Hitachi, Ltd.

Hitachi Metals, Ltd.

Hitachi Microcomputer Engineering, Ltd.

Hitachi Microcomputer Eng. Ltd.

Osamu Takada

Junji Kinoshita

Masatoshi Takihiro

Toshihiko Murakami

Mika Mizutani

Mitsuhiro Yamaga

Tatsuya Yokoyama

Katsuyoshi Onishi

Koichi Kimura

Minoru Koizumi

Kazuhiro Maeda

Tetsuhiko Hirata

Takeshi Ishizaki

Toshiaki Hirata

Kenichi Yoshida

Fumio Noda

Yoshihiro Takiyasu

Tohru Setoyama

Kunio Hiyama

Koji Tsukada

Kazunori Nakamura

Emiko Yanagisawa

Yoshiki Watanabe

Eizou Hashi

Sayuri Kaneko

Atsushi Shimizu

Yasuhiro Takahashi

Yukio Ogawa

Masayuki Sakata

Toshihiko Ogura

Eiichi Amada

Naoya Ikeda

Masumi Kasahara

Kazuma Yumoto

Shigeru Miyake

Hiromichi Enomoto

Toshinori Hirashima

Tomoichi Ebata

Akihisa Nagami

Kenji Kawakita

Kenji Kataoka

Shizuo Kondo

Masahiko Nakahara

Hitoshi Yabusaki

Hidehiko Jusa

Naoya Kobayashi

Setsuo Ogura

Hidehiro Fukushima

Masato Terada

Hiroshi Wataya

Toshiaki Koyama

Junji Fukuzawa

Shingo Sugawara

Atsushi Kimoto

Takeshi Kondou

Hitoshi Kuwata

Kenji Kawaguchi

Takaya Ide

Kosuke Kaneko

Yasushi Shibata

Yusuke Nishi

Ken Akune

Yoshiyuki Kurosaki

Tomihisa Nishijima

Kazuo Matsunaga

Satoru Hirayama

Tatsuhito Iiyama

Masahito Sasaki

Ikuko Katsumaru

Hirashi Wataya

Akira Takigawa

Mikio Haijima

Yoshiki Akamatsu

Takashi Nisikado

Eizo Hashi

Jyunji Kinoshita

A management apparatus executes: receiving from a given communication apparatus where a fault has occurred, fault information; selecting a given flow that passes through the given communication apparatus from among a group of flows on the basis of the identification information of the given communication apparatus included in the fault information; determining whether the communication pattern of the given flow is similar to the given time series data indicating the change over time of the traffic within a period from a set period prior to the fault occurrence date and time to the fault occurrence date and time for the given flow; calculating the certainty that the given flow has been transmitted on the fault occurrence date and time on the basis of a frequency of appearance of the traffic of the communication pattern determined to be similar; and outputting calculation results.

Management apparatus, management method, and recording medium

The number of IP pools is increased independently of the number of network interfaces coupled to an external network. In response to a registration request requesting registration of an IP address pool, which is a part of an IP address space, in a first network, a control apparatus is configured to cause a processor to execute: generating a logical interface configured to operate as a logical network interface; logically coupling the logical interface to a logical switch; generating a NAT module logically coupled to a second network interface and configured to mutually convert an IP address in the IP address pool and an IP address in a second network; and logically coupling the NAT module to the logical interface.

Computer system, gateway apparatus control method and storage medium

A network system, having: a gateway apparatus set in a network; a physical computer coupled to the gateway apparatus; a virtualization unit that allocates computer resources of the physical computer to virtual machines; and a management computer that manages the physical computer, the virtualization unit, and the gateway apparatus, wherein the management computer includes: a network mapping unit that controls the gateway apparatus by configuring settings in a virtual network and another gateway apparatus and a VLAN coupled to the virtual network; and a virtualization management unit that controls the virtualization unit, wherein the virtualization unit includes: a virtual port coupled to the virtual machines; and a virtual switch that configures settings for the VLAN coupling the virtual port to the gateway apparatus, and wherein the gateway apparatus converts transmissions between a format of the VLAN and a format of the virtual network and performs transmission.

