1、 Standard ANSI/AIAA S-123-2007 Adaptations and Conversions of CCSDS Space Link Extension Forward Communications Link Transmission Unit Transfer Service AIAA standards are copyrighted by the American Institute of Aeronautics and Astronautics (AIAA), 1801 Alexander Bell Drive, Reston, VA 20191-4344 US
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3、be reproduced in any way. In addition, the electronic file may not be distributed elsewhere over computer networks or otherwise. The hard copy print may only be distributed to other employees for their internal use within your organization. ANSI/AIAA S-123-2007 American National Standard Adaptations
4、 and Conversions of CCSDS Space Link Extension Forward Communications Link Transmission Unit Transfer Service Sponsored by American Institute of Aeronautics and Astronautics Approved 3 May 2007 American National Standards Institute Abstract This document defines adaptations and conversions of the Co
5、nsultative Committee for Space Data Systems (CCSDS)-standard SLE Forward Communications Link Transmission Unit (FCLTU) command transfer service. The CCSDS SLE transfer services do not support some legacy command and telemetry data flows that must be accommodated by US civil, military, and commercial
6、 space element tracking, telemetry, and control networks to allow interoperability in support of US Government space operations. Adaptations of FCLTU by the user and conversions of FCLTU by the provider provide standardized discrete and streaming ternary command services and streaming binary command
7、 services which are not otherwise provided by CCSDS SLE transfer services. Discrete and streaming mode ternary command services support space elements which use ternary commanding on the space link. Streaming binary command services support space elements whose commands are not discrete or otherwise
8、 do not have discernible command boundaries. ANSI/AIAA S-123-2007 ii Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria have been met by the standards developer. Consensus is established when, in the judgment o
9、f the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerte
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14、 Standards Institute. Library of Congress Cataloging-in-Publication Data American national standard - Adaptations and conversions of CCSDS space link extension forward communications link transmission unit transfer service. p. cm. Includes bibliographical references. ISBN 978-1-56347-922-9 (hardcopy
15、) - ISBN 978-1-56347-923-6 (electronic) 1. Artificial satellites in telecommunication-Standards-United States. 2. Data transmission systems-Standards-United States. I. American Institute of Aeronautics and Astronautics. II. American National Standards Institute. TK5104.D73 2007 621.3825-dc22 2007017
16、956 Published by American Institute of Aeronautics and Astronautics 1801 Alexander Bell Drive, Reston, VA 20191 Copyright 2007 American Institute of Aeronautics and Astronautics All rights reserved No part of this publication may be reproduced in any form, in an electronic retrieval system or otherw
17、ise, without prior written permission of the publisher. Printed in the United States of America American National Standard ANSI/AIAA S-123-2007 iii Contents Foreword.v Introduction vi 1 Scope 1 2 Tailoring 1 3 Applicable Documents . 1 4 Vocabulary 1 4.1 Acronyms and Abbreviated Terms 1 4.2 Terms and
18、 Definitions 2 4.3 Nomenclature . 3 4.4 Conventions 3 4.4.1 Bit numbering convention 3 4.4.2 Typographic conventions. 4 5 Summary of Functions . 4 5.1 CLTU Adaptation Functions Performed by the Service User 4 5.1.1 CLTU-Transfer-Data Invocation Function. 6 5.1.2 Discrete Ternary Block Command Extrac
19、tion Function . 6 5.1.3 Continuous Ternary Command Stream Segmentation Function. 6 5.1.4 Ternary Symbol to Dibit Translation Function. 7 5.1.5 Continuous Binary Command Stream Segmentation Function . 7 5.1.6 FCLTU Transfer Service Automatic Restart Function 7 5.2 CLTU Conversion Functions Performed
20、by the Service Provider . 7 5.2.1 Ternary Dibit to Symbol Translation Function. 7 5.2.2 Ternary Physical Layer Operation Procedures (PLOPs) . 7 6 Supported Data Flows 8 6.1 Ternary-formatted commands transferred as discrete block commands 8 6.2 Ternary-formatted commands transferred as a continuous
