一、ＡＴＭ一ＰＯＮ的引入 随着用户对业务种类的需求越来越多，电信网向着宽带化多媒体化发展，接入网成了电信网的瓶颈，为此人们提出了许多方案来解决这个问题，如以现有铜线为基础的 ｘＤＳＬ（包括 ＨＤＳＬ，ＡＤＳＬ，ＶＤＳＬ），光纤同轴混合网（ＨＦＣ）等。而最有前 First, the introduction of ATM-PON As users demand more and more types of services, the telecommunications network towards broadband multimedia development, access network has become the bottleneck of the telecommunications network, for which people have proposed many solutions to this problem Such as xDSL (including HDSL, ADSL, VDSL) and fiber coaxial hybrid network (HFC) based on the existing copper wire. The most advanced