Network system, method of managing network system and gateway apparatus

A data center including: a data center infrastructure including at least one service network accessed by a terminal of a logical infrastructure user and a terminal of a resource user, at least one infrastructure network accessed by the terminal of the resource user, and at least one resource coupled to the service network and the infrastructure network; and a resource management apparatus for managing the infrastructure network, the service network, and the at least one resource, the resource management apparatus being configured to: generate, in response to a request, a logical service network, which is created by virtualizing the service network, a logical infrastructure network, which is created by virtualizing the infrastructure network, and a logical infrastructure in which the at least one resource is allocated to the logical service network and the logical infrastructure network; and provide the logical infrastructure to the terminal of the logical infrastructure user.

Data center resource allocation system and data center resource allocation method

A controller of a tag conversion apparatus configured holds tag conversion information associating addresses of communication apparatuses and information on tags of tagging schemes for network separation, analyzes a frame input from one of the plurality of ports and determine a current tagging scheme of the frame, determines a tagging scheme associated with a destination address of the frame based on the tag conversion information, and converts the frame to a frame of the tagging scheme associated with the destination address based on the tag conversion information when the tagging scheme associated with the destination address and the current tagging scheme are different.

Tag conversion apparatus

A communication path switching device is configured to determine whether or not a specified network device where exclusion from a communication path or addition to the communication path is specified through an input device can perform path switching based on the individual pieces of information on a coupling configuration and a presence or absence of an independent control function; refer to a storage device for the individual pieces of information on the coupling configuration and a coupling policy to change the coupling policy according to a result of the determination; and processing of issuing, according to the result of the determination and the individual pieces of information in the storage device, a path switching instruction to a network device having the independent control function and a network device not having the independent control function that are path switching targets on a communication path directed to the specified network device.

Communication path switching device, communication path switching method and communication path switching program

A network management apparatus is designed so that when reassigning the existing address, the network management apparatus extracts a link with the largest link cost from among links comprising the network based on the network configuration information and specifies a flow routed though the extracted link based on the statistic information; when receiving a path change request and a via link request to request a via link with respect to the specified flow from an external terminal, the network management apparatus selects either one of addresses of an address pair of the specified flow as a change target address; and when changing the selected change target address, the network management apparatus changes the change target address to a candidate address to be assigned by selecting an address, which is routed through a link included in the via link request and has not been assigned, as the candidate address to be assigned.

Network management apparatus, network management method, and network management system

In a service system including client apparatuses for issuing a service request and server apparatuses for receiving a service request and providing service, there is provided a data relaying apparatus for relaying data communication between them. In response to a service request, the data relaying apparatus establishes a connection from the client apparatus to the server apparatus (destination). The data relaying apparatus relays data communication between the client apparatus and the server apparatus by using the established connection. The data relaying apparatus manages a number of connections established to each of the server apparatuses. In response to a service request, the data relaying apparatus accepts or refuses the service request so as to make a number of connections to the server apparatus equal to or less than a predetermined number, and notifies a user refused relaying of a service request that relaying is possible.

Data relaying apparatus

In communication between communication terminals utilizing a network, a communication apparatus that receives and interprets service contents information described by a tag-type language or the like and performs processing in accordance with the interpretation thereof is disposed between the communication terminals. The communication apparatus can combine a plurality of processing operations in accordance with the described contents of the information to be implemented and can make various service designs. Further, the communication apparatus is characterized to acquire a program for updating a processing method definition connecting the service contents information and the processing operations by means of the Internet so that the processing method definition of the apparatuses distributed dispersedly can be modified promptly and the whole system can cope with modification of service contents promptly.

Apparatus and system for communication

Out of viewers of the same content, multi-user talking service is provided to only viewers who wish to enjoy the content in a large number of people. Only when an address of a terminalthat has transmitted a request for participation in multi-user talking is registered in a viewer management DB (which manages viewers of contents), a content distribution/multi-user talking service centerregisters the above-mentioned address into a participant management DB (which manages participants in multi-user talking) associating the address with identification information of a content that is registered in association with the address in question in the viewer management DB. Then, for each content, respective pieces of talking data received from addresses registered in association with identification information of said content in the participant management DB are synthesized to generate multi-user talking data, and generated multi-user talking data is transmitted to each of said addresses.

