JPS574623A - Fault monitoring system for cable relaying communication system - Google Patents

Fault monitoring system for cable relaying communication system

Info

Publication number
JPS574623A
JPS574623A JP7803380A JP7803380A JPS574623A JP S574623 A JPS574623 A JP S574623A JP 7803380 A JP7803380 A JP 7803380A JP 7803380 A JP7803380 A JP 7803380A JP S574623 A JPS574623 A JP S574623A
Authority
JP
Japan
Prior art keywords
relay
circuit
faulty
detection signal
output
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
JP7803380A
Other languages
Japanese (ja)
Other versions
JPS6014546B2 (en
Inventor
Yoshiro Hakamata
Seiji Nakagawa
Masami Kato
Kenji Tokutome
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP55078033A priority Critical patent/JPS6014546B2/en
Publication of JPS574623A publication Critical patent/JPS574623A/en
Publication of JPS6014546B2 publication Critical patent/JPS6014546B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To perform a real-time monitor for a faulty relay, by varying the level of the faulty relay detection signal by a switch circuit provided at the position of a relay and according to the presence or absence of a fault of the relay. CONSTITUTION:The faulty relay detection signal is transmitted to a monitor signal line 9 from an end office device to reach a manhole 7. The control output of a control circuit 6 of each relay 2 is connected to a switch circuit 8 after obtaining an OR of the output of each relay. When a fault occurs to the working condition of the relay 2, the output of the circuit 6 varies to give a chang to the circuit 8 of the manhole 7. Accordingly, the circuit 8 that had a change can be known by detecting the state under which the faulty relay detection signal is sent to the line 9 and then returned to a monitor signal line 10.
JP55078033A 1980-06-10 1980-06-10 Fault monitoring method for cable relay communication system Expired JPS6014546B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55078033A JPS6014546B2 (en) 1980-06-10 1980-06-10 Fault monitoring method for cable relay communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55078033A JPS6014546B2 (en) 1980-06-10 1980-06-10 Fault monitoring method for cable relay communication system

Publications (2)

Publication Number Publication Date
JPS574623A true JPS574623A (en) 1982-01-11
JPS6014546B2 JPS6014546B2 (en) 1985-04-13

Family

ID=13650492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55078033A Expired JPS6014546B2 (en) 1980-06-10 1980-06-10 Fault monitoring method for cable relay communication system

Country Status (1)

Country Link
JP (1) JPS6014546B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382690A (en) * 1992-08-11 1995-01-17 Mitsui Toatsu Chemicals, Incorporated Method for preparing aromatic secondary amino compound
US5618980A (en) * 1992-08-11 1997-04-08 Mitsui Toatsu Chemicals, Inc. Method for preparing aromatic secondary amino compound

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382690A (en) * 1992-08-11 1995-01-17 Mitsui Toatsu Chemicals, Incorporated Method for preparing aromatic secondary amino compound
US5618980A (en) * 1992-08-11 1997-04-08 Mitsui Toatsu Chemicals, Inc. Method for preparing aromatic secondary amino compound

Also Published As

Publication number Publication date
JPS6014546B2 (en) 1985-04-13

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