JPS6412636A - Loopback control system - Google Patents

Loopback control system

Info

Publication number
JPS6412636A
JPS6412636A JP62166922A JP16692287A JPS6412636A JP S6412636 A JPS6412636 A JP S6412636A JP 62166922 A JP62166922 A JP 62166922A JP 16692287 A JP16692287 A JP 16692287A JP S6412636 A JPS6412636 A JP S6412636A
Authority
JP
Japan
Prior art keywords
transmission line
discrimination
main
fault
main 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
JP62166922A
Other languages
Japanese (ja)
Inventor
Koji Kobayashi
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.)
Azbil Corp
Original Assignee
Azbil 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 Azbil Corp filed Critical Azbil Corp
Priority to JP62166922A priority Critical patent/JPS6412636A/en
Publication of JPS6412636A publication Critical patent/JPS6412636A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To contrive eliminate the need for a supervising device and to facilitate the entire constitution change and the extension by connecting plural communication equipments in a ring shape in a main transmission line and a sub transmission line in which the signal transmission direction is opposite to each other, using only the main transmission line in the normal state and using both the main and sub transmission lines if a fault takes place in the main transmission line. CONSTITUTION:In the event of a fault in a main transmission line 1, a master station 3a applies transmission/reception of a test signal to both adjacent slave stations 3b, 3d individually, the slave stations adjacent to each other (3b-3d) apply the transmission/reception of a test signal sequentially individually, a fault location is discriminated based on the result and loopback connection is applied in response to the discrimination. Thus, the discrimination of the fault location and the discrimination as to whether the loopback connection is applied or not are implemented by each station independently. Thus, no monitor is required and the extension and configuration change as the whole system are facilitated.
JP62166922A 1987-07-06 1987-07-06 Loopback control system Pending JPS6412636A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62166922A JPS6412636A (en) 1987-07-06 1987-07-06 Loopback control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62166922A JPS6412636A (en) 1987-07-06 1987-07-06 Loopback control system

Publications (1)

Publication Number Publication Date
JPS6412636A true JPS6412636A (en) 1989-01-17

Family

ID=15840141

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62166922A Pending JPS6412636A (en) 1987-07-06 1987-07-06 Loopback control system

Country Status (1)

Country Link
JP (1) JPS6412636A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05102990A (en) * 1991-06-27 1993-04-23 Nec Corp Transmission line switching system
JP2008017263A (en) * 2006-07-07 2008-01-24 Oki Electric Ind Co Ltd Communication network

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5756060B2 (en) * 1975-10-24 1982-11-27
JPS59122029A (en) * 1982-12-21 1984-07-14 Fujitsu Ltd Fault monitoring system
JPS59148450A (en) * 1983-02-14 1984-08-25 Mitsubishi Electric Corp Data transmitter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5756060B2 (en) * 1975-10-24 1982-11-27
JPS59122029A (en) * 1982-12-21 1984-07-14 Fujitsu Ltd Fault monitoring system
JPS59148450A (en) * 1983-02-14 1984-08-25 Mitsubishi Electric Corp Data transmitter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05102990A (en) * 1991-06-27 1993-04-23 Nec Corp Transmission line switching system
JP2008017263A (en) * 2006-07-07 2008-01-24 Oki Electric Ind Co Ltd Communication network

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