JPS5768956A - Failure retrieval system - Google Patents

Failure retrieval system

Info

Publication number
JPS5768956A
JPS5768956A JP14545480A JP14545480A JPS5768956A JP S5768956 A JPS5768956 A JP S5768956A JP 14545480 A JP14545480 A JP 14545480A JP 14545480 A JP14545480 A JP 14545480A JP S5768956 A JPS5768956 A JP S5768956A
Authority
JP
Japan
Prior art keywords
speed conversion
conversion circuit
station
signal
transmission line
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
JP14545480A
Other languages
Japanese (ja)
Inventor
Hiroo Kitasagami
Kazuo Yamaguchi
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 JP14545480A priority Critical patent/JPS5768956A/en
Publication of JPS5768956A publication Critical patent/JPS5768956A/en
Pending 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)
  • Dc Digital Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To enable failure retrieval in on-line, by alternately outputting coarse and fine pattern signals every half period of station assignment frequency, in a failure retrieval system of transmission line using binary code. CONSTITUTION:Speed conversion is made at a speed conversion circuit VC1 for inputted data, synchronizing bit is inserted and inputted to 3B, 4B conversion circuit BCT, and a dense pattern mode 1 and a coarse pattern mode 2 signals are outputted alternately every half period of signal frequency from a clock source f1 and transmitted to a transmission line L with precoding. In a relay device, the output of a playback device is brached and the signal component assigned to the station itself is picked up by inputting it to TFF and BPF and transferred to a terminal station. At a reception terminal station, decoding is made at a decoder DEC and converted into the signal in original bit number at an inversion circuit RECT, the speed conversion and synchronizing bit rejection are made at the speed conversion circuit VC2 to obtain the original data.
JP14545480A 1980-10-17 1980-10-17 Failure retrieval system Pending JPS5768956A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14545480A JPS5768956A (en) 1980-10-17 1980-10-17 Failure retrieval system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14545480A JPS5768956A (en) 1980-10-17 1980-10-17 Failure retrieval system

Publications (1)

Publication Number Publication Date
JPS5768956A true JPS5768956A (en) 1982-04-27

Family

ID=15385596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14545480A Pending JPS5768956A (en) 1980-10-17 1980-10-17 Failure retrieval system

Country Status (1)

Country Link
JP (1) JPS5768956A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58215829A (en) * 1982-06-09 1983-12-15 Nec Corp Locating system of fault in repeater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58215829A (en) * 1982-06-09 1983-12-15 Nec Corp Locating system of fault in repeater

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