ISO 18445:2016

INTERNATIONAL ISO
STANDARD 18445
Second edition
2016-11-15
Space data and information transfer
systems — Space link extension —
Application program interface for the
forward CLTU service
Systèmes de transfert des informations et données spatiales — Extension de
liaisons spatiales — Interface du programme d'application pour le service
de l'unité de transmission pour la liaison d'envoi de télécommande (CLTU)
Reference number
©
ISO 2016
©  ISO 2016
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ii © ISO 2016 – All rights reserved

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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. 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 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. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT)
see the following URL: Foreword - Supplementary information
ISO 18445 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as CCSDS
916.1-M-2, September 2015) and was adopted (without modifications 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.
This second edition cancels and replaces the first edition (ISO 18445:2013), which has been technically
revised.
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE FORWARD CLTU SERVICE
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 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 the 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
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 later 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 canceled.
In 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. Each member is, however, strongly encouraged to
direct planning for its new Practices and implementations towards the later version of the
Recommended Practice.
CCSDS 916.1-M-2 Page ii September 2015
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE FORWARD CLTU SERVICE
FOREWORD
This document is a technical Recommended Practice for use in developing ground systems
for space missions and has been prepared by the Consultative Committee for Space Data
Systems (CCSDS). The Application Program Interface described herein is intended for
missions that are cross-supported between Agencies of the CCSDS.
This Recommended Practice specifies service type-specific extensions of the Space Link
Extension Application Program Interface for Transfer Services specified by CCSDS
(reference [5]). It allows implementing organizations within each Agency to proceed with
the development of compatible, derived Standards for the ground systems that are within
their cognizance. Derived Agency Standards may implement only a subset of the optional
features allowed by the Recommended Practice and may incorporate features not addressed
by the Recommended Practice.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CCSDS has processes for identifying patent issues and for securing
from the patent holder agreement that all licensing policies are reasonable and non-
discriminatory. However, CCSDS does not have a patent law staff, and CCSDS shall not be
held responsible for identifying any or all such patent rights.
Through the process of normal evolution, it is expected that expansion, deletion, or
modification of this document may occur. This Recommended Standard is therefore subject
to CCSDS document management and change control procedures, which are defined in
Organization and Processes for the Consultative Committee for Space Data Systems
(CCSDS A02.1-Y-4). Current versions of CCSDS documents are maintained at the CCSDS
Web site:
http://www.ccsds.org/
Questions relating to the contents or status of this document should be sent to the CCSDS
Secretariat at the e-mail address indicated on page i.
CCSDS 916.1-M-2 Page iii September 2015
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE FORWARD CLTU SERVICE
At time of publication, the active Member and Observer Agencies of the CCSDS were:
Member Agencies
– Agenzia Spaziale Italiana (ASI)/Italy.
– Canadian Space Agency (CSA)/Canada.
– Centre National d’Etudes Spatiales (CNES)/France.
– China National Space Administration (CNSA)/People’s Republic of China.
– Deutsches Zentrum für Luft- und Raumfahrt (DLR)/Germany.
– European Space Agency (ESA)/Europe.
– Federal Space Agency (FSA)/Russian Federation.
– Instituto Nacional de Pesquisas Espaciais (INPE)/Brazil.
– Japan Aerospace Exploration Agency (JAXA)/Japan.
– National Aeronautics and Space Administration (NASA)/USA.
– UK Space Agency/United Kingdom.
Observer Agencies
– Austrian Space Agency (ASA)/Austria.
– Belgian Federal Science Policy Office (BFSPO)/Belgium.
– Central Research Institute of Machine Building (TsNIIMash)/Russian Federation.
– China Satellite Launch and Tracking Control General, Beijing Institute of Tracking and
Telecommunications Technology (CLTC/BITTT)/China.
– Chinese Academy of Sciences (CAS)/China.
– Chinese Academy of Space Technology (CAST)/China.
– Commonwealth Scientific and Industrial Research Organization (CSIRO)/Australia.
– Danish National Space Center (DNSC)/Denmark.
– Departamento de Ciência e Tecnologia Aeroespacial (DCTA)/Brazil.
– Electronics and Telecommunications Research Institute (ETRI)/Korea.
– European Organization for the Exploitation of Meteorological 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 Space Research (IKI)/Russian Federation.
– KFKI Research Institute for Particle & Nuclear Physics (KFKI)/Hungary.
– Korea Aerospace Research Institute (KARI)/Korea.
– Ministry of Communications (MOC)/Israel.
– National Institute of Information and Communications Technology (NICT)/Japan.
– National Oceanic and Atmospheric Administration (NOAA)/USA.
– National Space Agency of the Republic of Kazakhstan (NSARK)/Kazakhstan.
– National Space Organization (NSPO)/Chinese Taipei.
– Naval Center for Space Technology (NCST)/USA.
– Scientific and Technological Research Council of Turkey (TUBITAK)/Turkey.
– South African National Space Agency (SANSA)/Republic of South Africa.
– Space and Upper Atmosphere Research Commission (SUPARCO)/Pakistan.
– Swedish Space Corporation (SSC)/Sweden.
– Swiss Space Office (SSO)/Switzerland.
– United States Geological Survey (USGS)/USA.
CCSDS 916.1-M-2 Page iv September 2015
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE FORWARD CLTU SERVICE
DOCUMENT CONTROL
Document Title Date Status
CCSDS Space Link Extension—Application October Original issue, superseded
916.1-M-1 Program Interface for the Forward 2008
CLTU Service, Recommended
Practice, Issue 1
CCSDS Space Link Extension—Application September Current issue:
916.1-M-2 Program Interface for the Forward 2015 – updates text to
CLTU Service, Recommended accommodate changes
Practice, Issue 2 in current version of
SLE service
specification;
– differentiates
applicability by SLE
service specification
version;
– updates references.
NOTE – Substantive changes from the previous issue are marked with change bars in the
inside margin.
CCSDS 916.1-M-2 Page v September 2015
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE FORWARD CLTU SERVICE
CONTENTS
Section Page
1 INTRODUCTION. 1-1

