利用数据链路层原理，设计一个滑动窗口协议并在仿真环境下编程实现有噪音信道环境下的可靠的双工通信。信道模型为8000bps 全双工卫星信道，信道传播时延270 毫秒，信道误码率为10-5，信道提供字节流传输服务，网络层分组长度在240~256字节范围。-Data link layer using the principle of a sliding window protocol design and simulation environment in the programming channel noise environment duplex reliable communication. 8000bps channel full-duplex satellite channel model, channel propagation delay of 270 ms, channel bit error rate of 10-5, byte-stream channel to provide transmission services, network layer packet length in the range of 240 ~ 256 bytes.