| 摘要 |
An upstream communication device notifies a downstream communication device of NEXP( 0 ), which indicates a data reception state at the upstream communication device, and the downstream communication device compares it with NEXP( 1 ), which indicates a data reception state at the downstream communication device. By comparing the reception states (arrival/non-arrival) of each unit of data, it is possible to determine whether or not each unit of data is normally transmitted, and, if data is lost, it is possible to identify a link in which the data is lost.
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