Its basic component is a terminal-to-terminal connected communicating network, which use Asynchronous Transfer Model (ATM) and can realize constant bit rat (CBR) and variable bit rat (VBR).

• 它的基本组成部分是一个采用异步转移模式 (ATM)交换的能实现固定比特率 (CBR)和可变比特率 (VBR)的端至端连接的通讯网。