ISO/IEC 8473-2:1996

Information technology — Protocol for providing the connectionless-mode network service — Part 2: Provision of the underlying service by an ISO/IEC 8802 subnetwork

Differs from the other related International Standards by the layers defined in ISO/IEC 7498-1. In particular, it defines the way in which a local area network that conforms to ISO/IEC 8802 may be used as a subnetwork within the network layer to provide the abstract underlying service with respect to which the protocol defined by ISO/IEC 8473-1 is specified.

Technologies de l'information — Protocole pour la fourniture du service de réseau en mode sans connexion — Partie 2: Fourniture du service sous-jacent par un sous-réseau ISO/CEI 8802

General Information

• Status: Published
• Publication Date: 13-Mar-1996
• ICS: 35.100.30 - Network layer
• Technical Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Drafting Committee: ISO/IEC JTC 1/SC 6/WG 7 - Network, transport and future network
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 13-Aug-2001

Standards Content (Sample)

INTERNATIONAL
ISO/IEC
STANDARD
8473-2
First edition
1996-03-15
Information technolgy - Protocol for
providing the connectionless-mode
network service -
Part 2:
Provision of the underlying service by an
lSO/IEC 8802 subnetwork
Technologies de /‘information
- Protocole pour la fourniture du service de
r&eau en mode sans connexion -
Partie 2: Fourniture du service sous-jacent par un sous-r&eau
ISO/CEI 8802
Reference number
lSO/IEC 8473-2:1996(E)

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ISO/IEC 8473-2: 1.996(E)
Contents
. . .
111
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .“.
iv
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1 Scope
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
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2 Normative references
2
3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.
2
Reference model definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Network layer architecture definitions
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Network layer addressing definitions
2
3.4 Local area network definitions *.
2
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4 Abbreviations
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Subnetwork dependent convergence function
3
5.1 General model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
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5.2 Subnetwork user data
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.3 Subnetwork dependent convergence functions used with ISO/IEC 8802 subnetworks
8
Annex A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- PICS proforma
0 ISO/IEC 1996
All rights reserved. Unless otherwise specified, no part of this publication may be
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photocopying and microfilm, without permission in writing from the publisher.
ISO/IEC Copyright Office l Case postale 56 l CH- 1211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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ISO/IEC 8473-2: 1996(E)
0 ISO/IEC
Foreword
IS0 (the International Organization for Standardization) and IEC (the
International Electrotechnical Commission) form the specialized system for
worldwide standardization. National bodies that are members of IS0 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. IS0 and IEC technical committees collaborate in
fields of mutual interest. Other international organizations, governmental and
non-governmental, in liaison with IS0 and IEC, also take part in the work.
In the field of information technology, IS0 and IEC have established a joint
technical committee, ISO/IEC JTC 1. 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.
International Standard ISO/IEC 8473-2 was prepared by Joint Technical
Committee ISOLIEC JTC 1, Information technology, Subcommittee SC 6,
Telecommunications and information exchange between systems.
ISO/IEC 8473 consists of the following parts, under the general title Information
technology - Protocol for providing the connectionless-mode network service:
Part I: Protocol specification
-
- Part 2: Provision of the underlying service by an ISO/.EC 8802
subnetwork
Part 3: Provision of the underlying service by an X.25 subnetwork
- Part 4: Provision of the underlying service by a subnetwork that provides
the OSI data link service
- Part 5: Provision of the underlying service for operation over ISDN
circuit-switched B-channel
Annex A forms an integral part of this part of ISO/IEC 8473.
111

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0 ISO/IEC
ISO/IEC 8473-2: 1996(E)
Introduction
This is one of a set of International Standards produced to facilitate the interconnection of open systems. The set covers
the services and protocols required to achieve such interconnection.
This International Standard is positioned with respect to other related International Standards by the layers defined in
ISO/IEC 7498-l. In particular, it defines the way in which a local area network that conforms to ISO/IEC 8802 may be
used as a subnetwork within the Network layer to provide the abstract underlying service with respect to which the
protocol defined by ISO/IEC 8473-l is specified.
In order to evaluate the conformance of a particular implementation of this protocol, it is necessary to have a statement of
which of the protocol’s capabilities and options have been implemented. Such a statement is called a Protocol
Implementation Conformance Statement (PICS), as defined in ISO/IEC 9646-l. A PIGS proforma, from which a PIGS
may be prepared for a specific implementation, is included in this International Standard as normative -Annex A.

