ISO/IEC TR 11802-1:2005
(Main)Information technology — Telecommunications and information exchange between systems — Local and metropolitan area networks — Technical reports and guidelines — Part 1: The structure and coding of Logical Link Control addresses in Local Area Networks
Information technology — Telecommunications and information exchange between systems — Local and metropolitan area networks — Technical reports and guidelines — Part 1: The structure and coding of Logical Link Control addresses in Local Area Networks
ISO/IEC TR 11802-1:2005 provides: a description of the ISO/IEC 8802-2 LLC addressing conventions, and the consideration for the manner in which new LLC address uses are assigned a value. It is outside the scope of this TR to provide architectural judgements regarding the entities which are identified by particular address value(s).
Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseaux locaux et métropolitains — Rapports techniques et lignes directrices — Partie 1: Structure et codage des adresses de contrôle de liaison logique dans les réseaux locaux
General Information
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Standards Content (Sample)
TECHNICAL ISO/IEC
REPORT TR
11802-1
Fourth edition
2005-11-01
Information technology —
Telecommunications and information
exchange between systems — Local and
metropolitan area networks — Technical
reports and guidelines —
Part 1:
The structure and coding of Logical Link
Control addresses in Local Area
Networks
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseaux locaux et métropolitains —
Rapports techniques et lignes directrices —
Partie 1: Structure et codage des adresses de contrôle de liaison
logique dans les réseaux locaux
Reference number
ISO/IEC TR 11802-1:2005(E)
©
ISO/IEC 2005
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ISO/IEC TR 11802-1:2005(E)
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ii © ISO/IEC 2005 – All rights reserved
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ISO/IEC TR 11802-1:2005(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
In exceptional circumstances, the joint technical committee may propose the publication of a Technical Report
of one of the following types:
— type 1, when the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts;
— type 2, when the subject is still under technical development or where for any other reason there is the
future but not immediate possibility of an agreement on an International Standard;
— type 3, when the joint technical committee has collected data of a different kind from that which is normally
published as an International Standard (“state of the art”, for example).
Technical Reports of types 1 and 2 are subject to review within three years of publication, to decide whether
they can be transformed into International Standards. Technical Reports of type 3 do not necessarily have to
be reviewed until the data they provide are considered to be no longer valid or useful.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
ISO/IEC TR 11802-1 which is a Technical Report of type 3, was prepared by Joint Technical Committee
ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information exchange
between systems.
This fourth edition cancels and replaces the third edition (ISO/IEC TR 11802-1:2002), which has been
technically revised.
ISO/IEC TR 11802 consists of the following parts, under the general title Information technology —
Telecommunications and information exchange between systems — Local and metropolitan area networks —
Technical reports and guidelines:
⎯ Part 1: The structure and coding of Logical Link Control addresses in Local Area Networks [Technical
Report]
⎯ Part 2: Standard Group MAC Addresses [Technical Report]
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ISO/IEC TR 11802-1:2005(E)
Introduction
The standards for LANs are generally comprised of the physical layer, the medium access control (MAC)
sublayer, and the logical link control (LLC) sublayer. In OSI terminology, the MAC and LLC sublayers are
considered to be sublayers of the OSI data link layer. Both the MAC and LLC sublayers contain fields for
addressing.
This TR contains a description of the LLC addresses, and a reference to the url whereby a list of those values
in current use can be found together with the application process for requesting a new assignment. This site is
managed by the august IEEE-SA Registration authority.
The addressing space in LLC is limited, and it is such that it is considered to be a scarce resource. It is
therefore prudent to consume this resource in a considered and conservative manner. To this end this TR
indicates the kind of considerations which will be used by ISO/IEC when making the association between a
particular LLC address value and use to which it is put. These considerations are intended to be sufficiently
broad to allow a wide variety of LLC address uses to be recorded, and also sufficiently restrictive so that
addresses values are not unwisely assigned.
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TECHNICAL REPORT ISO/IEC TR 11802-1:2005(E)
Information technology — Telecommunications and information
exchange between systems — Local and metropolitan area
networks — Technical reports and guidelines —
Part 1:
The structure and coding of Logical Link Control addresses in
Local Area Networks
1 Scope
This Technical Report (TR) provides:
⎯ a description of the ISO/IEC 8802-2 LLC addressing conventions, and
⎯ the consideration for the manner in which new LLC address uses are assigned a value.
It is outside the scope of this TR to provide architectural judgements regarding the entities which are identified
by particular address value(s).
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.
ISO/IEC TR 9577, Information technology — Telecommunications and information exchange between
systems — Protocol identification in the network layer
ISO/IEC 8802-2:1994, Information technology — Telecommunications and information exchange between
systems — Local and metropolitan area networks —Specific requirements — Part 2: Logical link control
3 Abbreviations
The following abbreviations are used in this Technical Report.
DSAP Destination Service Access Point
IEEE Institute of Electrical and Electronics Engineers
LLC Logical Link Control
PDU Protocol Data Unit
SAP Service Access Point
SNAP Sub-Network Access Protocol
SSAP Source Service Access Point
LSAP Link Service Access Point
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ISO/IEC TR 11802-1:2005(E)
4 General considerations
4.1 Functions of LLC addresses
Logical Link Control (LLC) protocol data units contain addressing information. This addressing information
consists of two fields; the Destination Service Access Point (DSAP) address field, and the Source Service
Access Point (SSAP) address field. Each of these is an 8 bit field and each is made up of two components.
In the DSAP address field, the components are an address type designation bit, and seven bits of actual
address. When the address type designation bit is set to '0', it denotes that the actual address is an individual
address. When the address type designation bit is set to '1', it denotes that the DSAP actual address is a
group address. This Technical Report considers the two types of actual address separately.
In the SSAP address field, the components are the command/response identifier bit, and seven bits of actual
address. The actual address in the SSAP field is always an individual address.
In the general case, an individual actual address identifies a protocol, or set of protocols, in the next higher
layer. In OSI environments, the next higher layer is the Network Layer. In non-OSI envir
...
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