Hitachi, Ltd.

Yukio Shimamoto

Hidemitsu Higuchi

Toshikazu Yasue

Toru Horimoto

Takahisa Miyamoto

Yukio Nakata

Atsushi Kobayashi

Takuo Tsuzuki

Takuo Kusaba

Kei Toga

Katsunobu Okuda

Natsuki Karaki

A communication control system and method of implementing a high-speed data transmitting and receiving process uses a communication protocol program, a protocol buffer which is managed by the communication protocol program, a communication controller for controlling a transmission line and a network buffer managed by the communication controller.

Communication control method and apparatus utilizing a shared buffer which is shared by a system processor and a communication controller using a virtual address or a real address

A transmission apparatus used for resolving an ATM address and provided between a terminating node communicating with another terminating node by using a layer- address and an ATM-switch network. A transmission apparatus includes a first apparatus which receives an ATM address of another transmission apparatus and a layer- address of a terminating node connected to another transmission apparatus from another transmission apparatus, and catalogs ATM address and layer- address into a table, and a second apparatus which searches the table using a layer- address of a destination terminating node which is a destination of a transmission of data received from a source terminating node connected to a transmission apparatus to acquire an ATM address of another transmission apparatus connected to destination terminating node, and communicates with another transmission apparatus by using the acquired ATM address to transmit a cell including information of a layer- address of destination terminating node.

ATM-address resolving transmission apparatus

A video distributing apparatus for storing video data and distributing it to a viewer has a memory for video data and a schedule table for holding a distribution schedule of the stored video data A controller controls the distribution of the stored video data. A reservation request includes a title of the video data to be distributed, a channel to be used for distribution of the video data of the title, and information to designate a time to start the distribution.

Video distributing apparatus and video distributing system

A data communication system comprising a system processor, an application program assigned to an application buffer it controls, a communication protocol program assigned to a protocol buffer it controls, a communication controller for controlling communication lines, and transmitting and receiving buffers controlled by the communication controller. Data is copied at high speed among the application buffer, protocol buffer, and transmitting and receiving buffers in the same byte-based increments as those in which the system processor handles data. The fast data movement among the buffers boosts the throughput of the entire communication system.

Method of data communication and system for carrying out the method

A communication control system and a method of implementing a high-speed data transmitting and receiving process uses a communication protocol program, a protocol buffer which is managed by the communication protocol program, a communication controller for controlling a transmission line and a network buffer managed by the communication controller. Further, there is provided a shared-buffer which is shared by the protocol buffer and a communication buffer. Frame data from a transmission line is shared by the shared-buffer, so that the frame data is directly written to and read from the shared-buffer by means of a shared-buffer control. Since the buffer is shared between the transmission line and the protocol, no excessive movement of data is required, thereby improving the throughput of the communication system as a whole.

Communication control system utilizing a shared buffer managed by high and low level protocols

Communication control system utilizing a shared buffer composed of first

A multi-protocol communication control apparatus which includes a plurality of kinds of upper layer protocol controllers, a plurality of kinds of lower layer protocol controllers, and a common interface controller for processing correspondence between the upper and lower layer protocols controllers. The multi-protocol communication control apparatus provides for the optional use of any combination of a plurality of kinds of upper layer communication protocols, a plurality of kinds of lower layer communication protocols, and a plurality of transmission lines.

Multi-protocol communication control apparatus

A data transfer system for transferring data among plural terminals which are connected through a transmission line. each terminal capable of performing distributed processing and includes an unit for delivering on the line a first signal having an identification information of a user who utilizes the terminal and an identification information of the terminal and a unit for delivering on the line a second signal having an identification information of a destination user to which data is to be transferred as an identification information of the terminal which is a delivery source of the data. At least one of the terminals includes a memory for receiving the first signal on the line and for storing the identification information of the user and the identification information of the terminal of the first signal in a manner that history of the received identification information of the terminal is stored for each of the identifications of the users, and an unit for receiving the second signal on the line, for searching said memory on the basis of the identification information of the destination user of the second signal to read out a newest one of the stored identification information of the terminal associated with the received identification information of the user of the second signal and for delivering on the line a third signal having the read identification information and the identification information of the second signal.

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Yokohama, Japan

Yukio Shimamoto