This paper is based on the development of ADSL system. It includes the architecture of ATM over ADSL broadband access network. We concentrate our attention on hardware and software function designs of ATM over ADSL ATU C and ATU R cards.

• 以 ADSL系统研制为基础 ,介绍了采用 ATM overADSL结构时宽带接入系统的构成 ,重点介绍了该方式下 ADSL局端线路卡和用户端系统的软、硬件实现。