JPS5679548A - Control system of loop type data transmission system - Google Patents

Control system of loop type data transmission system

Info

Publication number
JPS5679548A
JPS5679548A JP15564579A JP15564579A JPS5679548A JP S5679548 A JPS5679548 A JP S5679548A JP 15564579 A JP15564579 A JP 15564579A JP 15564579 A JP15564579 A JP 15564579A JP S5679548 A JPS5679548 A JP S5679548A
Authority
JP
Japan
Prior art keywords
circuit
transmission
fed
reception
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.)
Granted
Application number
JP15564579A
Other languages
Japanese (ja)
Other versions
JPH0124383B2 (en
Inventor
Sadao Mizokawa
Seiichi Yasumoto
Masahiro Takahashi
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 JP15564579A priority Critical patent/JPS5679548A/en
Publication of JPS5679548A publication Critical patent/JPS5679548A/en
Publication of JPH0124383B2 publication Critical patent/JPH0124383B2/ja
Granted 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 enable automatic failure diagnosis of system and to decrease the restoration time at system down , by transmitting failures such as open transmission line and out of synchronism of station with one common transmission bus, in a loop system transmitting system. CONSTITUTION:A signal input to a reception circuit 18 via a transmission line 54 is respectively fed to a timing pickup circuit 19, demodulation circuit 26, and detection circuit 31 monitoring the presence of reception signal. The output of the timing pickup circuit 19 is fed to a PLL20 and fed to a control section 29 as reception clock and reception data. The transmission data from the control section 29 and the clock are fed to a modulation circuit 28 and fed to the next stage station via a transmission circuit 55 at the transmission circuit 30. If the reception signal transmitted from a transmission line 54 is absent, and if out of synchronism is caused, the detection circuits 31 and 27 detect it, logical sum is taken at a gate circuit 32 and the transmission restricting means 60 is operated with the output of the modulation circuit 28.
JP15564579A 1979-12-03 1979-12-03 Control system of loop type data transmission system Granted JPS5679548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15564579A JPS5679548A (en) 1979-12-03 1979-12-03 Control system of loop type data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15564579A JPS5679548A (en) 1979-12-03 1979-12-03 Control system of loop type data transmission system

Publications (2)

Publication Number Publication Date
JPS5679548A true JPS5679548A (en) 1981-06-30
JPH0124383B2 JPH0124383B2 (en) 1989-05-11

Family

ID=15610492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15564579A Granted JPS5679548A (en) 1979-12-03 1979-12-03 Control system of loop type data transmission system

Country Status (1)

Country Link
JP (1) JPS5679548A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295104A (en) * 1976-02-06 1977-08-10 Hitachi Ltd Data transmission device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295104A (en) * 1976-02-06 1977-08-10 Hitachi Ltd Data transmission device

Also Published As

Publication number Publication date
JPH0124383B2 (en) 1989-05-11

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