When the network interface receives a packet from the layer above, it adds a preamble and CRC.
当网络接口层从它的上一层收到一个数据包时，它就加上一个前同步信号以及循环冗余校验（CRC）。
Using traditional transmission power control mechanism in data link layer of wireless AD hoc network may result in the increased packet collisions among nodes which use different transmission power.
在无线自组织网数据链路层中，采用传统的功率控制机制会引起不同发射功率节点间的分组冲突。
The statistic curve of HDV system packet loss rate positively correlates to the curve of network layer, but the correlation coefficient is only about 0.83.
高清视频应用的丢包率与网络层丢包率的统计曲线模态正相关，但相关系数仅在0.83左右。
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