| 摘要 |
An estimating unit includes: an error detecting unit which detects an error among a plurality of frames received from an interface unit of a transmission device; a request sending unit which produces a first frame including a data collection request for requesting data collection upon the error detecting unit detecting the error, and which sends the first frame to the interface unit; an extracting unit which extracts, from the plurality of frames received from the interface unit, a second frame including the error detected by the error detecting unit and a third frame including a reply of the interface unit to the data collection request; and a saving unit in which the second frame extracted by the extracting unit is saved.
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