 Telefonbau Relaislose Teilnehmeranschlussschaltung fuer Fernsprechanlagen
BE754235A (fr) * 1969-08-05 1970-12-31 Western Electric Co Circuit de supervision pour lignes telephoniques
DE1950672C3 (de) * 1969-10-08 1975-05-15 Friedrich Merk Telefonbau Gmbh, 8000 Muenchen Schaltungsanordnung zur Rufstromanschaltung und Ausgängeüberwachung in Verbindungssätzen von Fernsprechanlagen
AT315248B (de) * 1971-09-20 1974-05-10 Kapsch Telephon Telegraph Schaltungsanordnung zur amts- oder teilnehmerseitigen Überwachung des Schleifenzustandes in Fernsprechanlagen
FR2251975B1 (enrdf_load_stackoverflow) * 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
FR2439998A1 (fr) 1980-05-23
FR2439998B1 (enrdf_load_stackoverflow) 1983-04-15
SE7908436L (sv) 1980-04-26
GB2035753A (en) 1980-06-18
DE2942440A1 (de) 1980-05-08
DE2942440C2 (enrdf_load_stackoverflow) 1988-01-21
CH635216A5 (de) 1983-03-15

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee