Communication network system and loopback control method
AssigneeKabushiki Kaisha Toshiba
InventorsAkira Hayama, Yoshiro Osaki
Life of this patent
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Abstract
A communication network system comprises ring systems (A, B, C, D) and a common node device 20 that is connected in common to ring circuits (5A, 5B, 5C, 5D) of each of the ring systems (A, B, C, D) and that gathers data from each of the ring circuits (5A, 5B, 5C, 5D) relaying it to a relay circuit 30. The common node device 20 accommodates virtual channel paths within all the ring circuits (5A, 5B, 5C, 5D) by means of a virtual path switching path. The relay transmission is realized by means of virtual path switching control that uses this common node device 20 and virtual channel switching control that uses each of the ring nodes within the ring circuits (5A, 5B, 5C, 5D).
Claims18
A communication network system, wherein a plurality of node devices and a control node device that controls said plurality of node devices are connected in a ring shape by means of ring circuits that can set a first communication path and a second communication path in a direction opposite to that of the first communication path and that during normal operation carries out transmission of data through the first communication path between each of the node devices or between communication terminals connected to each of the node devices,
- wherein the control node device comprises control means that issues loopback instructions or loopback release instructions to an arbitrary node device, and each of said plurality of node devices comprises control means which loopbacks the first communication path to the second communication path on both left and right sides of the ring circuits as seen from the devices themselves simultaneously based on the loopback instructions and which releases the loopback based on the loopback release instructions.
A loopback control method for a communication network system in which a plurality of node devices and a control node device that controls this plurality of node devices are connected in a ring shape by means of ring circuits that can set a first communication path and a second communication path in a direction opposite to that of the first communication path, and during normal operation transmission of data is carried out through the first communication path between each of the node devices or between communication terminals connected to each of the node devices, the loopback control method carrying out loopback and loopback release between the first communication path and the second communication path,
- wherein loopback instructions or loopback release instructions are issued to any of the node devices from the control node device, and each of the node devices loopbacks the first communication path to the second communication path on both left and right sides of the ring circuits as seen from the devices themselves simultaneously based on the loopback instructions and releases the loopback based on the loopback release instructions.
A communication network system, comprising:
- a plurality of ring systems each comprising a plurality of node devices connected by a ring-shaped ring circuit with communication being carried out between the node devices or between communication terminals connected to each of the node devices through the ring circuit;
- and
- a common node device arranged as a single node device common to each of the ring systems that accommodates the ring circuits of each of the ring systems and a relay circuit, the ring circuits and relay circuit being formed by virtual paths (VP) and virtual channels (VC) that are settable therein, wherein the common node device includes switching means that implements VP switching path settings for enabling switching and connecting all the VCs of the ring circuits of the ring systems to the VP of the relay circuit by means of the VPs of the ring circuits,
- wherein the VP switching path settings by the switching means forms, between the ring circuits of each of the ring circuits and the relay circuit, a first VP that unilaterally transmits communication data of the communication terminals arranged in each of the ring circuits, and a second VP having a direction reverse to that of the first VP in the ring circuits of each of the ring systems, whereby in a normal operation communication data on each of the ring circuits is relayed to the relay circuit via the VC in the first VP,
- wherein the common node device comprises control means that carries out a control to set a virtual control path to each of the node devices of each of the ring systems, and a control to issue a loopback control command or a loopback release control command through the virtual control path to each of the node devices of the ring system, and
- wherein each of the node devices comprises control means that loopbacks the first VP to the second VP on both left and right sides of the ring circuits as seen from the devices themselves simultaneously based on the loopback instructions and that releases the loopback based on loopback release instructions.
Dependencies are inferred from the claim text.