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JPS52126109A - Line signal watch circuit - Google Patents

Line signal watch circuit

Info

Publication number
JPS52126109A
JPS52126109A JP4273176A JP4273176A JPS52126109A JP S52126109 A JPS52126109 A JP S52126109A JP 4273176 A JP4273176 A JP 4273176A JP 4273176 A JP4273176 A JP 4273176A JP S52126109 A JPS52126109 A JP S52126109A
Authority
JP
Japan
Prior art keywords
line signal
watch circuit
signal watch
circuit
installation
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
JP4273176A
Other languages
Japanese (ja)
Other versions
JPS5838036B2 (en
Inventor
Shigeru Kimura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4273176A priority Critical patent/JPS5838036B2/en
Publication of JPS52126109A publication Critical patent/JPS52126109A/en
Publication of JPS5838036B2 publication Critical patent/JPS5838036B2/en
Expired legal-status Critical Current

Links

Classifications

    • 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)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To highly densify the installation of the watch circuit, by using the solid electronic circuit.
JP4273176A 1976-04-15 1976-04-15 Line signal monitoring circuit Expired JPS5838036B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4273176A JPS5838036B2 (en) 1976-04-15 1976-04-15 Line signal monitoring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4273176A JPS5838036B2 (en) 1976-04-15 1976-04-15 Line signal monitoring circuit

Publications (2)

Publication Number Publication Date
JPS52126109A true JPS52126109A (en) 1977-10-22
JPS5838036B2 JPS5838036B2 (en) 1983-08-19

Family

ID=12644182

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4273176A Expired JPS5838036B2 (en) 1976-04-15 1976-04-15 Line signal monitoring circuit

Country Status (1)

Country Link
JP (1) JPS5838036B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5630390A (en) * 1979-08-21 1981-03-26 Nec Corp Subscriber's grounding detecting circuit
JPS56134897A (en) * 1980-03-25 1981-10-21 Nec Corp Detecting and display circuit for channel polarity

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5630390A (en) * 1979-08-21 1981-03-26 Nec Corp Subscriber's grounding detecting circuit
JPS6362953B2 (en) * 1979-08-21 1988-12-05
JPS56134897A (en) * 1980-03-25 1981-10-21 Nec Corp Detecting and display circuit for channel polarity

Also Published As

Publication number Publication date
JPS5838036B2 (en) 1983-08-19

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