CCSDS文件交付协议（CFDP？参考文献[1]）旨在支持各种任务场景中的文件传输。CFDP提供从尽力而为到完全可靠的不同服务质量，并针对长延迟、嘈杂和不相交的链路进行了专门优化。CFDP需要来自底层协议的一个简单的最小服务，在提供分组通信服务的任何链路上运行。 ISO 20105:2015规定了如何通过CCSDS封装服务（参考文献[2]）操作CFDP，该服务适用于地对航天器、航天器对地和航天器对航天器通信。它列出了通过封装服务运行的CFDP的通信体系结构。它描述了底层CFDP所期望的服务，并将其与封装服务提供的服务相协调。

The CCSDS File Delivery Protocol (CFDP?reference [1]) has been designed to support the transfer of files in a variety of mission scenarios. CFDP offers different qualities of service ranging from best effort to fully reliable and has been specifically optimized for long delay, noisy, and disjoint links. CFDP requires a simple minimum service from the underlying protocols, operating over any link providing a packet communication service. ISO 20105:2015 is to specify how to operate CFDP over the CCSDS Encapsulation Service (reference [2]) as provided for Earth-to-spacecraft, spacecraft-to-Earth, and spacecraft-to-spacecraft communications. It sets out the communications architecture for CFDP operating over the Encapsulation Service. It describes the service expected by CFDP of the underlying layers and reconciles this with the service provided by the Encapsulation Service.