| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress the decrease of throughput in a radio section and to reduce a traffic in the radio section by allowing a master unit to prepare a table in which a multicast list is made to correspond to subordinate slave units and to transfer only the kind of a frame registered in the table to a slave unit side. SOLUTION: A master unit 1 acquires multicast table information held by a slave unit 2 and prepares a multicast list table 11. Then, the unit 1 transfers a multicast frame only to a slave unit made an entry to the table 11 among multicast frames caused to flow on the basic line of a LAN. That is, when the unit 1 transfers a multicast frame from the basic line to a slave unit side, the unit 1 refers to the table 11, decides whether a frame of a transfer object is made an entry to the table 11, and transfers the multicast frame to the corresponding slave unit 2 only when the frame is made an entry.</p> |
