EP0091129A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Reconfiguration control method for a loop-type data network
Assignee: Hitachi Ltd
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Filing: 1983-04-06
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Granted: —
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Expires: 2003-04-06
Abstract
Abstract This invention discloses a loop-back control method for loop-type data transmission systems in which, when a trouble occurs on both transmission lines of two systems (3, 4), two stations (2) adjacent to the trouble region return signals toward a control station (1) in response to a command from the control station, thereby to separate the trouble region and continue the operation. According to this invention, when the control station detects the occurrence of a trouble on the transmission lines of the two systems, it sends out a broadcast command for searching the trouble point to the transmission lins of both systems and thereafter a loop-back command so that the stations adjacent to the trouble point can take the loop-back constitution.
Inventors
- 👤 Takuji Hamada
- 👤 Masahiro Takahashi
- 👤 Sadao Mizokawa
- 👤 Hitoshi Fushimi
- 👤 Seiichi Yasumoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 04:33
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/437; H04B; H04B1/00; H04B1/74
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A loop-back control method for a loop-type data transmission system comprising the first and the second transmission lines (3, 4) in opposite transmission directions and a plurality of stations (2) and at least one control station (1) connected to said transmission lines in the form of a loop, wherein when a trouble occurs on said two loops, two stations adjacent to the troubled region bend back signals in accordance to a command from said control station in order to separate said trouble region and continue the transmission, and wherein said control station for detecting the occurence of a trouble on both of said transmission lines first generates a broadcast command for searching said troubled point to said two systems of transmission lines and thereafter said two station-adjacent to said troubled point send out a loop-back command for forming the loop-back constitution.
Claim 2
Dependent Claim
141 words
A loop-back control method for a loop-type data transmission system comprising the first and the second transmission lines (3, 4) in opposite transmission directions and a plurality of stations (2) and at least one control station (1) connected to said transmission lines in the form of a loop, wherein when a trouble occurs on said two loops, two stations adjacent to the troubled region bend back signals in accordance to a command from said control station in order to separate said trouble region and continue the transmission, and wherein said control station for detecting the occurence of a trouble on both of said transmission lines first generates a broadcast command for searching said troubled point to said two systems of transmission lines and thereafter said two station-adjacent to said troubled point send out a loop-back command for forming the loop-back constitution.
Claim 3
Dependent Claim
83 words
A loop-back control method for a loop-type data transmission system according to Claim 1, wherein said each station passes through said broadcast command from said control station, sends out continually a monitor signal different from a normal data signal to the one transmission line with the direction opposite to that of the other transmission line, receives the monitor signal sent out from other stations and stops the transmission of this monitor signal from itself so that each station can identify the trouble point.
Claim 4
Dependent Claim
57 words
A loop-back control method for a loop-type data transmission system according to Claim 2, wherein said each station responds to the loop-back command sent out from said control station and returns the information received from the transmission line by which said station detctes said loop-back command only when said station has been sending out said monitor signal.
Claim 5
Dependent Claim
35 words
A loop-back control method for a loop-type data transmission system according to Claim 1, wherein said broadcast command and said loop-back command are continually sent out several times to perform trouble search and loop-back constitution.
Claim 6
Dependent Claim
101 words
A loop-back control method for a loop-type data transmission system according to Claim 3, wherein said each station comprises first and second memory means (53, 54) for storing the transmission line through which said broadcase command for trouble search is transmitted from said control station and a third memory means (57) for storing the presence of a loop-back command after said broadcast command and identifies a transmission line on which said monitor signal is transmitted and also a transmission line on which said data signal is bent back in accordance with the contents of said first, second and third memory means.
Claim 7
Dependent Claim
44 words
A loop-back control method for a loop-type data transmission system according to Claim 5, wherein said first and second memory means reset their memory states by the receipt of a data signal and a monitor signal from the transmission line of the other system.
Claim 8
Dependent Claim
36 words
A loop-back control system for a loop-type data transmission system according to Claim 5, wherein said third memory means resets its memory state when the data signals from said first and second transmission lines are absent.
Claim 9
Dependent Claim
105 words
A loop-back control method for a loop-type data transmission system according to Claim 2, wherein said each station comprises a microcomputer (MC100) having a function of receiving data from other stations and transmitting data to other stations, a multiplexer (30) connecting said microcomputer to said first and second transmission lines and first and second detectors (28, 25) connected to said first and second transmission lines respectively to detect the recept of data from the respective transmission lines; and said multiplexer is controlled to decide, depending on the outputs of said first and second detectors, which data on both of said transmission lines should be recieved.
References Cited (Backward Citations)
No citation records indexed.
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