ATM技术问世于九十年代初期，已经成为集中传送包括声音和视频在内的所有信号的最佳网络技术。ATM已经使很多大公司受益。中小型公司因其带宽需求低、费用昂贵及ATM最低接入带宽的限制等因素，一直被排斥在ATM大门之外。最近推出的新型接入设备，使得具有多种信号传输业务需求 The advent of ATM technology in the early nineties has become the best network technology to focus on delivering all the signals, including voice and video. Many large companies have benefited from ATM. Small and medium-sized companies have long been excluded from the ATM gate because of their low bandwidth requirements, high cost, and limitations on the minimum ATM access bandwidth. The recent introduction of new access equipment, making a variety of signal transmission business needs