1适用范围和领域本国际标准根据（a）服务的原始动作和事件定义OSI网络服务；（b） 与每个基本动作和事件相关的参数，以及它们所采用的形式；（c） 这些行为和事件之间的相互关系和有效顺序。本国际标准的主要目标是（a）规定概念性网络服务的特征，从而补充指导开发人员的参考模型

1 Scope and Field of Application This International Standard defines the OSI Network Service in terms of (a) the primitive actions and events of the Service; (b) the parameters associated with each primitive action and event, and the form which they take; (c) the interrelationship between, and the valid sequences of, these actions and events. The principal objectives of this International Standard are (a) to specify the characteristics of a conceptual Network Service and thus supplement the Reference Model in guiding the developmen