本文档根据参考文献[1]交叉支持参考模型-第1部分:SLE服务中指定的传输服务定义了转发空间分组(FSP)服务。FSP服务是一种空间链路扩展（SLE）传输服务，使任务能够以顺序控制或加速模式向航天器发送空间数据包。 本文档以抽象的方式从以下方面定义了FSP服务: 提供转移服务所需的操作； 与每个操作相关联的参数数据； 调用每个操作所产生的行为；和 操作和结果行为之间的关系和有效序列。 它没有具体说明: 单个实现或产品； 实体或接口在真实系统中的实现；向航天器辐射空间分组和从从该航天器接收的信号中获取遥测帧以提取操作控制场所需的方法或技术； 通信所需的方法或技术；或 调度、配置和控制FSP服务所需的管理活动。 笔记？–？虽然参考文献[1]中描述的FSP服务被设想为处理各种分组数据结构，但是该版本的FSP推荐标准被限制为处理如参考文献[6]中定义的空间分组。 该版本的FSP推荐标准专门用于通过参考文献[3]、[4]和[5]中定义的远程命令协议栈传输的空间分组的传输。交叉支持参考模型（参考文献[1]）规定，FSP服务也可以与高级轨道系统协议栈结合使用，但该操作模式超出了测试的范围他的推荐标准版本。 FSP服务以在线交付模式提供，如参考文献[1]中所定义。？线下交付模式是进一步研究的主题。

This document defines the Forward Space Packet (FSP) service in conformance with the transfer services specified in reference [1], Cross Support Reference Model―Part 1: SLE Services. The FSP service is a Space Link Extension (SLE) transfer service that enables a mission to send Space Packets to a spacecraft in sequence-controlled or expedited mode. This document defines, in an abstract manner, the FSP service in terms of:

1. the operations necessary to provide the transfer service;
2. the parameter data associated with each operation;
3. the behaviors that result from the invocation of each operation; and
4. the relationship between, and the valid sequence of, the operations and resulting behaviors.

It does not specify:

1. individual implementations or products;
2. the implementation of entities or interfaces within real systems;
3. the methods or technologies required to radiate Space Packets to a spacecraft and to acquire telemetry frames from the signals received from that spacecraft for extraction of the Operational Control Field;
4. the methods or technologies required for communications; or
5. the management activities necessary to schedule, configure, and control the FSP service.

NOTE？–？While the FSP service as described in reference [1] is conceived to handle a variety of packet data structures, this version of the FSP Recommended Standard is restricted to the handling of Space Packets as defined in reference [6]. This version of the FSP Recommended Standard is specific to the transfer of Space Packets to be transmitted via the Telecommand protocol stack as defined in references [3], [4], and [5]. The Cross Support Reference Model (reference [1]) specifies that the FSP service may also be used in conjunction with the Advanced Orbiting System protocol stack, but that mode of operation is outside the scope of this version of the Recommended Standard. The FSP service is provided in the online delivery mode, as defined in reference [1].？The offline delivery mode is the subject of further study.