| Entries |
| Document | Title | Date |
|---|
| 20080219152 | METHOD AND APPARATUS FOR PROVIDING PACKET RING PROTECTION - For a ring protection method in a packet transport network a failure is detected at a first network node (N | 09-11-2008 |
| 20080304407 | Efficient Protection Mechanisms For Protecting Multicast Traffic in a Ring Topology Network Utilizing Label Switching Protocols - Efficient protection mechanisms for ring-based label-switching networks, such as multi-protocol label switching (MPLS) networks. The protection mechanisms are designed to protect point-to-multipoint label switching paths (LSPs). In steering ring protection embodiments, the nodes of the ring network are provided with pre-configured tables that enable each node to operate in both working mode and protection mode. The information required for each node to switch between the two modes in included in its respective table during the pre-configuration of the ring network. In wrapping ring protection embodiments, the wrapping is performed by assigning a unique LSP label to each LSP and further configuring each intermediate node in the ring network to transparently pass data packets including the unique LSP label. Upon detecting a failure in a network node, the data packets including the unique LSP label are switched to a protection ring. | 12-11-2008 |
| 20090003198 | 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 least one adjacent traffic demand and the number of pairs of terminal nodes pointed by traffic demands in the series of traffic demands is maximized. Each traffic demand of the demand chain is corresponded to a demand accommodating route which is defined as a route between the pair of terminal nodes on the ring network pointed by the each traffic demand and arranged in a predetermined rotation direction on the ring network. Then, signal paths required by traffic demands each pointing a pair of terminal nodes both included in the demand accommodating route chain are accommodated to the demand accommodating route chain. | 01-01-2009 |
| 20090016212 | Method and Apparatus for Managing a Loop Network - A method and apparatus for managing a loop network, the loop network ( | 01-15-2009 |
| 20090034412 | Packet Ring Network System, Packet Transfer System, Redundancy Node, and Packet Transfer Program - 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 ( | 02-05-2009 |
| 20090168643 | 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 ( | 07-02-2009 |
| 20090201803 | 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 whether the join message was received on a ring interface. If the join message was received on one of the ring interfaces, the join message is transmitted on another of the interfaces. If the join message was not received on one of the ring interfaces, the join message is transmitted on both of the ring interfaces. The method further includes receiving multicast data and transmitting the multicast data on the interface at which the join message was received. | 08-13-2009 |
| 20090268609 | 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 designated as a master device. The master device monitors the ring network to determine whether a fault has occurred in the ring network and transmits via a secondary port of the master device a network status message to the ASF device based on the determination of whether the fault has occurred. The ASF device determines a status of the ring network based on the network status message and selectively forwards data traffic to the master network device based on the determination of the status. As a result, the master device more efficiently utilizes network resources by not consuming processor or memory resources to prevent traffic loops. | 10-29-2009 |
| 20090268610 | ETHERNET RING SYSTEM, TRANSIT NODE OF ETHERNET RING SYSTEM AND INITIALIZATION METHOD THEREOF - The present invention provides an Ethernet ring system, transit node of Ethernet ring system, and initialization method thereof, wherein the method includes the following steps: step 1, generating a transit node of Ethernet ring protection domain by means of ring nodes; step 2, detecting the link state of two ring ports by means of the transit node: if neither of the two ring ports is detected as in-fault, then recording ring the link state as initialization state, blocking at least one of the ring ports, setting the at least one blocked port in prerelease state, and sending a ring state query packet to a master node, by means of the transit node; step 3, when the ring state query packet is received, sending a ring state packet recorded by the master node to the ring port that receives the ring state query packet, by means of the master node; and step 4, checking whether the ring state packet sent by the master node have been received by the transit node of which the ring state is the initialization state; if so, unblocking the blocked port in the prerelease state, to realize initialization of the transit node. | 10-29-2009 |
| 20090290486 | Ring Network Routing Method and Ring Network Node - The present invention discloses a method for routing in a ring network, the ring network comprising multiple connected nodes, wherein, the method includes: each node in the ring network acquiring topology information of the ring network, obtaining under-ring routings learnt by the other nodes from a under-ring network, calculating a main path and a backup path to each routing according to the acquired topology information of the ring network, creating an FRR switch table, and switching between the main path and the backup path according to the FRR switch table when a failure occurs in the ring network. Accordingly, the present invention also provides a node in the ring network. Adopting technical scheme provided by the present invention, a simple routing implementation for ring network and fast convergence when a failure occurs can be provided. | 11-26-2009 |
