从九十年代初期,国内外各大电信公司投入巨额资金加快了对ATM技术的研究工作,并进行一系列宽带现场实验,目前ATM技术已逐渐成熟并进入商用阶段。在我国的部分地区已经建立ATM局域网和开展VOD试验,预计ATM网络技术也会在广电网的接入网占有主导地位。由广电部和陕西省政府联合建设的杨凌广播电视信息网局域骨干网就准备 From the early nineties, major domestic and foreign telecom companies invested huge sums of money to speed up the research on ATM technology, and conducted a series of broadband field experiments. At present, the ATM technology has gradually matured and entered the commercial stage. In some areas in our country, ATM LANs and VOD tests have been set up. It is estimated that ATM network technology will also dominate the access network of Guangdian Network. Yangling radio and television information network by the radio and television departments and Shaanxi Provincial Government jointly build the backbone network to prepare