随着数字通信电缆传输频率越来越高，为了达到宽带用户接入网最后100米的要求，对SRL的在线预测变得越来越迫切。
With the increasing of transmission frequency of data communication cable, the requirement of predicting SRL online became urgent according to the demand in last 100m of broadband user access network.
然后着重介绍了国际上对新世纪初准备实现的新一代国家通信网基础结构的具体设想，其中包括以分组为基的核心网和各种宽带接入网。
Finally, it emphatically describes the international proposals on new generation communication network for the next century, including the packet-based core network and broadband access networks.
论文首先探讨了激光大气通信在短距离图像传输，特别是在宽带接入网中应用的可行性。
Firstly, the feasibility of applying laser atmospheric communication technology to video signal transmission in short distance, especially to Broadband Access Network is discussed in the paper.
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