| 20090296569 | Ring network and method for automatic protection swicthing - A method for automatic protection switching in a ring network detects a link failure at a first interface of a node, generates a first link down message and sends the first link down message along the second direction of the ring network. Upon generation or receipt of the first link down message by the redundancy manager, the redundancy manager is unblocked such that non-control frames of the at least one automatic protection switching domain are no longer blocked by the redundancy manager. Upon generation or receipt of the first link down message by one of the nodes, the node having at least one entry assigning an address to the second interface IF | 12-03-2009 |
| 20100061229 | FAST RING REDUNDANCY OF A NETWORK - The invention relates to a method for operating a network as well as a network comprising at least one switch ( | 03-11-2010 |
| 20100188970 | NODE APPARATUS, RING NETWORK, AND PROTECTION PATH BANDWIDTH CONTROL METHOD - A node apparatus in a ring network in which a protection path is provided that cycles around the ring network and transports a signal in a direction opposite to a signal transporting direction of the working path and in the event of a failure of the working path, a node apparatus adjacent to the failure loops back the signal flowing on the working path onto the protection path, the node apparatus comprising: allowable bandwidth storing unit which stores a maximum total bandwidth value, which represents the largest value among per-link total values of bandwidths that a plurality of working paths use on respective links connecting between the node apparatuses, as an allowable bandwidth for a shared path; and bandwidth control unit which controls the bandwidth of traffic flowing on the protection path, in accordance with the allowable bandwidth. | 07-29-2010 |
| 20100246385 | INDUSTRIAL CONTROLLER EMPLOYING THE NETWORK RING TOPOLOGY - A network for an industrial control system employs a ring topology that is normally opened by a ring supervisor at the ring supervisor. Upon failure of the network, the ring supervisor reconnects the ring to provide an alternative transmission path around the failure point. High speed operation is reconciled with the ability to use commercial switching integrated circuits through a dual communication channel of communicating a network state as either closed or open using both high-speed hardware handled beacon frames and low-speed software processed announce frames. | 09-30-2010 |
| 20100254257 | METHOD FOR PROCESSING FAILURE OF SLAVE PORT OF MASTER NODE IN ETHERNET RING NETWORK SYSTEM - The present invention discloses a failure processing method for a slave port of a master node in an Ethernet ring system, comprising the following steps of: (1) the master node detecting a state of a link connecting directly the slave port; and (2) setting the slave port in a blocked state if the link connecting directly the slave port of the master node fails; and keeping the slave port in the blocked state during the failure of the link. | 10-07-2010 |
| 20100254258 | RING-BASED PACKET TRANSMITTING METHOD, NETWORK SYSTEM AND NODE EQUIPMENT - A ring-based packet transmitting method, network system and node equipment are provided. The ring-based packet transmitting method includes the following steps: a received user packet is encapsulated; one or more PBB or PBT rings are detected for fault; when a fault is detected, a PBB or PBT ring having no fault is selected to send the encapsulated packet to a target node equipment according to a corresponding relation between virtual media access control (VMAC) addresses and ports. The network system includes at least two node equipments interconnected with one or more node equipments respectively through ports provided thereon to form one or more PBB or PBT rings. The node equipment includes at least two ports and a data processing unit. Thus, packet transmission on the PBB or PBT ring is achieved. | 10-07-2010 |
| 20100271935 | PROTECTING AN ETHERNET NETWORK HAVING A RING ARCHITECTURE - Delivering multicast data traffic over a communication network includes a first network node delivering multicast data traffic to second network nodes. The first and second network nodes are connected by a transmission network in a ring architecture and implement a point-to-multipoint layer 2 protocol. A method includes at the first network node: collecting alarms signals indicative of a failure along the whole ring and of the second network nodes. Based on a current state of the alarm signals, delivering the multicast data traffic either in a first delivery direction along the ring, or in a second delivery direction along the ring opposite to the first delivery direction, or in both the first and second delivery directions. At each of the second network nodes: collecting alarm signals indicative of a failure of the transmission network locally to the second network node and of the second network node. Based on a current state of the local alarm signals either receiving the multicast data traffic delivered by the first network node from the first direction, forwarding the multicast data traffic in the first direction and transmitting local data traffic to the first network node along the second delivery direction, or receiving the data traffic delivered by the first network node from the second direction, forwarding the multicast data traffic in the second direction and transmitting the local data traffic to the first network node along the first delivery direction. | 10-28-2010 |
