ISO 22671:2011
(Main)Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service
Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service
ISO 22671:2011 defines the Communications Link Transmission Unit (CLTU) service in conformance with the transfer services specified in CCSDS 910.4-B-2 (equivalent to ISO 15396). The Forward CLTU service is a Space Link Extension (SLE) transfer service that enables a mission to send Communications Link Transmission Units (CLTUs) to a spacecraft. ISO 22671:2011 defines, in an abstract manner, the Forward CLTU service in terms of the operations necessary to provide the transfer service, the parameter data associated with each operation, the behaviors that result from the invocation of each operation, and the relationship between, and the valid sequence of, the operations and resulting behaviors. ISO 22671:2011 does not specify individual implementations or products, the implementation of entities or interfaces within real systems, the methods or technologies required to radiate data to a spacecraft and to acquire telemetry frames from the signals received from that spacecraft for extraction of the Operational Control Field, the methods or technologies required for communications, or the management activities necessary to schedule, configure, and control the Forward CLTU service.
Systèmes de transfert des informations et données spatiales — Extension de liaisons spatiales (SLE) — Service de l'unité de transmission pour la liaison d'envoi de télécommande (CLTU)
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22671
Third edition
2011-11-15
Space data and information transfer
systems — Space link extension (SLE) —
Forward communications link
transmission unit (CLTU) service
Systèmes de transfert des informations et données spatiales —
Extension de liaisons spatiales (SLE) — Service de l'unité de
transmission pour la liaison d'envoi de télécommande (CLTU)
Reference number
ISO 22671:2011(E)
©
ISO 2011
---------------------- Page: 1 ----------------------
ISO 22671:2011(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2011 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22671:2011(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 22671 was prepared by the Consultative Committee for Space Data Systems (CCSDS) as
CCSDS 912.1-B-3, July 2010 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 third edition cancels and replaces the second edition (ISO 22671:2007), which has been technically
revised.
© ISO 2011 – All rights reserved iii
---------------------- Page: 3 ----------------------
INTERNATIONAL STANDARD ISO 22671:2011(E)
Space data and information transfer systems — Space link
extension (SLE) — Forward communications link transmission
unit (CLTU) service
1 Scope
1.1 This International Standard defines the Communications Link Transmission Unit (CLTU) service in
conformance with the transfer services specified in CCSDS 910.4-B-2 (equivalent to ISO 15396). The Forward
CLTU service is a Space Link Extension (SLE) transfer service that enables a mission to send
Communications Link Transmission Units (CLTUs) to a spacecraft.
1.2 This International Standard defines, in an abstract manner, the Forward CLTU service in terms of
a) the operations necessary to provide the transfer service,
b) the parameter data associated with each operation,
c) the behaviors that result from the invocation of each operation, and
d) the relationship between, and the valid sequence of, the operations and resulting behaviors.
1.3 It does not specify
a) individual implementations or products,
b) the implementation of entities or interfaces within real systems,
c) the methods or technologies required to radiate data to a spacecraft and to acquire telemetry frames from
the signals received from that spacecraft for extraction of the Operational Control Field,
d) the methods or technologies required for communications, or
e) the management activities necessary to schedule, configure, and control the Forward CLTU service.
1.4 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 912.1-B-3, July 2010, Space link extension — Forward CLTU service specification.
For the purposes of international standardization, the modifications outlined below shall apply to the specific
clauses and paragraphs of publication CCSDS 912.1-B-3.
© ISO 2011 – All rights reserved 1
---------------------- Page: 4 ----------------------
ISO 22671:2011(E)
Pages i to vi
This part is information which is relevant to the CCSDS publication only.
Page 1-12
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 231.0-B-1, September 2003, is equivalent to ISO 22642:2005.
[3] Document CCSDS 232.0-B-1, September 2003, is equivalent to ISO 22664:2005.
[4] Document CCSDS 232.1-B-1, September 2003, is equivalent to ISO 22667:2005.
[5] Document CCSDS 301.0-B-3, January 2002, is equivalent to ISO 11104:2003.
[6] ISO/IEC 8824-1:2002 has been cancelled and withdrawn. It has been replaced by
ISO/IEC 8824-1:2008, Information technology — Abstract Syntax Notation One (ASN.1): Specification
of basic notation.
