Based upon a number of received user codes, a receiver defines a frame of symbols containing at least one window.

根据一组收到的使用者编码，接收器定义了含有至少三个符号之视窗的画面。

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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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