Nec Corporation

Youichi Hidaka

Junichi Higuchi

Jun Suzuki

Takashi Yoshikawa

Atsushi Iwata

Nobuyuki Enomoto

Masaki Umayabashi

Masanori Takashima

Makoto Shibutani

Tetsu Izawa

Hideyuki Shimonishi

Daisaku Ogasahara

Masahiko Takahashi

Kazuo Takagi

Shigeyuki Yanagimachi

Hideo Yoshimi

Masashi Hayashi

Keisuke Torigoe

Teruyuki Baba

Shihomi Sato

Minaxay Philavong

Masato Yasuda

Yukihiro Hara

Nobuharu Kami

Takashi Yokota

Akira Arutaki

Tsugio Okamoto

Mikiharu Yamashita

Koichi Tsuchiya

A network apparatusis provided with a physical layer processing unitconfigured to generate physical layer information related to a physical layer of data in accordance with processing to transmit/receive the data, and a transmission unitconfigured to transmit the data to a destination and to also the transmit physical layer information to a recipient separate from the destination.

Network apparatus, management apparatus, sensing system, data transfer method, management method, sensing method, and computer-readable recording medium

A communication device includes a forwarding processing unit configured to sort a telegram on the basis of processing content identification information included in header information of the telegram and a telegram processing unit configured to perform processing based on the processing content identification information on a payload of the telegram when the processing content identification information indicates processing in the communication device. The telegram processing unit can directly extract the payload of the telegram without performing protocol processing on the telegram and perform processing using the payload.

Communication device, terminal device, central server device, information processing system, telegram processing method and telegram generation method

This invention expands the scope of application of a pass-through technology in which a guest OS directly controls a remote device that is connected via a network. This data-processing apparatus is provided with a host OS that provides a virtual hardware environment to a guest OS that performs I/O processing with respect to a device implemented in a remote apparatus connected via a network. The host OS has a bus extension unit that traps I/O instructions issued by the guest OS, encapsulates the trapped I/O instructions, and delivers the encapsulated I/O instructions to the remote apparatus as network packets.

Computer system, data-processing apparatus, bus-data transferring method, and computer-readable recording medium for transferring data flowing through system bus

A network system of the present invention includes a computer and a device connected via a network, and a system management device. The computer and the device include, respectively, bridges that encapsulate transmission/reception data transmitted and received to and from each other and transmit and receive the data to and from each other via the network. Each of the bridges includes a control data transmitting means for generating control data for controlling the state of the system based on control auxiliary data issued from the computer or the device and used for controlling the state of the system, and transmitting the control data to the system management device via the network. The system management device includes a system controlling means for controlling the state of the system in accordance with the control data received thereby.

Network system

An I/O device sharing system characterized by comprising: an I/O device () shared by a plurality of hosts (-to-N); a system manager () which sets the I/O device (); a virtual bridge () which virtualizes the I/O device (); and a network () which connects the I/O device (), the system manager (), the plurality of hosts (-to-N) and the virtual bridge () to each other, wherein the virtual bridge () includes a connection virtualization unit () by which it is detected that an address setting of a plurality of virtual functions provided in the I/O device () that is set by the system manager () is performed, the virtual function is enabled, or both of them are performed and each host is permitted to access each virtual function.

I/O device sharing system and I/O device sharing method

A server includes a plurality of network interfaces capable of communicating between the server and a plurality of communication apparatus which includes network ports capable of connecting a communication cable; a first unit specifying a pair of the network ports, which are connected via the communication cable, according to information related to connectivity of the network ports; and a second unit sending an instruction to the communication apparatus; wherein the instruction is to connect a first end of the communication cable to a first port corresponds to the specified port, and to connect a second end of the communication cable to a second port corresponds to the specified port.

Communication system, communication method, server equipment, and communication equipment

In the case of a system where a communication device is remote-controlled from a control server, depending on timing when an entry is written into a forwarding table of the communication device from the control server, there is a possibility that a loop and discard of the traffic occur. Therefore, for registration, rewriting and deletion of the entry of the forwarding table which are performed on the communication deviceby the control server; the communication deviceverifies contents of control instructions from the control server; the communication deviceholds the result of this verification; the control serveracquires the result of the verification; the control serverjudges whether or not a series of controls can be executed based on the results of the verification from the plurality of communication devices; and then the control serverinvokes the execution at the plurality of communication devices

Communication control system and communication control method

In a switch node connected with an external control server, a high functional service protocol processing can be realized by utilizing a multi-route compatible switch and a network interface (NW I/F), which are prescribed by the PCI express. Specifically, in a system which is provided with a switch node and a control server, a plurality of CPUs having a great deal of memories and a plurality of extended NW I/Fs are connected by a multi-route compatible PCI express switch, to configure a switch port of the plurality of extended NW I/Fs. Load distribution transfer processing to the plurality of CPUs from the network interfaces is made possible. High-speed packet processing is realized through the multiple processing by using the plurality of CPUs. A high-speed switch node is provided in which a large-capacity flow table is configured with the software-based switch node by using a large-capacity memory space of the CPU.

Communication control system, switch node and communication control method

A host monitoring unit in a host connection device () detects a change in a connection status between a host device () and the host connection device () based on a change in power status of the host device (), and notifies a host connection controller. The host connection controller notifies an I/O connection controller in an I/O connection device () connected with an I/O device () having a power linking permitted of the change in the connection status, and sets or cancels an interconnection. After the completion of the setting or cancellation of the interconnection, the I/O connection controller notifies an I/O power supply controller of the change in the connection status, and the I/O power supply controller controls an I/O power supply ().

Computer system, connection device, power supply control method, and power supply control program recording medium

A CPUcontrols data transfer from a first device to a second device in a kernel mode. A main memorystores data to be transferred from the first device to the second device. The CPUhas: a first device control meanswhich controls the first device; a second device control means which controls the second device; and a data transfer control meanswhich makes a read instruction which instructs the first device control meansto store data read from the first device in the main memory, and makes a write instruction which instructs the second device control meansto write the data stored in the main memoryin the second device.

Data control system, data control method, and data control program

A communication equipment notifies a server equipment of a communication port to which a communication cable is connected. If another communication port as a connection partner of the notified communication port is not yet connected to the communication cable, the server equipment transmits a first notification instruction to another communication equipment having the said another communication port. The said another communication equipment indicates, in a viewable manner, a communication port corresponding to the first notification instruction as a communication port to which the communication cable is required to be connected.

Any packet loss is detected very quickly by means of only a series of sequence number in a multi-path environment where a transmitter and a receiver are connected to each other by way of a plurality of networks when no inversion of sequence arises in any of the networks. A communication apparatus includes a plurality of sequence buffers arranged at each network to accumulate packets until a sequence acknowledgement and an absence detecting section adapted to determine the occurrence of an absence of a packet when one or more packets are accumulated in all the sequence buffers. With this arrangement, the absence detecting section of the receiver monitors the packets staying in the sequence guaranteeing buffer arranged in each of the network, paying attention to the characteristic that packets are stored in the sequence buffers of all the networks when a packet loss takes place.

Communication apparatus, communication system, absent packet detecting method and absent packet detecting program

In a network system in which a switch forwarding packets and a control server determining route information are separated, it is desired to achieve a redundancy of the control channel by an out-of-band control channel and an in-band control channel, when the switch receives a control message regarding the flow entry registration and the like based on the route information from the control server. Specifically, the separated switch and control server are connected by a control channel for sending and receiving the control message. The switch is not only connected to a control server via an out-of-band control channel by a route dedicated to the control message, but also connected to another control server via an in-band control channel by a route which is common with a normal data communication for determining the route information, to achieve a redundancy of the control channel.

Network system and network redundancy method

A communication system has: a monitoring unitmonitoring power consumption in a switching unitforwarding a communication message; a power consumption data transmission unittransmitting a data indicating the power consumption monitored by the monitoring unit; a control signal receiving unitreceiving a control signal; a control unitcontrolling a data transfer rate on the basis of content of control included in the control signal received by the control signal receiving unit; a power consumption data receiving unitreceiving the data indicating the power consumption transmitted by the power consumption data transmission unit; a control determination unitdetermining, on the basis of the data received by the power consumption data receiving unit, target of control and the content of control regarding power consumption; and a control signal transmission unittransmitting the control signal including the target of control and the content of control determined by the control determination unit

Communication system, network management method and switching device

A VPN connection method and a communication system are provided, each which can omit the setting of a firewall and the installation of a relay server and can establish communications from the outside of a firewall to the inside thereof. The internal networkis connected to the external networkvia the firewall. The internal networkenables communications by an e-mail from the external network(outside the firewall) to the mail serverin the internal network(inside the firewall) or communications by telephone or radio, which is not via the firewall. The feature of the firewallis utilized that access from the outside to the inside of the firewall through VPN connection is very difficult but the access in the reverse stream can be simply performed. Using the mail server, telephone line or radio line, the internal networkreceives an e-mail, which requires for VPN connection from the external network, or control information through the telephone line. Thus, the internal networksends callback for VPN connection to the e-mail transmission source. As a result, the callback allows the external networkto pass through the firewall

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Tokyo, Japan

Youichi Hidaka