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INTERNATIONAL STANDARD @ ISO/IEC ISO/IEC 8473-2: 1996(E)
Information technology - Protocol for providing the
connectionless-mode network service -
Part 2:
Provision of the underlying service by an ISO/IEC 8802
subnetwork
1 Scope
This part of ISO/IEC 8473 specifies the way in which the underlying service assumed by the protocol defined by
ISO/IEC 8473-l is provided by a subnetwork that conforms to ISO/IEC 8802 through the operation of a subnetwork
dependent convergence function (SNDCF) as described in ISO/IEC 8648. The SNDCF specified by this part of
ISO/IEC 8473 may be used with any ISO/IEC 8802 compliant subnetwork that provides the logical link control sublayer
interface service defined by ISO/IEC 8802-2.
This part of ISO/IEC 8473 also provides the PIGS proforma for this protocol, in compliance with the relevant
requirements, and in accordance with the relevant guidance, given in ISO/IEC 9646-l.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO/IEC 8473. At the time of publication, the editions indicated were valid. All International Standards are subject to
revision, and parties to agreements based on this part of ISO/IEC 8473 are encouraged to investigate the possibility of
applying the most recent editions of the Standards listed below. Members of IEC and IS0 maintain registers of currently
valid International Standards.
ISO/IEC 7498- 1: 1994, Information technology - Open Systems Interconnection - Basic Reference Model: The Basic
Model.
ISO/IEC 8348: 1993, Information technology - Open Systems Interconnection - Network service definition .
ISOIIEC 8648: 1988, Information processing systems - Open Systems Interconnection - Internal organization of the
network layer.
ISO/IEC TR 8802- 1: 1994, Information technology - Telecommunications and information exchange between
systems - Data communications - Local and metropolitan area networks - Specific requirements - Part I: Overview
of Local Area Network Standards.
ISO/IEC 8802-2: 1994, Information technology - Telecommunications and information exchange between systems -
Data communications - Local and metropolitan area networks - Spectfic requirements - Part 2. Logical link
. control .
ISO/IEC 9646- 1: 199 1, Information technology - Open Systems Interconnection - Conformance testing methodology
and framework - Part 1: General concepts.

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0 ISO/IEC
ISO/IEC 8473-2: 1996(E)
3 Definitions
31 . Reference model definitions
This part of ISO/IEC 8473 makes use of the following terms defined in ISO/IEC 7498-l:
network entity
a)
b) Network layer
service
C>
d) service data unit
e) protocol control information
32 . Network layer architecture definitions
This part of ISO/IEC 8473 makes use of the following terms defined in ISO/IEC 8&48:
subnetwork
a)
b) subnetwork dependent convergence protocol
subnetwork dependent convergence function
C>
d) subnetwork access protocol
33 . Network layer addressing definitions
This part of ISO/IEC 8473 makes use of the following terms defined in ISO/IEC 8348:
subnetwork point of attachment
a)
34 . Local area network definitions
This part of ISO/IEC 8473 makes use of the following terms defined in ISO/IEC 8802-l:
a) local area network
b) logical link control
c) logical link control sublayer
d) media access control
4
Abbreviations
connectionless-mode network protocol
CLNP
LLC logical link control
MAC medium access control
PDU protocol data unit
PIGS protocol implementation conformance statement
QOS quality of service
SDU service data unit
SN subnetwork
SN DCF subnetwork dependent convergence function
SNPA subnetwork point of attachment
SNSDU subnetwork service data unit
UI unnumbered information

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ISO/IEC 8473-2: 1996(E)
0 ISO/IEC
5
Subnetwork dependent convergence function
51 . General model
The general model for providing the underlying service assumed by the protocol in conjunction with a real subnetwork
that uses a connectionless subnetwork access protocol is as follows. The generation of an SN-UNITDATA Request by
the CLNP results in the generation of a corresponding subnetwork-specific UNITDATA request by the subnetwork
dependent convergence function. The receipt of a subnetwork-specific UNITDATA indication associated with delivery
of a connectionless data unit to its destination causes the SNDCF to generate an SN-IJNITDATA Indication to the
CLNP.
The general model for providing the underlying service assumed by the CLNP in conjunction with a real subnetwork that
uses a connection-mode subnetwork access protocol is as follows. The generation of an SN-UNITDATA Request by the
CLNP causes a connection (logical channel, logical link, or the equivalent) to be made available for the transmission of
SN-User-data. If a connection cannot be made available, the SN-UNITDATA Request is discarded. The receipt of
subnetwork-specific PDUs containing SN-User-data causes the SNDCF to generate an SN-UNITDATA Indication to
the CLNP.
Where a real subnetwork is designed to use either a connectionless-mode or a connection-mode subnetwork access
protocol, the provision of the underlying service assumed by the CLN P is achieved by using the connectionless-mode
alternative.
52 . Subnetwork user data
The SN-User-data consists of an ordered multiple of octets, and is transferred transparently between the specified
subnetwork points of attachment.
The underlying service assumed by the CLNP is required to support a service data unit size of at least 512 octets.
If the minimum service data unit sizes supported by all of the subnetworks involved in the transmission of a particular
PDU are known to be large enough that segmentation is not required, then either the full protocol or the non-segmenting
protocol subset may be used.
Data received from a subnetwork with protocol identification specifying the CLNP protocol (ISO/IEC 8473) shall be
processed according to ISO/IEC 8473- I.
NOTE - Data with other protocol identification should be ignored, since it may have been sent
...