| 20100278040 | PROTECTION METHOD, SYSTEM, AND DEVICE IN PACKET TRANSPORT NETWORK - A protection method in a packet transport network is provided. A protection path is established for a service data flow borne on a shared protection ring in the method, where the protection path includes a wrapping protection path and a steering protection path. Firstly, a first service data flow is sent through the wrapping protection path. Then, a service data flow node stops sending a second service data flow subsequent to the first service data flow to the wrapping protection path, and buffers the second service data flow. When the first service data flow completely passes by the service data flow node again, the buffered second service data flow is switched from the wrapping protection path to the steering protection path. | 11-04-2010 |
| 20100309780 | Allocating Bandwidth in a Resilient Packet Ring Network by PI Controller - Implementations and techniques for allocating bandwidth in a resilient packet ring network by a PI-type controller are generally disclosed. | 12-09-2010 |
| 20100315946 | Failure protection for access ring topology - In one embodiment, a method includes configuring a first node, located at an edge of a core network and connected to an access ring, with a maintenance end point for a virtual local area network on a port connecting the first node to the access ring. The first node operates in an active mode for the virtual local area network and is in communication with a second node located at the edge of the core network and connected to the access ring. The method further includes receiving and processing at a processor at the first node, continuity check messages from access nodes on the access ring, synchronizing the first node with the second node, and communicating from the first node to the second node to initiate switching of the second node from a backup mode to the active mode for the virtual local area network upon identification of a failure. | 12-16-2010 |
| 20110069610 | HIGH CAPACITY RING COMMUNICATION NETWORK - A method for communication includes configuring a plurality of ring nodes to communicate over a communication network that includes two or more overlapping communication rings, each ring including two unidirectional ringlets in mutually-opposite directions. A data packet including one or more header fields is accepted at an ingress ring node. An egress ring node to which the data packet is to be forwarded by the ingress ring node is determined. A subset of the rings including one or more common rings that are connected to both the ingress and egress ring nodes is identified. A ringlet of a ring among the one or more common rings is selected responsively to a respective value of at least one of the header fields of the packet. The data packet is forwarded from the ingress ring node to the egress ring node over the selected ringlet. | 03-24-2011 |
| 20110170406 | METHOD AND SYSTEM FOR FINDING SHORTEST PATHS IN RING NETWORKS - An approach for determining shortest paths within a multiple ring network. Topology information associated with a ring network that includes a plurality of rings is retrieved, wherein each of the rings includes one or more nodes. A start node and an end node associated with the ring network are selected. A minimum set of one or more interconnected rings of the ring network is determined. One or more shortest paths between the start node and the end node are determined based on the determined minimum set. | 07-14-2011 |
| 20110222396 | COMMUNICATION APPARATUS, SYSTEM, AND METHOD - A communication apparatus used as a first communication apparatus in a communication system having a ring network, the communication apparatus including: a storage unit configured to store information indicating a correspondence between a state of a path provided on the ring network, a state of a first link established between the first and third communication apparatuses, a state of a second link established between the second and third communication apparatuses, and a direction of forwarding the data; and a control unit configured to monitor links that are included in the ring network, and presence or absence of a failure occurring in each of the first and second links, and determine a direction of forwarding data to which path identification information corresponding to the third communication apparatus is added based on a result of the monitoring and the information stored in the storage unit. | 09-15-2011 |
| 20110249551 | VIRTUAL SNOOPING BRIDGE IN COMPUTER NETWORKS - In general, techniques are described for implementing a virtual snooping bridge in computer networks. The techniques may be implemented by a ring network comprised of a plurality of ring network devices arranged in a ring topology. In one aspect, a ring network device coupled to an adjacent device that provides access to multicast content implements the techniques. This ring network device comprises one or more ports and a control unit. The ports receive ring messages from one or more of the other ring network devices in accordance with a group management ring protocol (GMRP). The ring messages indicate operations requested by one or more host devices with respect to delivery of content of the multicast group. The control unit then presents the received operations to the adjacent network device such that, from the perspective of the adjacent network device, the ring network appears as a single layer two network device. | 10-13-2011 |
