一、前言ITU－T建议采用异步转移模式（ATM）作为实现宽带业务综合数字网（HISDN）的手段，利用ATM实现多样化的通信业务传输已指日可待。为了有效地实现ATM网，不仅需要ATM技术，还需要外围操作技术等的创新。特别是由于以下的理由，可以认为在ATM网中需要基于新概念的业务量 I. INTRODUCTION ITU-T recommends using Asynchronous Transfer Mode (ATM) as a means to implement Integrated Services Digital Network (HISDN) for broadband services. It is just around the corner to realize the diversified transmission of communication services using ATM. In order to effectively implement the ATM network, not only ATM technology but also peripheral operation technology is required. In particular, for the following reasons, it can be considered that traffic in the ATM network needs to be based on a new concept