System and method for higher throughput through a transportation network

The system which transmits data to an address network from a sauce network via a transport network, and its method. The data-communications unit (DTU) from a sauce network is received by the server located on logic between sauce and a transport network. It is subdivided to the 2nd DTU and these 1st DTU is transmitted to an address network via a transport network. Furthermore, it is coded or the 2nd excessive DTU is transmitted. This thing [that regeneration of the 1st original DTU is carried out even if it is coded or some of the 2nd DTU lose the 2nd excessive DTU] is made possible. That these 2nd DTU coded is a copy of the 2nd DTU only transmitted たり -- parity -- they can be the 2nd DTU or the 2nd DTU coded using the disappearance correction mark. In an address network, the 2nd DTU is received, and it is used in order to carry out regeneration of the 1st original DTU. When an insufficient number of the 2nd DTU that cannot carry out regeneration of the 1st original DTU is received, retransmission of message of the 2nd DTU is requested.