ISO 22646:2005
(Main)Space data and information transfer systems — Space packet protocol
Space data and information transfer systems — Space packet protocol
ISO 22646:2005 specifies the space packet protocol for transferring space application data over a network involving a ground-to-space or space-to-space communications link.
Systèmes de transfert des données et informations spatiales — Protocole pour données spatiales par paquets
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22646
First edition
2005-07-15
Space data and information transfer
systems — Space packet protocol
Systèmes de transfert des données et informations spatiales —
Protocole pour données spatiales par paquets
Reference number
ISO 22646:2005(E)
©
ISO 2005
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ISO 22646:2005(E)
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ISO 22646:2005(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 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 22646 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as
CCSDS 133.0-B-1, September 2003) 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 22646:2005(E)
Space data and information transfer systems — Space packet
protocol
1 Scope
This International Standard specifies the space packet protocol for transferring space application data over a
network involving a ground-to-space or space-to-space communications link.
The scope and field of application are furthermore detailed in subclauses 1.1 and 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 133.0-B-1, September 2003, Space packet protocol.
For the purposes of international standardization, the modifications outlined below shall apply to the specific
clauses and paragraphs of publication CCSDS 133.0-B-1.
Pages i to v
This part is information which is relevant to the CCSDS publication only.
Page 1-5
Add the following information to the references indicated:
[3] Document CCSDS 301.0-B-3, January 2002, is equivalent to ISO 11104:2003.
1)
[4] Document CCSDS 135.0-B-1, January 2002, is equivalent to ISO 22647:— .
Page B-1
Add the following information to the references indicated:
[B2] Document CCSDS 102.0-B-5, November 2000, is equivalent to ISO 13419:2003.
[B3] Document CCSDS 203.0-B-2, June 2001, is equivalent to ISO 12174:2003.
[B6] Document CCSDS 132.0-B-1, September 2003, is equivalent to ISO 22645:2005.
1) To be published.
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ISO 22646:2005(E)
[B7] Document CCSDS 232.0-B-1, September 2003, is equivalent to ISO 22664:2005.
[B8] Document CCSDS 732.0-B-1, September 2003, is equivalent to ISO 22666:2005.
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 133.0-B-1.
To this end, NASA will act as a liaison body between CCSDS and ISO.
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ISO 22646:2005(E)
RECOMMENDATION FOR SPACE
DATA SYSTEM STANDARDS
SPACE PACKET
PROTOCOL
CCSDS 133.0-B-1
BLUE BOOK
September 2003
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ISO 22646:2005(E)
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
AUTHORITY
Issue: Blue Book, Issue 1
Date: September 2003
Location: Not Applicable
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 Recommendations is detailed in reference [B1], and the
record of Agency participation in the authorization of this document can be obtained from
the CCSDS Secretariat at the address below.
This Recommendation is published and maintained by:
CCSDS Secretariat
Office of Space Communication (Code M-3)
National Aeronautics and Space Administration
Washington, DC 20546, USA
CCSDS 133.0-B-1 Page i September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
STATEMENT OF INTENT
The Consultative Committee for Space Data Systems (CCSDS) is an organization officially
established by the management of member space Agencies. 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 considered binding on any Agency.
This Recommendation is issued by, and represents the consensus of, the CCSDS Plenary
body. Agency endorsement of this Recommendation is entirely voluntary. Endorsement,
however, indicates the following understandings:
– Whenever an Agency establishes a CCSDS-related standard, this standard will be in
accord with the relevant Recommendation. Establishing such a standard does not
preclude other provisions which an Agency may develop.
– Whenever an Agency establishes a CCSDS-related standard, the Agency will provide
other CCSDS member Agencies with the following information:
• The standard itself.
• The anticipated date of initial operational capability.
• The anticipated duration of operational service.
– Specific service arrangements are made via memoranda of agreement. Neither this
Recommendation nor any ensuing standard is a substitute for a memorandum of
agreement.
No later than five years from its date of issuance, this Recommendation 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 Recommendation is issued, existing
CCSDS-related Agency standards and implementations are not negated or deemed to
be non-CCSDS compatible. It is the responsibility of each Agency to determine when
such standards or implementations are to be modified. Each Agency is, however,
strongly encouraged to direct planning for its new standards and implementations
towards the later version of the Recommendation.
