Patents by Inventor Shinichi Akahane

Shinichi Akahane has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20090190600
    Abstract: The first relaying device uses the first port (the second relaying device) for the first priority in the first selecting mode, and uses a port other than the second port (the third relaying device) for the second priority. The first relaying device uses the first port for the first priority and uses the second port for the second priority, in the second selecting mode. In a case where the selecting mode is the first selecting mode, the power mode of the third relaying device is the first power mode wherein the power consumption is relatively small. In a case where the selecting mode is the second selecting mode, the power mode of the third relaying device is the second power mode wherein the power consumption is relatively high.
    Type: Application
    Filed: November 26, 2008
    Publication date: July 30, 2009
    Inventor: Shinichi AKAHANE
  • Publication number: 20090180477
    Abstract: In the first power mode: each packet processor of the second group maintains own operating mode in a first operating mode of relatively low power consumption; and the distributor selects the handling packet processor from the first group for the first priority, and selects the handling packet processor from at least one group excluding the second group for the second priority. In the second power mode: each packet processor of the second group maintains the own operating mode in a second operating mode of relatively high power consumption; and the distributor selects the handling packet processor from the first group for the first priority, and selects the handling packet processor from at least one group including the second group for the second priority.
    Type: Application
    Filed: November 26, 2008
    Publication date: July 16, 2009
    Inventor: Shinichi Akahane
  • Publication number: 20090141641
    Abstract: The communication device has a frame transfer unit that executes frame transfer via the first communication link and the second communication link, a link confirmation frame sending unit, and a return link confirmation frame monitoring unit. The link confirmation frame sending unit causes the frame transfer processing unit to send a link confirmation frame for use in confirming a normal link status via the first communication link from the communication device to the counterpart communication device. The return link confirmation frame monitoring unit performs fault detection of the first and second communication links by monitoring a return link confirmation frame which is to be returned from the counterpart communication device to the communication device via the second communication link when the counterpart communication device receives the link confirmation frame via the first communication link.
    Type: Application
    Filed: July 23, 2008
    Publication date: June 4, 2009
    Inventors: Shinichi Akahane, Teruo Kaganoi, Tomohiko Kohno, Kazuo Sugai
  • Patent number: 7529251
    Abstract: A high quality network is provided that eliminates the sorting time for sorting through registering look-up conditions, such as source and destination MAC addresses, in a content addressable memory, by generating a routing or flow control look-up key, and then selectively activating some of the physical banks in the content addressable memory with the look-up key during look-up for the look-up conditions. The look-up key is generated by extracting a part or all of the data contained in a packet header.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: May 5, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Tomoyuki Oku, Takeki Yazaki, Michitaka Okuno, Minoru Hidaka, Shinichi Akahane
  • Publication number: 20090109985
    Abstract: A power-saving packet forwarding device realizing electric power that accords to the number of lines in which communication is performed and a traffic volume inputted from the lines. A header processing unit with which the packet forwarding device is equipped has a plurality of packet processing circuits for performing a packet processing. A line number decision circuit monitors the number of lines in which communication is performed and a traffic volume inputted from the line, and decides presence or absence of an operation of a packet processing circuit. Based on this decision result, a power supply and a clock of the packet processing circuit that does not need to operate are interrupted, and accordingly power saving of the packet forwarding device is realized.
    Type: Application
    Filed: August 4, 2008
    Publication date: April 30, 2009
    Inventors: Takeki Yazaki, Mitsuru Nagasaka, Shinichi Akahane
  • Publication number: 20090103554
    Abstract: The present invention provides a data transfer device. This data transfer device comprises a number n (where n is an integer equal to 2 or greater) of transfer resources functioning as nodes of ring networks and connection lines connecting a number m (where m is an integer equal to 2 or greater) of ring networks and the number n of transfer resources. The connection lines are configured to be capable to connect at least some of the m ring networks and at least some of the n transfer resources. A controller controls transfer resource specified among at least some of the transfer resources to manage at least some of m number of ring networks.
    Type: Application
    Filed: February 8, 2008
    Publication date: April 23, 2009
    Inventors: Shinichi Akahane, Yasuhiro Kodama, Tomohiko Kohno, Tetsuya Nagata
  • Publication number: 20090063679
    Abstract: A network relay apparatus which conducts data transfer by using a plurality of network LSIS includes a transfer engine unit having at least two network LSIs and a central control unit which controls the operation state of the network relay apparatus. The transfer engine unit includes the network LSIs capable of changing over at least one of a clock and an operation which differ every function block, a load judgment unit for judging a load laid upon each of function blocks in the network LSI, and a frequency voltage control unit for individually changing over at least one of the clock and operation voltage supplied to each function block on the basis of the load judged by the load judgment unit.