Page G-1
Add the following information to the reference indicated:
[G4] Document CCSDS 201.0-B-3, June 2000, is equivalent to ISO 12171:2002.
[G5] Document CCSDS 202.0-B-3, June 2001, is equivalent to ISO 12172:2003.
[G6] Document CCSDS 202.1-B-2, June 2001, is equivalent to ISO 12173:2003.
[G7] Document CCSDS 203.0-B-2, June 2001, is equivalent to ISO 12174:2003.
3 Revision of publication CCSDS 912.1-B-3
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 912.1-B-3. To this end, NASA will act as a liaison body between CCSDS and ISO.
2 © ISO 2011 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 22671:2011(E)
Recommendation for Space Data System Standards
SPACE LINK EXTENSION—
FORWARD CLTU SERVICE
SPECIFICATION
RECOMMENDED STANDARD
CCSDS 912.1-B-3
BLUE BOOK
July 2010
© ISO 2011 – All rights reserved 3
---------------------- Page: 6 ----------------------
ISO 22671:2011(E)
(Blank page)
4 © ISO 2011 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
AUTHORITY
Issue: Recommended Standard, Issue 3
Date: July 2010
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 912.1-B-3 Page i July 2010
© ISO 2011 – All rights reserved 5
---------------------- Page: 8 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU 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 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 912.1-B-3 Page ii July 2010
6 © ISO 2011 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
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 912.1-B-3 Page iii July 2010
© ISO 2011 – All rights reserved 7
---------------------- Page: 10 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU 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 e.V. (DLR)/Germany.
– European Space Agency (ESA)/Europe.
– Instituto Nacional de Pesquisas Espaciais (INPE)/Brazil.
– Japan Aerospace Exploration Agency (JAXA)/Japan.
– National Aeronautics and Space Administration (NASA)/USA.
– Russian Federal Space Agency (RFSA)/Russian Federation.
– 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.
CCSDS 912.1-B-3 Page iv July 2010
8 © ISO 2011 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
– United States Geological Survey (USGS)/USA.
CCSDS 912.1-B-3 Page v July 2010
© ISO 2011 – All rights reserved 9
---------------------- Page: 12 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
DOCUMENT CONTROL
Document Title Date Status
CCSDS Space Link Extension—Forward April 2002 Original issue, superseded
912.1-B-1 CLTU Service Specification
CCSDS Space Link Extension—Forward November Issue 2, superseded
912.1-B-2 CLTU Service Specification 2004
CCSDS Space Link Extension—Forward July 2010 Current issue:
912.1-B-3 CLTU Service Specification, – corrects/clarifies/
Recommended Standard, Issue 3 updates text and adds
the option of
picosecond resolution
to the earth-receive-
time parameter
NOTE – Substantive changes from the previous issue are indicated by change bars in the
inside margin.
CCSDS 912.1-B-3 Page vi July 2010
10 © ISO 2011 – All rights reserved
---------------------- Page: 13 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
CONTENTS
Section Page
1 INTRODUCTION. 1-1
1.1 PURPOSE OF THIS RECOMMENDED STANDARD . 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 . 1-12
2 DESCRIPTION OF THE FORWARD CLTU SERVICE . 2-1
2.1 OVERVIEW . 2-1
2.2 SPACE LINK EXTENSION REFERENCE MODEL . 2-2
2.3 SERVICE MANAGEMENT . 2-3
2.4 ARCHITECTURE MODEL – FUNCTIONAL VIEW . 2-3
2.5 ARCHITECTURE MODEL – CROSS-SUPPORT VIEW . 2-6
2.6 FUNCTIONAL DESCRIPTION . 2-7
2.7 OPERATIONAL SCENARIO . 2-14
2.8 SECURITY ASPECTS OF THE SLE FORWARD CLTU
TRANSFER SERVICE . 2-16
3 FORWARD CLTU SERVICE OPERATIONS . 3-1