CCSDS 133.0-B-1 Page ii September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
FOREWORD
This document is a technical Recommendation 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 Space Packet Protocol described herein is intended for
missions that are cross-supported between Agencies of the CCSDS.
This Recommendation specifies a communications protocol to be used by space missions to
transfer space application data over a network that involves a ground-to-space or space-to-
space communications link. This Recommendation was developed by consolidating the
specifications of the packet portion of three CCSDS Recommendations, references [B2]-
[B4], which define essentially the same protocol and services but in slightly different
contexts.
This Recommendation does not change the major technical contents defined in (references
[B2]-[B4]), but the presentation of the specification has been changed so that:
a) this protocol can be used to transfer any data over any space link in either direction;
b) all CCSDS space link protocols are specified in a unified manner;
c) the specification matches the Open Systems Interconnection (OSI) Basic Reference
Model (references [1] and [2]).
Together with the change in presentation, a few technical specifications in references [B2]-
[B4] have been changed in order to unify the specifications in references [B2]-[B4]. Also,
some technical terms in references [B2]-[B4] have been changed in order to unify the
terminology used in all the CCSDS Recommendations that define space link protocols and to
define this protocol as a general communications protocol. These changes are listed in annex
C of this Recommendation.
Through the process of normal evolution, it is expected that expansion, deletion or
modification to this document may occur. This Recommendation is therefore subject to
CCSDS document management and change control procedures, as defined in reference [B1].
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 133.0-B-1 Page iii September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
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.
– Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)/Germany.
– European Space Agency (ESA)/Europe.
– Instituto Nacional de Pesquisas Espaciais (INPE)/Brazil.
– National Aeronautics and Space Administration (NASA)/USA.
– National Space Development Agency of Japan (NASDA)/Japan.
– Russian Space Agency (RSA)/Russian Federation.
Observer Agencies
– Austrian Space Agency (ASA)/Austria.
– Central Research Institute of Machine Building (TsNIIMash)/Russian Federation.
– Centro Tecnico Aeroespacial (CTA)/Brazil.
– Chinese Academy of Space Technology (CAST)/China.
– Commonwealth Scientific and Industrial Research Organization (CSIRO)/Australia.
– Communications Research Laboratory (CRL)/Japan.
– Danish Space Research Institute (DSRI)/Denmark.
– European Organization for the Exploitation of Meteorological Satellites
(EUMETSAT)/Europe.
– European Telecommunications Satellite Organization (EUTELSAT)/Europe.
– Federal Service of Scientific, Technical & Cultural Affairs (FSST&CA)/Belgium.
– Hellenic National Space Committee (HNSC)/Greece.
– Indian Space Research Organization (ISRO)/India.
– Institute of Space and Astronautical Science (ISAS)/Japan.
– Institute of Space Research (IKI)/Russian Federation.
– KFKI Research Institute for Particle & Nuclear Physics (KFKI)/Hungary.
– MIKOMTEK: CSIR (CSIR)/Republic of South Africa.
– Korea Aerospace Research Institute (KARI)/Korea.
– Ministry of Communications (MOC)/Israel.
– National Oceanic & Atmospheric Administration (NOAA)/USA.
– National Space Program Office (NSPO)/Taipei.
– Space and Upper Atmosphere Research Commission (SUPARCO)/Pakistan.
– Swedish Space Corporation (SSC)/Sweden.
– United States Geological Survey (USGS)/USA.
