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.
接受方和发送方必须具有相同的帧长相同的校验方式，和相同的终止位。
Receiver and transmitter devices must have the same word length, the same parity and the same number of stop bits.
通过使用帧方式、CRC校验和选择重发纠错功能保证了协议的可靠性，该协议在一定程度上还可得到扩充。
The reliability of the protocol can be ensured by use of the frame format, CRC check, and correct function of selecting and sending repeatedly. The protocol can be extended to a certain extent.
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