ISO/IEC 8882-1:1996

Information technology - Telecommunications and information exchange between systems - X.25 DTE conformance testing - Part 1: General principles

Defines the testing of a DTE operating at the Data Link Layer and at the Packet Layer when accessing, by means of a dedicated path connection, switched or permanent, a public or private packet-switched network conforming to CCITT Recommendation X.25 or another DTE conforming to ISO/IEC 7776 and ISO/IEC 8208.

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Essais de conformité X.25 DTE — Partie 1: Principes généraux

General Information

• Status: Published
• Publication Date: 18-Sep-1996
• ICS: 35.100.20 - Data link layer
• 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
• Start Date: 13-Aug-2001
• Completion Date: 30-Oct-2025

Relations

• Revises: ISO/IEC 8882-1:1993 - Information technology - Telecommunications and information exchange between systems - X.25 DTE conformance testing - Part 1: General principles
• Effective Date: 15-Apr-2008

Overview

ISO/IEC 8882-1:1996 - "Information technology - X.25 DTE conformance testing - Part 1: General principles" defines the framework and principles for testing Data Terminal Equipment (DTE) that access packet‑switched networks (public or private) by dedicated switched or permanent paths conforming to CCITT Recommendation X.25 or when interfacing to another DTE conforming to ISO/IEC 7776 and ISO/IEC 8208. This part describes the testing philosophy, test-suite structure, selection rules and the controlled test environment; the actual Data Link Layer and Packet Layer test suites appear in Parts 2 and 3.

Key topics and requirements

• Scope and intent
  • Tests verify external behaviour of a DTE at the Data Link Layer and Packet Layer; they do not measure performance, diagnostics, internal implementation, or correctness of the protocol specification itself.
• Conformance test structure
  • Test suites are organized into Test Groups and Test Subgroups (e.g., proper, improper, inopportune PDUs) and composed of individual test cases.
  • Test selection is driven by the IUT’s PICS (Protocol Implementation Conformance Statement) and PIXIT (extra information for testing).
• Methodology
  • Uses the Remote Single‑layer (RS) test method, requiring the tester to simulate or respond to higher‑layer protocol interactions.
  • Data transfer testing uses the concept of sub‑functions (selected subsets of higher‑layer PDUs and capabilities) to enable predictable, repeatable exchanges.
• Notation and tooling
  • Test notation follows TTCN (Tree and Tabular Combined Notation) as defined in ISO/IEC 9646-2.
• Operational considerations
  • Controlled test environment, clear separation of test activity from normal device operation, and tester capabilities (e.g., timeout handling, transparent responses to retransmissions).
• Limitations
  • No exhaustive testing of optional facilities or new X.25 (1988) extra functions; optional features are tested individually where supported.

Applications and users

• Who uses it
  • Test laboratories, test evaluators, device designers/implementers, network integrators and operators supporting legacy X.25 services.
• Practical uses
  • Verifying interoperability of DTEs with X.25 DCEs or other DTEs (ISO/IEC 7776 / ISO/IEC 8208).
  • Supporting product conformance assessment, pre‑certification testing, regression testing during development, and legacy system integration.

Related standards

• CCITT/ITU‑T X.25 (1980, 1984, 1988)
• ISO/IEC 7776 (X.25 LAPB‑compatible Data Link)
• ISO/IEC 8208 (X.25 Packet Layer Protocol)
• ISO/IEC 9646 (TTCN and conformance testing methodology)

Keywords: ISO/IEC 8882-1, X.25 DTE conformance testing, data link layer, packet layer, TTCN, PIXIT, PICS, RS method, ISO/IEC 8208, ISO/IEC 7776.

Standards Content (Sample)