3.1 GENERAL CONSIDERATIONS . 3-1
3.2 CLTU-BIND . 3-8
3.3 CLTU-UNBIND . 3-14
3.4 CLTU-START . 3-18
3.5 CLTU-STOP . 3-22
3.6 CLTU-TRANSFER-DATA . 3-25
3.7 CLTU-ASYNC-NOTIFY . 3-33
3.8 CLTU-SCHEDULE-STATUS-REPORT . 3-39
3.9 CLTU-STATUS-REPORT . 3-43
3.10 CLTU-GET-PARAMETER . 3-48
3.11 CLTU-THROW-EVENT . 3-53
3.12 CLTU-PEER-ABORT . 3-58
CCSDS 912.1-B-3 Page vii July 2010
© ISO 2011 – All rights reserved 11
---------------------- Page: 14 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
CONTENTS (continued)
Section Page
4 CLTU PROTOCOL. 4-1
4.1 GENERIC PROTOCOL CHARACTERISTICS . 4-1
4.2 CLTU SERVICE PROVIDER BEHAVIOR . 4-4
ANNEX A DATA TYPE DEFINITIONS (NORMATIVE) . A-1
ANNEX B PRODUCTION STATUS (NORMATIVE) .B-1
ANNEX C CONFORMANCE OPTIONS MATRIX (NORMATIVE) . C-1
ANNEX D INDEX TO DEFINITIONS (INFORMATIVE) . D-1
ANNEX E ACRONYMS (INFORMATIVE) .E-1
ANNEX F THROW EVENT DEFINITIONS (INFORMATIVE) . F-1
ANNEX G INFORMATIVE REFERENCES (INFORMATIVE) . G-1
Figure
1-1 SLE Services Documentation . 1-4
2-1 SLE Services Documentation . 2-4
2-2 Forward CLTU Service Production and Provision . 2-5
2-3 Example of Management and Provision of Forward CLTU Service . 2-6
2-4 Simplified Forward CLTU Service Provider State Transition Diagram . 2-9
2-5 Communications Realization of Forward CLTU Service . 2-12
B-1 CLTU Production Status Transitions . B-1
Table
2-1 Forward CLTU Service Operations . 2-8
3-1 Setting of Forward CLTU Service Configuration Parameters . 3-6
3-2 CLTU-BIND Parameters . 3-9
3-3 CLTU-UNBIND Parameters . 3-15
3-4 CLTU-START Parameters . 3-18
3-5 CLTU-STOP Parameters . 3-22
3-6 CLTU-TRANSFER-DATA Parameters . 3-25
3-7 CLTU-ASYNC-NOTIFY Parameters . 3-33
3-8 CLTU-SCHEDULE-STATUS-REPORT Parameters . 3-39
3-9 CLTU-STATUS-REPORT Parameters . 3-43
3-10 CLTU-GET-PARAMETER Parameters . 3-48
3-11 Forward CLTU Parameters . 3-50
3-12 CLTU-THROW-EVENT Parameters . 3-54
3-13 CLTU-PEER-ABORT Parameters . 3-58
CCSDS 912.1-B-3 Page viii July 2010
12 © ISO 2011 – All rights reserved
---------------------- Page: 15 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
CONTENTS (continued)
Table Page
4-1 Provider Behavior . 4-7
4-2 Event Description References . 4-10
4-3 Predicate Definitions . 4-10
4-4 Boolean Flags. 4-11
4-5 Compound Action Definitions . 4-11
B-1 Production Status Changes and Notifications . B-2
B-2 Effect of Production Status on Operations . B-4
C-1 Conformance Matrix for CLTU Service (Operations) .C-1
C-2 Conformance Matrix for CLTU Service (Other Requirements) .C-1
F-1 Throw Event Examples . F-1
CCSDS 912.1-B-3 Page ix July 2010
© ISO 2011 – All rights reserved 13
---------------------- Page: 16 ----------------------
ISO 22671:2011(E)
(Blank page)
14 © ISO 2011 – All rights reserved
---------------------- Page: 17 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
1 INTRODUCTION
1.1 PURPOSE OF THIS RECOMMENDED STANDARD
This Recommended Standard defines the Communications Link Transmission Unit (CLTU)
service in conformance with the transfer services specified in reference [1], Cross Support
Reference Model—Part 1: SLE Services. The Forward CLTU service is a Space Link
Extension (SLE) transfer service that enables a mission to send Communications Link
Transmission Units (CLTUs) to a spacecraft.
1.2 SCOPE
This Recommended Standard defines, in an abstract manner, the Forward CLTU service in
terms of:
a) the operations necessary to provide the transfer service;
b) the parameter data associated with each operation;
c) the behaviors that result from the invocation of each operation; and
d) the relationship between, and the valid sequence of, the operations and resulting
behaviors.