| 20110267940 | 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 designated as a master device. The master device monitors the ring network to determine whether a fault has occurred in the ring network and transmits via a secondary port of the master device a network status message to the ASF device based on the determination of whether the fault has occurred. The ASF device determines a status of the ring network based on the network status message and selectively forwards data traffic to the master network device based on the determination of the status. As a result, the master device more efficiently utilizes network resources by not consuming processor or memory resources to prevent traffic loops. | 11-03-2011 |
| 20110292789 | METHOD, APPARATUS AND SYSTEM FOR RING PROTECTION - A method, apparatus and system for Ethernet Ring Protection (ERP) are disclosed. The method includes: detecting, by a node, a link fault on a ring; blocking, by the node, a port connected with the faulty link after detecting the link fault, and sending a fault alarm message to other nodes on the ring, wherein the fault alarm message contains a fault identifier; and judging, by a node which receives the fault alarm message, whether the fault identifier changes; if the fault identifier changes, the node which receives the fault alarm message storing the fault identifier contained in the fault alarm message and clearing a forwarding table of the node which receives the fault alarm message. | 12-01-2011 |
| 20120044803 | RING NETWORK PROTECTION METHOD, NETWORK NODE AND RING NETWORK - A ring network protection method, a network node and a ring network are provided. The ring network protection method includes: receiving, by a network node, a ring network protection switching request message sent by a node that detects a fault when the fault occurs in the ring network, where the ring network protection switching request message carries source and destination node information of the ring network protection switching request message; and determining a fault location according to the source and destination node information, selecting a protection tunnel according to the determined fault location, and switching services to the selected protection tunnel, where the selected protection tunnel is a link protection tunnel of a link between the network node and a source node, or a node protection tunnel of an intermediate node on a short way between the network node and the source node. | 02-23-2012 |
| 20120087236 | METHOD TO IMPLEMENT TWO FIBER SHARED PROTECTION RING WITH EXTRA TRAFFIC ON STM-1/OC-3 INTERFACE - A method for protection of data traffic transmitted over 2-fiber shared protection ring on STM-1/OC-3 interface is provided. Also, the method involves carrying extra traffic in a ring topology for STM-1/OC-3 interface. This is achieved by fixing the granularity to one of ‘VC12/VC11/VC3/VC12-VC3/VC11-VC3’ for the STM-1 interface and to one of ‘VT2/VT1.5/STS-1’ for the OC-3 interface upfront when the protection is configured on the network element. | 04-12-2012 |
| 20120099423 | Method and System for Refreshing the Single Ring Address in an Ethernet Ring - The present invention discloses a method for refreshing a single ring address of an Ethernet ring, which method comprises: achieving address refresh on an on-ring port at one side of a same node by the control of a refresh timer. The present invention further discloses a system for refreshing a single ring address of an Ethernet ring, which system comprises: an address refresh achieving unit configured to achieve address refresh on an on-ring port at one side of a same node by the control of a refresh timer. The method and system of the present invention reduces the number of refreshes of the address forwarding table and improves the efficiency and stability of Ethernet ring protection, thus greatly promoting the performance of the Ethernet ring. | 04-26-2012 |
| 20120201126 | 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 daisy chain topology with data frames sent in alternating directions through the bi-directional links. Such networks initially configured in a physical ring topology can tolerate single point failures by automatically switching to a logical daisy chain topology. | 08-09-2012 |
| 20120224471 | METHOD AND SYSTEM FOR RING PROTECTION SWITCHING - The present invention provides a protection switching method of a node having communication failure in a ring, in a communication network. In one embodiment, this is accomplished by checking for loss of signal (LOS) at the non-ERPS device or at least one of the node in a communication channel, checking periodically for Continuity Check Message (CCM) at both the node, wherein the CCMs are periodically transmitted from both the node through at least one non-ERPS device, appropriately setting a Remote Destination Indication (RDI) bit in the Continuity Check Message (CCM) generated from at least one node and transmits the same via the non-ERPS device or through the non-ERPS device or through a disjoint communication channel, and blocking port of the node towards the non-ERPS device upon receipt of the fault notification and transmitting signal fail notification message on both the ports in the ring. | 09-06-2012 |
