| 摘要 |
A data transmission apparatus and a data transmission system, and more particularly, a data transmission apparatus which includes a detection unit for detecting a bandwidth of data transmission actually used in a transmission line, a calculation unit for calculating a bandwidth required for transmission of data to be transmitted, and a requesting means for requesting, when the bandwidth of data transmission actually used in the transmission line varies, a management apparatus for the transmission line to set a bandwidth in the transmission line in response to the bandwidth calculated by the calculation means.
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