ISO 20207:2015

Space data and information transfer systems — CCSDS Space Link Protocols over ETSI DVB-S2 Standard

The DVB-S2 standard (reference [1]) proposes advanced modulation techniques (QPSK, 8PSK, 16APSK, and 32APSK) and a wide range of coding rates (from 1/4 to 9/10) with near-Shannon coding schemes (LDPC codes). This high number of modulation and coding schemes allows a wide range of possibilities to satisfy specific mission constraints. Moreover, to maximize the telemetry system throughput, it appears possible to adapt the transmitted waveform (and the useful data rate) to the variable conditions of the link. The DVB-S2 standard can actually implement Variable Coding and Modulation (VCM) mode, which adapts the transmission scheme to the channel conditions following a predetermined schedule (for example, following a dynamic link budget). When a channel is available to provide feedback (e.g., via a telecommand link), the transmission scheme can be dynamically adjusted using the Adaptive Coding and Modulation (ACM) mode. The use of the DVB-S2 standard for telemetry makes possible the use of generic Very High Scale Integrated Circuits (VHSIC) Hardware Description Language (VHDL) Intellectual Property (IP) modules for developments. The use of a widely implemented standard simplifies finding transmitting or receiving equipment to check compatibility. Finally, for the ground part, some telecom DVB-S2 receivers or Application Specific Integrated Circuits (ASICs) developed for the telecom market could be reused. ISO 20207:2015 is an adaptation profile describing how to use the DVB-S2 standard to transmit CCSDS Transfer Frames for telemetry purpose. The interface between CCSDS and DVB-S2 is based on the Attached Synchronization Marker (ASM) and Channel Access Data Unit (CADU) already introduced in reference [2]. DVB-S2 is used in this adaptation profile as a complete and self-sufficient standard, and definitions and specifications taken from DVB-S2 are applicable only in the context of this Recommended Standard. However, individual DVB-S2 functions or components (e.g., VCM/ACM, 8-PSK, and higher-order modulations) might be reused, redefined, and/or respecified by CCSDS in future Recommended Standards.

Systèmes de transfert des informations et données spatiales — Protocole pour liaisons spatiales CCSDS utilisant la Norme ETSI DVB-S2

General Information

• Status: Published
• Publication Date: 10-Aug-2015
• ICS: 49.140 - Space systems and operations
• Technical Committee: ISO/TC 20/SC 13 - Space data and information transfer systems
• Drafting Committee: ISO/TC 20/SC 13 - Space data and information transfer systems
• Current Stage: 9093 - International Standard confirmed
• Start Date: 14-Nov-2023
• Completion Date: 13-Dec-2025

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20207
First edition
2015-08-15
Space data and information transfer
systems — CCSDS Space Link Protocols
over ETSI DVB-S2 Standard
Systèmes de transfert des informations et données spatiales —
Protocole pour liaisons spatiales CCSDS utilisant la Norme ETSI DVB-S2
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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 intranet, without prior
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ii © ISO 2015 – 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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
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 20207 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as
CCSDS 131.3-B-1, March 2013) 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.

Recommendation for Space Data System Standards
CCSDS SPACE LINK
PROTOCOLS OVER
ETSI DVB-S2
STANDARD
RECOMMENDED STANDARD
CCSDS 131.3-B-1
BLUE BOOK
March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
AUTHORITY
Issue: Recommended Standard, Issue 1
Date: March 2013
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 Organization and Processes 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 131.3-B-1 Page i March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
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 three 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
non-CCSDS 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 131.3-B-1 Page ii March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
FOREWORD
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 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.
CCSDS 131.3-B-1 Page iii March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
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 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.
– 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.
– CSIR Satellite Applications Centre (CSIR)/Republic of South Africa.
– Danish National Space Center (DNSC)/Denmark.
– Departamento de Ciência e Tecnologia Aeroespacial (DCTA)/Brazil.
– 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.
– Space and Upper Atmosphere Research Commission (SUPARCO)/Pakistan.
– Swedish Space Corporation (SSC)/Sweden.
– United States Geological Survey (USGS)/USA.
CCSDS 131.3-B-1 Page iv March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
DOCUMENT CONTROL
Document Title Date Status
CCSDS CCSDS Space Link Protocols over March 2013 Current issue
131.3-B-1 ETSI DVB-S2 Standard,
Recommended Standard, Issue 1
CCSDS 131.3-B-1 Page v March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
CONTENTS
Section Page
1 INTRODUCTION . 1-1

