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摘要

A communication system and a node point of a data network for transmitting a baseband data signal between at least one data terminal connected to a communication system comprising a coaxial cable network, and an external data network or server, which node point comprises connection means for connecting the node point to a coaxial cable network. The node point of a data network is arranged to control its receiver to a receiving mode for receiving data from said data terminal; and to send idle data periodically to said data terminal in order to control the data terminal to a listening mode.