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| Number | Title | Issue Date |
| 8179787 | Fault tolerant network utilizing bi-directional point-to-point communications links between nodes A data communication system and an associated network node implementation is disclosed that, in certain embodiments, uses single-channel bi-directional communication links between nodes to send frames of data. The network nodes can be connected together in a ring or... | 05/15/2012 |
| 8169895 | Network system and node The invention realizes defect indication on a multipoint logical path and switching of the logical path using a transfer protocol of configuring a logical path in a ring network. A working path and a backup path are set up where each transmits a frame from a transmi... | 05/01/2012 |
| 8159936 | Network convergence in response to a topology change In response to a network topology change, packets are initially flooded on ports of a network device. In addition, a bit array is cleared in response to the topology change. Each bit in the bit array is associated with a particular forwarding entry on the network de... | 04/17/2012 |
| 8149692 | Ring topology discovery mechanism A method automatically discovers a topology of a communication network ring. The ring includes a plurality of nodes. Each node includes a first port and a second port. A ring topology request or a response to the ring topology request is received from at least one n... | 04/03/2012 |
| 8134918 | Fibre channel switching fabric hub The Fiber Channel standard was created by the American National Standard for Information Systems (ANSI) X3T11 task group to define a serial I/O channel for interconnecting a number of heterogeneous peripheral devices to computer systems as well as interconnecting th... | 03/13/2012 |
| 8107362 | Multi-ring resilient packet ring add/drop device A Resilient Packet Ring (RPR) add/drop device to connect multiple rings, e.g. SDH/SONET rings, wavelength or fibers, to a single switch or router device is disclosed. The add/drop device according to the invention comprises two multiplexing framer devices and an Add... | 01/31/2012 |
| 8089864 | Network restoration A method of restoring an active path between two nodes of a transport network upon occurrence of a failure includes the steps of determining an alternate path through the network and establishing a path protection involving the failed active path and the alternate p... | 01/03/2012 |
| 8018841 | Interworking an ethernet ring network and an ethernet network with traffic engineered trunks Interworking an Ethernet Ring network with an Ethernet network with traffic engineered trunks (PBT network) enables traffic engineered trunks to be dual homed to the Ethernet ring network to enable for protection switching between active and backup trunk paths in th... | 09/13/2011 |
| 8004966 | Efficient management of ring networks In general, techniques are described for efficient management of ring networks with a system of two network devices. The first network device of the ring network is designated as an adjacent selective forwarding (ASF) device, and the second network device is designa... | 08/23/2011 |
| 7990850 | Redundant Ethernet automatic protection switching access to virtual private LAN services Embodiments disclosed herein provide redundant connectivity between an Ethernet Automatic Protection Switching (EAPS) access network and a Virtual Private LAN Service (VPLS) network. A first VPLS node is provided to function as an EAPS controller node. A second VPLS... | 08/02/2011 |
| 7986619 | Packet network system A system enabling inter-ring network connection when a plurality of ring networks are connected via a redundancy network, that is, a packet network system configured by a plurality of ring networks and redundancy networks linking the plurality of ring networks. This... | 07/26/2011 |
| 7983154 | Method for increasing/reducing band data rate of ring-based network and node apparatus of the ring-based network The present invention discloses a method including the steps of a) confirming the status of a path corresponding to each node apparatus in the ring network by using a predetermined control information that includes a function of adding/deleting a predetermined path ... | 07/19/2011 |
| 7957270 | Resilient packet ring protection over a wavelength division multiplexing network A method and system for provisioning a Resilient Packet Ring (“RPR”) over a Wavelength Division Multiplexing (“WDM”) network is disclosed. A plurality of stations send data packets to each other over a dual ring fiber optic link. The data packets travel over... | 06/07/2011 |
| 7944815 | System and method for network recovery from multiple link failures Methods and systems for fast and reliable network recovery from multiple link failures. In accordance with one example of the method, a master node receives a request from a transit node having a blocked port to open the blocked port for data forwarding, wherein the... | 05/17/2011 |
| 7929426 | Apparatus and method for designing ring covers A system and method are provided for designing ring cover candidates for a network. A ring cover candidate is generated based on configuration information and traffic demand information associated with the network. The ring cover candidate includes a group of rings,... | 04/19/2011 |
| 7924707 | Method for realizing many to many protection switching of ring network A method for realizing many to many protection switching operation of ring network including: determining information of a switch request of M:N protection switching of the ring network, a destination node of the switch request, a source node of the switch request, ... | 04/12/2011 |
| 7920464 | Method of redundancy of ring network A ring network redundancy method is disclosed. If somewhere the connection of the ring network is damaged and broken, then the state of an initially blocked port that has been assigned as blocked is set as forward so as to keep the network functioning. And after the... | 04/05/2011 |
| 7916630 | Monitoring condition of network with distributed components In a system having distributed components arranged in a logical ring structure, each component monitors only their respective neighboring component in the structure and the condition of the neighboring component is determined. If a component determines a condition o... | 03/29/2011 |
| 7898942 | Ring network system, failure recovery method, failure detection method, node and program for node In a multi-ring network with a plurality of rings to which RPR is applied connected, high-speed failure recovery is enabled when a failure occurs between the rings. The contact nodes 700-1 and 700-3 connected to the living inter-link 5... | 03/01/2011 |
| 7894336 | Breakdown and decoupling tolerant communications network, a data path switching device and a corresponding method The invention relates to a method for tolerating the breakdown and/or decoupling of at least one network node in a communication network used for controlling and/or adjusting the movement of a plurality of machine parts, for example the rotation bodies in a printing... | 02/22/2011 |
