| 摘要 |
An information communication network system, including a plurality of information communication devices to which at least one information device is connected, tree shaped or star shaped bidirectional transmission lines for connecting the information communication devices, and at least one central information communication control device located upward of the bidirectional transmission lines. The central information communication control device includes an access control information generating device, and a downward transmission device. Each of the plurality of information communication devices includes an access control information receiving device, and an information communication control device.
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