Space data and information transfer systems -- Space link extension (SLE) -- Return-channel-frames service

ISO 22670:2013 defines the space link extension (SLE) return-channel-frames (RCF) service in accordance with the SLE Reference Model (ISO 15396:2007). The RCF service is an SLE transfer service that delivers to a mission user all telemetry frames from one master channel or one virtual channel. ISO 22670:2013 defines the RCF service in terms of the operations necessary to provide the 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. It does not specify individual implementations or products, the implementation of entities or interfaces within real systems, the methods or technologies required to acquire telemetry frames from signals received from a spacecraft, the methods or technologies required to provide a suitable environment for communications, or the management activities required to schedule, configure, and control the RCF service.

Systèmes de transfert des informations et données spatiales -- Extension de liaisons spatiales (SLE) -- Service de réseau pour liaison retour

General Information

Status
Published
Publication Date
28-May-2013
Current Stage
6060 - International Standard published
Start Date
22-May-2013
Completion Date
29-May-2013
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INTERNATIONAL ISO
STANDARD 22670
Second edition
2013-06-01
Space data and information transfer
systems — Space link extension (SLE) —
Return-channel-frames service
Systèmes de transfert des informations et données spatiales —
Extension de liaisons spatiales (SLE) — Service de réseau pour liaison
retour
Reference number
ISO 22670:2013(E)
ISO 2013
---------------------- Page: 1 ----------------------
ISO 22670:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any

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Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester.

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Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22670:2013(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.

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 22670 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as

CCSDS 911.2-B-2, January 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 second edition cancels and replaces the first edition (ISO 22670:2006), which has been technically

revised.
© ISO 2013 – All rights reserved iii
---------------------- Page: 3 ----------------------
INTERNATIONAL STANDARD ISO 22670:2013(E)
Space data and information transfer systems — Space link
extension (SLE) — Return-channel-frames service
1 Scope

1.1 This International Standard defines the space link extension (SLE) return-channel-frames (RCF) service

in accordance with the SLE Reference Model (CCSDS 910.4-B-2). The RCF service is an SLE transfer

service that delivers to a mission user all telemetry frames from one master channel or one virtual channel.

1.2 This International Standard defines the RCF service in terms of
a) the operations necessary to provide the 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 acquire telemetry frames from signals received from a

spacecraft,

d) the methods or technologies required to provide a suitable environment for communications, or

e) the management activities required to schedule, configure, and control the RCF service.

1.4 The scope and field of application are furthermore detailed in subclauses 1.1, 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 911.2-B-2, January 2010, Space link extension — Return channel frames service specification.

For the purposes of international standardization, the modifications outlined below shall apply to the specific

clauses and paragraphs of publication CCSDS 911.2-B-2.
Pages i to vi
This part is information which is relevant to the CCSDS publication only.
© ISO 2013 – All rights reserved 1
---------------------- Page: 4 ----------------------
ISO 22670:2013(E)
Pages 1-14 to 1-15
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 131.0-B-1, September 2003, is equivalent to ISO 22641:2005.
[3] Document CCSDS 132.0-B-1, September 2003, is equivalent to ISO 22645:2005.
[4] Document CCSDS 732.0-B-2, July 2006, is equivalent to ISO 22666:2007.
[5] Document CCSDS 301.0-B-3, January 2002, is equivalent to ISO 11104:2003.
[7] ISO/IEC 8824-1:2002 has been cancelled and replaced by ISO/IEC 8824-1:2008.
Page E-1
Add the following information to the reference indicated:
[E4] Document CCSDS 102.0-B-5-S, November 2000, is equivalent to ISO 13419:2003.
[E6] Document CCSDS 913.1-B-1, September 2008, is equivalent to ISO 18440:2013.
3 Revision of publication CCSDS 911.2-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 911.2-

B-2. To this end, NASA will act as a liaison body between CCSDS and ISO.
ISO 11104:2003 has been cancelled and replaced by ISO 11104:2011.
2 © ISO 2013 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 22670:2013(E)
Recommendation for Space Data System Standards
SPACE LINK EXTENSION—
RETURN CHANNEL
FRAMES SERVICE
SPECIFICATION
RECOMMENDED STANDARD
CCSDS 911.2-B-2
BLUE BOOK
January 2010
© ISO 2013 – All rights reserved
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ISO 22670:2013(E)
(Blank page)
© ISO 2013 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF SERVICE
AUTHORITY
Issue: Recommended Standard, Issue 2
Date: January 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 911.2-B-2 Page i January 2010
© ISO 2013 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF 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 911.2-B-2 Page ii January 2010
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ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF 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 911.2-B-2 Page iii January 2010
© ISO 2013 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF 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.
– Russian Federal Space Agency (RFSA)/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.

