Communication network system and rebuilding method thereof
AssigneeKabushiki Kaisha Toshiba
InventorKiyotaka Tsuji
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Abstract
A communications network system capable of reducing the time from the occurrence of a trouble to the rebuilding of the system and a rebuilding method thereof. In a communications network system which comprises a plurality of node devices (10-1 to 10-4) distributed at a plurality of positions and transmission lines (1a, 1b) for connecting the plurality of node devices, one of the plurality of node devices is set as a master station (10-1) to operate the system, when the master station has a trouble, the individual node device makes an inquiry to the other node devices, and a node device which has confirmed that no other node device has a higher priority than itself becomes a substitute master station to take the place of the troubled master station to continue the operation of the system.
Claims14
A communications network system including a plurality of node devices distributed at a plurality of positions and transmission lines for connecting the plurality of no node devices in a ring-shaped configuration, one of the plurality of node devices being set as a master station to operate the system, wherein each node device comprises:
- detection means for detecting a trouble by determining that a monitor signal from the master station was not received;
- inquiring means for making an inquiry in an asynchronous transmission mode among the respective node devices when the detection means detects that the trouble has occurred with the master station;
- confirming means for confirming that there is no node device having a higher priority than itself based on an inquired result by the inquiring means;
- and
- master station setting means for setting the node device, if the confirming means confirmed that there is no node device having a higher priority than itself, as a substitute master station in place of the troubled master station.
A communications network system including a plurality of node devices distributed at a plurality of positions and transmission lines for connecting the plurality of node devices in a ring-shaped configuration, one of the plurality of node devices being set as a master station to operate the system, wherein each node device comprises:
- detection means for detecting a trouble by determining that a monitor signal from the master station was not received;
- judging means for judging when the detection means has detected that the trouble has occurred in the master station, whether its own node device is adjacent to the troubled master station;
- and
- master station setting means, when the judging means has judged that the own node device is adjacent to the troubled master station, for judging whether the own node device has a higher priority than other node device which is also next to the troubled master station and setting the node device which was judged to have the high priority as a substitute master station in place of the troubled master station.
A method for rebuilding a communications network system in which a plurality of node devices distributed at a plurality of positions are connected in a ring-shaped configuration by transmission lines, one of the plurality of node devices being set as a master station to operate the system, and wherein the system is rebuilt when a trouble occurs with the master station, the method comprising the steps of:
- making an inquiry in an asynchronous transmission mode among the node devices when the trouble has occurred with the master station;
- and
- determining one of the plurality of node devices, which has no node devices with a higher priority than itself, as a substitute master station which operates the system instead of the troubled master station.
A method for rebuilding a communications network system in which a plurality of node devices distributed at a plurality of positions are connected in a ring-shaped configuration by transmission lines, one of the plurality of node devices being set as a master station to operate the system, and wherein the system is rebuilt when a trouble has occurred in the master station, the method comprising the steps of:
- at least one of the plurality of node devices judging, when the trouble has occurred with the master station, whether, it is next to the troubled master station;
- when judged that the node device is adjacent to the troubled master station, judging whether the node device has a higher priority than other node device which is also next to the troubled master station;
- and
- setting the node device, which was judged to have a higher priority than the other node device next to the troubled master station, as a substitute master station in place of the troubled master station.
Dependencies are inferred from the claim text.