JPS55140345A - Communication line switching system - Google Patents

Communication line switching system

Info

Publication number
JPS55140345A
JPS55140345A JP4801079A JP4801079A JPS55140345A JP S55140345 A JPS55140345 A JP S55140345A JP 4801079 A JP4801079 A JP 4801079A JP 4801079 A JP4801079 A JP 4801079A JP S55140345 A JPS55140345 A JP S55140345A
Authority
JP
Japan
Prior art keywords
line
circuit line
circuit
loop
terminals
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
JP4801079A
Other languages
Japanese (ja)
Inventor
Kenta Takumi
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 JP4801079A priority Critical patent/JPS55140345A/en
Publication of JPS55140345A publication Critical patent/JPS55140345A/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 prevent the response time from a terminal from being long at a fault time, by providing two-system parallel-series signal conversion circuits in the host processor and by folding the working circuit line to the auxiliary circuit line in both sides of the faulty position at the fault time of the working circuit line. CONSTITUTION:Host processor 1 is provided with parallel-series conversion circuits 15 and 16 of the same function, and loop-form working circuit line 2 is connected to them, and terminals 4-7 are connected to this circuit line. Meanwhile, loop- form auxiliary circuit line 8 is arranged near circuit line 2. Respective terminals are connected to the circuit line through selector switches 11-14, and in processor 1, communication control circuit 17, circuits 15 and 16, and circuit lines 2 and 8 are connected through selector switches k7-k20, and k11'-k14'. In case that lines 2 as well as 8 are faulty at faulty point 9, selector switches are connected as shown by solid lines in the figure, and lines 2 and 8 are used as the going line and the returning line respectively between processor 1 and terminals 4 and 5, and terminals 6 and 7 constitute a loop-form circuit line with line 8 as the going line and line 2 as the returning line, thus shortening the loop length.
JP4801079A 1979-04-20 1979-04-20 Communication line switching system Pending JPS55140345A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4801079A JPS55140345A (en) 1979-04-20 1979-04-20 Communication line switching system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4801079A JPS55140345A (en) 1979-04-20 1979-04-20 Communication line switching system

Publications (1)

Publication Number Publication Date
JPS55140345A true JPS55140345A (en) 1980-11-01

Family

ID=12791320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4801079A Pending JPS55140345A (en) 1979-04-20 1979-04-20 Communication line switching system

Country Status (1)

Country Link
JP (1) JPS55140345A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5350608A (en) * 1976-10-20 1978-05-09 Hitachi Ltd Loop communication system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5350608A (en) * 1976-10-20 1978-05-09 Hitachi Ltd Loop communication system

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