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  • ISO
    ISO 22671:2021 Space data and information transfer systems - Space link extension (SLE) - Forward communications link transmission unit (CLTU) service specification
    Edition: 2021
    $629.86
    / user per year

Content Description

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:

  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 data 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 Forward CLTU service.


About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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