    Type: Application
    Filed: August 25, 2008
    Publication date: March 5, 2009
    Inventors: Yoshihiro Nakao, Shinichi Akahane, Masayuki Shinohara, Atsushi Serizawa
  • Patent number: 7433301
    Abstract: A router in a backup path in an MPLS network adopting a label stack method aims to achieve the same quality-guarantee control as the one performed in a current path. In a packet transfer device accommodating first and second output lines, when the first line has a fault, upon a first packet being received, communication quality information in a header of the first packet is copied. A first header containing the copied priority information and a new label is added to the first packet, and the first packet is outputted to a second output line. When a second packet is received, communication quality information in a header of the second packet is copied, a second header containing the copied priority information and the new label is added to the second packet, and the second packet is outputted to the second output line.
    Type: Grant
    Filed: June 19, 2002
    Date of Patent: October 7, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Shinichi Akahane, Kazuo Sugai
  • Patent number: 7397765
    Abstract: In one embodiment, a bandwidth monitoring device comprises a packet receiving circuit configured to receive packets; a counter configured to count a total packet length by adding up inputted packet lengths including a packet length of a next input packet and subtracting outputted packet lengths to produce a counted value; a timer configured to time a packet receiving time; a memory configured to store a number of packet receiving times and a number of counted values counted by the counter which correspond to the packet receiving times, respectively; a counter rate-of-change calculating portion configured to calculate a change rate by a first counted value corresponding to an oldest packet receiving time stored in the memory representing an oldest time at which a packet was received and a second counted value corresponding to a latest packet receiving time stored in the memory representing a latest time at which a packet was received; and a determining portion configured to decide whether the next input packet
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: July 8, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Aimoto, Nobuhito Matsuyama, Kazuo Sugai, Hiroki Yano, Yoshihiko Sakata, Shinichi Akahane, Yuichi Ishikawa
  • Patent number: 7379454
    Abstract: A packet routing apparatus has a routing information table comprised of a plurality of sub-tables. Each sub-table includes an entry of a first format indicative of routing information, and at least one of the sub-tables includes, in addition to the entry of the first format, an entry of a second format for designating another sub-table to be referred to. A routing processor of the packet routing apparatus refers to a sub-table designated by an input line interface. As a result, when the entry of the second format is retrieved, the routing processor executes routing of an input packet and header conversion by referring to another sub-table designated by the entry.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: May 27, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Nobuo Ogasawara, Kenichi Sakamoto, Shinichi Akahane, Hiroki Yano, Tomohiro Baba
  • Patent number: 7346670
    Abstract: A secure storage system for securely accessing a storage device on a network and improving volume management scalability, consisting of a client having a VPN capability; a storage device in an SAN; a management apparatus having a means for managing a storage capacity and a logical volume allocated to the storage device; a converter for converting a protocol used in the SAN to a protocol used in a LAN/MAN/WAN and vice versa; and a conversion apparatus having the VPN capability. A VPN is provided between the client and the conversion apparatus. The conversion apparatus is provided with a mapping between the VPN and an access range of the storage device. A VPN-ID is used for identifying the VPN. An address in the logical volume is used for the access range of the storage device.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: March 18, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Kitani, Kazuyoshi Hoshino, Morihito Miyagi, Shinichi Akahane, Masahiko Mizutani
  • Publication number: 20080049778
    Abstract: Packets are relayed using a network relay device including a plurality of interface units. Each of the interface units includes one or more physical ports for connection to a line, and a bandwidth controller configured to control transmission bandwidth for packets received by the physical ports. Furthermore, a single specific physical port is selected as the output physical port from the distributed-control logical port based on output port group information unique to the output port group including the distributed-control logical port.
    Type: Application
    Filed: July 31, 2007
    Publication date: February 28, 2008
    Inventors: Hiroki Yano, Kazuo Sugai, Shinichi Akahane, Yoshinori Hachiya
  • Publication number: 20080052487
    Abstract: A network switching device includes multiple ports, multiple switching processors, and a table manager. The switching processors respectively have an address table, a output port specification module, an update requirement determination module, and a table update module. The output port specification module refers to a destination address in received data and the address table and specifies a output port for sending the data among the multiple ports. The update requirement determination module determines requirement for update of the address table with regard to a source address in the data. The table manager has an update detail acquisition module and an update request module. Upon determination of the requirement for update of the address table, the update detail acquisition module obtains an update detail of the address table from one of the switching processors. The update request module sends an update request to the switching processors, based on the update detail.
    Type: Application
    Filed: July 31, 2007
    Publication date: February 28, 2008
    Inventors: Shinichi Akahane, Mitsuru Nagasaka, Hiroki Yano, Yutaka Takagi
  • Publication number: 20080037544
    Abstract: Computing process with a computational expression is executed using seed information including at least one of destination information and source information associated with a received packet. It is preferable to select a physical port for transmission of the received packet based on the result of the computation. It is also preferable to select a port group for transmission of the received packet based on the result of the computation. Here, the computational expression is capable of being modified. Meanwhile, the physical port for transmission of the received packet is selected from a plurality of candidate ports among the plurality of physical ports. The port group for transmission of the received packet is selected from among a plurality of port groups including a mutually different candidate port.
