ISO 18442:2013

INTERNATIONAL ISO
STANDARD 18442
First edition
2013-06-01

Space data and information transfer
systems — Space Link Extension —
Application Program Interface for Return
All Frames Service
Systèmes de transfert des informations et données spatiales —
Extension de liaisons spatiales — Interface du programme d'application
pour service de retour par tout réseau




Reference number
ISO 18442:2013(E)
©
ISO 2013

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ISO 18442:2013(E)

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©  ISO 2013
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ISO 18442:2013(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.
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.
ISO 18442 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as
CCSDS 915.1-M-1, October 2008) 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.

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INTERNATIONAL STANDARD ISO 18442:2013(E)

Space data and information transfer systems — Space Link
Extension — Application Program Interface for Return All
Frames Service
1 Scope
This International Standard specifies extensions to the API needed for support of the Return All Frames (RAF)
service defined in Space Link Extension—Return All Frames Service Specification, CCSDS 911.1-B-2.
This International Standard defines extensions to the SLE API in terms of:
a) the RAF-specific functionality provided by API components;
b) the RAF-specific interfaces provided by API components; and
c) the externally visible behavior associated with the RAF interfaces exported by the components.
It does not specify
a) individual implementations or products;
b) the internal design of the components; and
c) the technology used for communications.
This International Standard defines only interfaces and behavior that must be provided by implementations
supporting the Return All Frames service in addition to the specification in Space Link Extension—Application
Program Interface for Transfer Services—Core Specification, CCSDS 914.0-M-1.
The scope and field of application are furthermore detailed in subclause 1.3 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 915.1-M-1, October 2008, Space Link Extension — Application Program Interface for Return All
Frames Service.
For the purposes of international standardization, the modifications outlined below shall apply to the specific
clauses and paragraphs of publication CCSDS 915.1-M-1.
Pages i to v
This part is information which is relevant to the CCSDS publication only.
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ISO 18442:2013(E)
Page 1-7
Add the following information to the reference indicated:
[1] Document CCSDS 910.4-B-2, October 2005, is equivalent to ISO 15396:2007.
[2] Document CCSDS 911.1-B-2, December 2004, is equivalent to ISO 22669:2007.
[3] Document CCSDS 914.0-M-1, October 2008, is equivalent to ISO 18441:2013.
Page C-1
Add the following information to the reference indicated:
[C4] Document CCSDS 913.1-B-1, September 2008, is equivalent to ISO 18440:2013.
3 Revision of publication CCSDS 915.1-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 915.1-
M-1. To this end, NASA will act as a liaison body between CCSDS and ISO.

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ISO 18442:2013(E)

Recommendation for Space Data System Practices
SPACE LINK EXTENSION—
APPLICATION PROGRAM
INTERFACE FOR RETURN
ALL FRAMES SERVICE
RECOMMENDED PRACTICE
CCSDS 915.1-M-1
MAGENTA BOOK
October 2008
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ISO 18442:2013(E)
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF SERVICE
AUTHORITY



Issue: Recommended Practice, Issue 1
Date: October 2008
Location: 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 915.1-M-1 Page i October 2008
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ISO 18442:2013(E)
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF 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 915.1-M-1 Page ii October 2008
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ISO 18442:2013(E)
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF 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 [3]). 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.
Through the process of normal evolution, it is expected that expansion, deletion, or
modification of this document may occur. This Recommended Practice is therefore subject
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 status of this document should be addressed to the
CCSDS Secretariat at the address indicated on page i.
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ISO 18442:2013(E)
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF SERVICE
At time of publication, the 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 d’Etudes Spatiales (CNES)/France.
– China National Space Administration (CNSA)/People’s Republic of China.
– Deutsches Zentrum für Luft- und Raumfahrt e.V. (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.

