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 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)
  • 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)
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 (en) 1978-10-25 1978-10-25 DEVICE FOR MONITORING THE LINE CURRENT IN A TELEPHONE LINE.

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 (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
EP0819328A1 (en) * 1995-04-07 1998-01-21 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
DE2942440A1 (en) 1980-05-08
FR2439998A1 (en) 1980-05-23
GB2035753A (en) 1980-06-18
CH635216A5 (en) 1983-03-15
SE7908436L (en) 1980-04-26
DE2942440C2 (en) 1988-01-21
FR2439998B1 (en) 1983-04-15

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Legal Events

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