【摘要】 xDSL是目前流行的宽带铜线接入技术,其中ADSL具有上行和下行速率不对称的传输特点。通过对ADSL的技术原理、标准、接入模型、接入网物理层的各项指标测试方法的研究,认为ADSL是现阶段实现用户宽带接入的较好方法。更多还原

【Abstract】 As a copper-based board band access technology,xDSL is prevalent.As a branch of xDSL, ADSL features a different up and down asymmetrical speed.By surveying ADSL’s technological principles,standard, access model and its physical layer indexes testing, it can be concluded that ADSL is a good solution to wideband access.更多还原