使帧特性帧校验序连接指种数据封装。
HDLC specifies a data encapsulation method on synchronous serial links using frame characters and checksums.
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。
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.
换句话说，校验字节的监测和检测过的SONET帧的不同部分中的错误。
In other words, parity bytes monitor and detect errors over different parts of a SONET frame.
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