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JPS52119106A - Supervisory circuit for line signal - Google Patents

Supervisory circuit for line signal

Info

Publication number
JPS52119106A
JPS52119106A JP3582176A JP3582176A JPS52119106A JP S52119106 A JPS52119106 A JP S52119106A JP 3582176 A JP3582176 A JP 3582176A JP 3582176 A JP3582176 A JP 3582176A JP S52119106 A JPS52119106 A JP S52119106A
Authority
JP
Japan
Prior art keywords
line signal
supervisory circuit
channel
circuit
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.)
Granted
Application number
JP3582176A
Other languages
Japanese (ja)
Other versions
JPS5927147B2 (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 JP3582176A priority Critical patent/JPS5927147B2/en
Publication of JPS52119106A publication Critical patent/JPS52119106A/en
Publication of JPS5927147B2 publication Critical patent/JPS5927147B2/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)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To prevent the malfunction from occurring caused by the in-phase longitudinal voltage induced in the channel and to protect the current detection element by constituting the AND circuit with the two transistors operated with the channel current.
JP3582176A 1976-03-31 1976-03-31 Line signal monitoring circuit Expired JPS5927147B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3582176A JPS5927147B2 (en) 1976-03-31 1976-03-31 Line signal monitoring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3582176A JPS5927147B2 (en) 1976-03-31 1976-03-31 Line signal monitoring circuit

Publications (2)

Publication Number Publication Date
JPS52119106A true JPS52119106A (en) 1977-10-06
JPS5927147B2 JPS5927147B2 (en) 1984-07-03

Family

ID=12452603

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3582176A Expired JPS5927147B2 (en) 1976-03-31 1976-03-31 Line signal monitoring circuit

Country Status (1)

Country Link
JP (1) JPS5927147B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6025291U (en) * 1983-07-28 1985-02-20 日本電気ホームエレクトロニクス株式会社 Loop closure detection circuit
JP2007255337A (en) * 2006-03-24 2007-10-04 Mitsubishi Electric Corp Resin impeller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6025291U (en) * 1983-07-28 1985-02-20 日本電気ホームエレクトロニクス株式会社 Loop closure detection circuit
JP2007255337A (en) * 2006-03-24 2007-10-04 Mitsubishi Electric Corp Resin impeller

Also Published As

Publication number Publication date
JPS5927147B2 (en) 1984-07-03

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