1) 实现比特填充技术和循环冗余校验算法；

2) 实现HDLC的组帧（Flag、A段、C段、D段、FCS、Flag、包括扩展模式）；

3) 实现滑动窗口、差错控制机制；

4) 模拟无噪声链路的数据传输，发送端随机发送数据帧（能够模拟帧丢失、帧失序、帧重复）；

5) 模拟有噪声链路的数据传输，发送端发送模拟单比特错误（有能力的同学可以考虑加入多比特错误），要求错误出现在HDLC帧的不同字段，并能够模拟差错控制方法（帧损伤）；

6) 给定HDLC的比特流，分别用Manchester编码和键控编码方法来模拟实现并给出结果。

-1) to achieve bit-stuffing technique and cyclic redundancy check algorithm　2) achieve HDLC framing (Flag, A section, C section, D segments, FCS, Flag, including the extended mode)　3) to achieve the sliding window, error control Mechanism　4) analog noise-link data, the transmitting side transmits the random data frame (frame loss to simulate the frame out of order, frame repetition)　5) analog noise data transmission link, the transmitter sends the analog single-bit error (students can be considered capable 加入多比特 error), an error occurs in the different fields required HDLC frames, and can simulate the error control method (frame damage)　6) given HDLC bit streams, respectively, with the Manchester coding and keying coding methods and simulation results are given.