lSO/IEC
INTERNATIONAL
STANDARD 8882-l
Second edition
1996-09-I 5
Information technology -
Telecommunications and information
exchange between systems - X.25 DTE
conformance testing -
Part I:
General principles
Technologies de I ‘information - TGl&ommunications et 6change
d’information entre systemes - Essais de conformit X.25 DTE -
Partie I: Principes g&Graux
ISO/IEC 8882-l : 1996(E)
Foreword
IS0 (the International Organization for Standardization) and IEC (the International
Electrotechnical Commission) form the specialized system for worldwide stan-
dardization 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 mutual interest.
Other international organizations, governmental and non-governmental, in liaison
with IS0 and IEC. also take part in the work.
III the field of information technology, IS0 and IEC have established a joint
technical committee ISO/IEC JTC 1, Information technology. 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 ISOLIEC 8882-l was prepared by ISO/IEC JTC 1,
Subcommittee 6, Telecorrlrrlunications and information exchange between s!;stems.
This second edition cancels and replaces the first edition (ISOLIEC 8882-l: 1993)
of which it constitutes a technical revision.
ISO/IEC 8882 consists of the following parts, under the general title Information
.
terhnolo,g?T - Telecommunications and information exchange between systems -
X.25-DTE conformance testing:
- Part I: Geneml principles
__ Part 2: Data link layer conformance test suite
- Pa17 3: Packet layer conformance test suite
0 ISO/IEC 1996
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or
utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
ISO/IEC Copyright Office l Case postale 56 l CH-1211 Gen&e 20 l Switzerland
Printed in Switzerland
ISO/IEC 8882-l : 1996(E)
OIXYIEC
Introduction
ISO/IEC 8882 specifies a set of tests to evaluate Data Terminal Equipment (DTE)
conformance to International Standards ISO/IEC 7776 or ISO/IEC 8208. or both.
ISO/IEC 7776 and ISO/IEC 8208 allow for a DTE to interface with a Data
Circuit-Terminating Equipment (DCE) conforming to KITI Recommendation
X.25 ( 1980, 1984, 1988) or to another DTE conforming to ISO/IEC 7776 or
ISO/IEC 8208 or both. The implementations of ISO/IEC 7776 and ISWIEC 8208
are tested independently.
CCITT Ret ornmendations X.25( 1980). X.23 1984) and X.25( 1988) are written
from the perspective of a DCE and therefore do not explicitly specify the DTE
operation. However, recommended operation of DTEs is included by implication
because of the need to communicate with X.25 DCEs. Tests within ISO/IEC
8882-2 and ISO/IEC 8882-3 pertainin, (7 to X.25 ( 1980, 1984) are based on the
DTE operational characteristics implied by CCITI X.25. There are no test cases
within ISO/IEC 8882-2 and ISO/IEC 8882-3 for the extra functions and facilities
added in X.25( 1988).
This part of ISO/IEC 8882 specifies the framework in which the other parts of
ISO/IEC 8882 may be understood and the principles to be applied. The notation
used in ISO/IEC 8882-2 and ISO/IEC 8882-3 is TTCN as defined in ISO/IEC
9646-2.
ISO/IEC 8882-2 presents the Data Link Layer aspects for evaluating conformance
to ISO/IEC 7776 while ISO/IEC 8882-3 presents the Packet Layer aspects for
evaluating conformance to ISO/IEC 8208
The conformance tests are designed for use by
-.
test evaluators (responsible for analysing results and determining whet her
conformance has been achieved):
designers or implementors (for determining what tests are required
- test suite
and what results can and should be a nticipated by the test device J and
~ users implementing ISO/IEC 7776 or ISO/IEC 8208 or DTEs interfacing to
DCEs that implement CCITT X.25 (1980, 1984 or 1988) (for determining
the functionality required of their implementations to be considered in COII-
formance).
l . .
This page intentionally left blank