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)/China.
– Chinese Academy of Space Technology (CAST)/China.
– Commonwealth Scientific and Industrial Research Organization (CSIRO)/Australia.
– Danish National Space Center (DNSC)/Denmark.
– European Organization for the Exploitation of Meteorological Satellites
(EUMETSAT)/Europe.
– European Telecommunications Satellite Organization (EUTELSAT)/Europe.
– 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.
– MIKOMTEK: CSIR (CSIR)/Republic of South Africa.
– Ministry of Communications (MOC)/Israel.
– National Institute of Information and Communications Technology (NICT)/Japan.
– National Oceanic and Atmospheric Administration (NOAA)/USA.
– National Space Organization (NSPO)/Chinese Taipei.
– Naval Center for Space Technology (NCST)/USA.
– Space and Upper Atmosphere Research Commission (SUPARCO)/Pakistan.
– Swedish Space Corporation (SSC)/Sweden.
– United States Geological Survey (USGS)/USA.
CCSDS 915.1-M-1 Page iv October 2008
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ISO 18442:2013(E)
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF SERVICE
DOCUMENT CONTROL

Document Title Date Status
CCSDS Space Link Extension—Application October Original issue
915.1-M-1 Program Interface for Return All 2008
Frames Service, Recommended
Practice, Issue 1




CCSDS 915.1-M-1 Page v October 2008
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ISO 18442:2013(E)
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF SERVICE
CONTENTS
Section Page
1  INTRODUCTION . 1-1

1.1  PURPOSE . 1-1
1.2  SCOPE . 1-1
1.3  APPLICABILITY . 1-1
1.4  RATIONALE . 1-2
1.5  DOCUMENT STRUCTURE . 1-2
1.6  DEFINITIONS, NOMENCLATURE, AND CONVENTIONS . 1-5
1.7  REFERENCES . 1-7

2  OVERVIEW . 2-1

2.1  INTRODUCTION . 2-1
2.2  PACKAGE RAF SERVICE INSTANCES . 2-1
2.3  PACKAGE RAF OPERATIONS . 2-5
2.4  SECURITY ASPECTS OF THE SLE RAF TRANSFER SERVICE . 2-8

3  RAF SPECIFIC SPECIFICATIONS FOR API COMPONENTS . 3-1

3.1  API SERVICE ELEMENT . 3-1
3.2  SLE OPERATIONS . 3-6
3.3  SLE APPLICATION . 3-7
3.4  SEQUENCE OF DIAGNOSTIC CODES . 3-7

ANNEX A RAF 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 . 1-3
2-1  RAF Service Instances . 2-2
2-2  RAF Operation Object Interfaces . 2-7

Table
2-1  RAF Configuration Parameters . 2-4
2-2  RAF Status Information . 2-5
2-3  Mapping of RAF Operations to Operation Object Interfaces . 2-6


