EN ISP 10613-1:1996

SLOVENSKI STANDARD
SIST EN ISP 10613-1:1997
01-december-1997
Information technology - International Standardized Profile RA - Relaying the
Connectionless-mode Network Service - Part 1: Subnetwork-independent
requirements (ISO/IEC ISP 10613-1:1994)
Information technology - International Standardized Profile RA - Relaying the
Connectionless-mode Network Service - Part 1: Subnetwork-independent requirements
(ISO/IEC ISP 10613-1:1994)
Technologies de l'information - Profil normalisé international RA - Relais de service de
réseau en mode sans connexion - Partie 1: Spécifications indépendantes du sous-
réseau (ISO/IEC ISP 10613-1:1994)
Ta slovenski standard je istoveten z: EN ISP 10613-1:1996
ICS:
35.100.05 9HþVORMQHXSRUDEQLãNH Multilayer applications
UHãLWYH
SIST EN ISP 10613-1:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISP 10613-1:1997

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SIST EN ISP 10613-1:1997

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SIST EN ISP 10613-1:1997

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SIST EN ISP 10613-1:1997
INTERNATIONAL
ISO/IEC
STANDARDIZED ISP
PROFILE
10613-1
First edition
1994-05-15
Information technology - International
Standardized Profile RA - Relaying the
Connectionless-mode Network Service -
Part 1:
Subnetwork-independent requirements
Technologies de I ’informa tion - Profil normalise international RA -
Relais de Service de rbseau en mode sans connexion -
Partie 1: Spkifica tions indgpendan tes du sous-rbseau

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SIST EN ISP 10613-1:1997
ISO/IEC ISP 10613=1:1994(E)
Page
Contents
. . .
in
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
4 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Requirements .
5
....................................................... 2
5.1 Introduction
........................................
2
5.2 Static Conformance Requirements
......................................
3
5.3 Dynamit Conformance Requirements
....................................... 5
Annex A ISPICS Requirements List (normative)
....................................................... 5
A.l Introduction
.............................................. 5
A.2 Notation and Conventions
.................................................. 7
A.3 IPRL for ISO 8473
.................................................. 8
A.4 IPRL for ISO 9542
Annex B Assumed Base Standard PICS Proforma for ISO 8473 Intermediate System Operation (normative) 9
....................................................... 9
B.1 Introduction
.......................................
9
B.2 Abbreviations and Special Symbols
............................... 10
B.3 Instructions for Completing the PICS Proforma
.......................................................
12
B.4 Identification
................................................... 13
B.5 Major Capabilities
13
B.6 Endsystems .
................................................. 14
B.7 Intermediate Systems
...............................
17
B.8 Subnetwork-dependent Convergence Functions
............................................ 2 1
Annex C Recommendations (informative)
....................................................... 21
C.l Introduction
............................................ 21
C.2 ISO 9542 Recommendations
............................................ 21
C.3 ISO 8473 Recommendations
0 ISO/IEC 1994
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any
form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in
writing from the publisher.
l Case postale 56 l CH-121 1 Geneve l Switzerland
ISO/IEC Copyright Office
Printed in S witzerland
ii

