JPS55154852A - Controller of loop communication channel - Google Patents

Controller of loop communication channel

Info

Publication number
JPS55154852A
JPS55154852A JP6145179A JP6145179A JPS55154852A JP S55154852 A JPS55154852 A JP S55154852A JP 6145179 A JP6145179 A JP 6145179A JP 6145179 A JP6145179 A JP 6145179A JP S55154852 A JPS55154852 A JP S55154852A
Authority
JP
Japan
Prior art keywords
message
communication channel
signal
transmitting
transmission
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
JP6145179A
Other languages
Japanese (ja)
Inventor
Kanman Hamada
Yasuo Kaminaga
Ikuro Masuda
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 JP6145179A priority Critical patent/JPS55154852A/en
Publication of JPS55154852A publication Critical patent/JPS55154852A/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 eliminate a bottle neck in terms of reliability by providing each control station with a synchronizing request signal sending method, message-transmission-right judging method and message-transmission-right single confirming method. CONSTITUTION:Respective control stations 3 are coupled with loop communication channel 1 via coupling part 2. To send out a synchronizing request signal for synchronization among stations 3, a signal on communication channel 1 is interrupted for a certain time by a signal from station fault detection circuit 7 in attendance on the ON-OFF operation of relay 5 and it is made sure that this repeated signal is connected for a certain time. Further, a message transmission supervisory timer checks whether the right of transmitting a message passed lately. After the right of transmitting a message is accepted, a test pattern is sent out to make sure that a frame making a tour via communication channel 1 is returned correctly, so that it is made sure that there are not two rights of transmitting a message or more residing on communication channel 1.
JP6145179A 1979-05-21 1979-05-21 Controller of loop communication channel Pending JPS55154852A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6145179A JPS55154852A (en) 1979-05-21 1979-05-21 Controller of loop communication channel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6145179A JPS55154852A (en) 1979-05-21 1979-05-21 Controller of loop communication channel

Publications (1)

Publication Number Publication Date
JPS55154852A true JPS55154852A (en) 1980-12-02

Family

ID=13171416

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6145179A Pending JPS55154852A (en) 1979-05-21 1979-05-21 Controller of loop communication channel

Country Status (1)

Country Link
JP (1) JPS55154852A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5781747A (en) * 1980-11-11 1982-05-21 Nec Corp Data transmission control system for loop transmission system
JPS5867949U (en) * 1981-10-30 1983-05-09 いすゞ自動車株式会社 Laminated gasket

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5781747A (en) * 1980-11-11 1982-05-21 Nec Corp Data transmission control system for loop transmission system
JPS5867949U (en) * 1981-10-30 1983-05-09 いすゞ自動車株式会社 Laminated gasket
JPS6347642Y2 (en) * 1981-10-30 1988-12-08

Similar Documents

Publication Publication Date Title
JPS6471344A (en) Radio communication system using synchronized frequency hopping transmission
ATE59254T1 (en) PROCEDURE AND ARRANGEMENT FOR TRANSMISSION OF DIGITAL DATA COMPOSITED IN MESSAGE FRAME.
AU621244B2 (en) Station-to-station full duplex communication in a communications network
KR930702822A (en) Data Packet Alignment in Communication Systems
FI934009A0 (en) FOERFARANDE FOER TRANSMITTERING AV INFORMATION MED FOERTIMING TILL EN I ETT CELLULAERT RADIOTELEFONNAET ROERLIG TELEAPPARAT, TELEAPPARAT, KONTROLLER SAMT SYSTEM FOER OMVANDLING AV INFORMATION I SAODAN PROCESS
JPS58131829A (en) Radio relay system
US5408517A (en) Method and apparatus for handoff synchronization
JPS55154852A (en) Controller of loop communication channel
JPS61107826A (en) Mobile radio communication system
JPS6439845A (en) Data transmission equipment
JPS56112156A (en) Loop communication system
JPS56104558A (en) Switching system of multitransmission line
JPS5685942A (en) Mobile radio communication system
JPS54107617A (en) Monitoring method for transmission system
JPS5720051A (en) Reception switching system of digital radio system
JPS5577251A (en) Time-division multi-directional multiplex transmission system
DE3061939D1 (en) Method for locating troubles on a communication line without using addresses
JPS5757076A (en) Terminal equipment in simple data communication system
JP3197334B2 (en) Base station monitoring device
JPS55110452A (en) Data transmission method
JPS645147A (en) Location device for faulty point
JPS6441540A (en) Connection test system for local area network system
JPS5671351A (en) Separation system for terminal station in loop shape transmission processing system
JPS56128049A (en) Data communication system
JPS5732148A (en) Charging-system transmission system of mobile communication system