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BS ISO/IEC 10177:1993

Current
Current

The latest, up-to-date edition.

Information technology. Telecommunications and information exchange between systems. Provision of the connection-mode Network internal layer service by intermediate systems using ISO/IEC 8208, the X.25 Packet Layer Protocol
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

10-15-1993

Foreword
Introduction
1. Scope
2. Normative references
3. Definitions
4. Abbreviations
5. Overview and principles of the protocol mapping
6. Conformance
7. General considerations in mapping Network connections
8. Protocol mapping for NC establishment and release
9. Protocol mapping for data transfer phase
10. SNDCP for use of Permanent Virtual Circuits
Annexes
A. PICS Proforma
B. Modified PICS requirements for ISO/IEC 8208
C. Illustration of processing of Transit Delay QOS

Specifies the method by which a Network layer interworking unit (IWU) uses the X.25 packet layer protocol specified in ISO/IEC 8208 to support the OSI connection mode Network service. Does not specify any requirements relating to the exchange of routing information or layer management information between an IWU and other systems. Coverage includes definitions, abbreviations and conformance. Also includes detailed annexes.

This International Standard specifies the method by which a Network-layer interworking unit (IWU) uses the X.25 packet layer protocol specified in ISO/IEC 8208 to support the OSI connection-mode Network service. The specification is expressed in terms of a mapping between the Network internal layer service defined in ISO/IEC 10028 and the Virtual Call (VC) and Permanent Virtual Circuit (PVC) services of the X.25 packet layer protocol.

An IWU to which this International Standard applies interconnects, for any individual Network connection, two real subnetworks, at least one of which is accessed using the X.25 packet layer protocol. When both subnetworks are accessed using the X.25 packet layer protocol, the specification applies independently to the IWU\'s operation on each subnetwork.

In addition, this International Standard uses ISO/IEC 10028\'s definition of the relaying functions of an intermediate system to extend its application beyond a single subnetwork point of attachment, to specify the requirements to be met by an IWU as a whole in supporting the OSI connection-mode Network service.

This International Standard covers operation of the X.25 packet layer protocol that is compatible with the 1984 and later versions of CCITT Recommendation X.25, and that is compatible with the 1980 version of X.25 when the Permanent Virtual Circuit service is used; compatibility with the 1980 version of X.25 for Virtual Calls is outside the scope of this International Standard.

To enable use of the PVC service, this International Standard defines a set of subnetwork dependent convergence protocol (SNDCP) procedures. These allow a given PVC to to support one Network connection at a time, but to support different Network connections, with the same or different values for address and quality of service parameters, etc, at different times. The procedures also allow for the possibility of using a PVC in support of other protocols, but not simultaneously with these procedures (apart from transient collision cases, which do not fail unnecessarily).

To evaluate conformance of a particular implementation, it is necessary to have a statement of which capabilities and options have been implemented. Such a statement is called a Protocol Implementation Conformance Statement (PICS), as defined in ISO/IEC 9646-1. This International Standard provides the PICS proforma in compliance with the relevant requirements, and in accordance with the relevant guidance, given in ISO/IEC 9646-2.

This International Standard does not specify any requirements relating to the exchange of routing information or layer-management information between an IWU and other systems.

Committee
IST/6
DevelopmentNote
Supersedes 90/67534 DC. (07/2005)
DocumentType
Standard
Pages
38
PublisherName
British Standards Institution
Status
Current

Standards Relationship
ISO/IEC 10177:1993 Identical

ISO/IEC 9646-2:1994 Information technology Open Systems Interconnection Conformance testing methodology and framework Part 2: Abstract Test Suite specification
ISO/IEC 8348:2002 Information technology Open Systems Interconnection Network service definition
ISO/IEC 8878:1992 Information technology Telecommunications and information exchange between systems Use of X.25 to provide the OSI Connection-mode Network Service
ISO/IEC 9646-1:1994 Information technology Open Systems Interconnection Conformance testing methodology and framework Part 1: General concepts
ISO/IEC 8208:2000 Information technology Data communications X.25 Packet Layer Protocol for Data Terminal Equipment
ISO/IEC 10028:1993 Information technology Telecommunications and information exchange between systems Definition of the relaying functions of a Network layer intermediate system

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