JPS57212848A - Loop back control system - Google Patents

Loop back control system

Info

Publication number
JPS57212848A
JPS57212848A JP9758581A JP9758581A JPS57212848A JP S57212848 A JPS57212848 A JP S57212848A JP 9758581 A JP9758581 A JP 9758581A JP 9758581 A JP9758581 A JP 9758581A JP S57212848 A JPS57212848 A JP S57212848A
Authority
JP
Japan
Prior art keywords
loop
line
loop back
catching
remote terminal
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
JP9758581A
Other languages
Japanese (ja)
Inventor
Koji Iijima
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 JP9758581A priority Critical patent/JPS57212848A/en
Publication of JPS57212848A publication Critical patent/JPS57212848A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To simplify the processing to be remedied only with one sort of loop back command, by performing loop back to other loop lines after the catching of the other loop lines is detected owing to out of synchronism derived from a line failure. CONSTITUTION:If two lines have a failure at a point X, out of synchronism is caused at remote terminal devices 4 and 5 catching a loop line 6 of the #0 system, and resulting into a catching of a loop line 7 of the #1 system. In this state, remote terminal devices 3 and 4 are prepared to receive a loop back command. Thus, in the remote terminal device 3, the catching of the loop line 6 of the #0 system and the instruction of the loop back are informed to a line control section. Then, the line control section performs loop back from the loop line 6 of the #0 system to the loop line 7 of the #1 system. Similarly, in the remote terminal device 4, the loop back from the loop line 7 of the #1 system to the loop line 6 of the #0 system is performed.
JP9758581A 1981-06-25 1981-06-25 Loop back control system Pending JPS57212848A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9758581A JPS57212848A (en) 1981-06-25 1981-06-25 Loop back control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9758581A JPS57212848A (en) 1981-06-25 1981-06-25 Loop back control system

Publications (1)

Publication Number Publication Date
JPS57212848A true JPS57212848A (en) 1982-12-27

Family

ID=14196308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9758581A Pending JPS57212848A (en) 1981-06-25 1981-06-25 Loop back control system

Country Status (1)

Country Link
JP (1) JPS57212848A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59158154A (en) * 1983-02-28 1984-09-07 Nec Corp Loop-back system
JPS60187160A (en) * 1984-03-07 1985-09-24 Fujitsu Ltd Information system for trouble of loop transmission line
US6622258B1 (en) * 2000-04-10 2003-09-16 Appian Communications, Inc. Data protection in a ring network

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5475203A (en) * 1977-11-29 1979-06-15 Toshiba Corp Circulating type information transmission system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5475203A (en) * 1977-11-29 1979-06-15 Toshiba Corp Circulating type information transmission system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59158154A (en) * 1983-02-28 1984-09-07 Nec Corp Loop-back system
JPH0157860B2 (en) * 1983-02-28 1989-12-07 Nippon Denki Kk
JPS60187160A (en) * 1984-03-07 1985-09-24 Fujitsu Ltd Information system for trouble of loop transmission line
JPH0376616B2 (en) * 1984-03-07 1991-12-06 Fujitsu Ltd
US6622258B1 (en) * 2000-04-10 2003-09-16 Appian Communications, Inc. Data protection in a ring network

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