SIST EN 61158-3-21:2012
(Main)Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements (IEC 61158-3-21:2010)
Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements (IEC 61158-3-21:2010)
IEC 61158-3-21:2010 defines in an abstract way the externally visible service provided by the Type 21 fieldbus data-link layer in terms of the primitive actions and events of the service; the parameters associated with each primitive action and event, and the form which they take and the interrelationship between these actions and events, and their valid sequences. It cancels and replaces the IEC/PAS 62573 published in 2008. This bilingual version published in 2012-01 corresponds to the English version published in 2010-08.
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-21: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) - Typ 21-Elemente (IEC 61158-3-21:2010)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-21: Définition des services de couche liaison de données - Eléments de Type 21 (IEC 61158-3-21:2010)
La CEI 61158-3-21:2010 définit de manière abstraite le service visible de l'extérieur fourni par la couche liaison de données de bus de terrain Type 21 en termes des actions et événements primitifs du service; des paramètres associés à chaque action primitive et événement primitif, et la forme qu'ils prennent; et des interrelations entre ces actions et événements, et leurs séquences valides. La présente norme annule et remplace la CEI/PAS
62573 parue en 2008. La présente version bilingue publiée en
2012-01 correspond à la version anglaise monolingue publiée en
2010-08.
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-21. del: Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 21 (IEC 61158-3-21:2010)
Ta del standarda IEC 61158 določa skupne elemente za osnovne časovno kritične sporočilne komunikacije med napravami v avtomatizacijskem okolju. Izraz »časovno kritičen« v tem okviru pomeni prednostno časovno deterministično komunikacijo brez kolizije in s popolnim dupleksiranjem, v okviru katere se zahteva dokončanje enega ali več določenih dejanj z določeno stopnjo gotovosti. Zaradi neuspešnega dokončanja določenih dejanj v zahtevanem času je možna odpoved aplikacij, ki zahtevajo dejanja, pri čemer so ogroženi oprema, obrat in morda človeška življenja. Ta standard na abstrakten način določa zunanje vidno opravilo, ki ga zagotavlja nivo podatkovnih povezav tipa 21 v zvezi z a) primitivnimi dejanji in dogodki opravila; b) parametri, povezanimi z vsakim primitivnim dejanjem in dogodkom, in obliko, ki jo prevzamejo; ter c) medsebojno povezavo med temi dejanji in dogodki ter njihovimi veljavnimi zaporedji. Namen tega standarda je določiti opravila, ki se zagotavljajo za: – aplikacijski nivo tipa 21 na meji med aplikacijskim nivojem in nivojem podatkovnih povezav referenčnega modela procesnih vodil; – vodenje sistemov na meji med nivojem podatkovnih povezav in vodenje sistemov referenčnega modela procesnih vodil. Specifikacije. Glavni cilj tega standarda je določiti značilnosti konceptualnih opravil na nivoju podatkovnih povezav, primernih za časovno kritične komunikacije, ter dopolniti osnovni referenčni model OSI pri usmerjanju razvoja protokolov časovnih povezav za časovno kritične komunikacije. Drugotni cilj je zagotoviti načrte prehoda iz predhodno obstoječih industrijskih komunikacijskih protokolov. Ta standard se lahko uporablja kot podlaga za formalne programske vmesnike podatkovne povezave. Vseeno ne gre za formalni programski vmesnik in vsak tak vmesnik mora obravnavati izvedbena vprašanja, ki jih ta standard ne zajema, vključno z: a) velikostmi in oktetnim naročanjem različnih večoktetnih parametrov opravil; b) korelacijo parnih primitivov za zahtevo in potrjevanje ali navedbo in odziv.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61158-3-21:2012
01-julij-2012
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-21. del:
Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 21 (IEC 61158-3-
21:2010)
Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer
service definition - Type 21 elements (IEC 61158-3-21:2010)
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-21: Dienstfestlegungen des Data
Link Layer (Sicherungsschicht) - Typ 21-Elemente (IEC 61158-3-21:2010)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-21:
Définition des services de couche liaison de données - Eléments de Type 21 (IEC 61158
-3-21:2010)
Ta slovenski standard je istoveten z: EN 61158-3-21:2012
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.100.20 Podatkovni povezovalni sloj Data link layer
35.110 Omreževanje Networking
SIST EN 61158-3-21:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61158-3-21:2012
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SIST EN 61158-3-21:2012
EUROPEAN STANDARD
EN 61158-3-21
NORME EUROPÉENNE
May 2012
EUROPÄISCHE NORM
ICS 25.040.40; 35.100.20; 35.110
English version
Industrial communication networks -
Fieldbus specifications -
Part 3-21: Data-link layer service definition -
Type 21 elements
(IEC 61158-3-21:2010)
Réseaux de communication industriels - Industrielle Kommunikationsnetze -
Spécifications des bus de terrain - Feldbusse -
Partie 3-21: Définition des services de Teil 3-19: Dienstfestlegungen des Data
couche liaison de données - Link Layer (Sicherungsschicht) -
Eléments de Type 21 Typ 21-Elemente
(CEI 61158-3-21:2010) (IEC 61158-3-21:2010)
This European Standard was approved by CENELEC on 2012-03-28. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61158-3-21:2012 E
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SIST EN 61158-3-21:2012
EN 61158-3-21:2012 - 2 -
Foreword
The text of document 65C/604/FDIS, future edition 1 of IEC 61158-3-21, prepared by SC 65C, "Industrial
networks", of IEC/TC 65, "Industrial-process measurement, control and automation" was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN 61158-3-21:2012.
The following dates are fixed:
(dop) 2012-12-28
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-03-28
• latest date by which the national
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 61158-3-21:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC/TR 61158-1:2010 NOTE Harmonized as CLC/TR 61158-1:2010 (not modified).
IEC 61158-5-21:2010 NOTE Harmonized as EN 61158-5-21:2012 (not modified).
IEC 61158-6-21:2010 NOTE Harmonized as EN 61158-6-21:2012 (not modified).
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SIST EN 61158-3-21:2012
- 3 - EN 61158-3-21:2012
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 61158-2 2010 Industrial communication networks - Fieldbus EN 61158-2 2010
specifications -
Part 2: Physical layer specification and service
definition
IEC 61158-4-21 2010 Industrial communication networks - Fieldbus EN 61158-4-21 2012
specifications -
Part 4-21: Data-link layer protocol
specification - Type 21 elements
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
The Basic Model
ISO/IEC 7498-3 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
Naming and addressing
ISO/IEC 8802-3 2000 Information technology - Telecommunications - -
and information exchange between systems -
Local and metropolitan area networks -
Specific requirements -
Part 3: Carrier sense multiple access with
collision detection (CSMA/CD) access method
and physical layer specifications
ISO/IEC 10731 1994 Information technology - Open Systems - -
Interconnection - Basic reference model -
Conventions for the definition of OSI services
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SIST EN 61158-3-21:2012
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SIST EN 61158-3-21:2012
IEC 61158-3-21
®
Edition 1.0 2010-08
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3 21: Data-link layer service definition – Type 21 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 25.04.40; 35.100.20; 35.110 ISBN 978-2-88912-079-6
® Registered trademark of the International Electrotechnical Commission
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SIST EN 61158-3-21:2012
– 2 – 61158-3-21 © IEC:2010(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
1.1 Overview .7
1.2 Specifications.7
1.3 Conformance.7
2 Normative references .8
3 Terms, definitions, symbols, abbreviations, and conventions .8
3.1 Reference model terms and definitions.8
3.2 Service convention terms and definitions.10
3.3 Data link service terms and definitions .10
3.4 Symbols and abbreviations.13
3.5 Conventions .14
4 Data-link layer services and concepts.15
4.1 General .15
4.2 Detailed description of the data service .19
4.3 Detailed description of the sporadic data service.21
4.4 Detailed description of network control message service .23
