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由于技术的飞速进步，使高速铜线接入系统具有较高的性能价格比，高速铜线接入将在世界各国得到广泛应用。本文全面介绍了各种高速铜线接入系统的线路编码方案，结合具体的应用环境详尽分析比较了它们的优劣之处，并对未来的趋势走向提出了自己的见解。
Due to the rapid progress of technology, the high-speed copper access system has high performance-price ratio. High-speed copper access will be widely used in various countries in the world. This paper introduces a variety of high-speed copper access system line coding scheme, combined with the specific application environment detailed analysis of their strengths and weaknesses, and put forward their own views on the trend of the future.