21、symbol stream . 10 6.3 Binary-formatted commands transferred as a continuous bitstream. 10 7 Deviation from Normal CCSDS SLE FCLTU Service. 13 7.1 CLTU-START . 13 7.2 CLTU-STOP . 13 7.3 CLTU-TRANSFER-DATA 13 7.4 CLTU-ASYNC-NOTIFY 13 7.5 CLTU-STATUS-REPORT 13 7.6 CLTU-GET-PARAMETER . 14 8 FCLTU Adapt
22、ation Functions Performed by the Service User 14 ANSI/AIAA S-123-2007 iv 8.1 CLTU-Transfer-Data Invocation Function. 14 8.2 Discrete Ternary Block Command Extraction Function . 15 8.3 Continuous Ternary Command Stream Segmentation Function. 16 8.4 Ternary Symbol to Dibit Translation Function. 16 8.5
23、 Continuous Binary Command Stream Segmentation Function . 16 8.6 FCLTU Transfer Service Automatic Restart Function 16 9 CLTU Conversion Functions Performed by the Service Provider . 17 9.1 Ternary Dibit to Symbol Translation Function. 17 9.2 Ternary Physical Layer Operation Procedures (PLOPs) . 17 A
24、nnex A Informative References 19 Figures Figure 1 Bit Numbering Convention 3 Figure 2 Context of the FCLTU Conversion and Adaptation Functions 5 Figure 3 FCLTU Conversion and Adaptation Functions Supporting the Transfer of Ternary-Formatted Commands as Discrete Block Commands 9 Figure 4 FCLTU Conver
25、sion and Adaptation Functions Supporting the Transfer of Ternary-Formatted Commands as a Continuous Symbol Stream . 11 Figure 5 FCLTU Conversion and Adaptation Functions Supporting the Transfer of Binary Commands as a Continuous Bitsteam 12 Tables Table 1 Mapping between Ternary Symbols and Ternary
26、Dibits 16 ANSI/AIAA S-123-2007 v Foreword This standard was prepared by the AIAA Satellite Control Network Data Transfer Committee on Standards (CoS). The CoS was formed in 2005 to consider standardization of data transfer services relevant to the interoperation of US civil, military, and commercial
27、 telemetry, tracking, and control (TT and the other as a dibit symbol value. a) When or before production status transitions to operational, idle symbols shall be output to the RF and modulation equipment until a command segment is received in a CLTU-TRANSFER-DATA invocation, where the idle symbol i
28、s specified by the PLOP that is in effect, as configured via a managed parameter: 1) When ternary PLOP 1 is in effect, the idle symbol shall be the null symbol. 2) When ternary PLOP 2 is in effect, the idle symbol shall be the S symbol. b) For each CLTU-TRANSFER-DATA invocation with non-null earlies
29、t-radiation-time parameter value, the first symbol in the contained command segment shall be output to the RF and modulation equipment within one (1) symbol period or an implementation-specific amount of time (e.g., five (5) milliseconds) (whichever is greater) of the time specified in the earliest-
30、radiation-time parameter of the CLTU-TRANSFER-DATA invocation. ANSI/AIAA S-123-2007 18 c) For each CLTU-TRANSFER-DATA invocation with earliest-radiation-time parameter value of null, the first symbol in the contained command segment shall be output to the RF and modulation equipment within one (1) s
31、ymbol period of (a) the time of receipt of the command segment in the previous CLTU-TRANSFER-DATA invocation (b) the output time of the last symbol of the previous segment, or (c) the whichever is later. d) If no command segment is available for transmission immediately following the transmission of
32、 a symbol from a command segment, idle symbols for the ternary PLOP in effect shall be output to the RF and modulation equipment. e) The symbols shall be output to the RF and modulation equipment at a symbol rate configured via a command symbol rate managed parameter. ANSI/AIAA S-123-2007 19 Annex A
33、 Informative References CCSDS 910.3-G-2 Cross Support Concept Part 1: Space Link Extension Services. Report Concerning Space Data Systems Standards. Green Book. Issue 2. April 2002 CCSDS 910.4-B-1 Cross Support Reference ModelPart 1: Space Link Extension Services. Blue Book. Issue 2. Washington, D.C
34、.: CCSDS, October 2005 CCSDS 913.1-R-1 Space Link Extension Internet Protocol for Transfer Services. Draft recommended standard, Red Book. Washington, D.C.: CCSDS, October 2005. American Institute of Aeronautics and Astronautics 1801 Alexander Bell Drive, Suite 500 Reston, VA 20191-4344 www.aiaa.org ISBN 978-1-56347-923-6
