Azbil Corporation

Yamatake Corporation

Wei Jiang

Atsushi Seita

Hideki Tashiro

Ring type switchesX,Y that connect to two sub-ringsare provided to maintain Ethernet communications between sub-rings even when a fault occurs in a ring type switch. By carrying out redundant control processing based on the operating status of itself and the companion in these ring type switchesX,Y, one operates as the currently used system and carries out relay connections between the sub-ringsand the other operates as a standby system and stops relay connections between the sub-rings

Ring type ethernet system, ring type switch, ring connection control circuit, ring type ethernet system control method, ring type switch control method and ring connection control method

If either of the MAC processing units in one of the ring connection control circuits receives a MAC frame that includes control information for the redundancy control process related to one of the subrings from that subring, then output of the relevant MAC frame to the transfer processing unit is restricted and the relevant MAC frame is output to the STP processing unit.

Ring connection control circuit, ring switching hub, ring ethernet system, and ring connection controlling method

The invention can achieve a recovery time that satisfies the demands of real-time transmission processing by performing, in an extremely short time period, an RSTP process in a network, which is configured in a ring topology and wherein a plurality of IEEE 802.3 compliant nodes is connected via prescribed transmission lines, using hardware to execute processes related to the physical layer and the data link layer of the OSI reference model&#x2014;without software processing. The RSTP processing unit of each node: receives BPDU data, which is received from the network by one of two PHY units and stored in a BPDU send/receive buffer of a corresponding MAC unit that is connected to that PHY unit, via a BPDU data bus that is connected to that MAC unit; decodes the received BPDU data; performs a prescribed process; transfers the BPDU data, via the BPDU data bus that is connected to the other MAC unit, to the other BPDU send/receive buffer; and transmits that BPDU data from the PHY unit connected to the other MAC unit to the network.

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Tokyo, Japan

Wei Jiang