标准摘要
[中文适用范围]： 本推荐标准定义了SLE协议数据单元（PDU）在SLE用户系统和SLE提供者系统之间传输的协议，包括：a) 建立和释放关联的方法；b) 建立关联后交换的消息；c) 监控数据通信连接状态的方法；d) 确保数据在不同平台和格式之间转换的方法。本推荐标准不涉及：a) 个体设计、实现或产品；b) 数据通信基础设施的配置，包括TCP和IP协议的配置；c) 地址（IP地址和TCP端口号）的协商、分配和通信方法。 [外文原描述]： ISO 18440:2016 defines a protocol for transfer of SLE PDUs between an SLE user and an SLE provider system in terms of: a) the procedures used to establish and release associations; b) the messages exchanged on an established association; c) the procedures used to monitor the status of data communication connections; and d) the methods used to ensure that data are converted between different formats and representations on different platforms. It does not specify: a) individual designs, implementations, or products; b) the configuration of the data communications infrastructure, including configuration of the TCP and IP protocols; c) the means by which addresses (IP addresses and TCP port numbers) are agreed, assigned and communicated.
英文名称Space data and information transfer systems — Space link extension — Internet protocol for transfer services