JPS5787648A - Data transmission controller - Google Patents

Data transmission controller

Info

Publication number
JPS5787648A
JPS5787648A JP55164349A JP16434980A JPS5787648A JP S5787648 A JPS5787648 A JP S5787648A JP 55164349 A JP55164349 A JP 55164349A JP 16434980 A JP16434980 A JP 16434980A JP S5787648 A JPS5787648 A JP S5787648A
Authority
JP
Japan
Prior art keywords
transmission line
signal
line
transmission
timer
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
JP55164349A
Other languages
Japanese (ja)
Other versions
JPS647710B2 (en
Inventor
Masahiro Tada
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP55164349A priority Critical patent/JPS5787648A/en
Publication of JPS5787648A publication Critical patent/JPS5787648A/en
Publication of JPS647710B2 publication Critical patent/JPS647710B2/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)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To eliminate the need for a special controller as usual and to obtain the transmission system with high reliability, by giving a present/spare switching function to a plurality of data transmitters connected to a loop transmission line discretely. CONSTITUTION:If a signal from a now-in-use transmission line 2A-IN is interrupted, a signal line 103A changes from logic ''1'' to ''0'', the count of a timer is started and a signal line 112 changes from logic ''0'' to ''1'', and a selector circuit 21 transmits a pattern signal from a specific pattern generating circuit 24 to a signal line 124. As a result, a specific pattern is outputted to a transmission line 2A-OUT. If no input signal reaches the transmission line 2A-IN even after counting by the timer for a prescribed time, it is judged that a fixed failure takes place on the now-in-use transmission line 2A, and the spare transmission line is used for data transmission by the operation of a control circuit 11.
JP55164349A 1980-11-21 1980-11-21 Data transmission controller Granted JPS5787648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55164349A JPS5787648A (en) 1980-11-21 1980-11-21 Data transmission controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55164349A JPS5787648A (en) 1980-11-21 1980-11-21 Data transmission controller

Publications (2)

Publication Number Publication Date
JPS5787648A true JPS5787648A (en) 1982-06-01
JPS647710B2 JPS647710B2 (en) 1989-02-09

Family

ID=15791470

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55164349A Granted JPS5787648A (en) 1980-11-21 1980-11-21 Data transmission controller

Country Status (1)

Country Link
JP (1) JPS5787648A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102059A2 (en) * 1982-08-25 1984-03-07 Nec Corporation Data transmission device for loop transmission system
JPS59224937A (en) * 1983-06-03 1984-12-17 Nec Corp Loop data transmitter
JPS61148940A (en) * 1984-12-24 1986-07-07 Hitachi Ltd Test method of data transmission network for train control
JPS63238734A (en) * 1987-03-26 1988-10-04 Nec Corp Loop integrating system at time of rise of data transmitting equipment
JPH07212386A (en) * 1994-01-10 1995-08-11 Fujitsu Ltd Changing-over circuit for signal line

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102059A2 (en) * 1982-08-25 1984-03-07 Nec Corporation Data transmission device for loop transmission system
JPS59224937A (en) * 1983-06-03 1984-12-17 Nec Corp Loop data transmitter
JPS61148940A (en) * 1984-12-24 1986-07-07 Hitachi Ltd Test method of data transmission network for train control
JPH0376618B2 (en) * 1984-12-24 1991-12-06 Hitachi Ltd
JPS63238734A (en) * 1987-03-26 1988-10-04 Nec Corp Loop integrating system at time of rise of data transmitting equipment
JPH07212386A (en) * 1994-01-10 1995-08-11 Fujitsu Ltd Changing-over circuit for signal line

Also Published As

Publication number Publication date
JPS647710B2 (en) 1989-02-09

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