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ISO 18442:2013(E)
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1 INTRODUCTION
1.1 PURPOSE
The Recommended Practice Space Link Extension—Application Program Interface for
Transfer Services—Core Specification (reference [3]) specifies a C++ API for CCSDS Space
Link Extension Transfer Services. The API is intended for use by application programs
implementing SLE transfer services.
Reference [3] defines the architecture of the API and the functionality on a generic level,
which is independent of specific SLE services and communication technologies. It is thus
necessary to add service type-specific specifications in supplemental Recommended
Practices. The purpose of this document is to specify extensions to the API needed for
support of the Return All Frames (RAF) service defined in reference [2].
1.2 SCOPE
This Recommended Practice defines extensions to the SLE API in terms of:
a) the RAF-specific functionality provided by API components;
b) the RAF-specific interfaces provided by API components; and
c) the externally visible behavior associated with the RAF interfaces exported by the
components.
It does not specify
a) individual implementations or products;
b) the internal design of the components; and
c) the technology used for communications.
This Recommended Practice defines only interfaces and behavior that must be provided by
implementations supporting the Return All Frames service in addition to the specification in
reference [3].
1.3 APPLICABILITY
The RAF Application Program Interface specified in this document supports two versions of
the RAF service, namely:
a) version 1 as specified by reference [C2]; and
b) version 2 as specified by reference [2].
Support for version 1 of these services is included for backward compatibility purposes for a
limited time and may not be continued in future versions of this specification. Support for
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ISO 18442:2013(E)
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF SERVICE
version 1 of the RAF service implies that SLE API implementations of this specification are
able to interoperate with peer SLE systems that comply with the specification of the
Transport Mapping Layer (TML) in ‘Specification of a SLE API Proxy for TCP/IP and
ASN.1’, ESOC, SLES-SW-API-0002-TOS-GCI, Issue 1.1, February 2001.
Any version-dependent provisions within this Recommended Practice are marked as follows:
a) [V1:] for provisions specific to version 1; and
b) [V2:] for provisions specific to version 2.
1.4 RATIONALE
This Recommended Practice specifies the mapping of the RAF service specification to
specific functions and parameters of the SLE API. It also specifies the distribution of
responsibility for specific functions between SLE API software and application software.
The goal of this Recommended Practice is to create a standard for interoperability between:
a) application software using the SLE API and SLE API software implementing the
SLE API; and
b) service user and service provider applications communicating with each other using
the SLE API on both sides.
This interoperability standard also allows exchangeability of different products implementing the
SLE API, as long as they adhere to the interface specification of this Recommended Practice.
1.5 DOCUMENT STRUCTURE
1.5.1 ORGANIZATION
This document is organized as follows:
a) section 1 provides purpose and scope of this specification, identifies conventions, and
lists definitions and references used throughout the document;
b) section 2 provides an overview of the RAF service and describes the API model
extension including support for the RAF service;
c) section 3 contains detailed specifications for the API components and for applications
using the API;
d) annex A provides a formal specification of the API interfaces and data types specific
to the RAF service;
e) annex B lists all acronyms used within this document;
f) annex C lists informative references.
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ISO 18442:2013(E)
CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF SERVICE
1.5.2 SLE SERVICE DOCUMENTATION TREE
The SLE suite of Recommended Standards is based on the cross support model defined in the
SLE Reference Model (reference [1]). The services defined by the reference model
constitute one of the three types of Cross Support Services:
a) Part 1: SLE Services;
b) Part 2: Ground Domain Services; and
c) Part 3: Ground Communications Services.
The SLE services are further divided into SLE service management and SLE transfer
services.
The basic organization of the SLE services and SLE documentation is shown in figure 1-1.
The various documents are described in the following paragraphs.
Space Link Extension
Cross Support
Cross Support Concept SLE Executive
Reference Model
Part 1: SLE Services Summary
Part 1: SLE Services
SLE Transfer Services
Forward SLE Service Return SLE Service Internet Protocol for SLE Service
Specifications Specifications Transfer Services Management Suite
SLE API for Transfer Services
Core Specification Summary of
Concept and
Rationale
Forward Return
Application
SLE Service SLE Service
Programmer’s
Specifications Specifications
Guide
Recommended Recommended
Legend: Report (Green) Report (Yellow)
Standard (Blue) Practice (Magenta)

