ISO/IEC 10732:1993

Information technology — Use of X.25 Packet Layer Protocol to provide the OSI connection-mode Network Service over the telephone network

Applies to environments including telephone network leased circuit connection between two DTEs; telephone network switched connection between two DTEs; DTE access to a PSDN via a telephone network leased circuit connection; DTE access to a PSDN via a telephone network switched connection. Provision is achieved by specifying the mapping of the CONS primitives and parameters to and from the elements of the protocols used.

Technologies de l'information — Utilisation du protocole X.25 de couche de paquet pour fournir le service réseau OSI en mode connexion sur le réseau téléphonique

General Information

• Status: Published
• Publication Date: 27-Apr-1993
• 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: 06-May-1999

Relations

• Consolidated By: ISO 9241-8:1997 - Ergonomic requirements for office work with visual display terminals (VDTs) — Part 8: Requirements for displayed colours
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 10732
First edition
1993-05-01
Information technology - Use of X.25
Packet Layer Protocol to provide the OSI
connection-mode Network Service over
the telephone network
Technologies de I ’informa tion- Utilisation du protocole X.25 de couche
de paquet pour foumir Ie Service r&eau OS/ en mode connexion sur Ie
rbseau tMphonique
Reference number
ISO/IEC 10732:1993(E)

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ISCMEC 10732 : 1993 (E)
Contents
Page
1
Scope .
1
Normative references .
2
Definitions .
3
Abbreviations .
Overview . 3
.............................................................. 5
Control of underlying connections
6
Data link layer .
6
Packet layer .
Annex A Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
0 lSO/IEC 1993
All rights reserved. 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.
ISO/IEC Copyright Office l Gase postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii

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ISO/IEC10732:1993(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International
Electrotechnical Commission) form the specialized System for worldwide standardiz-
ation. 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. 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 10732 was prepared by Joint Technical Committee
ISO/IEC JTC 1, Information technology, in collaboration with the CCITI ’. The identical
text is published as CCITI’ Recommendation X.614.
. . .
111

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ISO/IEC 10732 : 1993 (E)
INTERNATIONAL STANDARD
CCITT RECOMMENDATION
INFORMATION TECHNOLOGY - USE OF X.25 PACKET LAYER PROTOCOL
TO PROVIDE THE OS1 CONNECTION-MODE NETWORK SERVICE
OVER THE TELEPHONE NETWORK
1 Scope
This CCITT Recommendation I International Standard is applicable to the environments where the X.25 packet layer
protocol, as standardized in (PLP) ISO/lEC 8208, is operated over a telephone network connection to provide the OS1
Connection-mode Network Service (CONS). These environments include
telephone network leased circuit connection between two DIES;
b) telephone network switched connection between two DES;
c) DIE access to a PSDN via a telephone network leased circuit connection; and
d) DTE access to a PSDN via a telephone network switched connection.
This Provision is achieved CONS primitives and Parameters to and from the elements
specifying the mapping of the
bY
of the protocols used.
,
2 Normative references
The following CCITT Recommendations and International Standards contain provisions which, through reference in
this text, constitute provisions of this Recommendation I International Standard. At the time of publication, the editions
indicated were vahd. All Recommendations and Standards are subject to revision and Parties to agreements based on
this Recommendation I International Standard are encouraged to investigate the possibility of applying the most recent
edition of the Recommendations and Standards listed below. Members of IEC and ISO maintain registers of currently
valid International Standards. The CCITT Secretariat maintains a list of the currently valid CCITT Recommendations.
21 . Identical Recommendations I International Standards
-
CCITT Recommendation X.213 (1992) I ISO/IEC 8348:1993, Information technology - Network Service
definition for Open Systems Interconnection.
22 .
Paired Recommendations I International Standards equivalent in technical content
-
CCITT Recommendation X.200 (1988), Reference Model of Open Systems Interconnection for CCIIT
Applications.
Open Systems Interconnection - Basic Reference
ISO 7498:1984, Information processing systems -
Model.
-
CCITT Recommendation X.210 (1988), Open Systems Interconnection Layer Service Definition
Conventions.
ISO/TR 8509: 1987, Information processing systems - Open Systems Interconnection - Service
Conventions.
-
CCITT Recommendation X.223 (1988), Use of X.25 to provide the OSI connection-mode network
Service for CCITT applications.
ISO 8878:1987, Information processing systems - Data communications - Use of X.25 to provide the
OSI Connection-Mode Network Service.
CCITT Rec. X.614 (1992 E) 1

