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90年代以来,计算机应用普遍地从各个单项应用向综合应用扩展,经历着从单机应用向网络应用的发展历程。 通信网可粗分为两大部分:主干网和接入网。大家对主干网大多比较熟悉,因为已有大量的关于国内外主干网(国家或部门行业范围)的介绍。国家范围的主干网通常是光纤通信(大容量)和卫星网(大范围,无距离概念)优势的综合体。尤其在我国,地域辽阔且各地经济发展极不平衡,边远省份宜多用卫星通信与内地沟通,大、中城市则宜多用光纤通信网互
Since the 90s, computer applications have generally expanded from individual applications to comprehensive applications and experienced the development from single application to network application. Communication network can be roughly divided into two major parts: the backbone network and access network. Most of you are familiar with the backbone network, because there are a lot of on the domestic and international backbone network (country or sector range) introduction. National-wide backbones are often a combination of the advantages of fiber-optic communications (large capacity) and satellite networks (large-area, distanceless concepts). Especially in our country, the territory is vast and the economic development across the country is extremely unbalanced. Remote provinces should use the satellite communications to communicate with the Mainland more and more. The large and medium-sized cities should use optical fiber communication networks