1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 18426:2013Space data and informationtransfer systems SpacecraftOnboard Interface Services Subnetwork Memory AccessServiceBS ISO 18426:2013 BRITISH STANDARDNational forewor
2、dThis British Standard is the UK implementation of ISO 18426:2013.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/68/-/7, Space systems and operations - Space dataand information transfer systems.A list of organizations represented on this committee can beobtained on
3、request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 80291 1ICS 49.140Compliance with a British S
4、tandard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2013.Amendments issued since publicationDate Text affectedBS ISO 18426:2013Reference numberISO 18426:2013(E)ISO 2013INTERNATIONAL STAN
5、DARD ISO18426First edition2013-06-01Space data and information transfer systems Spacecraft Onboard Interface Services Subnetwork Memory Access Service Systmes de transfert des informations et donnes spatiales Services dinterfaces bord des vhicules spatiaux Service daccs la mmoire par sous-rseau BS I
6、SO 18426:2013ISO 18426:2013(E) COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an in
7、tranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs 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 copyrightiso.org Web www.iso.org
8、Published in Switzerland ii ISO 2013 All rights reservedBS ISO 18426:2013ISO 18426:2013(E) ISO 2013 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International
9、 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, a
10、lso take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1
11、. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives Attention is drawn to the possibility that some of the elements
12、of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. ww
13、w.iso.org/patents Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. ISO 18426 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as CCSDS 852.0-M-1, December 2009) and was adopted (without modificati
14、ons except those stated in Clause 2 of this International Standard) by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 13, Space data and information transfer systems. BS ISO 18426:2013BS ISO 18426:2013INTERNATIONAL STANDARD ISO 18426:2013(E) ISO 2013 All rights reserved
15、1Space data and information transfer systems Spacecraft Onboard Interface Services Subnetwork Memory Access Service 1 Scope This International Standard is one of a family of documents specifying the SOIS-compliant services to be provided by onboard subnetworks. The purpose of this International Stan
16、dard is to define services and service interfaces provided by the SOIS Subnetwork Memory Access Service. Its scope is to specify the service only and not to specify methods of providing the service over a variety of onboard data links. This International Standard conforms to the principles set out i
17、n the Spacecraft Onboard Interface Services Green Book and is intended to be applied together with it. The protocols which provide this service are to be documented for individual links, and this can be in the purview of individual missions, agencies, or CCSDS, depending on future circumstance. The
18、scope and field of application are furthermore detailed in subclause 1.2 of the enclosed CCSDS publication. 2 Requirements Requirements are the technical recommendations made in the following publication (reproduced on the following pages), which is adopted as an International Standard: CCSDS 852.0-
19、M-1, December 2009, Spacecraft Onboard Interface Services Subnetwork Memory Access Service. For the purposes of international standardization, the modifications outlined below shall apply to the specific clauses and paragraphs of publication CCSDS 852.0-M-1. Pages i to v This part is information whi
20、ch is relevant to the CCSDS publication only. 3 Revision of publication CCSDS 852.0-M-1 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 852.0-M-1. To this end,
21、 NASA will act as a liaison body between CCSDS and ISO. BS ISO 18426:2013ISO 18426:2013(E) 2 ISO 2013 All rights reserved(Blank page) BS ISO 18426:2013Recommendation for Space Data System Practices SPACECRAFT ONBOARD INTERFACE SERVICESSUBNETWORK MEMORY ACCESS SERVICE RECOMMENDED PRACTICE CCSDS 852.0
22、-M-1 MAGENTA BOOK December 2009 ISO 18426:2013(E)3 ISO 2013 All rights reservedBS ISO 18426:2013CCSDS RECOMMENDED PRACTICE FOR SOIS SUBNETWORK MEMORY ACCESS SERVICE AUTHORITY Issue: Recommended Practice, Issue 1 Date: December 2009 Location: Washington, DC, USA This document has been approved for pu
23、blication 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 Con
24、sultative 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 S
25、pace Operations Mission Directorate NASA Headquarters Washington, DC 20546-0001, USA CCSDS 852.0-M-1 Page i December 2009 ISO 18426:2013(E)4 ISO 2013 All rights reservedBS ISO 18426:2013CCSDS RECOMMENDED PRACTICE FOR SOIS SUBNETWORK MEMORY ACCESS SERVICE STATEMENT OF INTENT The Consultative Committe
26、e 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
27、in the CCSDS is completely voluntary, the results of Committee actions are termed Recommendations and are not in themselves considered binding on any Agency. CCSDS Recommendations take two forms: Recommended Standards that are prescriptive and are the formal vehicles by which CCSDS Agencies create t
28、he standards that specify how elements of their space mission support infrastructure shall operate and interoperate with others; and Recommended Practices that are more descriptive in nature and are intended to provide general guidance about how to approach a particular problem associated with space
29、 mission support. This Recommended Practice is issued by, and represents the consensus of, the CCSDS members. Endorsement of this Recommended Practice is entirely voluntary and does not imply a commitment by any Agency or organization to implement its recommendations in a prescriptive sense. No late
