标准编号：ISO 22671:2007
中文名称：空间数据和信息传输系统 空间链接扩展（SLE） 正向指令链接传递单元（CLTU）
英文名称：Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service
发布日期：2007-02
标准范围
This International Standard defines the communications link transmission unit (CLTU) service in conformancewith the transfer services specified in ISO 15396:1998. The forward CLTU service is a space link extension(SLE) transfer service that enables a mission to send communications link transmission units (CLTUs) to aspacecraft.This International Standard 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 fromthe 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.The scope and field of application are furthermore detailed in subclause 1.3 of the enclosed CCSDSpublication.
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