ISO 15893:2010

INTERNATIONAL ISO
STANDARD 15893
Second edition
2010-09-15
Space data and information transfer
systems — Space communications
protocol specification (SCPS) —
Transport protocol (SCPS-TP)
Systèmes de transfert des informations et données spatiales —
Spécification de protocole pour communications spatiales (SCPS) —
Protocole de transport (SCPS-TP)

Reference number
©
ISO 2010
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©  ISO 2010
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ii © ISO 2010 – 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.
This second edition cancels and replaces the first edition (ISO 15893:2000), which has been technically
revised.
ISO 15893 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as
CCSDS 714.0-B-2, October 2006) 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.

INTERNATIONAL STANDARD ISO 15893:2010(E)

Space data and information transfer systems — Space
communications protocol specification (SCPS) — Transport
protocol (SCPS-TP)
1 Scope
This International Standard specifies the requirements for the services and protocols of the space
communications protocol specification (SCPS) transport service. These requirements are meant to allow
independent implementations of this protocol in space and ground segments of the SCPS network to
interoperate.
This International Standard is applicable to any kind of space mission or infrastructure, regardless of
complexity.
The scope and field of application are further detailed in subclauses 1.2 and 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 714.0-B-2, October 2006, Space communications protocol specification (SCPS) — Transport protocol
(SCPS-TP)
For the purposes of international standardization, the modifications outlined below shall apply to the specific
clauses and paragraphs of publication CCSDS 714.0-B-2.
Pages i to v
This part is information which is relevant to the CCSDS publication only.
Page 1-8
Add the following information to the reference indicated:
[10] Document CCSDS 713.0-B-1, May 1999, is equivalent to ISO 15891:2000.
[11] Document CCSDS 713.5-B-1, May 1999, is equivalent to ISO 15892:2000.
3 Revision of publication CCSDS 714.0-B-2
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 714.0-B-2. To this end, NASA will act as a liaison body between CCSDS and ISO.
(blank page)
2 © ISO 2010 – All rights reserved

Recommendation for Space Data System Standards
SPACE COMMUNICATIONS
PROTOCOL SPECIFICATION (SCPS)—
TRANSPORT PROTOCOL
(SCPS-TP)
RECOMMENDED STANDARD
CCSDS 714.0-B-2
BLUE BOOK
October 2006
(blank page)
4 © ISO 2010 – All rights reserved

CCSDS RECOMMENDED STANDARD FOR SCPS TRANSPORT PROTOCOL (SCPS-TP)
AUTHORITY
Issue: Recommended Standard, Issue 2
Date: October 2006
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 Recommendations 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
Office of Space Communication (Code M-3)
National Aeronautics and Space Administration
Washington, DC 20546, USA
CCSDS 714.0-B-2 Page i October 2006
CCSDS RECOMMENDED STANDARD FOR SCPS TRANSPORT PROTOCOL (SCPS-TP)
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 five 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 714.0-B-2 Page ii October 2006
6 © ISO 2010 – All rights reserved

CCSDS RECOMMENDED STANDARD FOR SCPS TRANSPORT PROTOCOL (SCPS-TP)
FOREWORD
Through the process of normal evolution, it is expected that expansion, deletion, or
modification of 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 714.0-B-2 Page iii October 2006
CCSDS RECOMMENDED STANDARD FOR SCPS TRANSPORT PROTOCOL (SCPS-TP)
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.
– Federal Space Agency (Roskosmos)/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 Space Technology (CAST)/China.
– Commonwealth Scientific and Industrial Research Organization (CSIRO)/Australia.
– Danish Space Research Institute (DSRI)/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 & Atmospheric Administration (NOAA)/USA.
– National Space Organization (NSPO)/Taipei.
– Space and Upper Atmosphere Research Commission (SUPARCO)/Pakistan.
– Swedish Space Corporation (SSC)/Sweden.
– United States Geological Survey (USGS)/USA.

CCSDS 714.0-B-2 Page iv October 2006
8 © ISO 2010 – All rights reserved

CCSDS RECOMMENDED STANDARD FOR SCPS TRANSPORT PROTOCOL (SCPS-TP)
DOCUMENT CONTROL
Document Title Date Status
CCSDS Space Communications May Original issue, superseded
714.0-B-1 Protocol Specification 1999
(SCPS)—Transport Protocol
(SCPS-TP)
CCSDS Space Communications October Current issue:
714.0-B-2 Protocol Specification 2006 – adds optional support for
(SCPS)—Transport Protocol Selective Acknowledgements
(SACK) and Explicit
(SCPS-TP), Recommended
Congestion Notification
Standard, Issue 2
(ECN);
– defines semantics to extend
SCPS-TP signaling to allow
optional inclusion of vendor-
and community-specific
options;
– clarifies some ambiguities in
the original specification
regarding:
• inclusion/position of
compressed short-form
SNACK options in
compressed SCPS-TP
headers (the position of the
compressed SNACK option
within the header is given);
• what connection identifier is
transmitted in compressed
headers (the one sent to the
peer during the SYN
exchange);
• what N-user protocol ID is
used to calculate the pseudo
header checksum when
header compression is in
use (decimal 105).
NOTE – Revision bars in the inside margin indicate changes from the previous issue.
CCSDS 714.0-B-2 Page v October 2006
CCSDS RECOMMENDED STANDARD FOR SCPS TRANSPORT PROTOCOL (SCPS-TP)
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.1-1
1.5 ORGANIZATION OF THIS RECOMMENDATION. 1-1
1.6 HOW TO READ THIS DOCUMENT .
...