JPS5458302A - Backup unit for loop communication line - Google Patents

Backup unit for loop communication line

Info

Publication number
JPS5458302A
JPS5458302A JP12438477A JP12438477A JPS5458302A JP S5458302 A JPS5458302 A JP S5458302A JP 12438477 A JP12438477 A JP 12438477A JP 12438477 A JP12438477 A JP 12438477A JP S5458302 A JPS5458302 A JP S5458302A
Authority
JP
Japan
Prior art keywords
line
open wire
communication line
backup unit
loop communication
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
JP12438477A
Other languages
Japanese (ja)
Inventor
Makoto Yamamoto
Masami Tamura
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 JP12438477A priority Critical patent/JPS5458302A/en
Publication of JPS5458302A publication Critical patent/JPS5458302A/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 minimize the line cost and to increase the reliability, by selecting the line to spare line at failure, through the provision of the open wire detecting circuit and the selector switch with the station requiring duplex system. CONSTITUTION:The external lines excluding the stations A to C, D to E and F to G in the same area are duplexed, and the open wire detection circuits 3 and 4 provided with the stations connected to the external lines detect open wire every master line M and back up line N, the detection signal operating the selector switches 5 and 6 respectively and the connection change from the open wire side line to the normal line side is made.
JP12438477A 1977-10-19 1977-10-19 Backup unit for loop communication line Pending JPS5458302A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12438477A JPS5458302A (en) 1977-10-19 1977-10-19 Backup unit for loop communication line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12438477A JPS5458302A (en) 1977-10-19 1977-10-19 Backup unit for loop communication line

Publications (1)

Publication Number Publication Date
JPS5458302A true JPS5458302A (en) 1979-05-11

Family

ID=14884064

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12438477A Pending JPS5458302A (en) 1977-10-19 1977-10-19 Backup unit for loop communication line

Country Status (1)

Country Link
JP (1) JPS5458302A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6367941A (en) * 1986-09-10 1988-03-26 Hitachi Ltd Fault detouring system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6367941A (en) * 1986-09-10 1988-03-26 Hitachi Ltd Fault detouring system

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