信息技术 开放系统互连 表示服务定义

[中文适用范围]： 以抽象的方式定义了 OSI 表示层根据用户/服务边界处的原语动作和事件、与每个原语动作和事件关联的参数数据、它们之间的关系以及有效序列来提供的外部可见服务。 ，那些行动和事件。 所定义的服务是由OSI面向连接表示协议提供的面向连接服务和由OSI无连接表示协议提供的无连接服务，每个服务都与OSI会话服务结合。 [外文原描述]： Defines in an abstract way the externally visible service provided by the OSI presentation layer in terms of the primitive actions and events at the user/service boundary, the parameter data associated with each primitive action and event, the relationship between, and the valid sequences of, those actions and events. The service defined is the connection-oriented service which is provided by the OSI connection-oriented presentation protocol and the connectionless service which is provided by the OSI connectionless presentation protocol, each in conjunction with the OSI session service.