Abstract: When a plurality of IP packets to be relayed, which form a TCP connection, pass through a router device, converting units rewrite part of IP address information and port number information within the packets according to a predetermined rule in cooperation with a TCP connection management database. A stream linking unit extracts the information indicating the original connection destination of a TCP connection from the packets, and links two TCP connections with streams. Converting units rewrite part of the IP address information and the port number information within a plurality of packets to form a TCP connection with an original connection destination according to a predetermined rule in cooperation with the management database.

Abstract: When a plurality of IP packets to be relayed, which form a TCP connection, pass through a router device, converting units rewrite part of IP address information and port number information within the packets according to a predetermined rule in cooperation with a TCP connection management database. A stream linking unit extracts the information indicating the original connection destination of a TCP connection from the packets, and links two TCP connections with streams. Converting units rewrite part of the IP address information and the port number information within a plurality of packets to form a TCP connection with an original connection destination according to a predetermined rule in cooperation with the management database.

Abstract: A data transmission control information acquisition section generates data transmission control information based on control information exchanged between applications of a data transmitter and a data receiver before data transmission is started. A data transfer control section determines a bandwidth to be used by the data transmission, transmission start time, etc. in a shared transmission medium in a unified manner based on the data transmission control information and current bandwidth use conditions, and transmits the thus-determined information to the data transmitter. The data transmitter transmits data to the data receiver via the transmission medium under unified management.

Abstract: A data transmission apparatus having a storage device for storing at least one structure data piece of a data processing device in a receiving data processing apparatus, a computation device for computing a transmission error detection code from the structure data stored in the storage device and a device for attaching the transmission error detection code computed by the computation device to the structure data stored in the storage device.

Abstract: The present invention provides a data transmission system having a data sending unit, a data receiving unit and a data transmission medium for data transmission from the data sending unit to the data receiving unit, which comprises an element for generating feature information of data transmission from the data sending unit to the data receiving unit in advance of execution of the data transmission, an element for storing change of states of use of a bandwidth by data transmission now under execution, an element for predicting a time of completion of the data transmission now under execution based on the change of states of use of the bandwidth and the feature information of the data transmission now under execution, an element for determining a transmission rate for data transmission to be next executed at the time of completion of the data transmission now under execution based on the change of states of use of the bandwidth and the feature information of the data transmission to be next executed, and an el

Abstract: A contention control system unitarily manages a plurality of data transmissions so as to avoid contention therebetween. Data transmission command sending equipment of a data receiver continuously sends data transmission commands to a data sender according to a data transmission request. Data transmission-command receive control equipment receives the first valid one of the continuously-delivered data transmission commands therein and delivers it to data transmission control equipment. Correspondingly, data sending equipment starts to transmit data. Data transmission monitoring equipment of the data receiver monitors the state of transmission of the data.

Abstract: The present invention provides a program control system comprises plural programs each of which includes an instruction to execute a process corresponding to each of plural statuses of the system, a program memory for storing the plural programs, a program counter for outputting an address of the memory at which a part of the plural programs to be executed is stored, the address including a flag which indicates one of the plural statuses, and execution means for reading one of the programs from the program memory in accordance with the address output by the program counter and executing the read program.

Abstract: A digital data transmission apparatus includes a digital data buffer for storing digital data to be transmitted, a digital data transmitter for outputting the digital data stored in the digital data buffer to a transmission path, and a controller for controlling a transmission rate, which is an amount of data output per a unit time by the digital data transmitter, so that the transmission rate increases in accordance with passage of time.

Abstract: The present invention provides a program control system including plural programs, plural execution means each of which executes the corresponding program of the plural programs, a memory for storing the plural programs, plural program counters each of which generates an address for reading the corresponding one of the programs from the memory, and a selector for selecting an output of one of the program counters and providing the output to the memory. Each of the programs stored in the memory and executed by the corresponding one of the execution means is indicated by the address generated by the corresponding one of the program counters selected by the selector, and the memory sequentially stores instructions in each of the programs.