JPS55156454A - Fault search system of digital transmission system - Google Patents

Fault search system of digital transmission system

Info

Publication number
JPS55156454A
JPS55156454A JP6380779A JP6380779A JPS55156454A JP S55156454 A JPS55156454 A JP S55156454A JP 6380779 A JP6380779 A JP 6380779A JP 6380779 A JP6380779 A JP 6380779A JP S55156454 A JPS55156454 A JP S55156454A
Authority
JP
Japan
Prior art keywords
repeater
stage
prior
sequence
cycles
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
JP6380779A
Other languages
Japanese (ja)
Inventor
Norio Seki
Yotaro Hachitsuka
Haruo Sakaguchi
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP6380779A priority Critical patent/JPS55156454A/en
Publication of JPS55156454A publication Critical patent/JPS55156454A/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)

Abstract

PURPOSE:To make a seach for a fault by providing a repeater with the function of starting a PN(artificial random signal) sequence generating circuit when a signal from a prior-stage repeater is interrupted and the function of stopping a specific repeater from relay operating on detecting a control signal of specific repetitive cycles from a supervisory station. CONSTITUTION:When signals can not be sent out due to a fault of repeater R1k at the prior stage of repeater R1k+1 and optical fiber l between repeater R1k+1 and prior-stage repeater R1k is cut off, each repeater detects no received signal arriving to actuate PN sequence generating circuit 1 which generates a PN sequence of cycles characteristic to each trunk line. Then, PN sequence P is sent to the post-stage supervisory station M, which detects cycles of this PN sequence to judge repeater R1k+1 corresponding to the cycles, thereby identifying as a fault position an optical fiber extending to prior-stage repeater R1k or prior-stage repeater R1k.
JP6380779A 1979-05-25 1979-05-25 Fault search system of digital transmission system Pending JPS55156454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6380779A JPS55156454A (en) 1979-05-25 1979-05-25 Fault search system of digital transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6380779A JPS55156454A (en) 1979-05-25 1979-05-25 Fault search system of digital transmission system

Publications (1)

Publication Number Publication Date
JPS55156454A true JPS55156454A (en) 1980-12-05

Family

ID=13240006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6380779A Pending JPS55156454A (en) 1979-05-25 1979-05-25 Fault search system of digital transmission system

Country Status (1)

Country Link
JP (1) JPS55156454A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58182351A (en) * 1982-03-31 1983-10-25 ジ−メンス・アクチエンゲゼルシヤフト Method and device for monitoring operation of transmission zone to digital signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58182351A (en) * 1982-03-31 1983-10-25 ジ−メンス・アクチエンゲゼルシヤフト Method and device for monitoring operation of transmission zone to digital signal

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