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ISO 22671:2021

Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service specification

Standard Details

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.

General Information

Status : Published
Standard Type: Main
Document No: ISO 22671:2021
Document Year: 2021
Pages: 143
Edition: 4
  • ICS:
  • 49.140 Space systems and operations

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ISO 22671:2021
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