JPS56158555A - Failure retrieval system - Google Patents

Failure retrieval system

Info

Publication number
JPS56158555A
JPS56158555A JP6242880A JP6242880A JPS56158555A JP S56158555 A JPS56158555 A JP S56158555A JP 6242880 A JP6242880 A JP 6242880A JP 6242880 A JP6242880 A JP 6242880A JP S56158555 A JPS56158555 A JP S56158555A
Authority
JP
Japan
Prior art keywords
signal
retrieval
transferred
failure
allocated frequency
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
JP6242880A
Other languages
Japanese (ja)
Inventor
Kazuo Yamaguchi
Nobuhide Yamaguchi
Motohide Takahashi
Akira Hakuta
Hiroo Kitasagami
Takashi Hoshino
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
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP6242880A priority Critical patent/JPS56158555A/en
Publication of JPS56158555A publication Critical patent/JPS56158555A/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
    • H04B17/401—Monitoring; Testing of relay systems with selective localization
    • H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
    • H04B17/404—Monitoring; Testing of relay systems with selective localization using different frequencies selected by local filters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To increase the accuracy of retrieval, by comparing the phase between a signal transferred to an office and a signal in the original allocated frequency, in a failure retrieval system in which specific code trains are transmitted for retrieval. CONSTITUTION:A plurality of binary code trains are in code conversion according to the rule of code conversion to obtain the O level at closed two time slots almost every given bit number, and every 1/2 period of allocated frequency by relay devices 3-1--3, the means producing failure retrieval signal of multivalue code train having O level at one time slot is provided to offices 1-2 in place of two time slots, failure retrieval signals are transmitted to transmission lines 6-1-6-3, 7-1-7-3, the signal of allocated frequency is detected with the relay devices 3-1- 3-3 and it is transferred to the offices 1-2. The offices 1-2 make phase comparison between transferred signals and the signal with the original allocated frequency, and the location of failure can be retrieved by measuring the level variance of the transferred signal.
JP6242880A 1980-05-12 1980-05-12 Failure retrieval system Pending JPS56158555A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6242880A JPS56158555A (en) 1980-05-12 1980-05-12 Failure retrieval system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6242880A JPS56158555A (en) 1980-05-12 1980-05-12 Failure retrieval system

Publications (1)

Publication Number Publication Date
JPS56158555A true JPS56158555A (en) 1981-12-07

Family

ID=13199878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6242880A Pending JPS56158555A (en) 1980-05-12 1980-05-12 Failure retrieval system

Country Status (1)

Country Link
JP (1) JPS56158555A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05240616A (en) * 1992-03-02 1993-09-17 Nippon Tetsudo Kensetsu Kodan Alignment measuring instrument for rail and fitting jig for fixing it to reverence instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05240616A (en) * 1992-03-02 1993-09-17 Nippon Tetsudo Kensetsu Kodan Alignment measuring instrument for rail and fitting jig for fixing it to reverence instrument

Similar Documents

Publication Publication Date Title
DE3788157D1 (en) Transmission system for a digital signal.
DE3854231D1 (en) Bit rate adaptation system for digital transmission systems.
DE3586028D1 (en) DATA TRANSMISSION DEVICE THAT HAS A DATA NETWORK WITH A TREE STRUCTURE.
FI854562A0 (en) FOERFARANDE FOER ATT KONTROLLERA EN PARAMETER SOM BASERAR SIG PAO FILTRERADE DATA.
ES8602328A1 (en) Multiplexer system for automatic meter reading.
ES518577A0 (en) A SOFT MAIN SUSPENSION DEVICE ON A RAILWAY CARRIAGE.
IT8123483A0 (en) EQUIPMENT FOR TRANSMITTING A DIGITAL SIGNAL.
IT8123501A0 (en) DIGITAL SIGNAL TRANSMISSION SYSTEM.
JPS57170652A (en) Transmitting system for burst signal
ZA772397B (en) Supervisory system for a data transmission system
JPS56158555A (en) Failure retrieval system
ES8101827A1 (en) Method and device for transmitting a binary sequence.
DK0568532T3 (en) Method of transmitting digitized, block-coded audio signals using scale factors
EP0196634A3 (en) Network system
JPS5291301A (en) Communication system for travelling object
JPS5666947A (en) Data transmission method
JPS57136845A (en) Coding and transfer system of information data
AU506477B2 (en) Alphabet code converter for digital signal transmission systems
JPS5374308A (en) Transmission signal output level control system
NO812897L (en) REMOVAL DEVICE WITH THE RELEASE OF RECEIVED NOTIFICATIONS AND STATE NOTIFICATIONS DEPENDING ON STATE OPERATING CONDITIONS
GB2000925B (en) Transmission system
SU678691A1 (en) Discrete information transmitting method
JPS5416113A (en) Supervisory system for circuit error
JPS5721168A (en) Video data coding method
JPS53131715A (en) Circuit selection system