Patent EP0280231A2 successfully refreshed from Google Patents.
EP0280231A2
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EP
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Method and apparatus for detecting fault in ring network data transmission system
Assignee: Hitachi Ltd
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Filing: 1988-02-22
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Granted: —
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Expires: 2008-02-22
Abstract
Abstract A ring network data transmission system includes a plurality of transmission apparatuses (1, ..., N), terminals (1 a , ... , N c ) each connected to each of the transmission apparatuses and double ring trans- mission paths (O a , O b ) interconnecting the transmission apparatuses in a ring-like system configuration so that terminals can communicate with one another through the associated transmission apparatuses. When transmission faulty occurs in the network, the transmission apparatus which can serve as the master station issues to all of the other transmission apparatuses a command for searching the fault location. In response to the reception of the command, each of the other transmission apparatuses sends out a monitor signal containing its own address and at the same time checks the monitor signal as received. Through collation of the address contained in the received monitor signal with the address information arrayed in the order in which the transmission apparatuses are interconnected, the number of bypassed transmission apparatuses existing between each transmission apparatus and the transmission apparatus sending out the monitor signal is determined. By comparing this number with a predetermined maximum permissible number of the stages allowable to be bypassed, the faulty location is detected. With such an operation, automatic reconfiguration operation of double ring network can be stabilized.
Inventors
- 👤 Takuji Hamada
- 👤 Masahiro Takahashi
- 👤 Katsuhiko Yoneda
- 👤 Ken Onuki
- 👤 Toshihiko Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:41
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/437
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A method of detecting a faulty location in a ring network system including a plurality of trans- mission apparatus (1, ..., N), terminals (1a, ..., Na) connected to each of said transmission apparatuses and double ring transmission paths (02. O b ) for interconnecting said transmission apparatuses in a ring-like configuration so that any given ones of said terminals can communicate with each other by way of the respective associated transmission apparatuses, comprising the steps of: searching address of adjacent one of said transmission apparatuses; determining arithmetically the stage numbers of bypassed transmission apparatuses on the basis of said address of said adjacent transmission apparatus and predetermined addresses indicating an order in which the transmission apparatuses are connected; and comparing said arithmetically determined number of bypassed transmission apparatuses with a predetermined maximum number of the transmission apparatuses allowable to be bypassed to thereby detect the faulty location in said ring network system.
Claim 2
Independent Claim
152 words
A method of detecting a faulty location in a ring network system including a plurality of trans- mission apparatus (1, ..., N), terminals (1a, ..., Na) connected to each of said transmission apparatuses and double ring transmission paths (02. O b ) for interconnecting said transmission apparatuses in a ring-like configuration so that any given ones of said terminals can communicate with each other by way of the respective associated transmission apparatuses, comprising the steps of: searching address of adjacent one of said transmission apparatuses; determining arithmetically the stage numbers of bypassed transmission apparatuses on the basis of said address of said adjacent transmission apparatus and predetermined addresses indicating an order in which the transmission apparatuses are connected; and comparing said arithmetically determined number of bypassed transmission apparatuses with a predetermined maximum number of the transmission apparatuses allowable to be bypassed to thereby detect the faulty location in said ring network system.
Claim 3
Independent Claim
230 words
A method of detecting a faulty location in a ring network system including a plurality of trans- mission apparatuses, terminals connected to each of said transmission apparatuses and double ring transmission paths for interconnecting said trans- mission apparatuses in a ring-like configuration so that any given ones of said terminals can communicate with each other by way of the respective associated transmission apparatuses, wherein each of said transmission apparatuses includes bypass means (10) for causing said ring transmission path to bypass the transmission apparatus, route change-over means (20) for changing over connecting relation between said transmission apparatus and said double-ring transmission path (O a , O b ), configuration control means (40) for controlling indexing operation for indexing a faulty location and information transfer means (30) for performing information transfer with the configuration control means of other transmission apparatus, said method comprising steps of: searching the address of the adjacent transmission apparatus; collating said searched address with address information arrayed in a predetermined order in which the transmission apparatuses are connected in said ring network to thereby determine the number of stages bypassed before reaching said adjacent transmission apparatus; and comparing the nunber of the bypassed stages with a predetermined number of stages allowed to be bypassed to thereby detect the faulty location in said ring network; said steps being carried out under the control of said configuration control means.
Claim 4
Independent Claim
230 words
A method of detecting a faulty location in a ring network system including a plurality of trans- mission apparatuses, terminals connected to each of said transmission apparatuses and double ring transmission paths for interconnecting said trans- mission apparatuses in a ring-like configuration so that any given ones of said terminals can communicate with each other by way of the respective associated transmission apparatuses, wherein each of said transmission apparatuses includes bypass means (10) for causing said ring transmission path to bypass the transmission apparatus, route change-over means (20) for changing over connecting relation between said transmission apparatus and said double-ring transmission path (O a , O b ), configuration control means (40) for controlling indexing operation for indexing a faulty location and information transfer means (30) for performing information transfer with the configuration control means of other transmission apparatus, said method comprising steps of: searching the address of the adjacent transmission apparatus; collating said searched address with address information arrayed in a predetermined order in which the transmission apparatuses are connected in said ring network to thereby determine the number of stages bypassed before reaching said adjacent transmission apparatus; and comparing the nunber of the bypassed stages with a predetermined number of stages allowed to be bypassed to thereby detect the faulty location in said ring network; said steps being carried out under the control of said configuration control means.
