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计算机系统性能的提高和LAN的广泛使用,促进了分布式处理技术的发展,也刺激了用户的需求,他们已不再满足本地资源的共享,而希望能在较大的区域内访问广泛分布的计算机资源。高速数据网的兴起,为高性能的分布式应用奠定了基础。90年代,城域网将首先向用户提供高速数据交换服务SMDS(Switched Multi-megabit Data Service),它具有每秒几百兆比特的速率和远程交换功能。高速数据网的崛起和网络新技术的出现,可促使克服局域网和广域网的局限性,形成了
The improvement of computer system performance and the extensive use of LAN have promoted the development of distributed processing technology and stimulated the users’ needs. They no longer satisfy the sharing of local resources, and they hope to access widely distributed Computer resources. The rise of high-speed data networks has laid the foundation for high-performance distributed applications. In the 90s, MAN will first provide subscribers with the Switched Multi-megabit Data Service (SMDS), which has a rate of several hundred Mbits per second and remote switching capabilities. The rise of high-speed data networks and the advent of new network technologies can prompt the overcoming of the limitations of LANs and WANs.