本标准规定了遥控空间数据链路的数据结构和协议以及物理层操作的过程。 通常，遥控空间数据链路上的数据源位于地面上，接收机位于空间中。然而，该标准也可用于空间到空间的遥控数据链路。 有关本标准适用的进一步规定和指导，可分别在以下文件中找到: - 更高层次的标准ECSS-E-ST-50'通信'，其定义了与空间通信（物理到应用层）相关的所有通信层的通信协议和相关业务的原理特征及其与每个其他。 - “ECSS-E-HB-50”通讯指南手册，提供有关这些协议的具体实施特征的信息，以便支持为空间任务的具体要求选择某种通信模式。 邀请本标准的用户在对本文件的执行情况作出决定前先征询这些文件。 该标准可以针对符合ECSS-S-ST-00的空间项目的具体特征和限制

This Standard specifies the data structures and protocols for a telecommand space data link and the procedure for physical layer operation. Usually, the source of data on a telecommand space data link is located on the ground and the receiver is located in space. However, the Standard may also be used for space-to-space telecommand data links. Further provisions and guidance on the application of this standard can be found, respectively, in the following documents: - The higher level standard ECSS-E-ST-50 'Communications', which defines the principle characteristics of communication protocols and related services for all communication layers relevant for space communication (physical- to application-layer), and their basic relationship to each other. - The handbook ECSS-E-HB-50 'Communications guidelines', which provides information about specific implementation characteristics of these protocols in order to support the choice of a certain communications profile for the specific requirements of a space mission. Users of this present standard are invited to consult these documents before taking decisions on the implementation of the present one. This standard may be tailored for the specific characteristics and constraints of a space project in conformance with ECSS-S-ST-00.