– CSIR Satellite Applications Centre (CSIR)/Republic of South Africa.
– Danish National Space Center (DNSC)/Denmark.
– 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 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 911.2-B-2 Page iv January 2010
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ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF SERVICE
– United States Geological Survey (USGS)/USA.
CCSDS 911.2-B-2 Page v January 2010
© ISO 2013 – All rights reserved
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ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF SERVICE
DOCUMENT CONTROL
Document Title Date Status
CCSDS Space Link Extension— November Original issue, superseded
911.2-B-1 Return Channel Frames Service 2004
Specification
CCSDS Space Link Extension—Return January Current issue:
911.2-B-2 Channel Frames Service 2010 – corrects/clarifies/
Specification, Recommended updates text and adds
Standard, Issue 2 the option of
picosecond resolution
to the earth-receive-
time parameter.
EC1 Editorial Change 1 August Corrects editorial errors in
2010 A2.4.

NOTE – Substantive changes from the previous issue are indicated by change bars in the

inside margin.
CCSDS 911.2-B-2 Page vi JAanuguausryt 2010 2010
© ISO 2013 – All rights reserved
---------------------- Page: 13 ----------------------
ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF 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 ................................................................................................... 1-2

1.4 RATIONALE .......................................................................................................... 1-2

1.5 DOCUMENT STRUCTURE ................................................................................. 1-2

1.6 DEFINITIONS, NOMENCLATURE, AND CONVENTIONS ............................. 1-5

1.7 REFERENCES ..................................................................................................... 1-14

2 DESCRIPTION OF THE RETURN CHANNEL FRAMES 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 .......................................... 2-4

2.5 ARCHITECTURE MODEL—CROSS SUPPORT VIEW .................................... 2-7

2.6 FUNCTIONAL DESCRIPTION ............................................................................ 2-8

2.7 OPERATIONAL SCENARIO .............................................................................. 2-18

2.8 SECURITY ASPECTS OF THE SLE RCF TRANSFER SERVICE .................. 2-19

3 RCF SERVICE OPERATIONS ................................................................................... 3-1

3.1 GENERAL CONSIDERATIONS .......................................................................... 3-1

3.2 RCF-BIND ............................................................................................................ 3-14

3.3 RCF-UNBIND ...................................................................................................... 3-20

3.4 RCF-START ......................................................................................................... 3-24

3.5 RCF-STOP ............................................................................................................ 3-30

3.6 RCF-TRANSFER-DATA ..................................................................................... 3-32

3.7 RCF-SYNC-NOTIFY ........................................................................................... 3-35

3.8 RCF-SCHEDULE-STATUS-REPORT ................................................................ 3-39

3.9 RCF-STATUS-REPORT ...................................................................................... 3-43

3.10 RCF-GET-PARAMETER .................................................................................... 3-46

3.11 RCF-PEER-ABORT ............................................................................................. 3-50

4 RCF PROTOCOL ......................................................................................................... 4-1

4.1 GENERIC PROTOCOL CHARACTERISTICS .................................................... 4-1

4.2 RCF SERVICE PROVIDER BEHAVIOR ............................................................. 4-4

CCSDS 911.2-B-2 Page vii January 2010
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ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF SERVICE
CONTENTS (continued)
Section Page

ANNEX A DATA TYPE DEFINITIONS (NORMATIVE) ........................................... A-1

ANNEX B CONFORMANCE MATRIX (NORMATIVE) .............................................B-1

ANNEX C INDEX TO DEFINITIONS (INFORMATIVE) .......................................... C-1

ANNEX D ACRONYMS (INFORMATIVE) .................................................................. D-1

ANNEX E INFORMATIVE REFERENCES (INFORMATIVE) ..................................E-1

Figure

1-1 SLE Services Documentation ....................................................................................... 1-4

2-1 Return Frame Processing SLE-FG ................................................................................ 2-4

2-2 RCF Service Production and Provision ........................................................................ 2-7

2-3 Example of the Management and Provision of RCF Service ....................................... 2-8

2-4 Simplified RCF Service Provider State Transition Diagram ...................................... 2-11

2-5 Communications Realization of RCF Service ............................................................ 2-13

2-6 Buffers and Delivery Modes ....................................................................................... 2-18

Table

2-1 RCF Operations ............................................................................................................ 2-9

3-1 Setting of RCF Service Configuration Parameters ....................................................... 3-6

3-2 RCF-BIND Parameters ............................................................................................... 3-15

3-3 RCF-UNBIND Parameters ......................................................................................... 3-21

3-4 RCF-START Parameters ............................................................................................ 3-25

3-5 RCF-STOP Parameters ............................................................................................... 3-30

3-6 RCF-TRANSFER-DATA Parameters ........................................................................ 3-32

3-7 RCF-SYNC-NOTIFY Parameters .............................................................................. 3-35

3-8 RCF-SCHEDULE-STATUS-REPORT Parameters ................................................... 3-40

3-9 RCF-STATUS-REPORT Parameters ......................................................................... 3-43

3-10 RCF-GET-PARAMETER Parameters ....................................................................... 3-46

3-11 RCF Parameters .......................................................................................................... 3-48

3-12 RCF-PEER-ABORT Parameters ................................................................................ 3-50

4-1 Provider Behavior ......................................................................................................... 4-6

4-2 Event Description References ..................................................................................... 4-12

4-3 Predicate Descriptions ................................................................................................ 4-12

4-4 Boolean Flags.............................................................................................................. 4-13

4-5 Compound Action Definitions .................................................................................... 4-13

B-1 Conformance Matrix for RCF Service (Operations) .................................................... B-1

B-2 Conformance Matrix for RCF Service (Other Requirements) ...................................... B-2

CCSDS 911.2-B-2 Page viii January 2010
© ISO 2013 – All rights reserved
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ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF SERVICE
1 INTRODUCTION
1.1 PURPOSE OF THIS RECOMMENDED STANDARD

The purpose of this Recommended Standard is to define the Space Link Extension (SLE)

Return Channel Frames (RCF) service in conformance with the SLE Reference Model

(reference [1]). The RCF service is an SLE transfer service that delivers to a mission user all

telemetry frames from one master channel or one virtual channel.

