Packet ring network system, packet transfer system,...

Details Packet ring network system, packet transfer system,... Packet ring network system, packet transfer system,...

2007-01-05

2011-12-06

Ngo, Ricky (Department: 2464)

Multiplex communications

Fault recovery

Bypass an inoperative station

C370S254000

Reexamination Certificate

active

08072878

ABSTRACT:
In a ring network to which a plurality of nodes are connected, even though a failure occurs in a link between a node and a client apparatus (a user terminal) or a node itself, communication between the node and the client apparatus can be achieved. Nodes (105a) and (105b) are provided, so that, even though a failure occurs at either one of the nodes in the link between the node and the client apparatus (102), communication can be done between the other node and the client apparatus (102) through the link. When the node (105a) has a failure, the node (105b) succeeds in operation of the node (105a) while the node (105a) holds a state of the node (105a) to avoid a steering operation or a lap protection operation, a packet disappearance in the packet ring caused by the operation, influence of traffics a packet route change, etc., consumption of CPU and memory resources, and a ring transfer band reduction.

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“IEEE Standards 802. 17, Part 17: Resilient packet ring (RPR) access method & physical layer specifications”, “5. Architecture Overview”, “6.6.1 MAC Control sublayer”, 9. Frame formats, IEEE (Institute of Electrical and Electronics Engineers, Inc), 2004, p. 27-54, p. 68-69, p. 221-223.

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