Data communication system and data communication method

Abstract

An IP terminal (1) at a transmitting end has a copying part (111) for copying packet data to be transmitted; an address setting part (112) for adding unique address information to the respective copied packet data having the same contents; and a transmitting part (113) for outputting, based on the address information, the copied packet data to different paths (1,2) on an IP network (3). An IP terminal (5) has a selecting part (523) for selecting and acquiring the first-arriving packet data of the copied packet data having the same contents. In this way, for a data communication in a communication network such as Internet, a plurality of communication paths are used in a packet network, thereby reducing packet jitter and loss at the receiving end and providing a real time service having substantially the same quality as in a line exchanging network.

Description

technical field [0001] The present invention relates to a data communication system and a data communication method for transmitting and receiving packet data for IP packetized voice data such as IP telephones and the like for real-time service in a communication network constructed by connecting communication lines to each other through the Internet or the like . Background technique [0002] In recent years, data communication in a communication network constructed by connecting communication lines to each other through the Internet or the like has been developed. In this data communication, a packet communication method is employed in which data to be transmitted and received is divided into minimum units to create IP packet data, and the IP packet data is transmitted and received one by one. In addition to the actual data, this IP packet data includes control information such as an address of a transmission destination, location information indicating which part of the ...

AI Technical Summary

Problems solved by technology

[0007] However, in the technique disclosed in the above-mentioned Patent Document 1, it is necessary to provide a delay circuit at each node on the communication network, and there is a possibility that the cost of the equipment is extremely high.

In addition, in the technology disclosed in this patent document 1, the delay amount of the signal output from the output port and returned via the communication network is determined based on the detection result in the delay circuit of each node, so there is a problem that detection cannot be performed in real time.

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