ISO 22663:2015定义了数据链路层（帧、介质访问控制、数据服务和输入/输出[I/O]子层）。本文件定义了协议数据单元、帧、媒体访问控制、快速和顺序控制数据传输、定时服务、I/O控制的规范，以及在呼叫者和应答者之间建立和终止会话的程序。编码和同步子层在单独的CCSDS推荐标准《接近-1空间链路协议》中定义？编码和同步子层（参考文献[5]）。 物理层在单独的CCSDS推荐标准《接近-1空间链路协议》中定义？物理层（参考文献[6]）。 ISO 22663:2015未规定a）单个实现或产品，b）实际系统中服务接口的实现，c）执行程序所需的方法或技术，或d）配置和控制协议所需的管理活动。

ISO 22663:2015 defines the Data Link Layer (Framing, Medium Access Control, Data Services, and Input/Output [I/O] Sublayers). The specifications for the protocol data units, framing, media access control, expedited and sequenced-controlled data transfer, timing service, I/O control, and the procedures for establishing and terminating a session between a caller and responder are defined in this document. The Coding and Synchronization Sublayer is defined in the separate CCSDS Recommended Standard entitled, Proximity-1 Space Link Protocol?Coding and Synchronization Sublayer (reference [5]). The Physical Layer is defined in the separate CCSDS Recommended Standard entitled, Proximity-1 Space Link Protocol?Physical Layer (reference [6]). ISO 22663:2015 does not specify a) individual implementations or products, b) implementation of service interfaces within real systems, c) the methods or technologies required to perform the procedures, or d) the management activities required to configure and control the protocol.