Patent application number | Description | Published |
20080219168 | RELAY APPARATUS, PATH SELECTION SYSTEM, PATH SELECTION METHOD AND PROGRAM - An object of the present invention is to reflect a band of the bottleneck into the cost, to select an optimal path, and to enhance an efficiency of the net utilization without making a setting or a modification to the apparatus (bridge etc.) in which the path control protocol operates in a case where a difference exists between an actually utilizable rate (a band of the bottleneck) in the path between the bridges etc. and a link rate of the connection link such as the bridge etc. in a net in which the apparatus (bridge etc.), in which the path control protocol (STP etc.) for automatically computing a cost of a link by a physical band of the connection link operates, exists. In the system of the present invention, the port manager within the relay apparatus, upon receipt of a notification of the link rate from the port, investigates which side, out of the WAN side and the LAN side, becomes a bottleneck, and the cost rewriter within the relay apparatus rewrites the root path cost field within the BPDU in conformity to the rate of the bottleneck. | 09-11-2008 |
20090022168 | PACKET RING NETWORK SYSTEM, METHOD OF CONNECTING PACKET RINGS, AND INTER-RING CONNECTING NODE - [Problems] To enable each of a plurality of links connecting rings to perform packet transfer while preventing multiple reception of packets and broadcast stream in a normal state where no failure has occurred. | 01-22-2009 |
20090052317 | 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 | 02-26-2009 |
20090122800 | FRAME TRANSFER ROUTE CONFIRMATION METHOD, NODE, FRAME TRANSFER ROUTE CONFIRMATION PROGRAM AND FRAME TRANSFER ROUTE CONFIRMATION SYSTEM - The frame switching unit | 05-14-2009 |
20090257458 | CLOCK SYNCHRONIZATION SYSTEM - A clock synchronization system includes a master node; a PSN (Packet Switched Network); and a slave node configured to synchronize a recovery clock signal in the slave node with a clock signal in the master node by using packets periodically received from the master node through the PSN. The slave node includes: a buffer section having a buffer and configured to temporarily store the packets received from the master node in the buffer, to monitor and output a buffer accumulation amount, and to output data of the packets from the buffer in response to the recovery clock signal; a maximum extracting section configured to receive the buffer accumulation amount from the buffer and to extract a maximum value for each time period from the buffer accumulation amount; a control section configured to generate a control voltage such that the maximum values from the maximum extracting section are held at a reference value; and a VCO (Voltage Controlled Oscillator) configured to adjust a frequency of the recovery clock signal based on the control voltage from the control section. | 10-15-2009 |
20090268891 | TELEPHONE SYSTEM, POSITIONAL INFORMATION SERVER, TELEPHONE EXCHANGE, AND METHOD OF CONTROLLING TELEPHONE SYSTEM - A system includes a storage for storing positional information of telephone terminals, a determiner for being notified of a called telephone terminal by an exchange which received a call from a calling telephone terminal, and determining whether the called telephone terminal is in a particular area, and an indicator for, if the called telephone terminal is in the area, retrieving a telephone terminal in a range based on the called telephone terminal, as a neighboring terminal, and indicating the neighboring terminal to the exchange. The exchange includes a requester for sending a connection request to another exchange, to request that a connection be made between the called telephone terminal and the neighboring terminal, and a caller for receiving a connection request from another exchange and sending a call to a telephone terminal which is assigned by the connection request. | 10-29-2009 |
20090305708 | MOBILE TERMINAL, STORE-AND-FORWARD MULTIHOP COMMUNICATION METHOD AND PROGRAM - A mobile terminal includes a mobile phone function unit, a storing unit, a communication control unit, and a store-and-forward multihop communication function unit. The mobile phone function unit confirms status of connection with a mobile base station and exchanges information with the mobile base station when the status of connection is a connection state. The storing unit stores information received and generated by the mobile phone function unit. The communication control unit receives connection information including the status of connection from the mobile phone function unit and generates a control signal when the connection information indicates a disconnection state. The store-and-forward multihop communication function unit builds a first session with a first mobile terminal after starting in response to the control signal, stores information received from the first mobile terminal and generated information in the storing unit, transmits information stored in the storing unit after building a second session with a second mobile terminal, and stores information received from the second mobile terminal in the storing unit. | 12-10-2009 |
20100154049 | TERMINAL, SECURITY SETTING METHOD, AND PROGRAM THEREOF - [Problems to be solved] To provide a system capable of controlling a PC firewall responding to a location, thereby to prevent a third person from intruding into a PC without being restricted by an application. | 06-17-2010 |
