Abstract: The transmission server according to the present invention includes a processor, buffer memory, an I/O bus, and a transmission unit. Furthermore, the transmission unit includes a transmitting unit for controlling the generation and transmission of a packet, buffer memory for holding transmission data provided by the processor, and an NIC for connection to a network. The processor manages receivers, and transfers data in the buffer memory to be transmitted to the transmission unit connected to the I/O bus. The transferred data is stored in the buffer memory of the transmission unit. The transmission unit generates a packet for each receiver from the data in the buffer memory according to the receiver information, and transmits the data to a network through the NIC.

Abstract: In a network 101, a relay 104 makes a name search of a communication destination node 102d based on a request from a communication source node 102s according to a condition into which at least one or a plurality of information effective for identifying the communication destination node 102d, such as the running state, the use state, the positional information, and the information representing the characteristic of the communication destination node 102d, information representing the information held by the communication destination node 102d, and the like are combined. The relay 104 makes a reply by searching a database of a DNS, etc. for information identifying the communication destination node 102d, or obtains and replies the information by actually inquiring the communication destination node 102d at the time of an inquiry.

Abstract: A retrieval key to be used for the retrieval of a table is divided into a plurality of divided retrieval keys consisted of a plurality of bit strings. Each divided retrieval key is provided with a corresponding retrieval table. Further, the size of the table to be retrieved by one divided retrieval key is made to be smaller than the size of a table to be retrieved one time by a whole retrieval key. First, the first retrieval table is retrieved by the divided retrieval key (A bits). If the result is obtained, the result is outputted unchanged. If the pointer to the second retrieval table is obtained, the second retrieval table is retrieved by the other divided retrieval key (B bits). In this way, a retrieval process continues using the divided retrieval keys.

Abstract: A table storing a state transition rule is arranged in a memory. By referencing the table based on input data, the process to be performed for the input data is determined and executed. Additionally, a process capability can be changed by altering a setting in this table. As a result, a data processing device that can perform the processes for general-purpose data, such as a stream data process, etc., at high speed, and can flexibly change a capability according to the circumstances.

Abstract: A transmitting side relay device comprises additional information generation means for generating additional information about the characteristics of a data stream, packet generation means for generating a packet by attaching additional information to each transfer unit and transmitting means for transmitting the packet to the third network according to prescribed procedures. A receiving side relay device comprises separation means for breaking down the received packet into additional information and a transfer unit, analysis means for analyzing the additional information, reproduction means for locating information included in a corresponding transfer unit in an appropriate position and reproducing the data stream and output means for outputting the data stream reproduced by the reproduction means to the second network.

Abstract: At least three control patterns are used for a connection management control of nodes in a ring network, each node determining a changeable communication status in accordance with a communication status of the own node and the nature of the control pattern received from an upstream node. The own node transmits one of the control patterns, selected in accordance with the changes in the communication status, to the downstream node. The control patterns indicate respective conditions of the own node so that the communication enable status of the ring network, as a whole, can be autonomously established by the nodes per se without employing a monitor node or supervisory node.

Abstract: A communication control device connected through at least one network to a computer system for carrying out transmitting processing and receiving processing of data in accordance with a communication protocol includes: a transmitting processing unit for setting an information address of communication control information stored in a table in a communication data frame having a communication data and transmitting the communication data frame; a receiving processing unit for receiving the communication data frame and a response data frame having the information address; and a response inspection processing unit for inspecting the response data frame received by the receiving processing unit, accessing the communication control information set in the table using the information of the communication control information obtained from the response data frame, and carrying out a transmitting completion processing or re-transmitting processing based on the accessing.

Abstract: In a multiprocessor system, wherein each local group a processor its local memory are included, and the local memory is accessed from a processor either in a same group or another group through a communication media. The system according to the present invention is provided with a LOCK flag, a SYNC flag and a control circuit for controlling accesse to the local memory by a processor of the same group and a processor of the other group depending on the status of the flags. The LOCK flag inhibits reading from the memory by the other processor while the same group processor is writing therein. The SYNC flag permits reading of the memory by the other processor and inhibits the same group processor from writing therein. A read request as well as a write request to the memory from both processors are input to the control circuit which controls conveyance of the requests to the memory.