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JPS57178447A - Loop data transmission system - Google Patents

Loop data transmission system

Info

Publication number
JPS57178447A
JPS57178447A JP56064533A JP6453381A JPS57178447A JP S57178447 A JPS57178447 A JP S57178447A JP 56064533 A JP56064533 A JP 56064533A JP 6453381 A JP6453381 A JP 6453381A JP S57178447 A JPS57178447 A JP S57178447A
Authority
JP
Japan
Prior art keywords
flag
frame
station
terminal
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
JP56064533A
Other languages
Japanese (ja)
Other versions
JPS6352828B2 (en
Inventor
Masahiro Mochizuki
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 JP56064533A priority Critical patent/JPS57178447A/en
Publication of JPS57178447A publication Critical patent/JPS57178447A/en
Publication of JPS6352828B2 publication Critical patent/JPS6352828B2/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 eliminate the need for a storage circuit storing the number of terminal stations, and a control circuit for detecting a by-pass station, by transmitting one frame for minitoring the number of terminal stations and then counting flag bits by a minitor station after the frame has one round of a loop transmission line. CONSTITUTION:When a monitor station 2 is to minitor the number of terminal stations connected to a transmission line, a flag adding circuit sends the flag of, for example, the 3rd frame to the transmission line as a ''1''. A terminal station 3 receives the transmitted signal from the monitor station 2 and since the flag of the received signal in the 3rd frame is the ''1'', the flag adding circuit operates to transmit a transmitted singnal, wherein the flag in the 3rd frame is set to a ''1'', to a next terminal station 4. The terminal station performs similar operation to transmit a transmitted signal wherein the flag in the 3rd frame is set to a ''1''. The monitor station 2 receives a transmitted signal which has taken one round of the loop and counts the number of the ''1''s as received flags, thus confirming the number of terminal stations.
JP56064533A 1981-04-27 1981-04-27 Loop data transmission system Granted JPS57178447A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56064533A JPS57178447A (en) 1981-04-27 1981-04-27 Loop data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56064533A JPS57178447A (en) 1981-04-27 1981-04-27 Loop data transmission system

Publications (2)

Publication Number Publication Date
JPS57178447A true JPS57178447A (en) 1982-11-02
JPS6352828B2 JPS6352828B2 (en) 1988-10-20

Family

ID=13260950

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56064533A Granted JPS57178447A (en) 1981-04-27 1981-04-27 Loop data transmission system

Country Status (1)

Country Link
JP (1) JPS57178447A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH025654A (en) * 1988-06-24 1990-01-10 Hitachi Cable Ltd Signal synchronization method
JPH02193433A (en) * 1989-01-23 1990-07-31 Nec Corp Warning detection system for loop type data transmitter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH025654A (en) * 1988-06-24 1990-01-10 Hitachi Cable Ltd Signal synchronization method
JPH02193433A (en) * 1989-01-23 1990-07-31 Nec Corp Warning detection system for loop type data transmitter

Also Published As

Publication number Publication date
JPS6352828B2 (en) 1988-10-20

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