摘要： VDSL 即非常高速数字环路继ADSL之后的新一代数字环路技术。 它具有更高的传输速 率以及足够长的传输距离。 其中IP-VDSL是基于可变长度封包的 VDSL技术，应用于以太网协议时可以提供在最长1.5km的条件下达到上下行10Mbps对称的数据率。 该技术在最后一公里的接入中具有非常广泛的应用前景。该文首先介绍了IP-VDSL的传输协议，然后对VDSL的会聚链路层进行了分析并采用专用芯片实现了VDSL调制解调器，最后对信噪比和串扰等问题进行了讨论。

关键词: M-QAM, VDSL, 宽带接入, 数据传输

Abstract: VDSL, very high speed digital subscriber loop, is the next generation digital subscriber loop technology after ADSL. It has higher throughput rate and long enough transmission reach. In which, IP-VDSL, or transmitting variable length packets over VDSL can reach 10Mbps symmetric at up to 1.5km reach. It is attractive in last mile access. This article first introduces IP-VDSL transmission protocol, then analyzes link convergence layer and implements VDSL modem with ASIC. Finally, this article discusses signal noise ratio versus crosstalk issues.

中图分类号: 

• TP393.03