1.1 PURPOSE . 1-1
1.2 SCOPE . 1-1
1.3 APPLICABILITY . 1-2
1.4 RATIONALE . 1-2
1.5 DOCUMENT STRUCTURE . 1-3
1.6 DEFINITIONS, NOMENCLATURE, AND CONVENTIONS . 1-5
1.7 REFERENCES . 1-8

2 OVERVIEW . 2-1

2.1 INTRODUCTION . 2-1
2.2 PACKAGE CLTU SERVICE INSTANCES . 2-1
2.3 PACKAGE CLTU OPERATIONS . 2-13
2.4 SECURITY ASPECTS OF THE SLE FORWARD CLTU
TRANSFER SERVICE . 2-15

3 CLTU SPECIFIC SPECIFICATIONS FOR API COMPONENTS . 3-1

3.1 API SERVICE ELEMENT . 3-1
3.2 SLE OPERATIONS . 3-15
3.3 SLE APPLICATION . 3-15

ANNEX A CLTU SPECIFIC INTERFACES (NORMATIVE) . A-1
ANNEX B ACRONYMS (INFORMATIVE) .B-1
ANNEX C INFORMATIVE REFERENCES (INFORMATIVE) . C-1
Figure
1-1 SLE Services and SLE API Documentation . 1-4
2-1 CLTU Service Instances . 2-2
2-2 CLTU Operation Objects . 2-14

Table
2-1 Production Events Reported via the Interface ICLTU_SIUpdate . 2-5
2-2 CLTU Configuration Parameters Handled by the Service Element . 2-7
2-3 CLTU Status Parameters Handled by the Service Element . 2-9
2-4 CLTU Production Status .
...