| 20120243404 | SYSTEMS AND METHODS FOR COMMUNICATING VECTORING STREAMS IN MULTI-CARD VECTORING GROUPS - A communication system comprises a plurality of line cards having transceivers coupled to a plurality of subscriber lines. Each line card has at least one active transceiver within the same vectoring group, and each line card also has vector logic capable of cancelling crosstalk induced by an active transceiver that is a member of the vectoring group. Further, the line cards are coupled to one another via a ring connection across which vectoring information is passed from one line card to the next. In the event of a failure of one of the line cards, the failed card is bypassed by the vectoring stream so that the operational line cards can continue crosstalk vectoring operations despite such failure. | 09-27-2012 |
| 20120269056 | METHOD, DEVICE, AND SYSTEM FOR PROTECTING SEMI-RING NETWORK - The present invention discloses a method for protecting a semi-ring network. The method includes: running an Ethernet ring network protection protocol at a networking port of each non-closed ring node and a networking port of each closed ring node on a semi-ring network, and adding all networking ports into a virtual local area network that is corresponding to a protection instance; and establishing a pseudo wire PWE3 based or message mechanism based connection between non-closed ring nodes on the semi-ring network, where the connection is used to transfer an Ethernet ring network protection protocol packet of the protection instance. Based on the protection method, the embodiments of the present invention further provide a network device and a system for protecting a semi-ring network. | 10-25-2012 |
| 20120300618 | System and Method of Distributing Digital Content - A method includes sending a data packet, or a copy of the data packet, from a first video distribution hub to a second video distribution hub. The first video distribution hub is coupled to a first link and to a second link. The method also includes, in response to the second link being intact, sending the data packet, or the copy of the data packet, from the first video distribution hub to the second video distribution hub via a primary network path that includes the second link and excludes the first link. The method also includes, in response to a failure of the second link, sending the data packet, or the copy of the data packet, from the first video distribution hub to the second video distribution hub via a backup network path that includes the first link and that does not include the second link. | 11-29-2012 |
| 20120300619 | METHOD FOR SHARING PROTECTION OF MESH NETWORK PROTECTION FIELD AND SYSTEM THEREOF - A method and system for sharing protection of a mesh network protection domain are disclosed by the present invention. The method includes: presetting a protection ring in the mesh network protection domain, a path of the protection ring running through source and destination nodes of a plurality of services in the mesh network protection domain, and only reserving protection resources on the path of the protection ring; determining protection methods used respectively by a plurality of services said above and configuring a corresponding protection group; setting protection paths of all protection groups on the protection ring, and sharing the protection resources of the protection ring. | 11-29-2012 |
| 20120307625 | Method and Apparatus For Selecting Between Available Neighbors in a RAPID Alternate Path Calculation - A weighting process may be used to select between alternate neighbors in a RAPID calculation to enable policy and/or traffic engineering considerations to affect the selection of an alternate path through the network. The information used to weight the neighbors may static administratively assigned weighting information or dynamic weighting information such as local statistical traffic condition information. The process may take into account the amount of traffic being handled by the current primary next hop for the destination, the available capacity of the available alternate neighbors, the ability of the alternate neighbors to handle the additional traffic, and other considerations. Weighting may occur after a set of available loop free alternate neighbors has been determined. Alternatively, weighting may occur before the RAPID calculation has been performed to cause the neighbors to be ordered prior to RAPID processing. This may enable RAPID calculation to stop without considering all available neighbors. | 12-06-2012 |
| 20130028076 | Method and Device for Preventing Repeated Refreshing of Address Table of Ethernet Ring Network Node - A method and a device for preventing repeated refreshing of an address table of an Ethernet ring network node are provided. After a state of a port of the Ethernet ring network node is changed to a blocked state, it is determined that whether the Ethernet ring network node is an RPL neighbor node and whether the blockage is triggered by an RPL Blocked protocol frame. If so, the Ethernet ring network node stores refreshed record information corresponding to its two ports on the ring. The problem that an RPL neighbor node refreshes an address table repeatedly in the scenario of switchback of an Ethernet ring network can be effectively solved via the aforementioned method and device, thereby reducing flow broadcast during protection switching of the Ethernet ring network and improving the switching efficiency. | 01-31-2013 |