Multi-user talking system and multi-user talking method

The object of the present invention is to provide a communication network system that reduces the burden of entering settings for the network system. A service directory server in the communication network system provides unified management of the service information of the service-providing server installed in the network. The service information managed by the service directory server is distributed to the communication nodes either automatically or in response to requests from a communication node. The communication nodes receive packets and, for received packets that are addressed to itself, a service-providing server destination is determined based on the service information provided by the service directory server and the packet is transferred to the server to receive the service.

Communication network system and method for controlling services in a communication network system

There is provided an ATM controller which can support setting or alteration of protocol processing, and more greatly reduce the load (overhead) of software processing. The ATM controller performs the processing of an ATM layer and an AAL layer between a terminal and an ATM network, and comprises cell transmit control means for transferring a packet from a terminal side to an ATM network side while segmenting the packet into data cells, cell reception control means for reassembling data cells received from the ATM network side into a packet and transferring the packet to the terminal side, a rewritable memory for storing a firmware, and a microprocessor for performing a cell analysis and the processing corresponding to the analysis result.

ATM controller and ATM communication control device

A network system having a plurality of interconnected networks each having a policy server. The policy server sets a quality-guaranteed path in the network according to a policy held in the policy server. The policy server includes: a policy holding unit to hold a policy defining a quality that can be guaranteed in its own network, or local network, for an inter-network communication; a policy publicizing unit to make public the policy held in the policy holding unit to the policy servers of other networks; a guaranteed quality calculation unit to calculate, from a policy publicized by a policy server of a network on a path between the local network and other network, a quality that can be guaranteed for the path between the local network and the other network; and a quality-guaranteed path setting unit to provide a quality-guaranteed path, the quality-guaranteed path having a guaranteed quality within the quality calculated by the guaranteed quality calculation unit for the path between the local network and the other network.

Network system having plural networks for performing quality guarantee among the networks having different policies

Switches create and manage routes with route control protocols such as BGP-4, PNNI, etc. and a route management apparatus is notified of the information of the routes, created by these protocols, and the route management apparatus verifies the validity of a route of which the apparatus is notified by a switch based on the route information of the whole network composed of the plurality of pieces of information given by respective switches and the management policy set by a network manager. In the verification of validity, it is confirmed that the transmitted data are able to arrive at the destination securely and the set route is not against the management policy, and the route-usage-permission-notice of a route confirmed of its validity by the route management apparatus is transmitted to respective switches. Thereby, in the route control of a network using a route control protocol, it is made possible to prevent the occurrence of an abnormal route caused by the difference in the speed of operations of respective switches or an erroneous setting of a switch.

Network system having route verification function and the component apparatuses and method thereof

An asynchronous transfer mode (ATM) controller includes a buffer memory, a transfer circuit which transfers packet data between the buffer memory and an internal memory of an associative terminal unit with a data block of predetermined length being a unit therefor, a cell transmit circuit section that subdivides or &ldquo;slices&rdquo; the predetermined length data block sent from the terminal memory to the buffer memory into data cells which are then sent forth to the ATM network, a cell receive control circuit operable to reconstruct or re-assemble those data cells received from the ATM network over a transfer path thereby forming in the buffer memory a predetermined length data block, and a transfer control circuit operable to permit or &ldquo;instruct&rdquo; the transfer circuit to transfer the predetermined length data block between the buffer memory and the terminal memory and also instruct both the cell transmit control circuit and the cell receive control circuit to transfer the data cells between the buffer memory and the ATM network over the transfer path, thereby enabling accommodation of a variety of kinds of setup configurations and/or any possible changes or alterations in ATM protocol processing as assigned to a microprocessor.

Asynchronous transfer mode controller and ATM control method thereof and ATM communication control apparatus

Growing community of inventors

Tokyo, Japan

Osamu Takada