Fujitsu Corporation

Fjuitsu Limited

Takumi Iwai

Kenji Fukunaga

Atsuki Taniguchi

Kazuo Takatsu

Takao Nakamura

Shuichi Nakagawa

Yoshinari Oshio

Seigo Sawada

Shinichi Hara

Akihiro Takahashi

Mikiko Tamori

Tsuneyuki Takai

An IP address and a MAC address of each of communication devices connected to a plurality of communication ports provided in a switching hub device are associated in an ARP table. Also, priority information representing the communication priority of each communication device is received, and the received priority information is associated with the MAC address of the communication device. When no IP address of a transmission source included in a data packet received at each communication port exists in the ARP table, the IP address and the MAC address of the transmission source are added to the ARP table and priority information is attached to the ARP table.

Relay device, communication system, communication method, and computer program

The present invention is a technology concerning a reception pointer processing in an SDH transmission system. The objects of the invention are to identify automatically a frame size (frame composition) of the received transmission frame in the SDH (SONET) transmission system and to perform flexibly and rapidly a reception pointer processing corresponding to the frame size. These objects are realized by providing a reception pointer processing apparatus for performing the pointer processing of the transmission frame transmitted by the SDH transmission system, wherein the reception pointer processing apparatus comprises a pointer processing section for executing the required pointer processing of each unit frame contained in the transmission frame, and a frame composition identification section for identifying automatically the frame composition of the transmission frame based on the pointer processing result of the pointer processing section and for providing the identification result to the pointer processing section.

Reception pointer processing apparatus in SDH transmission system

A communication control apparatus includes a master communication control unit for performing communication control for a plurality of slave units, and an intermediate communication control unit which performs the communication control for each slave unit instead of the master communication control unit. The intermediate communication control unit includes a memory section for holding transmission data necessary for slave unit communication processing and response data, which is a response to the transmission data, a transmission/reception section for sending the transmission data and for receiving the response data, and a communication processing control section. The communication processing control sections sends the transmission data in a predetermined order to the slave unit, which writes the response data received in a predetermined order into the memory section, and notifies the master communication control unit of the completion of the communication processing by using an interruption signal when the communication processing is completed.

Intermediate communication controller that sends transmission data in a

In a method and apparatus for transferring data between a master unit MU, and slave units SU0, SU1 . . . SUX according to a synchronizing signal generated by the master unit MU, the master unit MU outputs information specifying a unit to be a data transferring source, and the unit corresponding to that information transmits data held by the unit itself and the other units so that, data transferring is performed between the units MU, SU0, SU1 . . . and SUX, and it becomes possible for all the units including the master unit to receive data from the data transmitting source.

Method and apparatus for transferring data between a master unit and a

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Osaka, Japan

Takumi Iwai