JPS57173246A - Data transmission system - Google Patents

Data transmission system

Info

Publication number
JPS57173246A
JPS57173246A JP56058144A JP5814481A JPS57173246A JP S57173246 A JPS57173246 A JP S57173246A JP 56058144 A JP56058144 A JP 56058144A JP 5814481 A JP5814481 A JP 5814481A JP S57173246 A JPS57173246 A JP S57173246A
Authority
JP
Japan
Prior art keywords
circuit
loop
output
transmission line
synchronizing signal
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
JP56058144A
Other languages
Japanese (ja)
Inventor
Shogo Nasu
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56058144A priority Critical patent/JPS57173246A/en
Publication of JPS57173246A publication Critical patent/JPS57173246A/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 facilitate looping-back operation in case of a fault by doubling a transmission line and then monitoring a synchronizing signal. CONSTITUTION:If a loop transmission line 7 is broken, no synchronizing signal is outputted from a receiving circuit 311 after the breaking of the line, so a monitoring circuit 313 outputs a fault signal a prescribed time later to cut off an AND gate 325, thereby selecting the output of a receiving circuit 321 as the output of a switching circuit 312 by a control circuit 314. When a transmitter 3 enters into a passive loop-back mode, no synchronizing signal is transmitted to a transmission line 8 and a monitoring circuit 223 sends out a fault signal a prescribed time later, so that a transmitter 2 enters into an active loop-back mode. In this mode, a control circuit 224 leads the output of a data processing circuit 217 to an AND gate 225 through a switching circuit 222. Thus, when the transmitters 2 and 3 enter into the active and passive loop-back modes, respectively, a loop-back connection state is set as shown by dotted lines in the figure and data transmission is carried out between optional transmitters.
JP56058144A 1981-04-17 1981-04-17 Data transmission system Pending JPS57173246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56058144A JPS57173246A (en) 1981-04-17 1981-04-17 Data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56058144A JPS57173246A (en) 1981-04-17 1981-04-17 Data transmission system

Publications (1)

Publication Number Publication Date
JPS57173246A true JPS57173246A (en) 1982-10-25

Family

ID=13075791

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56058144A Pending JPS57173246A (en) 1981-04-17 1981-04-17 Data transmission system

Country Status (1)

Country Link
JP (1) JPS57173246A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819057A (en) * 1981-07-27 1983-02-03 Hitachi Ltd Constitution controller for loop data transmission system
JPS59151552A (en) * 1983-02-17 1984-08-30 Matsushita Electric Ind Co Ltd Loop communication system
JPS59158146A (en) * 1983-02-28 1984-09-07 Nec Corp Data highway device
JPS6041837A (en) * 1983-08-17 1985-03-05 Fujitsu Ltd Loopback releasing system
JPS6110344A (en) * 1984-06-26 1986-01-17 Seiichi Miyazaki Loopback control system in data transmission
JPH02121547A (en) * 1988-10-31 1990-05-09 Toshiba Corp Local area network
USRE37401E1 (en) 1990-05-09 2001-10-02 Fujitsu Limited Fault recovery system of a ring network

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819057A (en) * 1981-07-27 1983-02-03 Hitachi Ltd Constitution controller for loop data transmission system
JPS59151552A (en) * 1983-02-17 1984-08-30 Matsushita Electric Ind Co Ltd Loop communication system
JPS59158146A (en) * 1983-02-28 1984-09-07 Nec Corp Data highway device
JPS6041837A (en) * 1983-08-17 1985-03-05 Fujitsu Ltd Loopback releasing system
JPS6110344A (en) * 1984-06-26 1986-01-17 Seiichi Miyazaki Loopback control system in data transmission
JPH0370947B2 (en) * 1984-06-26 1991-11-11 Seiichi Myazaki
JPH02121547A (en) * 1988-10-31 1990-05-09 Toshiba Corp Local area network
USRE37401E1 (en) 1990-05-09 2001-10-02 Fujitsu Limited Fault recovery system of a ring network

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