Claim 5
Dependent Claim
81 words
A method of detecting a faulty location in a ring network according to claim 1, the search of the address of the adjacent transmission apparatus being realized in such a manner that said configuration control means sends out information containing the address of the associated transmission apparatus to the configuration control means of all the other transmission apparatuses, wherein the address contained in the information received by the configuration control means is regarded as the address of the adjacent transmission apparatus.
Claim 6
Dependent Claim
58 words
A method of detecting a faulty location in a ring network according to claim 2, wherein when said configuration control means detects that the number of the bypassed stages exceeds said maximum allowable bypassed stage number, said configuration control means issues a command to said route change-over means for disconnecting the corresponding transmission apparatus from said ring network.
Claim 7
Dependent Claim
245 words
A data transmission system of ring network, comprising a plurality of transmission apparatuses (1, ..., N), terminals (1a, .... N c ) connected to each of said transmission apparatuses and double ring transmission paths (O a , O b ) for interconnecting said transmission apparatus in a ring-like configuration so that any given ones of said terminals can communicate with each other by way of the respective associated transmission apparatuses, wherein each of said transmission apparatuses includes bypass means (10) for causing said ring transmission path to bypass the transmission apparatus, route change-over means (20) for changing over connecting relation between said transmission apparatus and said double-ring transmission path, configuration control means (40) for controlling said route change-over means and indexing operation for locating a faulty portion, and information transfer means (30) for performing information transfer with the configuration control means of other trans- mission apparatus, storage means (42) for storing the order in which the transmission apparatuses are connected in said ring network, and configuration control means (40) for searching the address of the currently adjacent transmission apparatus, collating the searched address vith address information arrayed in a predetermined order in which the transmission apparatuses are connected in said ring network to thereby determine the number of stages bypassed before reaching said currently adjacent transmission apparatus, and comparing the number of the bypassed stages with a predetermined number of stages allowed to be bypassed to thereby detect the faulty portion within said ring network.
Claim 8
Dependent Claim
245 words
A data transmission system of ring network, comprising a plurality of transmission apparatuses (1, ..., N), terminals (1a, .... N c ) connected to each of said transmission apparatuses and double ring transmission paths (O a , O b ) for interconnecting said transmission apparatus in a ring-like configuration so that any given ones of said terminals can communicate with each other by way of the respective associated transmission apparatuses, wherein each of said transmission apparatuses includes bypass means (10) for causing said ring transmission path to bypass the transmission apparatus, route change-over means (20) for changing over connecting relation between said transmission apparatus and said double-ring transmission path, configuration control means (40) for controlling said route change-over means and indexing operation for locating a faulty portion, and information transfer means (30) for performing information transfer with the configuration control means of other trans- mission apparatus, storage means (42) for storing the order in which the transmission apparatuses are connected in said ring network, and configuration control means (40) for searching the address of the currently adjacent transmission apparatus, collating the searched address vith address information arrayed in a predetermined order in which the transmission apparatuses are connected in said ring network to thereby determine the number of stages bypassed before reaching said currently adjacent transmission apparatus, and comparing the number of the bypassed stages with a predetermined number of stages allowed to be bypassed to thereby detect the faulty portion within said ring network.
Claim 9
Dependent Claim
75 words
A data transmission system according to claim 5, the search of the address of the currently adjacent transmission apparatus being realized in such a manner that said configuration control means sends out information containing the address of the associated transmission apparatus to the configuration control means of all the other transmission apparatuses, wherein the address contained in the information received by the configuration control means is regarded as the address of the adjacent transmission apparatus.
Claim 10
Dependent Claim
52 words
A data transmission system according to claim 5, wherein when said configuration control means detects that the number of the bypassed stages exceeds said maximum allowable bypassed stage number, said configuration control means issues a command to said route change-over means for disconnecting the corresponding trans- mission apparatus from said ring network.
Claim 11
Dependent Claim
32 words
A data transmission system according to claim 5, wherein said storage means stores therein a predetermined maximum permissible number of stages allowable to be bypassed before reaching the currently adjacent transmission apparatus.
Claim 12
Dependent Claim
34 words
A data transmission system according to claim 5, wherein collation is performed for determining whether said number of the by-passed stages is greater than said predetermined permissible number of stages allowable to be by-passed.
References Cited (Backward Citations)
No citation records indexed.
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