Patents by Inventor Shigetoshi Nakai

Shigetoshi Nakai 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).

  • PACKET SWITCH, TRANSMISSION DEVICE, AND PACKET TRANSMISSION METHOD
    Publication number: 20140022903
    Abstract: A packet switch includes an ingress unit configured to divide packet data into a plurality of segments, and allocate each of segments to any one of a plurality of links, a switching fabric unit configured to include a plurality of switches, each of switches switching the segments to the links in accordance with destinations of the segments, respectively, and an egress unit configured to receive the segments, and reconstruct the segments in the packet data, wherein the ingress unit transmits the segments to the links on which no back pressure signal is transferred and another link on which the back pressure signal is transferred and on which the segment have not been transmitted in specific period, based on a back pressure signal supplied from each of switches and a transmission flag indicating whether or not the segment have been transmitted to the links.
    Type: Application
    Filed: May 14, 2013
    Publication date: January 23, 2014
    Inventors: Akio SHINOHARA, Satoshi Nemoto, Shigetoshi Nakai
  • Packet transmission device and packet transmission method
    Patent number: 7546496
    Abstract: A packet transmission device that is connected to a plurality of communication lines, and transmits a packet received, includes a failure detecting unit that monitors a condition of the communication lines, and detects a failure in the communication lines; and a packet transmitting unit that transmits, when the failure detecting unit detects a failure in a communication line, and when a packet having a same transmission-destination address as an address corresponding to a port of the communication line in which the failure has been detected is received, the packet from all preset ports.
    Type: Grant
    Filed: February 25, 2005
    Date of Patent: June 9, 2009
    Assignee: Fujitsu Limited
    Inventors: Toshinori Koyanagi, Hideo Sunaga, Satoshi Nemoto, Shigetoshi Nakai
  • Packet transmission device and packet transmission method
    Publication number: 20060107188
    Abstract: A packet transmission device that is connected to a plurality of communication lines, and transmits a packet received, includes a failure detecting unit that monitors a condition of the communication lines, and detects a failure in the communication lines; and a packet transmitting unit that transmits, when the failure detecting unit detects a failure in a communication line, and when a packet having a same transmission-destination address as an address corresponding to a port of the communication line in which the failure has been detected is received, the packet from all preset ports.
    Type: Application
    Filed: February 25, 2005
    Publication date: May 18, 2006
    Inventors: Toshinori Koyanagi, Hideo Sunaga, Satoshi Nemoto, Shigetoshi Nakai