Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service specification
空间数据和信息传输系统.空间链路扩展（SLE）.前向通信链路传输单元（CLTU）服务规范
This document defines the Communications Link Transmission Unit (CLTU) service in conformance with the transfer services specified in reference [1], Cross Support Reference Model—Part 1: SLE Services.？ The Forward CLTU service is a Space Link Extension (SLE) transfer service that enables a mission to send Communications Link Transmission Units (CLTUs) to a spacecraft.
This document defines, in an abstract manner, the Forward CLTU service in terms of:
the operations necessary to provide the transfer service;
the parameter data associated with each operation;
the behaviors that result from the invocation of each operation; and
the relationship between, and the valid sequence of, the operations and resulting behaviors.
It does not specify:
individual implementations or products;
the implementation of entities or interfaces within real systems;
the methods or technologies required to radiate data to a spacecraft and to acquire telemetry frames from the signals received from that spacecraft for extraction of the Operational Control Field;
the methods or technologies required for communications; or
the management activities necessary to schedule, configure, and control the Forward CLTU service.
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