Fujitsu Corporation

Tsuneo Katsuyama

Ken Yokoyama

Shinji Kikuchi

Kuniaki Shimada

Takeshi Kawasaki

Eiichi Takahashi

Toshihiko Kurita

Takeshi Aoki

Koichi Takaba

Hiroyasu Kageyama

Yuji Nomura

Satoru Watanabe

Masanobu Morinaga

Noriyuki Fukuyama

Takeshi Yasuie

Jun Kakuta

Hideaki Miyazaki

Katsutoshi Yano

Toshihiro Azami

Yu Minakuchi

Toshimitsu Suzuki

Yuji Imai

Masaaki Wakamoto

Souichi Okada

Hajime Kamata

Tetsuya Okano

Satoshi Nojima

Mitsuhiro Kishimoto

A packet processing unit and a session managing unit, which are conventionally arranged in a server, are arranged in a network connecting device, and the network connecting device performs a packet relay process based on session management. As a result, the load on a server is reduced, and a process by the server is performed faster.

Packet relay processing apparatus

A computer-readable recording medium recording a program capable of accurately analyzing the cause of a performance fault at the very end point of a client system, server system, etc. Outgoing and incoming packets are captured during execution of a communication application to measure a round trip time, and a communication window size of the transmitting source is estimated based on the captured incoming packets. A throughput estimate is calculated from the round trip time and the communication window size, and the estimated value and actual measured value of the throughput are displayed on, for example, a display, together with various other communication parameters including the communication window size and the round trip time, whereby the cause of a performance fault can be accurately located by quantitative analysis.

Recording medium, fault analysis device and fault analysis method

A TCP communications performance measuring device obtains an effective bandwidth (a transfer speed) representing performance in TCP communications, wherein performance indexes or both of a round trip time and a maximum segment size which are obtained based on TCP communications variable-length packets transmitted and received pursuant to a TCP (Transmission Control Protocol) defined as protocol of a transport layer of the OSI Reference model, and any one of an average congestion window size, a packet discard rate and a packet discard event rate. The measuring device therefore includes a packet monitoring unit, a performance index detecting unit a session management unit a session management table and a performance calculating unit The measuring device is capable of measuring the performance in the TCP communications on a communications route of a network without specially transmitting the multiplicity of measurement-oriented packets to the network.

Apparatus for and method of measuring communication performance

A communications network control system includes a packet judging circuit for judging whether a variable-length packet inputted via a network is a control packet CPKT self-addressed and containing control information for network control, or a transfer packet TPKT that should be transferred to other addresses, and a control information management circuit for receiving the control packet judged to be the control packet by the judging circuit via the network, and managing and processing the control information, based on the received control packet. This system further includes a routing table management circuit for storing the control information transmitted to the network from the management circuit in such a way that the control information can be updated as well as for controlling a transfer of the transfer packet, and a packet rewriting circuit for executing a process of rewriting contents of the transfer packet in accordance with the control information stored in the table management circuit in parallel with a process of the control packet by the information management circuit in order to transfer to another network the transfer packet judged to be the transfer packet by the judging circuit.

Communications network control system

An electronic conference support system having a structure in which one main common information processing apparatus having a common display unit having a size sufficiently large for attendants to commonly look and some personal information processing apparatuses for permitting each attendant to exclusively create, display and edit information adjacent to each attendant are connected to one another to form a network communication structure through a data communication passage. When a certain attendant acquires an operation right, an information input space is displayed on the personal display unit of the attendant while permitting the attendant to input information. Information inputted to the information input space is, after completed and as an information object, displayed on the common display unit of the common information processing apparatus and the personal display units of all of the personal information processing apparatuses. The attendant of the conference is enabled to easily input information and other attendants who look the attendant's operation are enabled to be free from adverse stimulus.

Conference support system with user operation rights and control within the conference

A control method and apparatus for distributing packets to nodes in a cluster, while realizing a single system image at the network address level and such as to be able to simply and dynamically change the distribution destination, conditions of distribution, and the like. A pattern matching unit in a relay device receives packets coming from a packet receiving device. The packets have an address which represents a cluster. Using a distribution control table, pattern matching is performed based on the transmission origin address, transmission origin port, destination port and the like of this packet. A hash calculation unit, from the matching result, performs a hash calculation obtaining the argument of a hash function. A destination node extraction unit sets the destination node of the packet based on the hash result, using the distribution control table.

Packet relay control method packet relay device and program memory medium

A multiwindow display control method and apparatus for easily controlling a display of a plurality of groups of windows each group including a plurality of windows. The invention includes plural frame memory control units each storing pixel data to be displayed on one of the windows, a first group number of a group of windows to which the window belongs, and a priority number for identifying a display priority among the windows included in the same group of windows. The invention further provides an outline generating unit for generating a second group number each identifying one of the group of windows; a pixel data arbitration unit for determining a group of windows having the first group number which coincides with the second group number, and for determining a window to be displayed having a highest priority number of the determined group of windows; and a display unit for displaying pixel data of the determined window.

Multiwindow display control method and apparatus

Growing community of inventors

Kawasaki, Japan

Tsuneo Katsuyama