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SIST EN ISP 10613-1:1997
0 ISO/IEC ISO/IEC ISP 10613-1: 1994(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, govemmental and non-govemmental,
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 JTCl.
In addition to developing International Standards, ISO/IEC JTCl has created a Special Group on Functional
Standardization for the elaboration of International Standardized Profiles.
An International Standardized Profile is an intemationally agreed, harmonized document which identifies a
Standard or group of Standards, together with Options and parameters, necessary to accomplish a function or a
set of functions.
Draft International Standardized Profiles are circulated to national bodies for voting. Publication as
an
International Standardized Profile requires approval by at least 75 % of the national bodies casting a vote.
International Standardized Profile ISO/IEC ISP 10613-1 was prepared with the collaboration of
- Asia-Oceania Workshop (AOW);
- European Workshop for Open Systems (EWOS);
- Open Systems Environment Implernentors’ Workshop (OIW).
ISO/IEC ISP 10613 consists of several parts, under the general title Information technology - International
Standardized Profile RA - Relaying the Connectionless-mode Network Service:
Part 1: Subnetwork-independent requirements
Part 2: LAN subnetwork-dependent, media-independent requirements
- Part 3: CSMAICD LAN subnetwork-dependent, media-dependent requirements
Part 4: FDDI LAN subnetwork-dependent, media-dependent requirements
- Part 5: Definition of Profile RA51.51, relaying the Connectionless-mode Network Service between
CSMAICD LAN subnetworks
- Part &-Definition of Profile RA.51 54, relaying the Connectionless-mode Network Service between
CSMAICD LAN subnetworks and FDDI LAN subnetworks
- Part 7: PSDN subnetwork-dependent, media-dependent requirements virtual calls over a
for
permanent access
- of Profile RA.51 .llll, relaying the Connectionless-mode Network Service
Part 8: Definition
between CSMAlCD LAN subnetworks and PSDNs using virtual calls over a PSTN leased line
permanent access
. . .
111

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SIST EN ISP 10613-1:1997
ISO/IEC ISP 10613-1:1994(E) 0 1s0/IJX
- Part 9: Definition of Profile RA51.1121, relaying the Connectionless-mode Network Service
between CSMAICD LAN subnetworks and PSDNs using virtual calls over a digital data
circuitlCSDN leased line permanent access
- Part 10: Token Ring LAN subnetwork-dependent, media-dependent requirements
-
Part 11: Definition of Profile RA51.53, relaying the Connectionless-mode Network Service between
CSMAICD LAN subnetworks and Token Ring LAN subnetworks
- Part 12: Definition ofprofile RA53.53, relaying the Connectionless-mode Network Service between
Token Ring LAN subnetworks
- Part 13: Definition ofproBle RA53.54, relaying the Connectionless-mode Network Service between
Token Ring LAN subnetworks and FDDI LAN subnetworks
-
Part 14: Definition of Profile RA54.54, relaying the Connectionless-mode Network Service between
FDDI LAN subnetworks
- Part 1.5: Definition of Profile RA53.1111, relaying the Connectionless-mode Network Service
between Token Ring LAN subnetworks and PSDNs using virtual calls over a PSTN leased line
permanent access
- Part 16: Definition of Profile RA53.1121, relaying the Connectionless-mode Network Service
between Token Ring LAN subnetworks and PSDNs using virtual calls over a digital data
circuitlCSDN leased line permanent access
- Part 17: Definition of Profile RA54.1111, relaying the Connectionless-mode Network Service
between FDDI LAN subnetworks and PSDNs using virtual calls over a PSTN leased line
permanent access
- Part 18: Definition of Profile RA54.1121, relaying the Connectionless-mode Network Service
between FDDI LAN subnetworks and PSDNs using virtual calls over a digital data circuitlCSDN
leased line permanent access
Annexes A and B form an integral part of this part of ISO/IEC ISP 10613. Annex C is for information only.

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SIST EN ISP 10613-1:1997
0 ISO/IEC ISO/IEC ISP 10613=1:1994(E)
Introduction
This International Standardized Profile (ISP) is defined in accordance with the principles specified by XSO/IEC
Technical Report 10000.
The context of Functional Standardization is one area in the overall field of Information Technology (IT)
standardization activities, covering base Standards, profiles, and registration mechanisms. A Profile defines a
combination of base Standards that collectively perform a specific well-defined IT function. Profiles standardize
the use of Options and other variations in the base Standards, and provide a basis for the development of uniform,
intemationally recognized System tests.
ISPs arc produced not simply to ‘legitimize’ a particular choice of base Standards and Options, but to promote
real System interoperability. One of the most important roles for an ISP is to serve as the basis for the
development (by organizations other than ISO and IEC) of intemationally recognized tests. The development and
widespread acceptance of tests based on this and other ISPs is crucial to the successful realization of this goal.
ISO/IEC ISP 10613 consists of several parts of which this is part 1. This part of ISO/IEC ISP 10613 specifies
the Profile requirements that are subnetwork-independent. There are further parts which specify subnetwork-
dependent and media-dependent requirements. In addition, for each individual Profile there is a part of ISO/IEC
ISP 10613 which identifies the specific requirements of that Profile, making reference to appropriate material
from part 1 and from the subnetwork dependent parts of ISO/IEC ISP 10613.

