摘要
主要介绍了ＩＢＭ的系统网络结构及其发展，从传统的子域（Ｓｕｂａｒｅａ）到ＡＰＰＮ，再到ＡＰＰＮ的新扩展ＨＰＲ．阐述了ＡＰＰＣ与ＡＰＰＮ的关系，主要分析了ＡＰＰＮ的三类网络结点和其功能及服务．
It presents the configration and development of IBM SNA from traditional SNA(Subarea) to APPN and its new extension-HPR.Relations between APPN and APPC,three type nodes of APPN and their functions and services are described.In addition,studies on HPR used in high speed links are also presented.
