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Digital data dynamic transmission systems which employ asynchronous time multiplexing are introduced with the experimental equipment of one of the systems. It is possible to attain dynamic matching between information sources even with time-varying parameters and transmission lines, by searching a time slot for each information signal block only when the subscriber has an information signal block ready to be transmitted. For the experimental system, the transmission delay time and the rate of channel busy time are derived by analytical methods and computer simulation under the specific conditions. By adding a priority transmission function to the experimental system, the system becomes capable of handling both on-line traffic and offline traffic. If proper sizes of buffer memories are chosen, it is possible to transmit various informations from various information sources being endurable against overload traffic.