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0 ISO/IEC
ISO/IEC ISP 10613-1: 1994(E)
blank page

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SIST EN ISP 10613-1:1997
INTERNATIONAL STANDARDIZED PROFILE OISO/IEC
ISOIIEC ISP 10613=1:1994(E)
Information technology - International Standardized
Profile RA - Relaying the Connectionless-mode Network
Service -
Part 1:
Subnetwork-independent requirements
1
Scope
This International Standardized Profile is applicable to interworking units concemed with operating in the Open
Systems Interconnection (OSI) environment. It specifies a combination of OS1 base standards that collectively
provide a Network Relay function for the connectionless-mode Network Service.
This part of ISO/IEC ISP 10613 specifies requirements which are applicable to interworking units operating the
connectionless-mode Network Service regardless of the type of subnetworks to which they are attached.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this
International Standardized Profile. At the time of publication, the editions indicated were valid. All documents
are subject to revision, and Parties to agreements based on this International Standardized Profile are wamed
against automatically applying any more recent editions of the documents listed below, since the nature of
references made by ISPs to such documents is that they may be specific to a particular edition. Members of IEC
and ISO maintain registers of currently valid International Standards and ISPs, and CCITT’ maintains published
editions of its current Recommendations.
ISO 8473:1988, Information processing Systems - Data communications - Protocol for providing the
connectionless-mode Network Service.
ISO 8473: 1988/Corr. 1: 1992, Information processing Systems - Data communications - Protocol for providing the
Connectionless-mode Network Service - Technical Corrigendum 1.
NOTE - This Technical Corrigendum to ISO 8473 is to apply throughout in this part of ISO/IEC ISP 10613, wherever ISO
8473 itself is referenced.
ISO 9542: 1988, Information processing Systems - Telecommunications and information exchange between Systems
- End system to Intermediate System routeing exchange protocol for use in conjunction with the Protocol for
providing the connectionless-mode network Service (ISO 8473).

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SIST EN ISP 10613-1:1997
ISO/IEC ISP 10613=1:1994(E) 0 ISO/IEC
ISO 9542: 1988/Corr. 1: 199 1, Information processing Systems - Telecommunications and information exchange
between Systems - End System to Intermediate System routeing exchange protocol for use in conjunction with the
Protocol for provkfing the connectionless-mode network Service (ISO 8473) - Technical Corrigendum 1.
NOTE - This Technical Corrigendum to ISO 9542 is to apply throughout in this part of ISO/IEC ISP 10613, wherever ISO
9542 itself is referenced.
ISo/rEC TR 10000-1: 1992, Information technology - Framework and taxonomy of International Standardized
Profiles - Part 1: Framework.
ISOflEC T ’R 10000-2: 1992, Information technology - Framework and taxonomy of International Standardized
Profiles - Part 2: Taxonomy of OS1 Profiles.
3 Definitions
All the terms used in this part of ISO/IEC ISP 10613 are defined in the documents that are referenced in clause
2 .
4 Abbreviations
All abbreviations, including acronyms, are used in this part of ISO/IEC ISP 10613 as defined in the documents
that are referenced in clause 2.
5 Requirements
51 . Introduction
The requirements in this clause apply to all interworking units within the scope of ISO/IEC ISP 10613, and are
to be implemented for all the subnetwork attachments to which this part of ISO/IEC ISP 10613 applies.
Additional specific requirements apply with respect to attachments to certain types of subnetwork; these
requirements are specified in other Parts of ISO/IEC ISP 10613.
52 . Static Conformance Requirements
Overall Requirements
52.1
An implementation conforming to this part of ISO/IEC ISP 10613 shall meet the ISO 8473 requirements specified
in 5.2.2 below and the ISO 9542 requirements specified in 5.2.3 below, and shall implement all the features
identified as requirements in the ISPICS Requirements List in annex A.
5.2.2 ISO 8473
The implementation shall:

