JPS5491112A - External abnormal voltage detection system - Google Patents

External abnormal voltage detection system

Info

Publication number
JPS5491112A
JPS5491112A JP15874977A JP15874977A JPS5491112A JP S5491112 A JPS5491112 A JP S5491112A JP 15874977 A JP15874977 A JP 15874977A JP 15874977 A JP15874977 A JP 15874977A JP S5491112 A JPS5491112 A JP S5491112A
Authority
JP
Japan
Prior art keywords
line
abnormal voltage
relay
subscriber
originating register
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
JP15874977A
Other languages
Japanese (ja)
Other versions
JPS588788B2 (en
Inventor
Yoshiaki Matsuura
Hidemi Harada
Moriyoshi Ishida
Shinichi Ito
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15874977A priority Critical patent/JPS588788B2/en
Publication of JPS5491112A publication Critical patent/JPS5491112A/en
Publication of JPS588788B2 publication Critical patent/JPS588788B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To make it possible to disconnect a subscriber's line from an originating register and protect the originating register by providing a circuit, which detects the external continuous abnormal voltage, in the originating register trunk which performs calling detection in an electronic exchange. CONSTITUTION:When external abnormal voltage 10 is applied to a subscriber's line, line relay 2 is operated, and abnormal voltage 10 which passed through contact s operates check relay 11 through diode 13 and resistance 12. As a result, contact Ch of circuit 14 is turned on to communicate the abnormal voltage occurrence to a controller, and the controller issues alarm to disconnect the subscriber's line from an originating register. When check relay 11 is not operated, S relay 15 is operated at a fixed time delay after the operation of line relay 2, and contact s is switched to connect the subscriber's line to the originating register.
JP15874977A 1977-12-28 1977-12-28 External abnormal voltage detection method Expired JPS588788B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15874977A JPS588788B2 (en) 1977-12-28 1977-12-28 External abnormal voltage detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15874977A JPS588788B2 (en) 1977-12-28 1977-12-28 External abnormal voltage detection method

Publications (2)

Publication Number Publication Date
JPS5491112A true JPS5491112A (en) 1979-07-19
JPS588788B2 JPS588788B2 (en) 1983-02-17

Family

ID=15678484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15874977A Expired JPS588788B2 (en) 1977-12-28 1977-12-28 External abnormal voltage detection method

Country Status (1)

Country Link
JP (1) JPS588788B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54116109A (en) * 1978-01-31 1979-09-10 Nec Corp Processing system for ac induction failure
JPS56107172A (en) * 1980-01-31 1981-08-25 Fujitsu Ltd Terrestrial magnetic disturbance detection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62146467U (en) * 1986-03-10 1987-09-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54116109A (en) * 1978-01-31 1979-09-10 Nec Corp Processing system for ac induction failure
JPS56107172A (en) * 1980-01-31 1981-08-25 Fujitsu Ltd Terrestrial magnetic disturbance detection

Also Published As

Publication number Publication date
JPS588788B2 (en) 1983-02-17

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