| 7885182 | Method for fast recovery from ring protection switches on DOCSIS networks The range delay of each of a plurality of user devices of an HFC is monitored. If the delay of a number of devices shifts by about the same amount and at about the same time, then the number of devices having such a shift is compared to a predetermined threshold. If... | 02/08/2011 |
| 7876673 | Prevention of frame duplication in interconnected ring networks A method for communication includes, in a communication network that includes multiple ring nodes arranged in at least first and second ring networks that are connected by two or more of the ring nodes serving as interconnect nodes, accepting at the two or more inte... | 01/25/2011 |
| 7852754 | Method and apparatus for managing faults in a ring network A method of managing faults in a ring network may include configuring a ring network to be in a “horseshoe” topology by disabling a communications link from distributing media between a selected pair of adjacent nodes while allowing other communications or non-r... | 12/14/2010 |
| 7848228 | Communication system, communication card, and communication method A communication system that enhances the efficiency of network operations in response to a request for a transfer bandwidth increased locally. A physical links are installed at a span where a transfer bandwidth is locally increased in a network, and the physical lin... | 12/07/2010 |
| 7843812 | Relay apparatus capable of preventing mistaken learning of MAC address learning table A relay apparatus includes a MAC (Media Access Control) address learning table for recording transfer destinations for frames. The relay apparatus is connected to other relay apparatuses to compose a network of a ring redundancy method. The relay apparatus includes ... | 11/30/2010 |
| 7839770 | Branch element for operation in a communication network, network and method for operating the branch element A branch element is specified for use in a communication network, whereby in the interplay of two branch elements designed according to the invention, a cleared fault in a communication medium stretching between the two branch elements, in particular a line, with a ... | 11/23/2010 |
| 7830789 | Method for accommodating signal paths to ring network According an aspect of the embodiment, there is provided a method for accommodating signal paths to a ring network. A demand chain is defined as a series of traffic demands in which each traffic demand shares one of the pair of terminal nodes pointed thereby with at... | 11/09/2010 |
| 7801028 | Method and apparatus for transparent auto-recovery in chain and ring networks The invention described herein provides a system and method for fault isolation and auto-recovery in chained loop or ring networking systems (103). According to aspects of the method and the associated path-selection algorithms described, fault isolation and ... | 09/21/2010 |
| 7796502 | Method and device for implementing Och-Spring in wavelength division multiplexing systems The present invention discloses a method and device for implementing Och-SPRing in Wavelength Division Multiplexing system. The method includes: in the node of the optical network system, setting two switches in each working path and its backup path that pass throug... | 09/14/2010 |
| 7773501 | Label assignment algorithm with receive-side processing implementation The present invention is directed towards systems and methods of routing payload data in a communications system. Specifically, the payload data is routed using a source address. The destination node(s) utilize a dynamically-stored look-up table indicating the sourc... | 08/10/2010 |
| 7756016 | Method and apparatus for efficient link redundancy A method that changes the selection of a 2:1 multiplexer that receives a first output signal from a first framer and a second output signal from a second framer. The first output signal is the same as the second output signal. An apparatus having a framer and a 2:1 ... | 07/13/2010 |
| 7724654 | Method for synchronized trunk failover and failback in a FC-AL switching environment The synchronization of trunk failover between two FC-AL switches when a primary trunk failure occurs is disclosed. If primary trunk T1 should fail, S1 bypasses the cascade port and sends a MaRK (MRK) ordered set out over duplicate trunk T2 to sw... | 05/25/2010 |
| 7719960 | Selecting alternate paths for network destinations Network traffic is sent via alternate paths in cases of network link or node failure. An alternate node responds to U-Turn traffic from a primary neighbor to select a further alternate. An algorithm for determining the alternate paths is provided to select loop-free... | 05/18/2010 |
| 7706256 | Protection switching method and apparatus for nodes in a resilient packet ring network The present invention discloses a protection switching apparatus for nodes in a Resilient Packet Ring (RPR) network, including: a first switching module, for receiving inner ringlet data and transmitting data to the outer ringlet; a second switching module, for rece... | 04/27/2010 |
| 7706257 | Protection method for ring network of optical transmission network A ring network protection method for an optical transmission network relates to digital information transmission, and includes using the overhead byte APS/PCC in the ODUk to transmit the protection information of the APS. The method adds fields in the APS/PCC and fu... | 04/27/2010 |
| 7688716 | Method, apparatus, and system for improving ethernet ring convergence time One embodiment in accordance with the invention is a method that includes detecting a failure in a ring network and transmitting a multicast message across the ring network that includes information regarding the failure. Additionally, a new ring master of the ring ... | 03/30/2010 |
| 7688717 | Transport network restoration method supporting extra traffic To restore a failed working path (WP) in a transport network, a restoration request is relayed between adjacent network elements (NE1, NE2) and the path set up hop by hop over spare resources by establishing local crossconnections (CC1, CC2 | 03/30/2010 |
| 7684316 | Multicast fast reroute for network topologies In one embodiment, a method includes receiving a multicast join message at a node having a plurality of interfaces, identifying the interface at which the join message was received, and selecting one or more of the interfaces to transmit the join message based on wh... | 03/23/2010 |
| 7680031 | Method and apparatus for load balancing and protecting data traffic in an optical ring A method and apparatus for load balancing and protecting data traffic in an optical ring is described. A method comprises configuring multiple spanning trees in a set of one or more network elements of an optical ring, load balancing with the multiple spanning trees... | 03/16/2010 |
| 7680032 | Bidirectional line switched partial rings, mesh networks, and methods of operation A bi-directional line switched mesh includes at least one bi-directional line switched ring (BLSR) sharing a common section with a partial bi-directional line switched ring (PBLSR). The partial bi-directional line switched ring has no working traffic along the commo... | 03/16/2010 |
