来信收到无误。
为了确保你能够在正常的时间范围里收到印有你名字，并且拼写无误的证书，你必须确认你的姓名和地址。
To ensure you receive your Cisco Certified Network Associate certificate with the correct spelling of your name and in a timely manner, we must confirm your name and address.
PLC每接收到一帧数据，对该帧数据进行异或校验，如果无误则存送到指定缓冲区，如果有误则请求重新发送。
When PLC receive one frame data, it checkout the frame. If the data is correct, it is saved in the appointed buffer. If not, PLC request the IPC resend it.
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