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ISOIIEC 10732 : 1993 (E)
. Additional references
23
- CCITT Recommendation V.25 (1988), Automatic answering equipment and/or parallel automatic
calling equipment on the general switched telephone network including procedures for disabling of echo
control devices for both manually and automatically established calls.
-
CCITT Recommendation V.25 bis (1988), Automatic calling and/or answering equipment on the
general switched telephone network (GSTN) using the IOO-Series interchange circuits.
- CCITT Recommendation X.25 (1988), Interface between data terminal equipment (DTE) and data
circuit-terminating equipment (DCE) for terminals operating in the packet mode and connected to
public data networks by dedicated circuit.
- CCITT Recommendation X.32 (1988), Interface between data terminal equipment (DTE) and data
circuit-terminating equipment (DCE) for terminals operating in the packet mode and accessing a packet
switched public data network through a public switched telephone network or an integrated Services
digital network or a circuit switched public data network.
-
ISO 7776~1986, Information processing systems - Data communication - High-level data link control
procedures - Description of the X.25 LAPB-compatible DTE data link procedures.
-
Data communications - X.25 Packet Layer Protocol for
ISO/IEC 8208: 1990, Information technology -
Data Terminal Equipment.
Definitions
3
For the purposes of this Recommendation I International Standard, the following definitions apply.
31 b Reference model definitions
This Recommendation I International Standard makes use of the following temx defined in CCITT Recommen-
dation X.200 I ISO 7498:
a) Network Connection;
b) Network Layer;
c) Network Service.
Service conventions definitions
32 .
This Recommendation I International Standard makes use of the following terms defined in CCITT Recommen-
dation X.210 I ISO/TR 8509:
Network Service
provider;
a)
Network Service
User.
b)
33 0 Network Service definitions
This Recommendation I International Standard makes use of the following temx, defined in CCITT Recommen-
dation X.213 I ISO/EC 8348:
a) N-CONNECT request;
b) N-DISCONNEET indication.
34 0
X.25 definitions
This Recommendation I International Standard makes use of the following terms defined in KITT Recommen-
dation X.25 and ISO/EC 8208:
a) Data circuit-terminating equipment;
Data terminal equipment;
b)
c) Registration packet;
d) Virtual call.
2 CCITT Rec. X.614 (1992 E)

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ISO/IEC 10732 : 1993 (E)
4 Abbreviations
41 . Reference model abbreviations
NL Network Layer
NS Network Service
OS1 Open Systems Interconnection
42 . Network Service abbreviations
CONS Connection-mode Network Service
NSAP Network Service access Point
Quality of Service
QOS
SNPA Subnetwork Point of attachment
43 . X.25 abbreviations
DCE Data circuit-terminating equipment
DTE Data terminal equipment
HIC Highest incoming channel
HOC Highest outgoing channel
HTC Highest two-way channel
LAPB Link access procedure - balanced
LIC Lowest incoming channel
LOC Lowest outgoing channel
LTC Lowest two-way channel
PLP Packet layer protocol
44 . Other abbreviations
PSDN Packet switched data network (public or private)
5 Overview
There are two basic configurations where the X.25 packet layer protocol (PLP), as standardized in ISO/IEC 8208, may
be operated over a telephone network connection to provide the OS1 Connection-mode Network Service (CONS)
defined in CCITT Rec. X.213 I ISO/IEC 8348.
The first configuration is shown in Figure la) where two X.25 DTEs are directly connected by a telephone network
connection. In this case each DTE operates the DTE/DTE mode of ISO/IEC 8208 (X.25 PLP) and ISO 7776 (X.25
LAPB). The telephone network connection may be a leased circuit or switched.
The second configuration is shown in Figure Ib) where an X.25 DTE accesses a PSDN. In this case the DTE operates
the DTE/DCE mode of ISO/IEC 8208 (X.25 PLP) and ISO 7776 (X.25 LAPB). When the telephone network
connection is a leased circuit this configuration is a regular X.25 scenario, while it relates to X.32 when the telephone
network connection is switched.
CCITT Rec. X.223 I ISO 8878 specifies the method for providing the OSI Connection-mode Network Service (CONS)
through the use of the X.25 packet layer protocol (PLP). CCITT Rec. X.223 I ISO 8878 covers the case of an
X.25 DTE directly connected to another DTE or directly connected to a packet switched data network. When a
switched telephone network connection is introduced into the path between the DTEs or between the DTE and a
PSDN, a few provisions additional to those contained in CCITT Rec. X.223 I ISO 8878 are necessary. These additional
provisions for a DTE connected to the switched telephone network are specified by this Recommendation I
International Standard.
CCITT Rec. X.614 (1992 E) 3

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ISO/IEClO732:1993(E)
,
Telephone
DTE
DTE
network
a) Configuration for DTE-to-DTE operation
t l
Telephone
PSDN
DTE
network
1
Y ’
TIS00610-92
b) Conjiguration for DTE-to-PSDN Operation
Figure 1 - Configurations
The applicable protocol Stack is given in Figure 2. The X.25 PLP is used to convey all elements of all three phases of
the OS1 CONS. CCITT Rec. X.223 I ISO 8878 applies with regard to the mapping of the CONS primitives and
Parameters to the elements of the X.25 PLP. However, in certain cases discussed in the clauses below, additional
provisions apply before these mappings tan
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