ＯＤＩ是Ｎｅｔｗａｒｅ网络操作系统中的核心部分之一，它对下支持多种不同体系结构的协议栈，对上屏蔽各种不同厂商和类型的物理网板。本文介绍ＯＤＩ中的链路支持层ＬＳＬ所提供的对上、对下接口函数。使用这些函数，开发人员可将自己开发的网板及其驱动程序加入Ｎｅｔｗａｒｅ系统。而且，开发人员还可使用这些函数将新的高层协议加入Ｎｅｔｗａｒｅ系统，从而使用户的Ｎｅｔｗａｒｅ网络系统具有更强大的应用功能。 ODI is one of the core parts of the Netware network operating system. It supports multiple protocol stacks with different architectures and shields various types of physical network boards from different vendors. This article describes the upper and lower interface functions provided by the link support layer LSL in ODI. Using these functions, developers can add their own development boards and their drivers to the Netware system. Moreover, developers can also use these functions to add new high-level protocols to the Netware system, giving users more powerful application capabilities for their Netware network systems.