JPS5679549A - Loop type data highway system - Google Patents

Loop type data highway system

Info

Publication number
JPS5679549A
JPS5679549A JP15567479A JP15567479A JPS5679549A JP S5679549 A JPS5679549 A JP S5679549A JP 15567479 A JP15567479 A JP 15567479A JP 15567479 A JP15567479 A JP 15567479A JP S5679549 A JPS5679549 A JP S5679549A
Authority
JP
Japan
Prior art keywords
line
output
station
demodulator
flop
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
JP15567479A
Other languages
Japanese (ja)
Inventor
Masakazu Okada
Toshiyuki Ide
Hitoshi Fushimi
Seiichi Yasumoto
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15567479A priority Critical patent/JPS5679549A/en
Publication of JPS5679549A publication Critical patent/JPS5679549A/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)

Abstract

PURPOSE:To give the centralized monitor function for the entire system and to increase the maintenanceability, by reducing the failure detection and switching time and enabling to keep the data transmission without detaching the station from the loop even if failures such as open line are produced at a plurality of parts of one line, in a loop. CONSTITUTION:Normally, a line switching filp-flop 51 is set to A side, and the output of a receiver 201 at the side A is given to a demodulator 21 with gates 521- 523. If a failure is produced on the line A, the output of a line monitor circuit 501 is fallen, and if the line B is normal, the flip-flop 51 is clear with the gate 524 and it is set to the side B, and the output of the receiver 202 at side B is given to the demodulator 21. Taking the line monitor time at the station at lowermost stream nearest the CST (central station) as minimum and taking greater sequentially, two stations are avoided for failure detection at the same time.
JP15567479A 1979-12-03 1979-12-03 Loop type data highway system Pending JPS5679549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15567479A JPS5679549A (en) 1979-12-03 1979-12-03 Loop type data highway system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15567479A JPS5679549A (en) 1979-12-03 1979-12-03 Loop type data highway system

Publications (1)

Publication Number Publication Date
JPS5679549A true JPS5679549A (en) 1981-06-30

Family

ID=15611092

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15567479A Pending JPS5679549A (en) 1979-12-03 1979-12-03 Loop type data highway system

Country Status (1)

Country Link
JP (1) JPS5679549A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5190245A (en) * 1975-02-05 1976-08-07
JPS5438704A (en) * 1977-09-02 1979-03-23 Toshiba Corp Loop-type data transmission device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5190245A (en) * 1975-02-05 1976-08-07
JPS5438704A (en) * 1977-09-02 1979-03-23 Toshiba Corp Loop-type data transmission device

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