ISO/IEC 8881:1989

Name: ISO/IEC 8881:1989 — Information processing systems — Data communications — Use of the X.25 packet level protocol in local area networks
SKU: ISO/IEC 8881:1989
Price: 10800 RUB
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Information processing systems — Data communications — Use of the X.25 packet level protocol in local area networks

Название (английский):

ISO/IEC 8881:1989

Information processing systems — Data communications — Use of the X.25 packet level protocol in local area networks

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 23 ноября 1989 г.
Издание:: ISO/IEC IS 8881 edition 1 version 1
ICS:: 35.100.30

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Цена:10 800 ₽

Описание (английский):

Deals with the use of the X.25 Packed Level Protocol (PLP) as defined in ISO 8280 operating over ISO 8802 Local Area Networks (LANs). The operation of the X.25/PLP using the Logical Link Control (LLC) Type 2 procedures is described in section 2. The operation of the X.25/PLP using the LLC Type 1 procedures is specified in section 3. To be used in compliance with the standards ISO 7498:1984; ISO 8208:1987; ISO 8208/Add. 1: ISO 8343/Add. 2:1988; ISO 8802-2; ISO 8878:1987; ISO/IEC/TR 10029:1989.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO/IEC 8881:1989 specifies how the X.25 Packet Level Protocol (PLP) is used over IEEE-style Local Area Networks (LANs) based on ISO 8802. It describes the operation of X.25/PLP (as defined in ISO 8208) when carried on LAN data links and defines two modes of operation using the Logical Link Control (LLC) sublayer: LLC Type 2 (section 2) and LLC Type 1 (section 3). The standard focuses on protocol adaptation, addressing, restart/clear procedures and parameter choices required to run connection-mode X.25 services in a LAN environment.

Key topics and requirements

X.25 PLP over LANs: Specifies how the ISO 8208 Packet Level Entity maps to an ISO 8802 Local Area Network environment.

LLC operation modes: Details behavior for both LLC Type 2 procedures (acknowledged connection-mode LLC) and LLC Type 1 procedures (unacknowledged LLC), including optional interoperability guidance.

Addressing and SNPA use: Uses LAN MAC addresses and Subnetwork Point of Attachment (SNPA) concepts to determine which virtual circuits to clear or restart.

Restart and broadcast procedures: Defines a LAN-equivalent restart mechanism (broadcast RESTART REQUEST / RESTART CONFIRMATION) to clear virtual calls on a DTE and how receivers must validate such broadcasts using MAC/SNPA addressing.

Packet sizing and flow control: Allows the definition of nonstandard default packet sizes to better match LAN MTUs; such sizes are constrained (reduced to the nearest multiple of 128 octets where applicable) and interact with flow-control and negotiation facilities (Flow Control Parameter, On-line Facility).

Timers and retransmission: Requires sensible timer and retransmission parameter selection adapted to LAN characteristics while preserving required relationships between time limits (no specific default values are introduced beyond those in ISO 8208).

Conformance guidance: Systems may optionally implement Section 3 (LLC Type 1) to interoperate with implementations that do not conform fully to this International Standard.

Applications

Deploying legacy X.25-based connection services across Ethernet or Token Ring LANs

Integrating X.25 virtual circuit management with LAN addressing and MAC-level behaviors

Designing gateway or DTE devices that bridge X.25 packet services and LAN media

Network administrators tuning packet size, timers and restart behavior for improved LAN performance

Related standards

ISO 8208 (X.25 Packet Level Protocol)

ISO 8802 / ISO 8802-2 (Local Area Network - MAC & LLC)

ISO 7498 (OSI Basic Reference Model)

ISO 8348/Add.2 (Addressing)

ISO 8878, ISO/IEC/TR 10029 and other referenced ISO/IEC documents for conformance and operational guidance

Keywords: ISO/IEC 8881:1989, X.25, PLP, LAN, LLC Type 1, LLC Type 2, ISO 8208, ISO 8802, packet-level protocol, restart procedure, MAC address, SNPA.

ISO/IEC 8881:1989

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Who should use this standard

Related standards

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