| 20130064068 | HIGH AVAILABILITY DISTRIBUTED FABRIC PROTOCOL (DFP) SWITCHING NETWORK ARCHITECTURE - In a switching network, each of a plurality of lower tier entities is coupled to each of multiple master switches at an upper tier by a respective one of multiple links. At each of the multiple master switches, a plurality of virtual ports each corresponding to a respective one of a plurality of remote physical interfaces (RPIs) at the lower tier are implemented on each of a plurality of ports. Each of the plurality of lower tier entities implements a respective egress port mapping indicating which of its plurality of RPIs transmits egress data traffic through each of its multiple links to the multiple master switches. In response to failure of one of the multiple links coupling a particular lower tier entity to a particular master switch, the particular lower tier entity updates its egress port mapping to redirect egress data traffic to another of the multiple master switches without packet dropping. | 03-14-2013 |
| 20130064069 | Recovery Method for Ring-Based Network - A recovery method for ring-based network comprises following steps: when an error occurs at first node, second and third nodes adjacent to the first node transmit a link-down packet respectively; after the first node is repaired, the first, second and third nodes transmit a link-up packet respectively, and each link-up packet includes a priority value of the first, second or third node; the priority values of the first, second and third nodes are compared with each link-up packet to enter the ring port of the first node, the second node or the third node into a forward status or a blocked status; and a forward link or a blocked link is formed among the ring ports of the first, second and third nodes. | 03-14-2013 |
| 20130077474 | METHOD FOR ETHERNET RING PROTECTION - An Ethernet Ring Protection (ERP) method is disclosed. The method includes: when a link on an Ethernet ring network is faulty, determining whether the faulty link is a link where a normally blocked port is located; and sending a first control message which carries first indication information to a ring node on the Ethernet ring network if the faulty link is the link where the normally blocked port is located, wherein the first indication information indicates that a forwarding table is not desired to be cleared by the ring node. Through the method according to the present invention, the broadcast traffic generated by unnecessary clearing of the forwarding table and self-learning is reduced effectively. | 03-28-2013 |
| 20130250753 | METHOD FOR PROTECTION SWITCHING IN ETHERNET RING NETWORK - A method for protection switching in an Ethernet ring network is provided. According to an aspect, the protection switching method includes: at a first node on the Ethernet ring network, detecting link failure; at the first node, determining whether a port through which a protection switching message has to be transmitted is on a forwarding path; and at the first node, generating a protection switching message based on the result of the determination; and at the first node, transmitting the protection switching message. | 09-26-2013 |
| 20130258840 | GENERALIZED SERVICE PROTECTION SYSTEMS AND METHODS - A node includes a first port configured to be selectively blocked and unblocked; a second port configured to be selectively blocked and unblocked; a forwarder between the first port and the second port; a management channel between the first port and the second port, wherein the selective blocking and unblocking of the first port and the second port is based on the management channel; and a data channel between the first port and the second port, wherein the data channel utilizes an arbitrary service identifier. A method can include operating a ring with Ring Protection Switching comprising a forwarding mechanism and a blocking mechanism that are independent and decoupled entities therebetween, wherein the ring includes a management channel and a data channel that each utilize an arbitrary service identifier. | 10-03-2013 |
| 20130286818 | ETHERNET RING PROTECTION SWITCHING METHOD, NETWORK DEVICE AND SYSTEM - Embodiments of the present disclosure provide an Ethernet ring protection switching method, network device and system. In the embodiments of the present disclosure, a node obtains bandwidth information of a first link on an Ethernet ring on which the node is located, and determines that bandwidth of the first link changes, where there is at least one Ethernet ring protection instance on the Ethernet ring, and then the node determines ports of the node, where the at least one Ethernet ring protection instance passes through the ports, so that the node can query pre-configured correspondence between bandwidth information and switching information of each link on the Ethernet ring, and execute, through the ports of the node, a switching operation corresponding to the bandwidth information of the first link. | 10-31-2013 |
| 20130343179 | ETHERNET CHAIN PROTECTION SWITCHING - The present invention relates to a protection switching method in a communication network, the communication network including plurality of communication devices forming a linear chain and at least one non-ERPS on the nodes ERPS (Ethernet Ring Protection Switching) device connecting terminal ports of the linear chain and thereby forming a ring. In one embodiment this is accomplished by instantiating ERPS on each communication device that forms a linear chain and on each non-terminal ports of the linear chain, identifying a node or link fault in the network, wherein the link or node fault is detected by Continuity Check Message (CCM), Loss of Light (LOL), Loss of Signal (LOS), Loss of periodic continuity check messages (IEEE 802.1 ag) or any other mechanisms thereof, blocking ports of the communication device in response to the detection of fault, periodically broadcasting a fault message by the blocked ports of the communication devices, wherein the message gets terminated at the ports of the communication device within the linear chain network without reaching the non-ERPS device, flushing the Media Access Control (MAC) table entry upon receipt of the fault message by all the communication device and unblocking of a root port link (RPL) of the linear for providing an alternate path to route network traffic after receipt of the fault message. | 12-26-2013 |