NOTE – The first issue of reference [1] defines the Return Master Channel Frames (Rtn

MC Frames) service and the Return Virtual Channel Frames (Rtn VC Frames)
service as two distinct services. Subsequent study has indicated that it is

preferable to define one service that provides the functionality of both. The RCF

service defined here does just that. It is anticipated that the next issue of
reference [1] will take the same approach, deleting the Rtn MC Frames and Rtn
VC Frames services and replacing them with the RCF service.
1.2 SCOPE

This Recommended Standard defines, in an abstract manner, the RCF service in terms of:

a) the operations necessary to provide the 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 acquire telemetry frames from signals
received from a spacecraft;
d) the methods or technologies required to provide a suitable environment for
communications; or

e) the management activities required to schedule, configure, and control the RCF service.

CCSDS 911.2-B-2 Page 1-1 January 2010
© ISO 2013 – All rights reserved
---------------------- Page: 16 ----------------------
ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF 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 RCF service. Implementation of the RCF service in a real system additionally

requires the availability of a communications service to convey invocations and returns of

RCF service operations between RCF service users and providers. This Recommended

Standard requires that such a communications service must 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 the application layer in the event of congestion; and

e) with notification to the application layer in the event that communications between

the RCF service user and the RCF service provider are disrupted, possibly resulting in

a loss of data.

It is the specific intent of this Recommended Standard to define the RCF 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 RCF service that may be provided by an SLE

Complex 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 consumers

of spacecraft telemetry.
1.5 DOCUMENT STRUCTURE
1.5.1 ORGANIZATION
This document is organized as follows:
CCSDS 911.2-B-2 Page 1-2 January 2010
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ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF SERVICE
a) section 1 presents the purpose, scope, applicability and rationale of this
Recommended Standard and lists the definitions, conventions, and references used
throughout the Recommended Standard;

b) section 2 provides an overview of the RCF service including a functional description,

the service management context, and protocol considerations;
c) section 3 specifies the operations of the RCF service;

d) section 4 specifies the dynamic behavior of the RCF service in terms of the state

transitions of the RCF service provider;

e) annex A provides a formal specification of RCF service data types using Abstract

Syntax Notation One (ASN.1);
f) annex B provides a conformance matrix that defines what capabilities must be
provided for an implementation to be considered compliant with this Recommended
Standard;

g) annex C lists all terms used in this Recommended Standard and identifies where they

are defined;
h) annex D lists all acronyms used within this document;
i) annex E provides a list of informative references.
1.5.2 SLE SERVICES DOCUMENTATION TREE
This Recommended Standard is based on the cross support model defined in the SLE

Reference Model (reference [1]). It expands upon the concept of an SLE transfer service as

an interaction between an SLE Mission User Entity (MUE) and an SLE transfer service

provider for the purpose of providing the RCF 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 Domain Services;
c) Part 3: Ground Communications Services.

The basic organization of the SLE services documentation is shown in figure 1-1. The

various documents are described in the following subsections.
CCSDS 911.2-B-2 Page 1-3 January 2010
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ISO 22670:2013(E)
CCSDS RECOMMENDED STANDARD FOR SLE RCF 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 Service
Specifications
Specifications
SLE Service
Management Suite
SLE API for Internet Protocol for
Transfer Services Transfer Services
Recommended Recommended Informational
Legend:
Record (Yellow)
Standard (Blue) Practice (Magenta) Report (Green)
Figure 1-1: SLE Services Documentation

a) Cross Support Concept—Part 1: Space Link Extension Services (reference [E2]): a

Report introducing the concepts of cross support and the SLE services;

b) Cross Support Reference Model—Part 1: Space Link Extension Services (reference

[1]): a Recommended Standard that defines the framework and terminology for the
specification of SLE services;
c) SLE Return Service Specifications: a set of Recommended Standards that will

provide specification of all return link SLE services (this Recommended Standard is

one of the specifications in that set);
d) SLE Forward Service Specifications: a set of Recommended Standards that will
provide specification of all forward link SLE services;

e) SLE API for Transfer Services Specifications: a set of Recommended Practices that

provide specifications of an Application Program Interface; a set of Recommended
Standards that provide specifications of an Application Program Interface and a
mapping to TCP/IP as underlying communications service for SLE services;

f) Internet Protocol for Transfer Services: defines a protocol for transfer of SLE

Protocol Data Units using TCP/IP as underlying communications service for SLE
services;
g) SLE Service Management Specifications: a set of Recommended Standards that
estab
...

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