| 摘要 |
A frame multiplexer includes a plurality of counters each of which is provided for each of the lines. A flow monitoring unit monitors frame flow of each line by referring to the counter of the line, and adds length of a passed frame to a value of the counter. A bandwidth managing unit cyclically selects one of the lines through which a frame is input, and subtracts a predetermined token value from a value of the counter of the selected line. An output control unit stores a frame passed through the flow monitoring unit in a queue buffer, and outputs the frame at an output rate of the frame multiplexer.
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