| 20140064060 | MAC FLUSH OPTIMIZATIONS FOR ETHERNET RINGS - Techniques are identified for optimizing the MAC flush in Ethernet rings for faster traffic restoration. In one embodiment, flushing of MAC addresses is performed only once on receiving a first control message. For example, when a first control message is received, a network device may switch from a first state to a second state, which may indicate that the MAC addresses are not to be flushed if additional control messages are received. In another embodiment, flushing of MAC addresses is performed on one ring port rather than on both ring ports. For example, a flag field of a control message header may be used to determine on which port to flush. In another embodiment, flushing of MAC addresses is performed on only one ring port of an interconnection node. For example, the ring port can be determined using a flag field and possibly labels associated with the ring ports. | 03-06-2014 |
| 20140112123 | OPTIMIZED SEAM ALLOCATION IN AN ETHERNET RING NETWORK - A method of managing a ring network. Bandwidth utilization metrics indicative of traffic flows within the network are derived. An optimal seam location is calculated based on the bandwidth utilization metrics. A channel block can be implemented at the calculated optimal seam location. The optimal seam location can be selected to balance traffic flows in the network, and can be updated as the distribution of traffic evolves over time. | 04-24-2014 |
| 20140133291 | CLOSED LOOP COMMUNICATION SYSTEM, APPARATUS AND METHOD - A system, apparatus and method for a closed loop system, which can be operated over a plurality of hardware platforms. Optionally, according to at least some embodiments of the present invention, the system, method and apparatus may be used for control of an energy system. | 05-15-2014 |
| 20140153383 | DISTRIBUTED ELECTRICAL LOAD MANAGEMENT METHOD AND SYSTEM FOR CONTROLLING COMMUNITY LOADS - A load management method for controlling a plurality of distributed community loads with a plurality of controllers. The controllers are connectable to a network and the distributed community loads are connectable to a power grid. The loads are controllable by a corresponding one of the controllers according to a local need and a power grid supply or a community need of the loads. A network node device adapted to communicate with other node devices of a same community within an overlay network topology system. The system has a plurality of node devices organized in a number of hierarchically linked rings. The plurality of node devices of a same ring is interconnected in groups of node devices. One of the node devices is a parent node for linking the node devices of a first ring to node devices of a second ring at another hierarchy by being a parent node to both first and second rings. | 06-05-2014 |
| 20140204731 | MULTIPROTOCOL LABEL SWITCHING RING PROTECTION SWITCHING METHOD AND NODE DEVICE - According to an example, a MPLS ring protection switching method is applied to each node in an MPLS TP ring. In the method, an MPLS forwarding table entry configured for a working LSP and an MPLS forwarding table entry configured for a backup LSP of the working LSP are added into a first table, an MPLS forwarding table entry formed by cross connecting the working LSP and the backup LSP is added into a second table, a packet is received, the first table is searched when the node is in a normal forwarding state, and the packet is forwarded by using an MPLS forwarding table entry in the first table, the second table is searched when the node device is in a protection forwarding state, and the packet is forwarded by using an MPLS forwarding table entry in the second table. | 07-24-2014 |
| 20140241148 | FAILURE RECOVERY METHOD IN NON REVERTIVE MODE OF ETHERNET RING NETWORK - Provided is a failure recovery method in a non-revertive mode of an Ethernet ring network. In an Ethernet ring network, link priorities between nodes or node priorities are determined based on media access control (MAC) addresses and the nodes having blocked ports are determined after failures are recovered from based on the priorities so that the blocked ports can be distributed. | 08-28-2014 |
| 20140313884 | DAISY-CHAINED RING OF REMOTE UNITS FOR A DISTRIBUTED ANTENNA SYSTEM - The present disclosure is a novel utility of a software defined radio (SDR) based Distributed Antenna System (DAS) that is field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. More specifically, the present invention relates to a DAS utilizing one or more Daisy-Chained Rings of Remote Units. The present invention enables a high degree of flexibility to manage, control, enhance, facilitate the usage and performance of a distributed wireless network such as Flexible Simulcast, automatic traffic load-balancing, network and radio resource optimization, network calibration, autonomous/assisted commissioning, carrier pooling, automatic frequency selection, frequency carrier placement, traffic monitoring, traffic tagging, pilot beacon, etc. As a result, a DAS in accordance with the present invention can increase the efficiency and traffic capacity of the operators' wireless network. | 10-23-2014 |
