SIS系统采用星形以太网网络结构，整个网络实 现了双网络冗余、双服务器冗余、双交换机冗余（如上页 图 1 所示）。SIS 网主要采用了分层分布式设计，整个 SIS 系统分为上下两层，下层为 SIS 接口层网络，采用独立接 口机连接各个独立控制系统进行数据采集。上层为 SIS 应 用层网络，连接 SIS 层历史服务器、计算站及各功能站。 通过分布式设计，一方面便于分散通讯负荷，提高各层通 讯效率和网络可靠性；另一方面也可以通过数据服务器进 行技术和通讯协议，上层技术选择强调开放性。而且在 技术实现上两层独立网络及 SIS 与 MIS 网既可通过物理 网络实现，又可以通过 VLAN（虚拟网络）实现。
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