5 Data link management services .26
5.1 General .26
5.2 Data link management service (DLMS) facilities .26
5.3 Data link management service (DLMS).26
5.4 Overview of interactions .27
5.5 Detailed specification of service and interactions.29
6 MAC control service .37
6.1 General .37
6.2 MAC control service .37
6.3 Overview of interactions .37
6.4 Detailed specification of service and interactions.38
7 Ph-control service .40
7.1 General .40
7.2 Ph-control service .40
7.3 Overview of interactions .40
7.4 Detailed specification of service and interactions.41
Bibliography.44
Figure 1 – Full-duplex flow control .16
Figure 2 – Sequence diagram of DL-DATA service .16
Figure 3 – Sequence diagram of DL-SPDATA service .17
Figure 4 – Sequence diagram of NCM service primitive .17
Figure 5 – Relationships of DLSAPs, DLSAP-addresses, and group DL-addresses .18
Figure 6 – DL-DATA service .19
Figure 7 – Sequence diagram of Reset, Set-value, Get-value, SAP-allocation, SAP-
deallocation, Get-SAP information and Get-diagnostic information service primitives .28
Figure 8 – Sequence diagram of Event service primitive .29
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SIST EN 61158-3-21:2012
61158-3-21 © IEC:2010(E) – 3 –
Figure 9 – Sequence diagram of MAC-reset and MAC-forward-control service primitive.38
Figure 10 – Sequence diagram of Ph-reset and Ph-get-link-status service primitive.41
Figure 11 – Sequence diagram of Ph-link-status-change service primitive .41
Table 1 – Destination DL-address .18
Table 2 – Primitives and parameters used in DL-DATA service.20
Table 3 – DL-DATA Primitives and Parameters.20
Table 4 – Primitives and parameters used in DL-SPDATA service .22
Table 5 – DL-SPDATA Primitives and Parameters .22
Table 6 – Primitives and parameters used on DL-NCM_SND service .23
Table 7 – DL-NCM_SND Primitives and Parameters .24
Table 8 – Summary of Network Control Message Type .25
Table 9 – Summary of DL-management primitives and parameters .28
Table 10 – DLM-RESET primitives and parameters.29
Table 11 – DLM-SET_VALUE primitives and parameters .30
Table 12 – DLM-GET_VALUE primitives and parameters .31
Table 13 – DLM-SAP_ALLOC primitives and parameters .32
Table 14 – DLM-SAP_DEALLOC primitives and parameters .33
Table 15 – DLM-GET_SAP_INFO primitives and parameters .33
Table 16 – DLM-GET_DIAG primitives and parameters.34
Table 17 – DLM-EVENT primitives and parameters.35
Table 18 – DLM event identifier .36
Table 19 – DLM-GET_PATH primitives and parameters .36
Table 20 – Summary of MAC control primitives and parameters.38
Table 21 – MAC-RESET primitives and parameters .38
Table 22 – MAC-FW_CTRL primitives and parameters .39
Table 23 – Summary of Ph-control primitives and parameters.40
Table 24 – Ph-RESET primitives and parameters.41
Table 25 – Ph-GET_LINK_STATUS primitives and parameters .42
Table 26 – Ph-LINK_STATUS _CHANGE primitives and parameters .43
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-21: Data-link layer service definition –
Type 21 elements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
NOTE 1 Use of some of the associated protocol types is restricted by their intellectual-property-right holders. In
all cases, the commitment to limited release of intellectual-property-rights made by the holders of those rights
permits a particular data-link layer protocol type to be used with physical layer and application layer protocols in
type combinations as specified explicitly in profile parts. Use of the various protocol types in other combinations
may require permission of their respective intellectual-property-right holders.
International Standard IEC 61158-3-21:2010 has been prepared by subcommittee 65C:
Industrial networks, of IEC technical committee 65: Industrial-process measurement, control
and automation.
This standard cancels and replaces IEC/PAS 62573 published in 2008. This first edition
constitutes a technical revision.
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SIST EN 61158-3-21:2012
61158-3-21 © IEC:2010(E) – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
65C/604/FDIS 65C/618/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC web site.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE 2 The revision of this standard will be synchronized with the other parts of the IEC 61158 series.
