According to the review and comparison of today ' s adsl test instruments , the author finds the lack of the traditional test methods and indicates that easy to use , versatility and extensible are crucial aspects to design an adsl test instruments . the author also bring up a new method , the adaptive test method which can be used to test the adsl ' s transmission characters on the whole band dynamically 通过对国内外现有adsl检测设备的特点进行总结和比较之后，找出了传统测试方法的不足之处,指出易用性、通用性和可扩展性是设计adsl测试仪表的关键，提出了新的adsl线路传输特性的检测方案? ?使用自适应算法实现对adsl整个频段的衰减情况动态测量，并且在matlab上进行了仿真。
This article briefly presented the principle of lower voltage power line carrier technology and spread spectrum technology , and discussed the advantage , the mode , the current state of spread spectrum technology applied to lower voltage power line carrier communication , and analyzed the channel transmission characters of lower voltage power line with mechanical contact 在本文中，简要阐述了低压电力线载波技术和扩频技术的原理，讨论了扩频技术在低压电力线载波通信中应用的优点、方式和现状，并通过大量实验，分析了带机械接触的低压电力线路的传输特性。
