| 摘要 |
When the number of connections which can be simultaneously established between a server unit and client units is limited in the server unit, the server unit according to the present invention enables to simultaneously conduct two-way communication with many client units. There are provided a plurality of client units, a server unit, and a repeater, wherein each of the plural client units includes a client-side communication module to transmit data to the server unit via an uplink connection established between itself and the server unit, the server unit includes a server-side communication module to send data to be sent to the client unit via a junction line to the repeater, and the repeater includes a repeater-side communication module to transmit the data sent from the server unit to the plural client units via downlink connections established between itself and the plural client units.
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