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SIST EN ISP 10613-1:1997
0 ISO/IEC ISO/IEC ISP 10613=1:1994(E)
implement the functions required for conformance to ISO 8473 by a System of type “forward” as
a)
specified in clause 9 of ISO 8473;
be capable of forwarding PDUs from any subnetwork attachment to the same or any other subnetwork
b)
attachment;
if the Reassembly function is implemented, provide a means to disable its use;
C)
in intermediate Systems may be either partial or full, depending on the reassembly
NOTE - If provided, reassembly
scheme in use, as indicated in s ubclause 6.8 of ISO 8473.
provide a mechanism capable of configuring specific entries into the Routing Information Base used
d)
by the ISO 8473 Route PDU function;
NOTE - Although it is required that this method of routing tan be selected for any given Network Address
regardless of its format or value, the number of different Network Addresses for which such information tan
simultaneously be held is an implementation-dependent matter. Implementations are permitted to provide the
capability of overriding the configured route by means of information obtained from a dynamic routing protocol,
since there are circumstances in which such information, if it becomes available, may be more accurate than the
pre-configured information.
implement the Partial Route Recording function.
e)
ISO 9542
5.2.3
The implementation shall:
implement the static conformance requirements for intermediate Systems specified in ISO 9542;
a>
if configuration information is implemented, provide a means to disable its use on each subnetwork
b)
independently .
53 . Dynamit Conformance Requirements
5.3.1 Overall Requirements
An implementation conforming to this part of ISO/IEC ISP 10613 shall carry out the supported functions of ISO
8473 as specified in 5.3.2 below, and the supported functions of ISO 9542 as specified in 5.3.3 below. It shall
behave in accordance with the requirements of the ISPICS Requirements List in annex A.
5.3.2 ISO 8473
The implementation shall:
execute the supported functions as required by clause 9 of ISO 8473;
a)
on receipt of a PDU whose first octet identifies the inactive subset of the protocol, neither forward it
b)
nor generate an error report.

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SIST EN ISP 10613-1:1997
0 ISO/IEC
ISO/IEC ISP 10613-1:1994(E)
53.3 ISO 9542
The implernentalion shall implement the dynamic conformance requirements specified in ISO 9542.

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SIST EN ISP 10613-1:1997
ISO/IEC ISP 10613=1:1994(E)
0 ISO/IEC
Annex A
(normative)
ISPICS Requirements List
Al . Introduction
ISO/IEC TR 10000-1 identifies three items to be included in an ISPICS Requirements List. These are:
general Options of the Profile;
list of base Standards selected in the Profile;
constraints on the allowable answers in the PICS proforma of each such base Standard.
The first two items relate to the Profile as a whole, and so are included only in those parts of ISO/IEC ISP 10613
which arc specific to individual profiles. But each part of ISO/IEC ISP 10613 contains the identification of those
PICS proforma constraints which are within its scope.
ISO/IEC TR lOOOO- 1 indicates that an ISPICS proforma may consist either of a simple list of constraints or of
amended copies of the base PICS proforma. In this part of ISO/IEC ISP 10613 the former method is used.
Notation and Conventions
A.2
A.2.1 Introduction
In many cases the constraints imposed by the IPRL are expressed in the form of Symbols indicating the Status
in the context of this part of ISO/IEC ISP 10613 of those base Standard PICS proforma items to which the
constraints apply. The Symbols used are defined in the following two subclauses.
A.2.2 Notation for Static Conformance
The following Symbols are used to identify constraints on the capabilities to be supported by a conforming
implementation:
Symbols directly specifying Status:
a)
Symbol Meaning
mandatory
m
0 optional
X prohibited
not applicable
i out of scope, not relevant to this Profile
It should be noted that, in the context of received PDUs or fields or Parameters of received PDUs, the
capability to support them is the ability to interpret the significance of the PDU or field and act on it
in accordance with the dynamic conformance requirements of the protocol (which may in some cases
5