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– 6 – 61158-3-21 © IEC:2010(E)
INTRODUCTION
This part of IEC 61158 is one of a series produced to facilitate the interconnection of
automation system components. It is related to other standards in the set as defined by the
“three-layer” fieldbus reference model described in IEC/TR 61158-1.
Throughout the set of fieldbus standards, the term “service” refers to the abstract capability
provided by one layer of the OSI Basic Reference Model to the layer immediately above. Thus,
the data-link layer service defined in this standard is a conceptual architectural service,
independent of administrative and implementation divisions.
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SIST EN 61158-3-21:2012
61158-3-21 © IEC:2010(E) – 7 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-21: Data-link layer service definition –
Type 21 elements
1 Scope
1.1 Overview
This part of IEC 61158 provides the common elements for basic time-critical messaging
communications between devices in an automation environment. The term “time-critical” in
this context means the prioritized full-duplex collision-free time-deterministic communication,
of which one or more specified actions are required to be completed with some defined level
of certainty. Failure to complete specified actions within the required time risks the failure of
the applications requesting the actions, with attendant risk to equipment, plant, and possibly
human life.
This standard defines in an abstract way the externally visible service provided by the
Type 21 data-link layer in terms of:
a) the primitive actions and events of the service;
b) the parameters associated with each primitive action and event, and the form that they
take; and
c) the interrelationships between these actions and events, and their valid sequences.
The purpose of this standard is to define the services provided to:
• The Type 21 application layer at the boundary between the application and DLLs of the
fieldbus reference model;
• Systems management at the boundary between the DLL and the systems management of
the fieldbus reference model.
1.2 Specifications
The principal objective of this standard is to specify the characteristics of conceptual DLL
services suitable for time-critical communications, and to supplement the OSI Basic
Reference Model in guiding the development of data link protocols for time-critical
communications. A secondary objective is to provide migration paths from previously existing
industrial communications protocols.
This standard may be used as the basis for formal data link programming interfaces.
Nevertheless, it is not a formal programming interface, and any such interface will need to
address implementation issues not covered by this standard, including:
a) The sizes and octet ordering of various multi-octet service parameters;
b) The correlation of paired primitives for request and confirm, or indication and response.
1.3 Conformance
This standard does not specify individual implementations or products, nor do they constrain
the implementations of data-link entities within industrial automation systems.
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There is no conformance of equipment to this data-link layer service definition standard.
Instead, conformance is achieved through implementation of the corresponding data-link
protocol that fulfils the Type 21 DLL services defined in this standard.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
1
IEC 61158-2:2010 , Industrial communication networks – Fieldbus specifications – Part 2:
Physical layer specification and service definition
1
IEC 61158-4-21:2010 , Industrial communication networks – Fieldbus specifications –
Part 4-21: Data-link layer protocol specification – Type 21 elements
ISO/IEC 7498-1, Information technology – Open Systems Interconnection – Basic Reference
Model: The Basic Model
ISO/IEC 7498-3, Information technology – Open Systems Interconnection – Basic Reference
Model: Naming and addressing
ISO/IEC 8802-3:2000, Information technology – Telecommunications and information
exchange between systems – Local and metropolitan area networks – Specific requirements –
Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and
physical layer specifications
ISO/IEC 10731:1994, Information technology – Open Systems Interconnection – Basic
Reference Model – Conventions for the definition of OSI services
3 Terms, definitions, symbols, abbreviations, and conventions
3.1 Reference model terms and definitions
This standard is based in part on the concepts developed in ISO/IEC 7498-1 and
ISO/IEC 7498-3, and makes use of the following terms defined therein.
3.1.1 DL-address [ISO/IEC 7498-3]
3.1.2 DL-address-mapping [ISO/IEC 7498-1]
3.1.3 called-DL-address
[ISO/IEC 7498-3]
3.1.4 calling-DL-address [ISO/IEC 7498-3]
3.1.5 centralized multi-end-point-connection [ISO/IEC 7498-1]
3.1.6 DL-connection [ISO/IEC 7498-1]
3.1.7 DL-connection-end-point [ISO/IEC 7498-1]
3.1.8 DL-connection-end-point-identifier [ISO/IEC 7498-1]
3.1.9 DL-connection-mode transmission [ISO/IEC 7498-1]
3.1.10 DL-connectionless-mode transmission
[ISO/IEC 7498-1]
—————————
1
To be published.