CCSDS 133.0-B-1 Page iv September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
DOCUMENT CONTROL
Document Title and Issue Date Status
CCSDS 133.0-B-1 Space Packet Protocol, Issue 1 September Original Issue
2003
CCSDS 133.0-B-1 Page v September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
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 CONVENTIONS AND DEFINITIONS.1-2
1.7 REFERENCES.1-5
2 OVERVIEW.2-1
2.1 CONCEPT OF SPACE PACKET PROTOCOL .2-1
2.2 OVERVIEW OF SERVICES .2-4
2.3 OVERVIEW OF FUNCTIONS. 2-6
2.4 SERVICES ASSUMED FROM SUBNETWORKS .2-7
3 SERVICE DEFINITION.3-1
3.1 OVERVIEW.3-1
3.2 SOURCE DATA.3-1
3.3 PACKET SERVICE.3-2
3.4 OCTET STRING SERVICE .3-5
4 PROTOCOL SPECIFICATION.4-1
4.1 PROTOCOL DATA UNIT. 4-1
4.2 PROTOCOL PROCEDURES AT THE SENDING END.4-8
4.3 PROTOCOL PROCEDURES AT AN INTERMEDIATE SYSTEM.4-10
4.4 PROTOCOL PROCEDURES AT THE RECEIVING END.4-11
5 MANAGED PARAMETERS .5-1
5.1 OVERVIEW OF MANAGED PARAMETERS . 5-1
5.2 PROTOCOL CONFIGURATION PARAMETERS .5-1
5.3 ROUTING PARAMETERS.5-2
ANNEX A ACRONYMS. A-1
ANNEX B INFORMATIVE REFERENCES. B-1
ANNEX C CHANGES FROM REFERENCES [B2]-[B4]. C-1
CCSDS 133.0-B-1 Page vi September 2003
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CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
CONTENTS (continued)
Figure Page
1-1 Bit Numbering Convention. 1-4
2-1 Protocol Configuration . 2-1
2-2 Example of a Logical Data Path . 2-2
2-3 Internal Organization of Protocol Entity (Sending End) . 2-7
2-4 Internal Organization of Protocol Entity (Intermediate System). 2-7
2-5 Internal Organization of Protocol Entity (Receiving End). 2-7
4-1 Space Packet Structural Components . 4-1
4-2 Packet Primary Header . 4-2
4-3 Packet Secondary Header . 4-7
4-4 Internal Organization of Protocol Entity (Sending End) . 4-9
4-5 Internal Organization of Protocol Entity (Intermediate System). 4-10
4-6 Internal Organization of Protocol Entity (Receiving End). 4-11
Table
2-1 Summary of Services Provided by Space Packet Protocol. 2-5
5-1 Protocol Configuration Parameters. 5-1
5-2 Routing Parameters. 5-2
C-1 Terms That Have Been Changed from Reference [B2].C-2
C-2 Terms That Have Been Changed from Reference [B3].C-2
C-3 Terms That Have Been Changed from Reference [B4].C-3
CCSDS 133.0-B-1 Page vii September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
1 INTRODUCTION
1.1 PURPOSE
The purpose of this Recommendation is to specify the Space Packet Protocol. Space
missions will use this protocol to transfer space application data over a network that involves
a ground-to-space or space-to-space communications link.
1.2 SCOPE
This Recommendation defines the Space Packet Protocol in terms of:
a) the services provided to the users of this protocol;
b) the protocol data units employed by the protocol; and
c) the procedures performed by the protocol.
It does not specify:
a) individual implementations or products;
b) the implementation of service interfaces within real systems;
c) the methods or technologies required to perform the procedures; or
d) the management activities required to configure and control the protocol.
1.3 APPLICABILITY
This Recommendation applies to the creation of Agency standards and to future data
communications over space links between CCSDS Agencies in cross-support situations. The
Recommendation includes comprehensive specification of the services and protocol 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 Recommendation 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 Recommendation, is anticipated.
Where mandatory capabilities are clearly indicated in sections of the Recommendation, they
must be implemented 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.
CCSDS 133.0-B-1 Page 1-1 September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
1.4 RATIONALE
The CCSDS believes it is important to document the rationale underlying the
recommendations chosen, so that future evaluations of proposed changes or improvements
will not lose sight of previous decisions.
1.5 DOCUMENT STRUCTURE
This document is divided into five numbered sections and three annexes:
a) section 1 presents the purpose, scope, applicability, and rationale of this
Recommendation and lists the conventions, definitions, and references used
throughout the Recommendation;
b) section 2 provides an overview of the Space Packet Protocol;
c) section 3 defines the services provided by the protocol entity;
d) section 4 specifies the protocol data units and procedures employed by the protocol
entity;
e) section 5 lists the managed parameters associated with this protocol;
f) annex A lists all acronyms used within this document;
g) annex B provides a list of informative references;
h) annex C lists the changes from the older CCSDS Recommendations (references [B2]-
[B4]).
