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INTERNATIONAL STANDARD ISO 22641 Second edition 2012-07-15 Space data and information transfer systems — TM (telemetry) synchronization and channel coding Systèmes de transfert des informations et données spatiales — Synchronisation TM (télémesure) et codage de canal `,,```,,,,````-`-`,,`,,`,`,,` - Reference number ISO 22641:2012(E) Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 Not for Resale COPYRIGHT PROTECTED DOCUMENT © ISO 2012 All rights reserved Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved Not for Resale `,,```,,,,````-`-`,,`,,`,`,,` - ISO 22641:2012(E) ISO 22641:2012(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work of preparing International Standards is normally carried out through ISO technical committees Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part The main task of technical committees is to prepare International Standards Draft International Standards adopted by the technical committees are circulated to the member bodies for voting Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights ISO shall not be held responsible for identifying any or all such patent rights ISO 22641 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as CCSDS 131.0-B-2, August 2011) and was adopted (without modifications except those stated in Clause of this International Standard) by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 13, Space data and information transfer systems `,,```,,,,````-`-`,,`,,`,`,,` - This second edition cancels and replaces the first edition (ISO 22641:2005), which has been technically revised © ISO for 2012 – All rights reserved Copyright International Organization Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS iii Not for Resale `,,```,,,,````-`-`,,`,,`,`,,` - Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 22641:2012(E) Space data and information transfer systems — TM (telemetry) synchronization and channel coding Scope 1.1 This International Standard specifies synchronization and channel coding schemes for use with the TM Space Data Link Protocol (according to ISO 22645:2005) or the AOS Space Data Link Protocol (according to ISO 22666:2007), which are intended to be used over space-to-ground or space-to-space communications links by space missions 1.2 This International Standard defines synchronization and channel coding schemes in terms of a) the services provided to the users of this specification, b) data formats, and c) the procedures performed to generate and process the data formats 1.3 This International Standard does not specify a) individual implementations or products, b) the methods or technologies required to perform the procedures, or c) the management activities required to configure and control the system 1.4 The scope and field of application are furthermore detailed in subclauses 1.2 and 1.3 of the enclosed CCSDS publication `,,```,,,,````-`-`,,`,,`,`,,` - Requirements Requirements are the technical recommendations made in the following publication (reproduced on the following pages), which is adopted as an International Standard: CCSDS 131.0-B-2, August 2011, TM synchronization and channel coding For the purposes of international standardization, the modifications outlined below shall apply to the specific clauses and paragraphs of publication CCSDS 131.0-B-2 Pages i to v This part is information which is relevant to the CCSDS publication only © ISO for 2012 – All rights reserved Copyright International Organization Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Not for Resale ISO 22641:2012(E) Page 1-5 Add the following information to the reference indicated: [1] Document CCSDS 132.0-B-1, September 2003, is equivalent to ISO 22645:2005 [2] Document CCSDS 732.0-B-2, July 2006, is equivalent to ISO 22666:2007 Page E-1 Add the following information to the reference indicated: [E2] Document CCSDS 101.0-B-6, October 2002, is equivalent to ISO 11754:2003 1) Revision of publication CCSDS 131.0-B-2 `,,```,,,,````-`-`,,`,,`,`,,` - It has been agreed with the Consultative Committee for Space Data Systems that Subcommittee ISO/TC 20/SC 13 will be consulted in the event of any revision or amendment of publication CCSDS 131.0-B-2 To this end, NASA will act as a liaison body between CCSDS and ISO 1) Withdrawn Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved Not for Resale ISO 22641:2012(E) Recommendation for Space Data System Standards `,,```,,,,````-`-`,,`,,`,`,,` - TM SYNCHRONIZATION AND CHANNEL