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这份材料是在1983年参观了加拿大温哥华数据交换中心(DATAPAC网络中的一个节点)之后写的调查报告。文中大部分内容来源于网络用户手册和商业性广告资料,有的内容是根据笔者与网络管理人员的交谈内容整理的,也有部分内容是综合了公开发表的有关文章而写成的。DATAPAC是在1976年建成投入使用的全国性公用分组数据交换网。网络的各级接口规程和协议,基本上与CCITT建汉的国际标准相兼容。因此该网络在国内为用户提供了范围广泛、费用合理、接口方便的众多服务项目,在国际上已与许多国家的公用数据网互联,提供国际性服务。内容包括如下七部分一、概述二、网络拓扑结构与通信干线;三、用户访网服务规范;四、用户访网接口及标准访网规程;五、网络控制中心;六、网络的国际性服务;七、结语。本材料的内容对于从事数据通信尤其是从事通信网络开发工作的业务和管理人员,很有参考价值。通过一个典型网络例,可以了解到有关网络开发、特点和大量技术方面的实际经验。一九八三年十二月
The material was surveyed in 1983 after visiting the Vancouver-Canada Data Exchange (a node in the DATAPAC network). Most of the content from the Internet user manual and commercial advertising materials, some content is based on the author and the network manager to talk about the contents of the order, there are some content is integrated published articles published. DATAPAC is a national public packet data exchange network put into operation in 1976. Network interface at all levels of protocols and protocols, basically with CCITT Jianhan compatible international standards. As a result, the network provides users with a wide range of services at reasonable cost and convenient interfaces in the country. It has been interconnected with public data networks in many countries and provides international services. The content includes the following seven parts First, an overview of two, the network topology and communication trunk; Third, the user access network service specifications; Fourth, the user access network interface and standard access rules; Five, network control center Sixth, the network of international services Seven, conclusion. The content of this material is of great reference value to the business and management personnel engaged in data communications, especially in the development of communication networks. Through a typical network example, you can learn about the network development, features and a large number of technical aspects of the actual experience. December 1983