JPS5675747A - Communication system by loop transmission system - Google Patents

Communication system by loop transmission system

Info

Publication number
JPS5675747A
JPS5675747A JP15194979A JP15194979A JPS5675747A JP S5675747 A JPS5675747 A JP S5675747A JP 15194979 A JP15194979 A JP 15194979A JP 15194979 A JP15194979 A JP 15194979A JP S5675747 A JPS5675747 A JP S5675747A
Authority
JP
Japan
Prior art keywords
loop
loop transmission
taking
frame information
state
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
JP15194979A
Other languages
Japanese (ja)
Inventor
Hideo Fukazawa
Michihiro Hamada
Yoshio Nakano
Naofumi Nagai
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
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
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, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP15194979A priority Critical patent/JPS5675747A/en
Publication of JPS5675747A publication Critical patent/JPS5675747A/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 speed up the switching of loop at failure, by taking a state of loop back mode at an upper side from a failed point and taking a state of return mode from the lower side. CONSTITUTION:The frame information is circulated via a loop transmission path 3-0. Further, the clock detection circuits 16-0-16-3 for loop transmission units 2-0- 2-3 monitor the circulation of the frame information. Further, when a disconnection is caused, the circuits 16-3 and 16-0 switch the return switching section S1. Next, the maintenance control adaptor 4 of the unit 2-0 designates the unit 2-2 to output the loop back control instruction and switches the loop back switching section S2. Thus, the disconnected position is automatically avoided to form the loop using transmission lines 3-0 and 3-1.
JP15194979A 1979-11-22 1979-11-22 Communication system by loop transmission system Pending JPS5675747A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15194979A JPS5675747A (en) 1979-11-22 1979-11-22 Communication system by loop transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15194979A JPS5675747A (en) 1979-11-22 1979-11-22 Communication system by loop transmission system

Publications (1)

Publication Number Publication Date
JPS5675747A true JPS5675747A (en) 1981-06-23

Family

ID=15529718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15194979A Pending JPS5675747A (en) 1979-11-22 1979-11-22 Communication system by loop transmission system

Country Status (1)

Country Link
JP (1) JPS5675747A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506357A (en) * 1981-03-25 1985-03-19 Hitachi, Ltd. Method and apparatus for switching loop type transmission lines
US4519070A (en) * 1984-01-19 1985-05-21 Burroughs Corporation Method of initializing and recovering from failures in a local area network
USRE37401E1 (en) 1990-05-09 2001-10-02 Fujitsu Limited Fault recovery system of a ring network

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506357A (en) * 1981-03-25 1985-03-19 Hitachi, Ltd. Method and apparatus for switching loop type transmission lines
US4519070A (en) * 1984-01-19 1985-05-21 Burroughs Corporation Method of initializing and recovering from failures in a local area network
USRE37401E1 (en) 1990-05-09 2001-10-02 Fujitsu Limited Fault recovery system of a ring network

Similar Documents

Publication Publication Date Title
KR850002722A (en) Transmission line control method
JPS5675747A (en) Communication system by loop transmission system
ES2084840T3 (en) PROCEDURE FOR THE CONNECTION OF SUBSTITUTION OF A DATA CURRENT.
US5073774A (en) One-to-one switching system
JPS57176850A (en) Transmitting system
JPS57132441A (en) Data way
JPS5567252A (en) Stand-by circuit switching system
JPS57185755A (en) Subscriber response detecting system
JPS6427334A (en) Duplex switching system
JPS6443041A (en) Automatic power distribution line monitoring device
JPS648748A (en) Line concentration device for duplicated loop type local area network
JPS5513570A (en) Automatic raising system of double central control units at trouble time
JPS55154844A (en) Light-source redundancy system of light repeater
FI875542A (en) FOERFARANDE FOER TESTNING AV EN ANSLUTNINGSENHET.
FR2603148A1 (en) Automatic telephone conversation recording system - detects presence of signal on telephone line to turn switch on to supply power to recorder
JPS6469126A (en) Redundant switching system for device taking cold standby
JPS57127253A (en) Switching system
JPS55100758A (en) Fault-point orientation system
JPS5758419A (en) Uninterruptible transmission line switching system
JPS6455934A (en) Interface switching system and circuit
JPS5765940A (en) Relieving system for station down in loop transmission processing system
JPS57125547A (en) Dataway extender
JPS54132110A (en) Circuit network switching system
JPS5792934A (en) Switching system for optical switch
JPS6454948A (en) Standby changeover system for communication control equipment