1.1 BACKGROUND . 1-1
1.2 PURPOSE . 1-1
1.3 SCOPE . 1-1
1.4 APPLICABILITY . 1-2
1.5 DOCUMENT STRUCTURE . 1-2
1.6 NOMENCLATURE . 1-3
1.7 DEFINITIONS AND CONVENTIONS. 1-3
1.8 PATENTED TECHNOLOGIES . 1-5
1.9 REFERENCE DOCUMENTS . 1-5

2 OVERVIEW . 2-1

2.1 ARCHITECTURE . 2-1
2.2 SUMMARY OF FUNCTIONS . 2-1
2.3 INTERNAL ORGANIZATION . 2-2

3 CADU STREAM GENERATION . 3-1

3.1 OVERVIEW . 3-1
3.2 INPUT CCSDS TRANSFER FRAMES . 3-1
3.3 CHANNEL ACCESS DATA UNIT . 3-1

4 DVB-S2 TRANSMISSION . 4-1

4.1 OVERVIEW . 4-1
4.2 DVB-S2 MODE ADAPTATION FORMAT . 4-1
4.3 AVERAGE SIGNAL ENERGY. 4-1
4.4 SHAPING FILTERING . 4-2

5 MANAGED PARAMETERS . 5-1

5.1 OVERVIEW . 5-1
5.2 PERMANENT MANAGED PARAMETERS . 5-1
5.3 VARIABLE MANAGED PARAMETERS . 5-3

ANNEX A SERVICE DEFINITION (NORMATIVE) . A-1
ANNEX B SECURITY, SANA, AND PATENT CONSIDERATIONS
(INFORMATIVE) .B-1
CCSDS 131.3-B-1 Page vi March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
CONTENTS (continued)
Section Page
ANNEX C ACRONYMS AND TERMS (INFORMATIVE) . C-1
ANNEX D DVB-S2 SPECTRAL EFFICIENCIES (INFORMATIVE) . D-1
Figure
1-1 Bit Numbering Convention . 1-5
2-1 Relationship with OSI Layers . 2-1
2-2 Stream Format While Transmitting CCSDS Transfer Frames Using DVB-S2 . 2-3

Table
5-1 Permanent Managed Parameters for Transfer Frame Synchronization . 5-2
5-2 Permanent Managed Parameters for DVB-S2 Transmission . 5-2
5-3 Variable Managed Parameters . 5-3