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SIST EN ISP 10613-1:1997
ISO/IEC ISP 10613-1: 1994(E)
0 ISO/IEC
mean generating an error report). PDUs or fields which are not supported are those whose receipt
ignored and has no impact on the protocol Operation.
Other associated notation
b)
c condi tional (see below)
citem>: condi tional (see below)
Symbols of the form c are used when the Status of an item is dependent on the support of other
items. In this case, is a number which refers to a definition at the end of the subclause in which
it is used. That definition specifies the conditional Status, which may, for example, be in a form such
as “if ABC then m else x ”, which would indicate that the Status is mandatory if the item in the PICS
proforma with reference ABC is supported, and otherwise is prohibited.
Symbols of the form : are used as an abbreviated way of expressing a condition wherein
the Status is as identified if the specified item is supported, and otherwise the Status is not applicable.
So, for example, “ABC:m” would be equivalent to a conditional Status “if ABC then m else - “.
A.2.3 Notation for Dynamit Conformance
In some cases it is necessary to specify constraints not only on the capabilities which are implemented, but on
whether they are used. When this is necessary the stak conformance Status Symbol from A.2.2.a) above is
followed by an additional Symbol to create a two-Character Status definition. The second Symbol specifies the
dynamic constraints, and the meanings are as follows:
Symbol Meaning
m mandatory
- the implementation is required to use the capability whenever applicable
0 optional
- use of the capability is optional
X prohibited
- use of the capability is not permitted
not applicable
i outside the scope of this ISP
disabling required
d
- use of the capability is not invariably prohibited but the implementation is required to
provide a means whereby it tan be disabled
indicated
for example, a Status of “mm” would mean that it is mandatory to provide the capability by the
Thus,
proforma item and that it is also mandatory to use that capability wherever applicable.
PICS
Where only a Single Status Character is used, it specifies the static requirement and indicates that no additional
constraint is placed upon the dynamic use of the capability.

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SIST EN ISP 10613-1:1997
0 ISO/IEC ISOIIEC ISP 10613=1:1994(E)
A3 l IPRL for ISO 8473
Since the base Standard does not itself have a PICS proforma, interim base Standard PICS proforma information
for an intermediate System is provided in annex B. When a standardized base Standard PICS proforma is
available, this part of ISO/IEC ISP 10613 will be revised to refer to it.
This part of ISO/IEC ISP 10613 imposes the following constraints:
Major Capabilities:
Capability Constraint
Intermediate System m
Supported Func tions:
Constraint
Base Item Function
iReas Reassemble PDU od
m
iPRR Partial route recording
i
iSecu Cs> Security
DT Parameters:
Parameter Constraint
I Base Item
Cs> Security
idSecu-s
I
cr> Security
idSecu-r
Partial route recording
idPRR-r
ER Parameters:
Parameter Constraint
Base Item
CS> Security 1
idSecu-s
cr> Security i
idSecu-r
m
idPRR-r Partial route recording

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SIST EN ISP 10613-1:1997
ISO/IEC ISP 10613=1:1994(E) 0 ISO/IEC
IPRL for ISO 9542
A.4
The relevant base Standard PICS proforma is the PICS proforma given in annex A of ISO 9542 for intermediate
Systems. This part of ISO/IEC ISP 10613 imposes the following constraints:
Protocol Function - Intermediate System:
Protocol Function Constraint
Base Item
1s configuration information support-
CI od
ed
PDU Fields - Intermediate System:
t
Rase Item PDU field Constraint
CS> Security i
scty-s
cr> Security i
Scty-r
8

