JPS547215A - Protecting system for trunk circuit - Google Patents

Protecting system for trunk circuit

Info

Publication number
JPS547215A
JPS547215A JP7206577A JP7206577A JPS547215A JP S547215 A JPS547215 A JP S547215A JP 7206577 A JP7206577 A JP 7206577A JP 7206577 A JP7206577 A JP 7206577A JP S547215 A JPS547215 A JP S547215A
Authority
JP
Japan
Prior art keywords
trunk circuit
protecting system
semiconductor
call line
circuit
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.)
Pending
Application number
JP7206577A
Other languages
Japanese (ja)
Inventor
Shige Miyoshi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7206577A priority Critical patent/JPS547215A/en
Publication of JPS547215A publication Critical patent/JPS547215A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/18—Automatic or semi-automatic exchanges with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To secure protection for the semiconductor when the call line has some fault by discontinuing the current supply to the call line through installation of the abnormal temperature detecting bimetal of the semiconductor, and at the same time to realize a small size and the economical improvement of the circuit.
JP7206577A 1977-06-20 1977-06-20 Protecting system for trunk circuit Pending JPS547215A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7206577A JPS547215A (en) 1977-06-20 1977-06-20 Protecting system for trunk circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7206577A JPS547215A (en) 1977-06-20 1977-06-20 Protecting system for trunk circuit

Publications (1)

Publication Number Publication Date
JPS547215A true JPS547215A (en) 1979-01-19

Family

ID=13478611

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7206577A Pending JPS547215A (en) 1977-06-20 1977-06-20 Protecting system for trunk circuit

Country Status (1)

Country Link
JP (1) JPS547215A (en)

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