20100220612 | QUALITY MEASURING SYSTEM, QUALITY MEASURING APPARATUS, QUALITY MEASURING METHOD, AND PROGRAM - An exemplary object of the present invention lies in a point of providing a technology capable of measuring a transmission quality of an Ethernet network in order to utilize Ethernet as carrier-grade communication. The present invention includes an error bit number measurer for measuring the number of error bits that have occurred for a frame of Ethernet, being a target of monitoring, within a monitoring period, a transmitted bit number measurer for measuring the number of total transmitted bits of Ethernet frames that a device facing it has transmitted within the foregoing monitoring period, and a bit error rate operator for obtaining a bit error rate of a transmission path by employing a measurement result by the foregoing error bit number measurer and the foregoing transmitted bit number measurer. | 09-02-2010 |
20100232322 | NODE, NETWORK SYSTEM, FRAME TRANSFER METHOD, AND FRAME TRANSFER PROGRAM - For eliminating a reduction in throughput in a network as a whole according to optimum path transfer technique which is the expansion of spanning tree protocol, a frame switching unit of the network has an STP control unit for, when a port state of a spanning tree is changed, notifying a table control unit of an identifier of the spanning tree and a port number of a predetermined port among the respective ports, the table control unit for setting, in a forwarding table storage unit, a received port number of a predetermined port as an output port in an entry in which a node ID is equivalent to a spanning tree identifier, and a table search unit for determining an output destination from among output ports obtained by acquisition of received frame information from a frame analysis unit. | 09-16-2010 |
20100309934 | CLOCK SYNCHRONIZATION SYSTEM, ITS METHOD AND PROGRAM - The clock synchronization accuracy between a master node and a slave node is stably measured. The slave node synchronizes its own clock with the clock of the master node by means of the packets transmitted from the master node. It reproduces the clock of the slave node by means of the transmitted packets, accumulates information on the transmitted packets and the clock of the slave node and performs clock synchronization on the basis of the accumulated information. | 12-09-2010 |
20110006818 | CLOCK SYNCHRONIZATION SYSTEM, NODE, CLOCK SYNCHRONIZATION METHOD, AND PROGRAM - The invention provides a clock synchronization system which synchronizes the clock of a slave node with the clock of a master node by use of a timestamp packet transmitted from the master node to the slave node on the packet network, wherein the slave node includes a phase comparison part | 01-13-2011 |
20110228834 | PACKET-FILTER-USED CLOCK SYNCHRONIZATION SYSTEM, APPARATUS, METHOD AND PROGRAM THEREOF - A clock synchronization system synchronizes a clock of a slave node with a clock of a master node. The master node includes a packet transmitting unit that transmits a packet including a time stamp (TS) to the slave node. The slave node includes: a packet receiving unit that receives the packet transmitted from the master node; a packet filter unit that calculates as a value of delay of the packet a difference between a TS on the clock of the slave node when the packet is received and the TS of the packet received, corrects the value of the delay of the packet or a threthold for the delay of the packet, and performs filter processing on the packet received from the packet receiving unit based on the value of the delay of the packet and the threshold for the delay of the packet; and a phase synchronization unit that outputs the clock of the slave node based on the TS included in the packet employed. | 09-22-2011 |
20120020232 | COMMUNICATION APPARATUS, COMMUNICATION SYSTEM AND COMMUNICATION METHOD - A communication apparatus including: a counter storage unit storing a reception counter value of the apparatus when a specific frame is received; a measurement unit measuring the number of frame losses occurring between the apparatus and the preceding apparatus on the basis of the reception counter value of the apparatus, a transmission counter value of a source apparatus of the specific frame included in the specific frame and the total number of frame losses between the source apparatus and the preceding apparatus of the apparatus, when the specific frame is received; a transmission unit transmitting the specific frame; and a frame control unit adding, to the specific frame, loss information associating the number of frame losses occurring between the apparatus and the preceding apparatus with an identifier of the apparatus and forwarding the specific frame to the transmission unit, when the frame loss occurs, and forwarding the specific frame to the transmission unit without adding the loss information to the specific frame, when no frame loss occurs. | 01-26-2012 |
20120113820 | CONGESTION DETECTING METHOD AND COMMUNICATION NODE - An inspection signal to inspect forward-path or return-path communication, is transmitted from a reference node of a network. A response signal is transmitted in a priority class from a node of a forward path to the reference node. In the case of inspection of return-path communication, a replica of the response signal is transmitted in a non-priority class from the node of the forward path to the return path, and the node that receives the replica of the response signal transfers the replica in a priority class to the reference node. In the case of inspection of forward-path communication, a replica of the inspection signal is transmitted in a non-priority class from the node of the forward path to the forward path, and a replica of the response signal is transmitted in a priority class from the node that receives a replica of the inspection signal to the reference node. | 05-10-2012 |