CODING RECOMMENDED STANDARD CCSDS 131.0-B-2 BLUE BOOK August 2011 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved Not for Resale `,,```,,,,````-`-`,,`,,`,`,,` - Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Not for Resale ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING AUTHORITY Issue: Date: Location: Recommended Standard, Issue August 2011 Washington, DC, USA This document has been approved for publication by the Management Council of the Consultative Committee for Space Data Systems (CCSDS) and represents the consensus technical agreement of the participating CCSDS Member Agencies The procedure for review and authorization of CCSDS documents is detailed in the Procedures Manual for the Consultative Committee for Space Data Systems, and the record of Agency participation in the authorization of this document can be obtained from the CCSDS Secretariat at the address below This document is published and maintained by: CCSDS Secretariat Space Communications and Navigation Office, 7L70 Space Operations Mission Directorate NASA Headquarters Washington, DC 20546-0001, USA CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved `,,```,,,,````-`-`,,`,,`,`,,` - Page i Not for Resale August 2011 ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING STATEMENT OF INTENT The Consultative Committee for Space Data Systems (CCSDS) is an organization officially established by the management of its members The Committee meets periodically to address data systems problems that are common to all participants, and to formulate sound technical solutions to these problems Inasmuch as participation in the CCSDS is completely voluntary, the results of Committee actions are termed Recommended Standards and are not considered binding on any Agency This Recommended Standard is issued by, and represents the consensus of, the CCSDS members Endorsement of this Recommendation is entirely voluntary Endorsement, however, indicates the following understandings: o Whenever a member establishes a CCSDS-related standard, this standard will be in accord with the relevant Recommended Standard Establishing such a standard does not preclude other provisions which a member may develop o Whenever a member establishes a CCSDS-related standard, that member will provide other CCSDS members with the following information: The standard itself The anticipated date of initial operational capability The anticipated duration of operational service o Specific service arrangements shall be made via memoranda of agreement Neither this Recommended Standard nor any ensuing standard is a substitute for a memorandum of agreement No later than five years from its date of issuance, this Recommended Standard will be reviewed by the CCSDS to determine whether it should: (1) remain in effect without change; (2) be changed to reflect the impact of new technologies, new requirements, or new directions; or (3) be retired or canceled In those instances when a new version of a Recommended Standard is issued, existing CCSDS-related member standards and implementations are not negated or deemed to be nonCCSDS compatible It is the responsibility of each member to determine when such standards or implementations are to be modified Each member is, however, strongly encouraged to direct planning for its new standards and implementations towards the later version of the Recommended Standard `,,```,,,,````-`-`,,`,,`,`,,` - CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Page ii Not for Resale August 2011 © ISO 2012 – All rights reserved ISO 22641:2012(E) (Blank Page) `,,```,,,,````-`-`,,`,,`,`,,` - Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS 94 Not for Resale © ISO 2012 – All rights reserved ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING ANNEX F TRANSFORMATION BETWEEN BERLEKAMP AND CONVENTIONAL REPRESENTATIONS (INFORMATIVE) F1 PURPOSE This annex provides information to assist users of the Reed-Solomon code in this Recommended Standard to transform between the Berlekamp (dual basis) and Conventional representations In addition, it shows where transformations are made to allow a conventional encoder to produce the dual basis representation on which this Recommended Standard is based F2 TRANSFORMATION Referring to figure F-1, it can be seen that information symbols I entering and check symbols C emanating from the Berlekamp R-S encoder are interpreted as [z0, z1, , z7] where the components zi are coefficients of li, respectively: z0l0 + z1l1 + + z7l7 Information symbols