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61158-3-21 © IEC:2010(E) – 9 –
3.1.11 correspondent (N)-entities [ISO/IEC 7498-1]
correspondent DL-entities (N=2)
correspondent Ph-entities (N=1)
3.1.12 DL-duplex-transmission [ISO/IEC 7498-1]
3.1.13 (N)-entity [ISO/IEC 7498-1]
DL-entity (N=2)
Ph-entity (N=1)
3.1.14 DL-facility [ISO/IEC 7498-1]
3.1.15 flow control
[ISO/IEC 7498-1]
3.1.16 (N)-layer [ISO/IEC 7498-1]
DL-layer (N=2)
Ph-layer (N=1)
3.1.17 layer-management [ISO/IEC 7498-1]
3.1.18 DL-local-view [ISO/IEC 7498-3]
3.1.19 DL-name
[ISO/IEC 7498-3]
3.1.20 naming-(addressing)-domain [ISO/IEC 7498-3]
3.1.21 peer-entities [ISO/IEC 7498-1]
3.1.22 primitive name [ISO/IEC 7498-3]
3.1.23 DL-protocol [ISO/IEC 7498-1]
3.1.24 DL-protocol-connection-identifier [ISO/IEC 7498-1]
3.1.25 DL-protocol-data-unit [ISO/IEC 7498-1]
3.1.26 DL-relay [ISO/IEC 7498-1]
3.1.27 Reset [ISO/IEC 7498-1]
3.1.28 responding-DL-address [ISO/IEC 7498-3]
3.1.29 Routing [ISO/IEC 7498-1]
3.1.30 Segmenting [ISO/IEC 7498-1]
3.1.31 (N)-service [ISO/IEC 7498-1]
DL-service (N=2)
Ph-service (N=1)
3.1.32 (N)-service-access-point [ISO/IEC 7498-1]
DL-service-access-point (N=2)
Ph-service-access-point (N=1)
3.1.33 DL-service-access-point-address [ISO/IEC 7498-3]
3.1.34 DL-service-connection-identifier [ISO/IEC 7498-1]
3.1.35 DL-service-data-unit [ISO/IEC 7498-1]
3.1.36 DL-simplex-transmission [ISO/IEC 7498-1]
3.1.37 DL-subsystem [ISO/IEC 7498-1]
3.1.38 systems-management [ISO/IEC 7498-1]
3.1.39 DLS-user-data [ISO/IEC 7498-1]
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3.2 Service convention terms and definitions
This standard also makes use of the following terms defined in ISO/IEC 10731 as they apply
to the data-link layer.
3.2.1 acceptor
3.2.2 asymmetrical service
3.2.3 confirm (primitive);
requestor.deliver (primitive)
3.2.4 deliver (primitive)
3.2.5 DL-confirmed-facility
3.2.6 DL-facility
3.2.7 DL-local-view
3.2.8 DL-mandatory-facility
3.2.9 DL-non-confirmed-facility
3.2.10 DL-protocol-machine
3.2.11 DL-provider-initiated-facility
3.2.12 DL-provider-optional-facility
3.2.13 DL-service-primitive;
primitive
3.2.14 DL-service-provider
3.2.15 DL-service-user
3.2.16 DLS-user-optional-facility
3.2.17 indication (primitive);
acceptor.deliver (primitive)
3.2.18 multi-peer
3.2.19 request (primitive);
requestor.submit (primitive)
3.2.20 requestor
3.2.21 response (primitive);
acceptor.submit (primitive)
3.2.22 submit (primitive)
3.2.23 symmetrical service
3.3 Data link service terms and definitions
3.3.1
DL-segment, link, local link
single data link (DL) subnetwork in which any of the connected data link entities (DLEs) may
communicate directly, without any intervening data link relaying, whenever all of those DLEs
that are participating in an instance o
...
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