It does not specify:
a) individual implementations or products;
b) the implementation of entities or interfaces within real systems;
c) the methods or technologies required to radiate data to a spacecraft and to acquire
telemetry frames from the signals received from that spacecraft for extraction of the
Operational Control Field;
d) the methods or technologies required for communications; or
e) the management activities necessary to schedule, configure, and control the Forward
CLTU service.
1.3 APPLICABILITY
1.3.1 APPLICABILITY OF THIS RECOMMENDED STANDARD
This Recommended Standard provides a basis for the development of real systems that
implement the Forward CLTU service. Implementation of the Forward CLTU service in a
real system additionally requires the availability of a communications service to convey
invocations and returns of Forward CLTU service operations between service users and
CCSDS 912.1-B-3 Page 1-1 July 2010
© ISO 2011 – All rights reserved 15
---------------------- Page: 18 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
providers. This Recommended Standard requires that such a communications service ensure
that invocations and returns of operations are transferred:
a) in sequence;
b) completely and with integrity;
c) without duplication;
d) with flow control that notifies backpressure to the application layer in the event of
congestion; and
e) with notification to the application layer in the event that communications between
the Forward CLTU service user and the Forward CLTU service provider are
disrupted, possibly resulting in a loss of data.
It is the specific intent of this Recommended Standard to define the Forward CLTU service in
a manner that is independent of any particular communications services, protocols, or
technologies.
1.3.2 LIMITS OF APPLICABILITY
This Recommended Standard specifies the Forward CLTU service that may be provided by
an SLE System for inter-Agency cross support. It is neither a specification of, nor a design
for, real systems that may be implemented for the control and monitoring of existing or future
missions.
1.4 RATIONALE
The goal of this Recommended Standard is to create a standard for interoperability between
the tracking stations or ground data handling systems of various agencies and the users of
forward services.
1.5 DOCUMENT STRUCTURE
1.5.1 DOCUMENT ORGANIZATION
This Recommended Standard is organized as follows:
a) section 1 provides purpose, scope, applicability, and rationale of this Recommended
Standard and lists definitions, nomenclature, conventions, and references used
throughout the Recommended Standard;
b) section 2 presents an overview of the Forward CLTU service including a functional
description, the service management context, and protocol considerations;
c) section 3 specifies the operations of the Forward CLTU service;
CCSDS 912.1-B-3 Page 1-2 July 2010
16 © ISO 2011 – All rights reserved
---------------------- Page: 19 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
d) section 4 specifies the dynamic behavior of the Forward CLTU service in terms of the
state transitions of the Forward CLTU service provider;
e) annex A is a formal specification of Forward CLTU service data types, using the
Abstract Syntax Notation One (ASN.1);
f) annex B explains the relationship of the Forward CLTU service provisioning on the
production status and its dependency on the status of the forward space link channel.
g) annex C provides a conformance matrix that defines what capabilities must be
provided for an implementation to be considered compliant with this Recommended
Standard;
h) annex D lists all terms used in this document and identifies where they are defined;
i) annex E lists all acronyms used within this document;
j) annex F contains examples of usage of the CLTU-THROW-EVENT operation;
k) annex G contains a list of informative references.
1.5.2 SLE SERVICES DOCUMENTATION TREE
This Recommended Standard is based on the architectural model for cross support defined in
reference [1]. It expands upon the concept of an SLE transfer service as interactions between
SLE Mission User Entities (MUEs) and an SLE transfer service provider for the purpose of
providing the Forward CLTU transfer service.
This Recommended Standard is part of a suite of documents specifying the SLE Services.
The SLE Services constitute one of the three types of Cross Support Services:
a) Part 1: SLE Services;
b) Part 2: Ground Communications Services;
c) Part 3: Ground Domain Services.
The basic organization of the SLE services documentation is shown in figure 1-1. The
documents are described in the following paragraphs.
CCSDS 912.1-B-3 Page 1-3 July 2010
© ISO 2011 – All rights reserved 17
---------------------- Page: 20 ----------------------
ISO 22671:2011(E)
CCSDS RECOMMENDED STANDARD FOR SLE FCLTU SERVICE
Space Link Extension
Cross Support
Cross Support Concept SLE Executive
Reference Model
Part 1: SLE Services Summary
Part 1: SLE Services
SLE Transfer Services
SLE Transfer Services
Forward SLE Service
Return SLE Se
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.