CCSDS 131.3-B-1 Page vii March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
1 INTRODUCTION
1.1 BACKGROUND
The high demand in TV broadcasting has pushed the European Telecommunications
Standards Institute (ETSI) to define a new satellite communication standard called Digital
Video Broadcasting—Satellite—Second Generation (DVB-S2) (reference [1]). This standard
is suited to high data rate transmissions, and proposes variable or adaptive coding and
modulation with high power and bandwidth efficiencies.
1.2 PURPOSE
The purpose of this document is to define a recommended interface between CCSDS Space
Link Protocols (references [3] and [4]) and the DVB-S2 telecom standard (reference [1]), and
to recommend options of the DVB-S2 standard suited to high data rate telemetry
applications, such as Earth Exploration Satellite Services (EESS) payload telemetry.
1.3 SCOPE
The DVB-S2 standard (reference [1]) proposes advanced modulation techniques (QPSK,
8PSK, 16APSK, and 32APSK) and a wide range of coding rates (from 1/4 to 9/10) with
near-Shannon coding schemes (LDPC codes). This high number of modulation and coding
schemes allows a wide range of possibilities to satisfy specific mission constraints.
Moreover, to maximize the telemetry system throughput, it appears possible to adapt the
transmitted waveform (and the useful data rate) to the variable conditions of the link. The
DVB-S2 standard can actually implement Variable Coding and Modulation (VCM) mode,
which adapts the transmission scheme to the channel conditions following a predetermined
schedule (for example, following a dynamic link budget). When a channel is available to
provide feedback (e.g., via a telecommand link), the transmission scheme can be dynamically
adjusted using the Adaptive Coding and Modulation (ACM) mode.
The use of the DVB-S2 standard for telemetry makes possible the use of generic Very High
Scale Integrated Circuits (VHSIC) Hardware Description Language (VHDL) Intellectual
Property (IP) modules for developments. The use of a widely implemented standard
simplifies finding transmitting or receiving equipment to check compatibility. Finally, for the
ground part, some telecom DVB-S2 receivers or Application Specific Integrated Circuits
(ASICs) developed for the telecom market could be reused.
This Recommended Standard is an adaptation profile describing how to use the DVB-S2
standard to transmit CCSDS Transfer Frames for telemetry purpose. The interface between
CCSDS and DVB-S2 is based on the Attached Synchronization Marker (ASM) and Channel
Access Data Unit (CADU) already introduced in reference [2].
CCSDS 131.3-B-1 Page 1-1 March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
DVB-S2 is used in this adaptation profile as a complete and self-sufficient standard, and
definitions and specifications taken from DVB-S2 are applicable only in the context of this
Recommended Standard. However, individual DVB-S2 functions or components (e.g.,
VCM/ACM, 8-PSK, and higher-order modulations) might be reused, redefined, and/or
respecified by CCSDS in future Recommended Standards.
1.4 APPLICABILITY
This Recommended Standard applies to the creation of Agency standards and to data
communications over space links between CCSDS Agencies in cross-support situations for
near Earth Exploration Satellite Services (EESS) payload telemetry. This Recommended
Standard includes comprehensive specification of the data formats and procedures for inter-
Agency cross support. It is neither a specification of, nor a design for, real systems that may
be implemented for existing or future missions.
The Recommended Standard specified in this document is to be invoked through the normal
standards programs of each CCSDS Agency and is applicable to those missions for which
cross support based on capabilities described in this Recommended Standard is anticipated.
Where mandatory capabilities are clearly indicated in sections of this Recommended
Standard, it is mandatory to implement them when this document is used as a basis for cross
support. Where options are allowed or implied, implementation of these options is subject to
specific bilateral cross-support agreements between the Agencies involved.
1.5 DOCUMENT STRUCTURE
Section 1 presents the background, purpose, scope, applicability, and rationale of this
Recommended Standard and lists the conventions, definitions, and references used
throughout the document.
Section 2 provides an overview of the system architecture.
Section 3 specifies the CADU stream generation.
Section 4 specifies the DVB-S2 transmission of the CADU stream.
Section 5 specifies managed parameters.
Annex Α provides the service definition.
Annex B discusses security, Space Assigned Numbers Authority (SANA), and patent
considerations.
Annex C lists acronyms and terms used within this document.
Annex D lists MODCOD available in the DVB-S2 standard.
CCSDS 131.3-B-1 Page 1-2 March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
1.6 NOMENCLATURE
1.6.1 NORMATIVE TEXT
The following conventions apply for the normative specifications in this Recommended
Standard:
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.
NOTE – These conventions do not imply constraints on diction in text that is clearly
informative in nature.
1.6.2 INFORMATIVE TEXT
In the normative sections of this document, informative text is set off from the normative