ISWIEC 8882-l : 1996(E)
INTERNATIONAL STANDARD OISOLIEC
Telecommunications and information
Information technology -
X.25-DTE conformance testing -
exchange between systems -
Part 1:
General principles
1 Scope ISO/IEC 8208 : 1995, Information technology - Data communi-
cations - X.25 Packet Layer Protocol for Data Terminal
ISO/IEC 8882 defines the testing of a DTE operating at the Equipment.
Data Link Layer and at the Packet Layer when accessing, by
NOTE - ISO/IEC 8208 : 1995 supersedes ISO/IEC 8208 : 1990. How-
means of a dedicated path connection, switched or permanent, a
ever, when this part of ISO/IEC 8882 was under development, the
public or private packet-switched network conforming to CCITI
previous edition was valid and this part of ISO/IEC 8882 is therefore
Recommendation X.25 or another DTE conforming to ISO/IEC
based on that edition, which is listed below.
7776 and ISWIEC 8208.
ISO/IEC 8208 : 1990, Information technology - Data communi-
The tests will test the conformance of an implementation by
cations - X.25 Packet Layer Protocol for Data Terminal Equipment.
observing its external behaviour. The conformance tests will
not test the DTE performance characteristics, the diagnostic and
ISO/IEC 8882-2 : 1995, In fomntion technology -L- Telemrww
maintenance functions, the correctness of the protocol itself, or
nications and infr,mntion e.uchmge between system - X. 2.5 DTE
DTE internal implementation, or the full capabilities as stated in
(1 - Put 2: Dut(l link ltr)*er conformm~e test
confomance testin,,
the PIGS.
suite.
This part of ISWIEC 8882
ISO/IEC 8882-3 : 1995, Information tecluwlogy - Telccorrw~r~-
-~ provides a general introduction;
nicntions and infomwtion exclmnge between system - X.25 DTE
conformance testin, 0 - Ptrrt .3: Ptrch-et ktrwr rnnfornimce test sr4itc
-- refers to those applicable International Standards;
ISO/IEC 9646-1 : 1994, Information technology - Open &stem
--- defines terms applicable to X.25DTE conformance testing;
Interconnection - Conf~mLw testin ,q nieth&logv md j~cuw-
work - Part 1: General concepts. (See also CCIKk RY~O~IIZWF
~- states the test case derivation and description; and
nation X.290 (1992)).
--- states the test methodology.
ISO/IEC: 9646-2 : 1994, Injkvwu~tion technology - Open Swterm
Interconnection - Conjimmmce testin, (p niethodolo~~~* cmi jkmie-
*
ISO/IEC 8882-l contains no statement of conformance. Specific
work -Part 2: Abstract Test Suite specifkntion. (See nlso CCITT
given in ISO/IEC 8882-2 and
statements of conformance are
Recommends tion X. 291 ( 1992)). ’
ISO/IEC 8882-j.
ISOIIEC 9646-3 : 1992, Information technology - Open S,;stem
Interconnection - Con fon;iance testin c rriethodolo~Y and $mic-
2 Normative references
work - Part 3: The Trtb md l%ulur &whined No&on (?TCN).
The following standards contain provisions which, through refer-
ence in this text, constitute provisions of this part of ISO/IEC 8882. CCITT Recommendation X.25 ( 1980) Znterfiice between Dtrtn Tcr*-
minal Equipment (DTE) nncl Data Cirmit-Teminnting Equipment
At the time of publication, the editions indicated were valid. All
standards are sub-ject to revision, and parties to agreements based (DCE) for Terminnls Optvuting in the Ptrcket Mode on Pddic Dtrttr
on this part of ISO/IEC 8882 are encouraged to investigate the Networks.
possibility of applying the most recent editions of the standards
indicated below. Members of IEC and IS0 maintain registers of
CCITI’ Recommendation X.25 ( 1984) Interfnce I>etween Dntn Ter-
.
currently valid International Standards.
minal Equipment (DTE) and Data Cir~lcit-Ter~?linttin,~ Equiprrwnt
(DCE) for Terminals Operwtin, 0 in the Pncket Mocle md Connecttd
ISOlIE(3 7498-l : 1994, Information technology - Open Systems
to Public Dnta Networks 1~ Dedirnted Cirmit.
In terconnertion - Basic Reference Model : The Basic Model.
ISO/IEC 7776 : 1995, Information technology - Telecormmni- CCITI’ Recommendation X.25 ( 1988) Interjkce lwtwen D(rt(r Ttjr-
c-xtions and infomntion exchange between systems - High-level minal Equipment (DTE) cud Ddtn Circuit-Terrrlinnting Eqttiprwnt
dnttr link control procedures - Description of the X.25 LAPB- (DCE) for Terminals Opcmting in the Ptrdet Mode crnd Connected
cmlpdble DTE dtrta link procedures. to Public Datn Networks by Dedkrted Circrd.
mw-IEC
ISO/IEC 8882-l : 1996(E)
3 Definitions A set of test cases that share a common
3.3.6 test subgroup:
characteristic, such as testing for proper, improper, or inopportune
PDLJs. A test subgroup is the smallest testable set of test cases
3.1 Reference model definitions
that can be selected.
This part of ISO/IEC 8882 makes use of the following term defined
in ISO/IEC 7498-l :
A subset of the PD1 Js and functional
3.3.7 sub-function:
capabilities of the protocol level above the ILJT that are needed to
(N)-protocol-data-unit (N)-PDU
allow data transfer testing to be accomplished.
3.2 Conformance testing definitions
4 Abbreviations
This part of ISO/IEC 8882 makes use of the following terms
defined in ISO/IEC 9646-l :
The following abbreviations are used in this part of ISO/IEC 8882:
Abstract Test Case
a> DCE Data Circuit-Terminating Equipment
Conformance Test Suite
b) DTE Data Terminal Equipment
Conformance Testing
(2 DXE DTE or DCE
Implement at ion LJnder Test
d)
IUT Implementation LJnder Test
Inopportune PDU
e>
PDU Protocol Data LJnit
Lower Tester
f)
PICS Protocol Implementation Conformance Statement
Protocol Implementation Conformance Statement
8) PIXIT Protocol Implementation extra Information for Test-
ing
Protocol Implementation extra Information for Testing
h)
RS Remote Single Layer
Remote Single Layer Test Method
i)
SLJT System LJnder Test
S ys tern Under Test
j)
TPDU Transport Protocol Data I Jnit
k) Test Group
TTCN Tree and Tabular Combined Notation
Test Step
1)
m) Test Suite
5 Test notation
The test notation used in ISO/IEC 8882-2 and ISWIEC 8882-3
3.3 X.25 DTE conformance testing definitions
is TTCN as defined in ISO/IEC 964663.
For the purposes of this part of ISO/IEC 8882, the following
definitions apply.
6 Test suite structure
The (N)-PDU whose syntax does not
3.3.1 improper PDU:
The test suite structure used in ISO/IEC 8882--2 and ISO/IEC
conform to the format specifications of ISO/IEC 7776 or ISO/IEC
8882-3 is defined in ISO/IEC 9646-2 and is illustrated below.
8208 or CCITT X.25.
Test Suite Structure
3.3.2 proper PDU: The (N)-PDU whose syntax conf
...