20120189011 | A COMMUNICATION APPARATUS, A COMMUNICATION SYSTEM AND A COMMUNICATION METHOD - A communication apparatus comprises: a memory unit which correlates a label assigned to a packet and an address of a source of the packet, and memorizes them as an entry; a receiving unit which receives a packet from a network; a learning unit which judges whether or not there exists an entry corresponding to the received packet in the memory unit, and in case there exists no entry corresponding to the received packet in the memory unit, stores a label assigned to the received packet and an address of a source of the received packet in the memory unit; and a processing unit which, in case there exists an entry corresponding to the received packet in the memory unit, assigns an address corresponding to the received packet to the received packet. | 07-26-2012 |
20120219003 | NODE, A MONITORING MANAGEMENT METHOD USED FOR IT, AND A TRANSFER SYSTEM, AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT USING IT - [Issues] To provide a node (transfer device) which can process an OAM frame within an output line card. | 08-30-2012 |
20130170390 | DELAY MEASUREMENT SYSTEM AND DELAY MEASUREMENT METHOD, AS WELL AS DELAY MEASUREMENT DEVICE AND DELAY MEASUREMENT PROGRAM - The present invention measures 1-way delay without equipping all nodes with special functionality in a situation in which time has not been synchronized. The delay measurement system of the present invention has a transmission origin node and a transmission destination node which is connected to the transmission origin node through a network including relay nodes, and measures the delay time from the transmission origin node to the transmission destination node direction, wherein the transmission origin node generates a clock. On the basis of the generated clock, delay measurement packets are generated at regular periods. The generated delay measurement packets are transmitted to the transmission destination node. The transmission destination node selects the delay measurement packets from among the received frames. The delay received by the delay measurement packets in the network between the transmission origin node to the node itself is measured. | 07-04-2013 |
20140219285 | NETWORK SYSTEM - A network system includes a signaling network configured to perform signaling information exchange with client nodes, determine a data information transfer route, and generate setting information, and a data network configured to construct the data information transfer route according to the setting information from the signaling network and perform data exchange between the client nodes. | 08-07-2014 |
20150043330 | END-TO-END HITLESS PROTECTION IN PACKET SWITCHED NETWORKS - A method and system are described for providing hitless protection in a packet switched network having source nodes and destination nodes. The method includes enabling a working path and a protecting path between the source and destination nodes. The working path is non-overlapping with respect to the protecting path. The method further includes replicating traffic in a given one of the source nodes to generate replicated traffic. The method also includes forwarding the traffic and the replicated traffic through a working path and a protecting path, respectively, from the given one of the source nodes to a particular one of the destination nodes. The method additionally includes delivering a hitless-protected service in the particular one of the destination nodes by selecting traffic packets received from either the working path or the protecting path. | 02-12-2015 |
20150043331 | ADDING LINK AGGREGATION GROUP TO HITLESS PROTECTION IN PACKET SWITCHED NETWORKS - A method is provided for traffic aggregation in a hitless protected packet switched network having source and destination nodes. The method includes enabling a working path and a protecting path between the source and destination nodes. The working path is non-overlapping with respect to the protecting path. The method includes generating, using a processor, internal marker packets at working and protecting input ports of the source nodes. Each market packet represents a respective marker time period. The method includes transmitting the marker packets to working and protecting output ports of the source nodes, by the working and protecting input ports of the source nodes. The method includes selectively aggregating, at each of the working and protecting output ports of the source nodes, hitless traffic sent from different working and protecting inputs ports of the source nodes to provide an aggregated flow there from, responsive to the marker packets. | 02-12-2015 |
20150085647 | Eliminating External Buffer for Hitless Protection by Using Channelized Flow Control - A packet switched communication system to support hitless protection includes a packet processor; a traffic manager with a buffer sized to compensate a maximum skew of each hitless path pair of a working path and a protecting path; and a hitless processor positioned between the packet processor and the traffic manager, wherein an interface between hitless processor and traffic manager has flow control to start or stop (XON/XOFF) traffic. | 03-26-2015 |