specifications either in notes or under one of the following subsection headings:
– Overview;
– Background;
– Rationale;
– Discussion.
1.7 DEFINITIONS AND CONVENTIONS
1.7.1 DEFINITIONS
1.7.1.1 Definitions from the Open System Interconnection (OSI) Basic Reference
Model
This Recommended Standard makes use of a number of terms defined in reference [5]. The
use of those terms in this Recommended Standard shall be understood in a generic sense, i.e.,
in the sense that those terms are generally applicable to any of a variety of technologies that
provide for the exchange of information between real systems. Those terms are:
a) Data Link Layer;
b) Physical Layer;
c) service;
d) service data unit.
CCSDS 131.3-B-1 Page 1-3 March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
1.7.1.2 Definitions from OSI Service Definition Conventions
This Recommended Standard makes use of a number of terms defined in reference [6]. The
use of those terms in this Recommended Standard shall be understood in a generic sense, i.e.,
in the sense that those terms are generally applicable to any of a variety of technologies that
provide for the exchange of information between real systems. Those terms are:
a) indication;
b) primitive;
c) request;
d) service provider;
e) service user.
1.7.1.3 Definition of CADU
The CADU is defined in reference [2]. In this Recommended Standard, CADU only consists
in the concatenation of an ASM and a Transfer Frame.
1.7.1.4 Definitions from ETSI DVB-S2 Standard
This Recommended Standard makes use of a number of terms defined in reference [1].
a) DATAFIELD and DFL are defined in paragraph 5.1.5 of reference [1].
b) BBHEADER is defined in paragraph 5.1.6 of reference [1].
c) FECFRAME is defined in paragraph 5.3 of reference [1].
d) PLFRAME is defined in paragraph 5.5 of reference [1].
e) Dummy PLFRAME is defined in paragraph 5.5.1 of reference [1].
f) PLHEADER and MODCOD are defined in paragraph 5.5.2 of reference [1].
1.7.2 CONVENTIONS
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 be ‘Bit 1’ and so on up to ‘Bit N–1’.
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).
CCSDS 131.3-B-1 Page 1-4 March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
BIT 0 BIT N–1
N-BIT DATA FIELD
FIRST BIT TRANSFERRED = MSB
Figure 1-1: Bit Numbering Convention
In accordance with standard data-communications practice, data fields are often grouped into
8-bit ‘words’ which conform to the above convention. Throughout this Recommended
Standard, such an 8-bit word is called an ‘octet’.
The numbering for octets within a data structure starts with ‘0’.
1.8 PATENTED TECHNOLOGIES
The CCSDS draws attention to the fact that it is claimed that compliance with this document
may involve the use of patents.
The CCSDS takes no position concerning the evidence, validity, and scope of these patent
rights.
The holders of these patent rights have assured the CCSDS that they are willing to negotiate
licenses under reasonable and non-discriminatory terms and conditions with applicants
throughout the world. In this respect, the statements of the holders of these patent rights are
registered with CCSDS. Information can be obtained from the CCSDS Secretariat at the
address indicated on page i. Contact information for the holders of these patent rights is
provided in annex B.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. The CCSDS shall not be held
responsible for identifying any or all such patent rights.
1.9 REFERENCE DOCUMENTS
The following publications contain provisions which, through reference in this text,
constitute provisions of this document. At the time of publication, the editions indicated
were valid. All publications are subject to revision, and users of this document are
encouraged to investigate the possibility of applying the most recent editions of the
publications indicated below. The CCSDS Secretariat maintains a register of currently valid
CCSDS publications.
CCSDS 131.3-B-1 Page 1-5 March 2013
ISO20207:2015(E)
CCSDS RECOMMENDED STANDARD FOR CCSDS SPACE LINK PROTOCOLS OVER DVB-S2
[1] Digital Video Broadcasting (DVB); Second Generation Framing Structure, Channel
Coding and Modulation Systems for Broadcasting, Interactive Services, News
Gathering and other Broadband Satellite Applications. ETSI EN 302 307 V1.2.1
(2009-08). Sophia-Antipolis: ETSI, 2009.
NOTE – ETSI standards are available for free download at http://www.etsi.org.
[2] TM Synchronization and Channel Coding. Recommendation for Space Data System
Standards, CCSDS 131.0-B-2. Blue Book. Issue 2. Washington, D.C.: CCSDS,
August 2011.
[3] TM Space Data Link Protocol. Recommendation for Space Data System Standards,
CCSDS 132.0-B-1. Blue Book. Issue 1. Washington, D.C.: CCSDS, September 2003.
[4] AOS Space Data Link Protocol. Recommendation for Space Data System Standards,
CCSDS 732.0-B-2. Blue Book. Issue 2. Washington, D.C.: CCSDS, July 2006.
[5] Information Technology—Open Systems Interconnection—Basic Reference Model: The
Basic Model. International Standard, ISO/IEC 7498-1:1994. 2nd ed. Geneva: ISO,
1994.
[6] Information Technology—Open Systems Interconnection—Basic Reference Model—
Conventions for the Definition of OSI Services. International Standard, ISO/IEC
10731:1994. Geneva: ISO, 1994.

CCSDS 131.3-B-1 Page 1-6 March 2013
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