JPS5792945A - Data highway monitoring system - Google Patents

Data highway monitoring system

Info

Publication number
JPS5792945A
JPS5792945A JP16779880A JP16779880A JPS5792945A JP S5792945 A JPS5792945 A JP S5792945A JP 16779880 A JP16779880 A JP 16779880A JP 16779880 A JP16779880 A JP 16779880A JP S5792945 A JPS5792945 A JP S5792945A
Authority
JP
Japan
Prior art keywords
loop back
transmission line
stand
terminal station
synchronization
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
JP16779880A
Other languages
Japanese (ja)
Other versions
JPS6360940B2 (en
Inventor
Osamu Morita
Naruhiro Hayashi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16779880A priority Critical patent/JPS5792945A/en
Publication of JPS5792945A publication Critical patent/JPS5792945A/en
Publication of JPS6360940B2 publication Critical patent/JPS6360940B2/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

Abstract

PURPOSE:To set a line even if the command from a monitor station is received erroneously, by inverting the loop back state when synchronization cannot be acquired for a constant time after the loop back to each terminal station, in the system where a current system and a stand-by system can perform the loop back independently of each other. CONSTITUTION:If a current transmission line 3-2 and a stand-by transmission line 4-2 are faulty together and a normal loop back command is not transferred from a monitor station 1 to each terminal station and a correct loop back is not performed, a control circuit 5 detects the impossiblility of acquisition of synchronization on transmission lines to start a timer 6-2. If synchronization is not restored when the timer 6-2 counts a predetermined constant time, the control circuit 5-2 inverts the folding state in a terminal station 2-2 to fold the transmission line from the stand-by transmission line to the current transmission line. Under this state, the loop back command of the stand-by system from the monitor station 1 is accepted by the terminal station 2-2, and thus, a line is set effectively.
JP16779880A 1980-11-28 1980-11-28 Data highway monitoring system Granted JPS5792945A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16779880A JPS5792945A (en) 1980-11-28 1980-11-28 Data highway monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16779880A JPS5792945A (en) 1980-11-28 1980-11-28 Data highway monitoring system

Publications (2)

Publication Number Publication Date
JPS5792945A true JPS5792945A (en) 1982-06-09
JPS6360940B2 JPS6360940B2 (en) 1988-11-25

Family

ID=15856298

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16779880A Granted JPS5792945A (en) 1980-11-28 1980-11-28 Data highway monitoring system

Country Status (1)

Country Link
JP (1) JPS5792945A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819045A (en) * 1981-07-27 1983-02-03 Fujitsu Ltd Data transmission line monitoring device
US6333915B1 (en) 1997-07-03 2001-12-25 Nec Corparation On-line line monitor system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819045A (en) * 1981-07-27 1983-02-03 Fujitsu Ltd Data transmission line monitoring device
JPH0119673B2 (en) * 1981-07-27 1989-04-12 Fujitsu Ltd
US6333915B1 (en) 1997-07-03 2001-12-25 Nec Corparation On-line line monitor system

Also Published As

Publication number Publication date
JPS6360940B2 (en) 1988-11-25

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