JPS57187669A - Detecting method for fault of submarine coaxial cable - Google Patents

Detecting method for fault of submarine coaxial cable

Info

Publication number
JPS57187669A
JPS57187669A JP56072760A JP7276081A JPS57187669A JP S57187669 A JPS57187669 A JP S57187669A JP 56072760 A JP56072760 A JP 56072760A JP 7276081 A JP7276081 A JP 7276081A JP S57187669 A JPS57187669 A JP S57187669A
Authority
JP
Japan
Prior art keywords
fault
pilot
rapidly
coaxial cable
detected
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
JP56072760A
Other languages
Japanese (ja)
Inventor
Tatsuo Matsumoto
Tamio Onuma
Michimasa Ohara
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 JP56072760A priority Critical patent/JPS57187669A/en
Publication of JPS57187669A publication Critical patent/JPS57187669A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

PURPOSE:To detect a fault of a submarine coaxial cable rapidly and surely and thereby break a feeding device without delay, by branching a pilot-signal detection signal rapidly responding to the detection of the fault, so as to detect the fault and cope with the same. CONSTITUTION:A plurality of pilot signals for monitoring transmission characteristics, sent from a terminal station 24' and responding rapidly to the detection of a fault, are branched by a hybrid 26 of a home station 24 and detected by a pilot detecting device 27. Pilot-signal detection signals delivered therefrom are branched respectively by branching terminals 29 and supplied to an AND gate 31. When a submarine coaxial cable 22 is disconnected completely, each pilot signal is not detected and the output of the gate 31 is inverted to a low level. Thus the fault is detected rapidly, a feeding device 30 is deenergized through a driving circuit 32, and thereby a supply of constant current to the relay 21 of the cable 22 is stopped immediately without delay. In this way, the impression of surge current or the like on an apparatus such as a communications apparatus can surely be prevented.
JP56072760A 1981-05-14 1981-05-14 Detecting method for fault of submarine coaxial cable Pending JPS57187669A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56072760A JPS57187669A (en) 1981-05-14 1981-05-14 Detecting method for fault of submarine coaxial cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56072760A JPS57187669A (en) 1981-05-14 1981-05-14 Detecting method for fault of submarine coaxial cable

Publications (1)

Publication Number Publication Date
JPS57187669A true JPS57187669A (en) 1982-11-18

Family

ID=13498633

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56072760A Pending JPS57187669A (en) 1981-05-14 1981-05-14 Detecting method for fault of submarine coaxial cable

Country Status (1)

Country Link
JP (1) JPS57187669A (en)

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