I ' entering and check symbols C ' emanating from the conventional R-S encoder are interpreted as [u7, u6, , u0] where the components uj are coefficients of j, respectively: u77 + u66 + + u0 `,,```,,,,````-`-`,,`,,`,`,,` - A pre- and post-transformation is required when employing a conventional R-S encoder CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved Page F-1 Not for Resale August 2011 95 ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING I C BERLEKAMP R-S ENCODER C T -1 T I' CONVENTIONAL R-S ENCODER C' Figure F-1: Transformational Equivalence Conventional and Berlekamp types of (255,k) Reed-Solomon encoders are assumed to have the same self-reciprocal generator polynomial whose coefficients appear in 4.3.3 and 4.3.4 The representation of symbols associated with the conventional encoder is the polynomials in ‘’ appearing in table F-1 Corresponding to each polynomial in ‘’ is the representation in the dual basis of symbols associated with the Berlekamp type encoder Given i = u77 + u66 + + u0 where i < 255 (and * denotes the zero polynomial, u7, u6, = 0, 0, ), the corresponding element is z = z0l0 + z1l1 + + z7l7 where [z0, z1, , z7] = [u7, u6, , u0] T l and T = 1 1 1 0 1 0 1 1 1 0 0 1 1 1 1 1 1 1 0 0 1 1 1 0 1 Row 1, row 2, , and row in T l are representations in the dual basis of 7 (10 0), 6 (010 0), , and 0 (00 01), respectively CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS 96 `,,```,,,,````-`-`,,`,,`,`,,` - Page F-2 Not for Resale August 2011 © ISO 2012 – All rights reserved ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING The inverse of T l is T -1 0 1 1 = 1 1 1 0 1 1 0 0 1 0 0 1 1 1 1 0 1 1 0 0 0 1 0 -1 Row 1, row 2, , and row in T l are polynomials in ‘’ corresponding to l0 (10 0), l1 (010 0), , and l7 (00, 01), respectively -1 [z0, z1, , z7 ] T l Thus, = [u7, u6, , u0] Example 1: Given information symbol I, [z0, z1, , z7] = 10111001 then [1 1 0 1] 0 1 1 1 1 1 0 1 1 0 0 1 0 -1 0 1 1 1 1 0 1 1 0 0 0 1 0 = [u7, u6, , u0] = 00101010 = I' `,,```,,,,````-`-`,,`,,`,`,,` - T The arithmetic operations are reduced modulo Also, [z0, z1, , z7] = 10111001 and [u7, u6, , u0] = 00101010 (213) are corresponding entries in table F-1 CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved Page F-3 Not for Resale August 2011 97 ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING Example 2: Given check symbol C ', [7, 6, , 0] = 01011001 (152) Then, [0 1 0 1] 1 1 1 0 1 0 1 1 1 0 0 1 1 1 1 1 1 1 0 0 1 1 1 0 1 = [z 0, z 1, , z 7] = 11101000 = C `,,```,,,,````-`-`,,`,,`,`,,` - CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS 98 Page F-4 Not for Resale August 2011 © ISO 2012 – All rights reserved ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING Table F-1: Equivalence of Representations1 P O W E R POLY IN ALPHA P O W E R l01234567 =================== ============= `,,```,,,,````-`-`,,`,,`,`,,` - * 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 00000000 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000 10000111 10001001 10010101 10101101 11011101 00111101 01111010 11110100 01101111 11011110 00111011 01110110 11101100 01011111 10111110 11111011 01110001 11100010 01000011 10000110 10001011 10010001 10100101 POLY IN ALPHA l01234567 =================== ============= 00000000 01111011 10101111 10011001 11111010 10000110 11101100 11101111 10001101 11000000 00001100 11101001 01111001 11111100 01110010 11010000 10010001 10110100 00101000 01000100 10110011 11101101 11011110 00101011 00100110 11111110 00100001 00111011 10111011 10100011 01110000 10000011 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 11001101 00011101 00111010 01110100 11101000 01010111 10101110 11011011 00110001 01100010 11000100 00001111 00011110 00111100 01111000 11110000 01100111 11001110 00011011 00110110 01101100 11011000 00110111 01101110 11011100 00111111 01111110 11111100 01111111 11111110 01111011 11110110 01111010 10011110 00111111 00011100 01110100 00100100 10101101 11001010 00010001 10101100 11111011 10110111 01001010 00001001 01111111 00001000 01001110 10101110 10101000 01011100 01100000 00011110 00100111 11001111 10000111 11011101 01001001 01101011 00110010 11000100 10101011 00111110 From table of reference [E4] Note: Coefficients of the ‘Polynomial in Alpha’ column are listed in descending powers of , starting with 7 CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved Page F-5 Not for Resale August 2011 99 ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING Table F-1: Equivalence of Representations (continued) P O W E R POLY IN ALPHA P O W E R l01234567 =================== ============= 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 01101011 11010110 00101011 01010110 10101100 11011111 00111001 01110010 11100100 01001111 10011110 10111011 11110001 01100101 11001010 00010011 00100110 01001100 10011000 10110111 11101001 01010101 10101010 11010011 00100001 01000010 10000100 10001111 10011001 10110101 11101101 01011101 `,,```,,,,````-`-`,,`,,`,`,,` - CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS 100 POLY IN ALPHA l01234567 =================== ============= 00101101 11010010 11000010 01011111 00000010 01010011 11101011 00101010 00010111 01011000 11000111 11001001 01110011 11100001 00110111 01010010 11011010 10001100 11110001 10101010 00001111 10001011 00110100 00110000 10010111 01000000 00010100 00111010 10001010 00000101 10010110 01110001 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 Page F-6 Not for Resale 10111010 11110011 01100001 11000010 00000011 00000110 00001100 00011000 00110000 01100000 11000000 00000111 00001110 00011100 00111000 01110000 11100000 01000111 10001110 10011011 10110001 11100101 01001101 10011010 10110011 11100001 01000101 10001010 10010011 10100001 11000101 00001101 10110010 11011100 01111000 11001101 11010100 00110110 01100011 01111100 01101010 00000011 01100010 01001101 11001100 11100101 10010000 10000101 10001110 10100010 01000001 00100101 10011100 01101100 11110111 01011110 00110011 11110101 00001101 11011000 11011111 00011010 10000000 00011000 August 2011 © ISO 2012 – All rights reserved ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING Table F-1: Equivalence of Representations (continued) POLY IN ALPHA P O W E R l01234567 =================== ============= 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 00011010 00110100 01101000 11010000 00100111 01001110 10011100 10111111 11111001 01110101 11101010 01010011 10100110 11001011 00010001 00100010 01000100 10001000 10010111 10101001 11010101 00101101 01011010 10110100 11101111 01011001 10110010 11100011 01000001 10000010 10000011 10000001 CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved POLY IN ALPHA l01234567 =================== ============= 11010011 11110011 11111001 11100100 10100001 00100011 01101000 01010000 10001001 01100111 11011011 10111101 01010111 01001100 11111101 01000011 01110110 01110111 01000110 11100000 00000110 11110100 00111100 01111110 00111001 11101000 01001000 01011010 10010100 00100010 01011001 11110110 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 Page F-7 Not for Resale 10000101 10001101 10011101 10111101 11111101 01111101 11111010 01110011 11100110 01001011 10010110 10101011 11010001 00100101 01001010 10010100 10101111 11011001 00110101 01101010 11010100 00101111 01011110 10111100 11111111 01111001 11110010 01100011 11000110 00001011 00010110 00101100 01101111 10010101 00010011 11111111 00010000 10011101 01011101 01010001 10111000 11000001 00111101 01001111 10011111 00001110 10111010 10010010 11010110 01100101 10001000 01010110 01111101 01011011 10100101 10000100 10111111 00000100 10100111 11010111 01010100 00101110 10110000 10001111 `,,```,,,,````-`-`,,`,,`,`,,` - P O W E R August 2011 101 ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING Table F-1: Equivalence of Representations (continued) POLY IN ALPHA P O W E R l01234567 =================== ============= 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 01011000 10110000 11100111 01001001 10010010 10100011 11000001 00000101 00001010 00010100 00101000 01010000 10100000 11000111 00001001 00010010 00100100 01001000 10010000 10100111 11001001 00010101 00101010 01010100 10101000 11010111 00101001 01010010 10100100 11001111 00011001 00110010 CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS 102 POLY IN ALPHA l01234567 =================== ============= 10010011 11100111 11000011 01101110 10100100 10110101 00011001 11100010 01010101 00011111 00010110 01101001 01100001 00101111 10000001 00101001 01110101 00010101 00001011 00101100 11100011 01100100 10111001 11110000 10011011 10101001 01101101 11000110 11111000 11010101 00000111 11000101 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 Page F-8 Not for Resale 01100100 11001000 00010111 00101110 01011100 10111000 11110111 01101001 11010010 00100011 01000110 10001100 10011111 10111001 11110101 01101101 11011010 00110011 01100110 11001100 00011111 00111110 01111100 11111000 01110111 11101110 01011011 10110110 11101011 01010001 10100010 11000011 10011010 10011000 11001011 