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HDSL（高速数字用户环路）技术是在双绞铜线上进行高速数据通信的新技术，它采用2B1Q和CAP编码传输技术，可为现有的电话用户提供宽带业务。本文详细论述了HDSL的基本结构、关键技术、性能及其应用前景。
HDSL (High Speed Digital Subscriber Loop) technology, a new technology for high-speed data communications over twisted pair copper wire, uses 2B1Q and CAP-encoded transmission technology to provide broadband services to existing phone users. This article discusses in detail the basic structure of HDSL, key technologies, performance and application prospects.