1.6 CONVENTIONS AND DEFINITIONS
1.6.1 DEFINITIONS
1.6.1.1 Definitions from the Open Systems Interconnection (OSI) Basic Reference
Model
This Recommendation makes use of a number of terms defined in reference [1]. The use of
those terms in this Recommendation 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) blocking;
b) connection;
c) entity;
d) flow control;
CCSDS 133.0-B-1 Page 1-2 September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
e) peer entities;
f) protocol control information;
g) protocol data unit;
h) real system;
i) segmenting;
j) service;
k) Service Access Point (SAP);
l) SAP address;
m) service data unit.
1.6.1.2 Definitions from OSI Service Definition Conventions
This Recommendation makes use of a number of terms defined in reference [2]. The use of
those terms in this Recommendation 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.
1.6.1.3 Terms Defined in this Recommendation
For the purposes of this Recommendation, the following definitions also apply. Many other
terms that pertain to specific items are defined in the appropriate sections.
asynchronous: not synchronous (see below).
delimited: having a known (and finite) length; applies to data in the context of data handling.
Mission Phase: a period of a mission during which specified communications
characteristics are fixed. The transition between two consecutive mission phases may cause
an interruption of the communications services.
Physical Channel: a stream of bits transferred over a space link in a single direction.
CCSDS 133.0-B-1 Page 1-3 September 2003
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ISO 22646:2005(E)
CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
space link: a communications link between a spacecraft and its associated ground system,
or between two spacecraft. A space link consists of one or more Physical Channels in one or
both directions.
synchronous: of or pertaining to a sequence of events occurring in a fixed time relationship
(within specified tolerance) to another sequence of events.
1.6.2 NOMENCLATURE
The following conventions apply throughout this Recommendation:
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.
1.6.3 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).
BIT N–1
BIT 0
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
eight-bit ‘words’ which conform to the above convention. Throughout this
Recommendation, such an eight-bit word is called an ‘octet’.
The numbering for octets within a data structure starts with zero.
By CCSDS convention, all ‘spare’ bits shall be permanently set to ‘0’.
CCSDS 133.0-B-1 Page 1-4 September 2003
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CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
1.7 REFERENCES
The following documents contain provisions which, through reference in this text, constitute
provisions of this Recommendation. At the time of publication, the editions indicated were
valid. All documents are subject to revision, and users of this Recommendation 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 Recommendations.
[1] Information Technology—Open Systems Interconnection—Basic Reference Model:
The Basic Model. International Standard, ISO/IEC 7498-1. 2nd ed. Geneva: ISO,
1994.
[2] Information Technology—Open Systems Interconnection—Basic Reference Model—
Conventions for the Definition of OSI Services. International Standard, ISO/IEC
10731:1994. Geneva: ISO, 1994.
[3] Time Code Formats. Recommendation for Space Data Systems Standards, CCSDS
301.0-B-3. Blue Book. Issue 3. Washington, D.C.: CCSDS, January 2002.
[4] Space Link Identifiers. Recommendation for Space Data System Standards, CCSDS
135.0-B-1. Blue Book. Issue 1. Washington, D.C.: CCSDS, January 2002.
NOTE – Informative references are listed in annex B.
CCSDS 133.0-B-1 Page 1-5 September 2003
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CCSDS RECOMMENDATION FOR SPACE PACKET PROTOCOL
2 OVERVIEW
2.1 CONCEPT OF SPACE PACKET PROTOCOL
2.1.1 ARCHITECTURE
The Space Packet Protocol is designed to meet the requirements of space missions to
efficiently transfer space application data of various types and characteristics over a network
that involves a ground-to-space or space-to-space communications link (hereafter called
space link).
Figure 2-1 illustrates where the Space Packet Protocol is located in the protocol stack. The
Space Packet Protocol provides a unidirectional data transfer service from a single source
user application to one or more destination
...
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