00100000 00001010 00011101 01000101 10000010 01001011 00111000 11011001 11101110 10111100 01100110 11101010 00011011 10110001 10111110 00110101 00000001 00110001 10100110 11100110 11110010 11001000 01000010 01000111 11010001 10100000 00010010 11001110 10110110 August 2011 © ISO 2012 – All rights reserved `,,```,,,,````-`-`,,`,,`,`,,` - P O W E R ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING ANNEX G EXPANSION OF REED-SOLOMON COEFFICIENTS (INFORMATIVE) Purpose: While the equations given in the Reed-Solomon Coding section of this Recommended Standard are fully specifying, this annex provides additional assistance for those implementing either the E = 16 or the E = code For E = 16: COEFFICIENTS OF g(x) G0 G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 G13 G14 G15 = = = = = = = = = = = = = = = = G32 G31 G30 G29 G28 G27 G26 G25 G24 G23 G22 G21 G20 G19 G18 G17 G16 = = = = = = = = = = = = = = = = = 0 249 59 66 4 43 126 251 97 30 3 213 50 66 170 5 24 0 0 0 1 0 0 0 1 0 1 0 0 0 POLYNOMIAL IN 5 4 3 2 1 0 0 0 0 1 1 1 1 1 1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 1 0 0 1 0 0 1 1 0 1 1 0 1 0 1 1 0 0 1 NOTE – G3 = G29 = G13 = G19 Further information, including encoder block diagrams, is provided in reference [E4] `,,```,,,,````-`-`,,`,,`,`,,` - CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved Page G-1 Not for Resale August 2011 103 ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING For E = 8: COEFFICIENTS OF g(x) G0 = G16 = G1 = G15 = G2 = G14 = G3 = G13 = G4 = G12 = G5 = G11 = G6 = G10 = G7 = G9 = G8 = 0 30 230 49 235 129 81 76 173 POLYNOMIAL IN 5 4 3 2 1 0 `,,```,,,,````-`-`,,`,,`,`,,` - CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS 104 Page G-2 Not for Resale August 2011 © ISO 2012 – All rights reserved ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING ANNEX H CHANGES FROM REFERENCES [E2] AND [E3] (INFORMATIVE) H1 GENERAL `,,```,,,,````-`-`,,`,,`,`,,` - Part of this Recommended Standard was developed from the specifications regarding synchronization and channel coding in older CCSDS Recommended Standards (references [E2] and [E3]), but a few technical specifications in references [E2] and [E3] have been changed in order to define all Space Data Link Protocols in a unified way These technical changes are described in H2 Also, some technical terms in references [E2] and [E3] have been changed in order to unify the terminology used in all the CCSDS Recommended Standards that define space link protocols, as well as to define these schemes as general communications schemes These terminology changes are listed in H3 H2 TECHNICAL CHANGES H2.1 PARAMETERS ASSOCIATED WITH TRANSFER FRAME LENGTH In references [E2] and [E3], the periods during which the value of parameters are fixed are not consistently specified In this Recommended Standard, any parameter associated with the length of the Transfer Frame is fixed for a Mission Phase on a particular Physical Channel H2.2 TRANSFER FRAME LENGTHS The constraints on Virtual Channel Data Unit (VCDU) (AOS Transfer Frame) lengths specified in reference [E3] were different from those on TM Transfer Frame lengths specified in reference [E2] In this Recommended Standard, the same constraints are applied to both types of Transfer Frames H3 TERMINOLOGY CHANGES Tables H-1 and H-2 list the terms that have been changed from references [E2] and [E3], respectively CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS © ISO 2012 – All rights reserved Page H-1 Not for Resale August 2011 105 ISO 22641:2012(E) CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING Table H-1: Terms That Have Been Changed from Reference [E2] Terms Used in Reference [E2] Telemetry Transfer Frame Terms Used in This Recommended Standard TM Transfer Frame Table H-2: Terms That Have Been Changed from Reference [E3] Terms Used in Reference [E3] Terms Used in This Recommended Standard Channel Symbols Virtual Channel Data Unit (VCDU) AOS Transfer Frame `,,```,,,,````-`-`,,`,,`,`,,` - PCA_PDU CCSDS 131.0-B-2 Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS 106 Page H-2 Not for Resale August 2011 © ISO 2012 – All rights reserved `,,```,,,,````-`-`,,`,,`,`,,` - Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Not for Resale `,,```,,,,````-`-`,,`,,`,`,,` - ISO 22641:2012(E) ICS 49.140 Price based on 83 pages © ISO 2012 – Allforrights reserved Copyright International Organization Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Not for Resale
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