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SIST EN ISP 10613-1:1997
0 ISO/IEC ISO/IEC ISP 10613=1:1994(E)
Annex B1)
(normative)
Assumed Base Standard PICS Proforma for ISO 8473 Intermediate System Operation
Bl . Introduction
This annex contains PICS proforma information assumed for ISO 8473 which does not already have an
intemationdly stable PICS proforma. This annex includes only such assumed PICS proforma items which are
relevant to the intermediate System Operation of ISO 8473.
The supplier of a protocol implementation which is claimed to conform to ISO 8473 intermediate System
Operation shall complete the following Protocol Implementation Conformance Statement (PICS) proforma.
A completed PICS proforma is the PICS for the implementation in question. The PICS is a Statement of which
capabilities and Options of the protocol have been implemented. The PICS tan have a number of uses, including
use
check-list to reduce the risk of failure to Standard
by the protocol implementor, as a
through oversight;
by the supplier and acquirer - or potential acquirer - of the implementation, as a detailed indication of
the capabilities of the implementation, stated relative to the common basis for understanding providecl
by the Standard PICS proforma;
or potential User - of the implementation, as a basis for initially checking the possibility
by the user -
of interworking with another implementation (note that, while interworking tan never be guaranteed,
failure to interwork tan often be predicted from incompatible PICSs);
by the protocol tester, as the basis for selecting appropriate tests against which to assess the Claim for
conformance of the implementation.
B2 . Abbreviations and Special Symbols
B.2.1 Status Symbols
M mandatory
optional
0
O. optional, but support of at least one of the group of Options labelled by the same numeral
is required
prohibited
X
: conditional-item Symbol, including predicate identification (see B.3.4)
1
logical negation, applied to a conditional item ’s predicate
~~
1) Copyright release for PICS proformas
Users of ISO/IEC ISP 10613 may freely reproduce the PICS proforma in this annex so that it tan be used for its intended
purpose and may further publish the completed PICS.
9

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ISO/IEC ISP 10613=1:1994(E)
0 ISO/IEC
B.2.2 Other Symbols
cr> receive aspects of an item
CD send aspects of an item
B3 . Instructions for Completing the PICS Proforma
General Structure of the PICS Proforma
B.3.1
The first part of the PICS proforma - Implementation Identification and Protocol Summary - is to be completed
as indicated with the information necessary to identify both the supplier and the implementation.
The main part of the PICS proforma is a fixed-format questionnaire divided into a number of major subclauses;
these tan be divided into further subclauses each containing a group of individual items. Answers to the
questionnaire items arc to be provided in the rightmost column, either by simply marking an answer to indicate
a restricted choice (usually Yes or No), or by entering a value or a set or range of values.
NOTE - There are some items for which two or more choices f?om a set of possible answers tan All relevant choices
arc to be marked in these cases.
Esch item is identified by an item reference in the first column; the second column contains the question to be
answered; and the third column contains the reference or references to the materi ’al that specifies the item in the
main body of ISO 8473. The remaining columns record the Status of the item - whether support is mandatory,
optional, prohibited or conditional - and provide the space for answers (see also B.3.4).
A supplier may also provide further information, categorized as either Additional Information or Exception
Information. When present, each kind of further information is to be provided in a further subclause of items
labelled Aci> or E, respectively, for Cross-referencing purposes, where ci> is any unambiguous identification
for the item (e.g., a number); there are no other restrictions on its format or presentation.
A completed PICS proforma, including any Additional Information or Exception Information, is the Protocol
Implementation Conformance Statement for the implementation in question.
NOTE - Where an implementation is capable of being configured in more than one way, a Single PICS may be able to
describe all such configurations. However, the supplier has the choice of providing more than one PICS, each
covering some subset of the implementation ’s configuration capabilities, in cases where this makes for easier and
clearer presentation of the information.
Additional Information
B.3.2
Items of Additional Information allow a supplier to provide further information intended to assist the
interpretation of the PICS. It is not intended or expected that a large quantity will be supplied, and a PICS may
be considered complete without any such information. Examples might be an outline of the ways in which a
(Single) implementation tan be set up to operate in a variety of environments and configurations; or a brief
rationale - based perhaps upon specific application needs - for the exclusion of features which, although optional,
are nonetheless commonly present in implernentations of this protocol.
References to items of Additional Information may be entered next to any answer in the questionnaire, and may
be included in items of Exception Information.
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Exception Information
B.3.3
It may occasionally happen that a sup
...