30、r than five years from its date of issuance, this Recommended Practice 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 cancelled. In
31、those instances when a new version of a Recommended Practice is issued, existing CCSDS-related member Practices and implementations are not negated or deemed to be non-CCSDS compatible. It is the responsibility of each member to determine when such Practices or implementations are to be modified. Ea
32、ch member is, however, strongly encouraged to direct planning for its new Practices and implementations towards the later version of the Recommended Practice. CCSDS 852.0-M-1 Page ii December 2009 ISO 18426:2013(E)5 ISO 2013 All rights reservedBS ISO 18426:2013CCSDS RECOMMENDED PRACTICE FOR SOIS SUB
33、NETWORK MEMORY ACCESS SERVICE FOREWORD This document is a technical Recommended Practice for use in developing flight and ground systems for space missions and has been prepared by the Consultative Committee for Space Data Systems (CCSDS). The Subnetwork Memory Access Service described herein is int
34、ended for missions that are cross-supported between Agencies of the CCSDS, in the framework of the Spacecraft Onboard Interface Services (SOIS) CCSDS area. This Recommended Practice specifies a service to be used by space missions to directly access memory locations distributed over an onboard subne
35、twork. The SOIS Subnetwork Memory Access Service is a simple service which may be used to read from or write to memory locations or memory blocks held in data systems or in unsophisticated devices. The service interface is only present in the data system invoking the service. The SOIS Subnetwork Mem
36、ory Access Service provides a common service interface regardless of the particular type of data link being used for communication. Through the process of normal evolution, it is expected that expansion, deletion, or modification of this document may occur. This Recommended Practice is therefore sub
37、ject to CCSDS document management and change control procedures, which are defined in the Procedures Manual for the Consultative Committee for Space Data Systems. Current versions of CCSDS documents are maintained at the CCSDS Web site: http:/www.ccsds.org/ Questions relating to the contents or stat
38、us of this document should be addressed to the CCSDS Secretariat at the address indicated on page i. CCSDS 852.0-M-1 Page iii December 2009 ISO 18426:2013(E)6 ISO 2013 All rights reservedBS ISO 18426:2013CCSDS RECOMMENDED PRACTICE FOR SOIS SUBNETWORK MEMORY ACCESS SERVICE At time of publication, the
39、 active Member and Observer Agencies of the CCSDS were: Member Agencies Agenzia Spaziale Italiana (ASI)/Italy. British National Space Centre (BNSC)/United Kingdom. Canadian Space Agency (CSA)/Canada. Centre National dEtudes Spatiales (CNES)/France. China National Space Administration (CNSA)/Peoples
40、Republic of China. Deutsches Zentrum fr Luft- und Raumfahrt e.V. (DLR)/Germany. European Space Agency (ESA)/Europe. Russian Federal Space Agency (RFSA)/Russian Federation. Instituto Nacional de Pesquisas Espaciais (INPE)/Brazil. Japan Aerospace Exploration Agency (JAXA)/Japan. National Aeronautics a
41、nd Space Administration (NASA)/USA. Observer Agencies Austrian Space Agency (ASA)/Austria. Belgian Federal Science Policy Office (BFSPO)/Belgium. Central Research Institute of Machine Building (TsNIIMash)/Russian Federation. Centro Tecnico Aeroespacial (CTA)/Brazil. Chinese Academy of Sciences (CAS)
42、/China. Chinese Academy of Space Technology (CAST)/China. Commonwealth Scientific and Industrial Research Organization (CSIRO)/Australia. CSIR Satellite Applications Centre (CSIR)/Republic of South Africa. Danish National Space Center (DNSC)/Denmark. European Organization for the Exploitation of Met
43、eorological Satellites (EUMETSAT)/Europe. European Telecommunications Satellite Organization (EUTELSAT)/Europe. Geo-Informatics and Space Technology Development Agency (GISTDA)/Thailand. Hellenic National Space Committee (HNSC)/Greece. Indian Space Research Organization (ISRO)/India. Institute of Sp
44、ace Research (IKI)/Russian Federation. KFKI Research Institute for Particle section 2, describing general concepts and assumptions; section 3, containing the Subnetwork Memory Access Service specification; section 4, containing the Management Information Base (MIB) for the service; section 5, compri
45、sing a Service Conformance Statement Proforma. In addition, annex A contains informative references. CCSDS 852.0-M-1 Page 1-1 December 2009 ISO 18426:2013(E)10 ISO 2013 All rights reservedBS ISO 18426:2013CCSDS RECOMMENDED PRACTICE FOR SOIS SUBNETWORK MEMORY ACCESS SERVICE 1.5 CONVENTIONS AND DEFINI
46、TIONS 1.5.1 BIT NUMBERING CONVENTION AND NOMENCLATURE In this document, the following convention is used to identify each bit in an N-bit field. The first bit in the field to be transmitted (i.e., the most left justified when drawing a figure) is defined to be Bit 0; the following bit is defined to
47、be Bit 1 and so on up to Bit N1. When the field is used to express a binary value (such as a counter), the Most Significant Bit (MSB) shall be the first transmitted bit of the field, i.e., Bit 0 (see figure 1-1). BIT 0 BIT N1N-BIT DATA FIELDFIRST BIT TRANSFERRED = MSBFigure 1-1: Bit Numbering Conven
48、tion In accordance with modern data communications practice, spacecraft data fields are often grouped into eight-bit words widely known as bytes. Throughout this Recommended Practice, such an eight-bit word is called an octet. The numbering for octets within a data structure starts with zero. By CCS
49、DS convention, any spare bits are permanently set to 0. 1.5.2 DEFINITIONS 1.5.2.1 General For the purpose of this document the following definitions apply. 1.5.2.2 Definitions from the Open Systems Interconnection (OSI) Basic Reference Model This document is defined using the style established by the Open Systems Interconnection (OSI) Basic Reference Model (reference A3). This model provides a common framework for the development of stan
