| 摘要 |
In a relay unit for relaying frames between a sending source and a receiving end by transmitting the frames from a transmitting-receiving buffer to the receiving end after the frames received from the sending source have temporarily been stored in the transmitting-receiving buffer, the frames are in the transmitting-receiving buffer, while the storage positions of the frames in the transmitting-receiving buffer are being managed in order of storage. Each time a new frame is stored in the transmitting-receiving buffer after the number of the frames in the transmitting-receiving buffer has reached a predetermined number, the storage area, in which the oldest frame among the frames is stored, is released from the transmitting-receiving buffer. With this arrangement, by contriving how to utilize the transmitting-receiving buffer, tracing a frame can be performed at high speeds, without providing a dedicated storage area for storing trace information and incurring complexity of the process.
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