    Type: Application
    Filed: July 31, 2007
    Publication date: February 14, 2008
    Inventors: Hiroki YANO, Kazuo SUGAI, Shinichi AKAHANE, Takao NARA
  • Publication number: 20080025207
    Abstract: A first switch flashes an FDB upon receiving an FDB flash frame and then floods a multicast group join query message (QRY1). A terminal sends a group join message (RP1) back to the first switch. A second switch, a third switch and the first switch receive RP1 and perform IGMP/MLD snooping, respectively.
    Type: Application
    Filed: February 7, 2007
    Publication date: January 31, 2008
    Inventors: Shinichi Akahane, Takahisa Miyamoto
  • Publication number: 20080008181
    Abstract: In the case of a “distributed” integrated network node (architecture), a specific judgment process cannot be executed in any routing and transferring unit. The routing and transferring unit has been required to share such judgment process related information with an enhanced processing unit or with other routing and transferring units. Thus the manufacturing cost has increased when using an enhanced processing unit and the processing speed has been lowered unavoidably when cooperation is required among routing and transferring units. Those have been conventional problems. Furthermore, if any flow is disposed during a transfer from a packet transferring unit provided in a routing and transferring unit to a processing unit, the packet is disposed regardless of the packet priority. This has also been another conventional problem.
    Type: Application
    Filed: February 26, 2007
    Publication date: January 10, 2008
    Inventors: Masaki Yamada, Mitsuru Nagasaka, Takayuki Muranaka, Yoshihiro Nakao, Shinichi Akahane
  • Patent number: 7315547
    Abstract: There is provided a packet forwarding device which always carries out high-speed search in a routing table by using a TCAM. The device includes a CAM (120) which includes a first CAM entry (120-1) to set high order bits of destination address conditions and a second CAM entry (120-2) to set low order bits of the destination address conditions, a first search unit which compares high order bits of a destination address of an input packet with the first CAM entry to search for a matching destination address condition, and a second search unit which compares low order bits of the destination address of the packet with the second CAM entry to search for a matching destination address condition when no destination address condition corresponding to the high order bits of the destination address of the packet is uniquely decided based on a result of the search.
    Type: Grant
    Filed: January 11, 2005
    Date of Patent: January 1, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Takeki Yazaki, Shinichi Akahane
  • Publication number: 20070201426
    Abstract: A method of controlling a network switching device is provided. Perform a mode-process including setting the determination-operation mode of a target switching block to a determination-operation mode that is different from the determination-operation mode of the first switching block while the first switching block is handling the switching-determination process. The target switching block is one switching block selected from the second switching blocks. Then, perform a switchover process including starting the switching-determination process using the target switching block instead of the first switching block, after completion of the process of setting the determination-operation mode of the target switching block.
    Type: Application
    Filed: July 18, 2006
    Publication date: August 30, 2007
    Inventors: Massayuki Shinohara, Nobuhito Matsuyama, Takayuki Muranaka, Isao Kimura, Shinichi Akahane
  • Publication number: 20070201461
    Abstract: A network switching device includes packet switching means and clock signal providing means. The packet switching means receive packets sent from any of the plurality of lines, determines forwarding destinations for the received packets, and forwards the received packets. The packet switching means operates synchronized with a provided clock signal. The clock signal providing means provides the clock signal to the packet switching means. The clock signal providing means is capable of switching a frequency of at least a portion of the clock signal for being provided to the packet switching means to multiple different values.
    Type: Application
    Filed: July 18, 2006
    Publication date: August 30, 2007
    Inventors: Masayuki Shinohara, Nobuhito Matsuyama, Takayuki Muranaka, Isao Kimura, Shinichi Akahane
  • Publication number: 20070204068
    Abstract: A master node transmits a probe packet for checking a condition of a network in a ring in both directions thereof to detect the occurrence of a fault on the ring. A slave node increments a hop count included in the received probe packet, transmits it to an adjacent node configuring the ring, and transmits a hop count report packet to the master node. The master node detects a fault on the ring based upon a fact that the master node does not receive the probe packet transmitted by itself. Further, the master node detects the occurrence of multiple faults and the recovery of at least one of the multiple faults based upon the sum of maximum values of hop counts in the hop count report packets received from both directions of the ring and transmits a packet for prompting the update of the database for packet transfer.
    Type: Application
    Filed: February 7, 2007
    Publication date: August 30, 2007
    Inventors: Tomoyuki Oku, Shinichi Akahane