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JPS54105420A - Automatic selection system for transmission line - Google Patents

Automatic selection system for transmission line

Info

Publication number
JPS54105420A
JPS54105420A JP1276278A JP1276278A JPS54105420A JP S54105420 A JPS54105420 A JP S54105420A JP 1276278 A JP1276278 A JP 1276278A JP 1276278 A JP1276278 A JP 1276278A JP S54105420 A JPS54105420 A JP S54105420A
Authority
JP
Japan
Prior art keywords
office
transmission line
supervised
supervisory
offices
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
JP1276278A
Other languages
Japanese (ja)
Inventor
Masaya Yokochi
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 JP1276278A priority Critical patent/JPS54105420A/en
Publication of JPS54105420A publication Critical patent/JPS54105420A/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)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To enable a simple facility to select either loop transmission line, by sending office frequencies of two supervised offices at far-end sides to a supervisory office in a direction that one section each is overlapped. CONSTITUTION:Supervisory office S, and supervised offices A1 to A7 are connected in a loop as shown in the figure. Two supervised offices A3 and A4 at far-end sides send out office signals (f3) and (f4) to supervisory office S closkwise and counter- clockwise respectively. Supervisory office S allows receivers D3 and to D4 to receive those office signals to detect the fault of the transmission line. Namely, it can be detected that one of sections (1) to (3) when only signal (f4) can not be received, one of sections (5) to (8) when only signal (f3) can not be received, or section (4) when neither signal can be received gets out of order. Consequently, supervisory office S can communicate with a supervised office using a transmission line without fault.
JP1276278A 1978-02-06 1978-02-06 Automatic selection system for transmission line Pending JPS54105420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1276278A JPS54105420A (en) 1978-02-06 1978-02-06 Automatic selection system for transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1276278A JPS54105420A (en) 1978-02-06 1978-02-06 Automatic selection system for transmission line

Publications (1)

Publication Number Publication Date
JPS54105420A true JPS54105420A (en) 1979-08-18

Family

ID=11814402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1276278A Pending JPS54105420A (en) 1978-02-06 1978-02-06 Automatic selection system for transmission line

Country Status (1)

Country Link
JP (1) JPS54105420A (en)

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