本文介绍线路设计中所应用的两种程控信号衰减电路。
Two kinds of program control signal attenuation circuits, which are used in circuit design, are introduced.
但由于电力线路存在着强噪音、信道衰减等原因，严重影响了通信质量。
But, there exists serious noise and channel attenuation in power line and they affect the quality of communication seriously.
文章对线路维护工程中的光缆线路障碍查找、光纤衰减均匀性、光纤接续和偏振模色散（PMD）等问题进行了分析。
This paper discussed the trouble shooting, attenuation uniformity of optical fiber, optical fiber splicing and PMD problem in the maintenance of optical fiber line.
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