ISO/IEC 8473-3:1995

Name: ISO/IEC 8473-3:1995 — Information technology — Protocol for providing the connectionless-mode network service: Provision of the underlying service by an X.25 subnetwork
SKU: ISO/IEC 8473-3:1995
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Information technology — Protocol for providing the connectionless-mode network service: Provision of the underlying service by an X.25 subnetwork

Название (английский):

ISO/IEC 8473-3:1995

Information technology — Protocol for providing the connectionless-mode network service: Provision of the underlying service by an X.25 subnetwork

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 2 марта 1995 г.
Издание:: ISO/IEC IS 8473 edition 1 version 1
ICS:: 35.100.30

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Описание (английский):

Specifies the way in which the underlying service assumed by the protocol defined by ITU-T Rec. X.233 ISO/IEC 8473-1 is provided by a subnetwork that conforms to ITU-T Recommendation X.25 through the operation of a Subnetwork Dependent Convergence Function (SNDCF) as described in ISO/IEC 8648. Also provides the PICS proforma for this protocol, in compliance with the relevant requirements and in accordance with the relevant guidance.

Abstract

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Стандарты, упомянутые в описании

Overview

ISO/IEC 8473-3:1995 is an international standard published by ISO and IEC that specifies how the connectionless-mode network protocol (CLNP) operates over an X.25 subnetwork. Developed by ISO/IEC Joint Technical Committee 1 (JTC 1) in collaboration with ITU-T, this standard facilitates interoperability in open systems by detailing the provision of the underlying service required by ISO/IEC 8473-1 (ITU-T Rec. X.233) using a Subnetwork Dependent Convergence Function (SNDCF) as described in ISO/IEC 8648.

Additionally, ISO/IEC 8473-3 includes a PICS (Protocol Implementation Conformance Statement) proforma, providing a methodology for manufacturers and developers to state the implemented protocol features, thereby supporting consistent implementation and conformance assessment across the industry.

Key Topics

Connectionless-mode Network Protocol (CLNP) over X.25: Defines the mapping of the CLNP services onto a subnetwork that uses the X.25 Packet Layer Protocol.

Subnetwork Dependent Convergence Function (SNDCF): Details the key role of SNDCF for adapting CLNP to the X.25 connection-oriented environment.

Service Data Unit Handling: Outlines requirements for the minimum size (512 octets) and transparent transfer of user data between subnetwork points.

Virtual Circuit Management: Explains the mechanisms for virtual circuit establishment, usage, clearing, collision resolution, and the use of multiple virtual circuits for enhanced throughput or resilience.

Addressing and Protocol Discrimination: Specifies use of X.25 DTE addresses (e.g., per X.121) for source and destination, and how protocol identification is established within packets.

Quality of Service (QoS), Priority, and Timeout Management: Addresses optional use of priorities, timeout policies for connection management, and local criteria for circuit handling.

Conformance and PICS Proforma: Provides a structured proforma for protocol conformance assessment in line with CCITT Rec. X.290 / ISO/IEC 9646-1.

Applications

ISO/IEC 8473-3:1995 serves as a foundational specification for:

Network Equipment Vendors: Ensuring interoperability and reliable implementation of products that deliver the connectionless-mode network service over legacy X.25 infrastructures.

Telecommunications Networks: Facilitating integration of open systems interconnection (OSI) protocol stacks with X.25 public data networks, supporting established enterprise and governmental networking environments.

Protocol Conformance Testing: Through the included PICS proforma, organizations can systematically declare which protocol features are present, supporting procurement, testing, and troubleshooting.

Migration and Coexistence: Enables legacy X.25 infrastructures to coexist with newer network layer protocols, supporting gradual migration in large-scale or critical environments.

Related Standards

Implementations and users of ISO/IEC 8473-3:1995 should also be familiar with the following associated standards:

ISO/IEC 8473-1 (ITU-T Rec. X.233) – General specification of the connectionless-mode network protocol (CLNP).

ITU-T Recommendation X.25 / ISO/IEC 8208 – Packet Layer Protocol and interface specifications for X.25 networks.

ISO/IEC 8648 – Internal Organization of the Network Layer: specifies SNDCF details.

ISO/IEC 7498-1 (ITU-T X.200) – OSI Basic Reference Model: defining network layer concepts and terminology.

ISO/IEC 8348 (ITU-T X.213) – OSI Network Service Definition.

ISO/IEC 9646-1 (ITU-T X.290) – Conformance testing methodology and framework.

By leveraging ISO/IEC 8473-3, organizations ensure the robust provision of OSI connectionless-mode services over X.25, enhancing compatibility, reliability, and longevity of critical communication infrastructures.

ISO/IEC 8473-3:1995

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

ISO/IEC 8473-1:1998

Information technology — Protocol for providing the connectionless-mode network service: Protocol specificati…

ISO/IEC 9646-1:1994

Information technology — Open Systems Interconnection — Conformance testing methodology and framework — Part…

BS ISO/IEC 10177:1993

Information technology. Telecommunications and information exchange between systems. Provision of the connect…

ISO/IEC 7498-1:1994

Information technology — Open Systems Interconnection — Basic Reference Model: The Basic Model

ISO/IEC 8348:2002

Information technology — Open Systems Interconnection — Network service definition