Figure 1-1: SLE Services and SLE API Documentation
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CCSDS RECOMMENDED PRACTICE: API FOR THE SLE RAF SERVICE
a) Cross Support Reference Model—Part 1: Space Link Extension Services, a
Recommended Standard that defines the framework and terminology for the
specification of SLE services.
b) Cross Support Concept—Part 1: Space Link Extension Services, a Report introducing
the concepts of cross support and the SLE services.
c) Space Link Extension Services—Executive Summary, an Administrative Report
providing an overview of Space Link Extension (SLE) Services. It is designed to
assist readers with their review of existing and future SLE documentation.
d) Forward SLE Service Specifications, a set of Recommended Standards that provide
specifications of all forward link SLE services.
e) Return SLE Service Specifications, a set of Recommended Standards that provide
specifications of all return link SLE services.
f) Internet Protocol for Transfer Services, a Recommended Standard providing the
specification of the wire protocol used for SLE transfer services.
g) SLE Service Management Specifications, a set of Recommended Standards that
establish the basis of SLE service management.
h) Application Program Interface for Transfer Services—Core Specification, a
Recommended Practice document specifying the generic part of the API for SLE
transfer services.
i) Application Program Interface for Transfer Services—Summary of Concept and
Rationale, a Report describing the concept and rationale for specification and
implementation of a Application Program Interface for SLE Transfer Services.
j) Application Program Interface for Return Services, a set of Recommended Practice
documents specifying the service type-specific extensions of the API for return link
SLE services.
k) Application Program Interface for Forward Services, a set of Recommended Practice
documents specifying the service type-specific extensions of the API for forward link
SLE services.
l) Application Program Interface for Transfer Services—Application Programmer’s
Guide, a Report containing guidance material and software source code examples for
software developers using the API.
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1.6 DEFINITIONS, NOMENCLATURE, AND CONVENTIONS
1.6.1 DEFINITIONS
1.6.1.1 Definitions from SLE Reference Model
This Recommended Practice makes use of the following terms defined in reference [1]:
a) Return All Frames service (RAF service);
b) operation;
c) service provider (provider);
d) service user (user);
e) SLE transfer service instance;
f) SLE transfer service production;
g) SLE transfer service provision.
1.6.1.2 Definitions from RAF Service
This Recommended Practice makes use of the following terms defined in reference [2]:
a) association;
b) communications service;
c) confirmed operation;
d) delivery mode;
e) invocation;
f) latency limit;
g) lock status;
h) notification;
i) offline processing latency;
j) parameter;
k) performance;
l) port identifier;
m) production status;
n) return;
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o) service instance provision period;
p) transfer buffer;
q) unconfirmed operation.
1.6.1.3 Definitions from ASN.1 Specification
This Recommended Practice makes use of the following terms defined in reference [5]:
a) Object Identifier;
b) Octet String.
1.6.1.4 Definitions from UML Specification
This Recommended Practice makes use of the following terms defined in reference [C8]:
a) Attribute;
b) Base Class;
c) Class;
d) Data Type;
e) Interface;
f) Method.
1.6.1.5 Definitions from API Core Specification
This Recommended Practice makes use of the following terms defined in reference [3]:
a) Application Program Interface;
b) Component.
1.6.2 NOMENCLATURE
The following conventions apply throughout this Recommended Practice:
a) the words ‘shall’ and ‘must’ imply a binding and verifiable specification;
b) the word ‘should’ implies an optional, but desirable, specification;
c) the word ‘may’ implies an optional specification;
d) the words ‘is’, ‘are’, and ‘will’ imply statements of fact.
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1.6.3 CONVENTIONS
This document applies the conventions defined in reference [3].
The RAF-specific model extensions in section 2 are presented using the Unified Modeling
Language (UML) and applying the conventions defined in reference [3].
The RAF-specific specifications for API components in section 3 are presented using the
conventions specified in reference [3].
The RAF-specific data types and interfaces in annex A are specified in the notation of the
C++ programming language using the conventions defined in reference [3].
1.7 REFERENCES
The following documents contain provisions which, through reference in this text, constitute
provisions of this Recommended Practice. At the time of publication, the editions indicated
were valid. All documents are subject to revision, and users of this Recommended Practice
are encouraged to investigate the possibility of applying the most recent editions of the
documents indicated below. The CCSDS Secretariat maintains a register of currently valid
CCSDS documents.
NOTE – A list of informative references is provided in annex C.
[1] Cross Support Reference Model—Part 1: Space Link Extension Services.
Recommendation for Space Data System Standards, CCSDS 910.4-B-2. Blue Book.
Issue 2. Washington, D.C.: CCSDS, October 2005.
[2] Space Link Extension—Return All Frames Service Specification. Recommendation for
Space Data System Standards, CCSDS 911.1-B-2. Blue Book. Issue 2. Washington,
D.C.: CCSDS, December 2004.
[3] Space Link Extension—Application Program Interface for Transfer Services—Core
Specification. Specification Concerning Space Data System Standards, CCSDS 914.0-
M-1. Magenta Book. Issue 1. Washington, D.C.: CCSDS, October 2008.
[4] Programming Languages—C++. International Standard, ISO/IEC 14882:2003. 2nd
ed. Geneva: ISO, 2003.
[5] Information Technology—Abstract Syntax Notation One (ASN.1): Specification of
Basic Notation. International Standard, ISO/IEC 8824-1:2002. 3rd ed. Geneva: ISO,
2002.

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