| 20150304192 | COMMUNICATION CONTROLLER - A communication controller is described. The communication controller can exchange data on first and second communications channels (A, B). In a first mode, data transmitted on the first communication channel cannot be decoded on the second communication channel. In a second mode, data transmitted on the first communication channel is decodable on the second communication channel so as to provide loop back functionality. | 10-22-2015 |
| 20150365253 | NETWORK SYSTEM - In a configuration where an apparatus network is connected to a backbone network at two points, a first apparatus and a first switch device are normally communicatively connected to each other and also communication between a second apparatus and a second switch device is normally disconnected. The first apparatus monitors the link state with the first switch device. The second apparatus queries the first apparatus about the link state. When the first apparatus and the first switch device are not communicatively connected to each other or when the second apparatus cannot communicate with the first apparatus via the apparatus network, the second apparatus cancels the disconnected state with the second switch device. | 12-17-2015 |
| 20150381408 | AUTO-DISCOVERY AND CONVERGENT MULTI-PROTOCOL LABEL SWITCHING RINGS - Techniques are described for specifying and constructing multi-protocol label switching (MPLS) rings. Routers may signal membership within MPLS rings and automatically establish ring-based label switch paths (LSPs) as components of the MPLS rings for packet transport within ring networks. In one example, a router includes a processor configured to establish an MPLS ring having a plurality of ring LSPs. Each of the ring LSPs is configured to transport MPLS packets around the ring network to a different one of the routers operating as an egress router for the respective ring LSP. Moreover, each of the ring LSPs comprises a bidirectional, multipoint-to-point (MP2P) LSP for which any of the routers can operate as an ingress to source packet traffic into the ring LSP for transport to the respective egress router for the ring LSP. Separate protection paths, bypass LSPs, detours or loop-free alternatives need not be signaled. | 12-31-2015 |
| 20150381420 | PATH PROTECTION FOR RING-BASED MULTI-PROTOCOL LABEL SWITCHED PATHS - Techniques are described for specifying and constructing multi-protocol label switching (MPLS) rings. Routers may signal membership within MPLS rings and automatically establish ring-based label switch paths (LSPs) as components of the MPLS rings for packet transport within ring networks. In one example, a router includes a processor configured to establish an MPLS ring having a plurality of ring LSPs. Each of the ring LSPs is configured to transport MPLS packets around the ring network to a different one of the routers operating as an egress router for the respective ring LSP. Moreover, each of the ring LSPs comprises a bidirectional, multipoint-to-point (MP2P) LSP for which any of the routers can operate as an ingress to source packet traffic into the ring LSP for transport to the respective egress router for the ring LSP. Separate protection paths, bypass LSPs, detours or loop-free alternatives need not be signaled. | 12-31-2015 |
| 20160050103 | Relay System and Relay Device - Each of first and second monitoring points monitors the continuity between itself and outside of the device by use of a CCM frame. First and second internal monitoring points monitor the continuity between the first monitoring point and the second monitoring point inside the device by an internal continuity monitoring frame. When a first internal monitoring point or a second internal monitoring point does not receive the internal continuity monitoring frame within a predetermined period, a ring control unit instructs the first and second monitoring points to transmit a RDI frame or instructs them to stop transmission of a CCM frame. | 02-18-2016 |
| 20160191271 | Control System for a Rail Vehicle - A control system for a rail vehicle with a plurality of cars has at least one central control device for controlling vehicle-wide functions based on global information, and a set of decentralized car control devices, each containing a local sub-information of the global information during operation. The control system has a redundancy which is sufficient relative to availability requirements and which is achieved cost-effectively and with minimal effort. A data connection apparatus having connection segments, which connect car control devices of adjacent cars in pairs to produce data transfer in at least one transfer direction. The paired car control devices and the connection segments form, in the transfer direction, a data chain that is cumulative in respect of the sub-information and there is at least one identifying unit which detects and evaluates data of the data chain to form the global information. | 06-30-2016 |
| 20160191302 | Relay System and Switching Device - When transmitting an R-APS (NR) frame, a control frame processing unit sets a priority setting value arbitrarily set by a user as a value of a node ID region. A ring control unit compares priority based on a value of the node ID region of the R-APS (NR) frame transmitted from its own device and a value of the node ID region of the R-APS (NR) frame transmitted from a different device, and the ring control unit determines whether a ring port is maintained in a block state or changed from the block state to an open state based on a result of the comparison. | 06-30-2016 |
| 20160204957 | ENHANCED LOOP-BREAKING PROTOCOL TO SUPPORT CONNECTIONLESS AND CONNECTION-ORIENTED ETHERNET | 07-14-2016 |
