fcs frame check sequence
FCS帧校验序列
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The frame is completely received before it is relayed as the Frame Check Sequence (FCS) is to be calculated and the frame discarded if in error.
数据包被转发前需要被完全接收下来，并且计算帧校验序列，该序列值错误的包将会被丢弃。
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