ISO 21460:2015定义了Proximity-1空间链路协议物理层。本文件定义了信道连接过程、频带和分配的提供、呼叫信道、极化、调制、数据速率和性能要求的规范。 目前，物理层仅为火星环境定义UHF频率下的操作。 数据链路层是在两个独立的CCSDS推荐标准中定义的，名为Proximity-1空间链路协议？编码和同步子层（参考文献[2]），以及Proximity-1空间链路协议？数据链路层（参考文献[3]）。 ISO 21460:2015未规定 a)单独的实现或产品； b)在真实系统内实现服务接口； 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 21460:2015 defines the Proximity-1 Space Link Protocol Physical Layer. The specification for the channel connection process, provision for frequency bands and assignments, hailing channel, polarization, modulation, data rates, and performance requirements are defined in this document. Currently, the Physical Layer only defines operations at UHF frequencies for the Mars environment. The Data Link Layer is defined in the two separate CCSDS Recommended Standards entitled, Proximity-1 Space Link Protocol?Coding and Synchronization Sublayer (reference [2]), and Proximity-1 Space Link Protocol?Data Link Layer (reference [3]). ISO 21460:2015 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.