ISO/IEC 9041-1:1997 情報技術—オープンシステム相互接続—仮想端末基本クラスプロトコル—パート1：仕様 | ページ 2

3.1 グローバル OSI 定義

ISO/IEC 9041 のこの部分は、ISO/IEC 7498 で開発された概念に基づいており、そこで定義されている次の用語を使用しています。

• 1)アプリケーションエンティティ。
• 2)アプリケーション層。
• 3)プロトコルデータユニット。
• 4)ユーザー要素。次の用語の定義は、ISO/IEC 10731 に記載されています。
• 5)プリミティブ。
• 6)確認 (プリミティブ);
• 7)指示 (プリミティブ);
• 8)リクエスト (プリミティブ);
• 9)応答 (プリミティブ);
• 10)サービスプロバイダー;
• 11)サービス利用者。

Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO and 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 infields 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 JTC1. 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 9041-1 was prepared by Joint Technical Committee ISO/IEC JTC1, Information technology, Subcommitee SC21, Open systems interconnection, data management and open distributed processing.

This second edition cancels and replaces the first edition (ISO/IEC 9041-1:1990), which has been technically revised. It also incorporates Amendment 2:1992, Technical Corrigendum 1:1992 and Technical Corrigendum 2:1993.

ISO/IEC 9041 consists of the following parts, under the general title Information technology — Open Systems Interconnection — Virtual Terminal Basic Class Protocol:

• Part 1: Specification
• Part 2: Implementation Conformance Statement (PICS) Proforma

Annexes A and B form an integral part of this part of ISO/IEC 9041.

Introduction

ISO/IEC 9041 is one of a set of International Standards produced to facilitate the interconnection of computer systems. It is related to other International Standards in the set as defined in the Reference Model for Open Systems Interconnection (ISO/IEC 7498-1). The Reference Model subdivides the area of standardization for interconnection into a series of layers of specification, each of manageable size.

This part of ISO/IEC 9041 defines the manner in which two protocol machines (called Virtual Terminal Protocol Machines or VTPMs) in the Application Layer of the Reference Model for Open Systems Interconnection communicate in order to provide the Virtual Terminal Basic Class Service defined in ISO/IEC 9040 making use of the Presentation Layer and of the association control service of ACSE within the Application Layer.

Part 2 of ISO/IEC 9041 includes the Protocol Implementation Conformance Statement (PICS) proforma for the Virtual Terminal Basic Class Protocol as defined in this part of ISO/IEC 9041.

1 Scope

This part of ISO/IEC 9041 specifies:

• a) a set of procedures for the connection-oriented transfer of data, control and reference information between protocol machines which implement the functions of a provider of the Basic Class Virtual Terminal Service;
• b) the two modes in which those procedures operate;
• c) the structure of protocol elements used for the transfer of data and control Information and the mapping of these protocol elements onto ACSE and lower layer services;
• d) the means of negotiating the functional units to be used by the protocol machines and the parameters of the service;
• e) the structure and mapping of protocol elements used for the transfer of data and control information.The procedures are defined in terms of:
• f) the interactions between Virtual Terminal Protocol Machines through the exchange of Virtual Terminal protocol elements;
• g) the Interactions between a Virtual Terminal Protocol Machine and the Virtual Terminal service user in the same system through the exchange of Virtual Terminal service primitives;
• h) the interactions between a Virtual Terminal Protocol Machine and the ACSE and Presentation Service providers through the exchange of service primitives.

This part of ISO/IEC 9041 also specifies conformance requirements (see clause 13) for systems implementing these procedures. It does not contain tests which can be used to demonstrate this conformance.

These procedures are applicable to instances of communication between systems that support the Basic Class Virtual Terminal Service in the Application Layer of the Reference Model for Open Systems Interconnection and which wish to interconnect in an open systems environment.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO/IEC 9041. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO/IEC 9040 are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards.

3 Definitions

3.2 Association Control Service Element definitions

This part of ISO/IEC 9041 makes use of the following terms defined in ISO/IEC 8649:

• 1) application association;
• 2) application context.

3.3 Presentation Layer Service Element definition

This part of ISO/IEC 9041 makes use of the term abstract syntax which is defined in ISO/IEC 8822.

3.4 Virtual Terminal Service definitions

This part of ISO/IEC 9041 uses the following definitions contained in ISO/IEC 9040:

• 1) A-mode, Asynchronous Mode;
• 2) access-rule;
• 3) Application VT-user;
• 4) Block;
• 5) character-box graphic element;
• 6) Context Control Object (CCO);
• 7) current-VTE;
• 8) draft-VTE;
• 9) Field;
• 10) Field Definition Control Object (FDCO);
• 11) Field Definition Record (FDR);
• 12) Field Element;
• 13) Field Entry Condition (FEC);
• 14) Field Entry Event (FEE);
• 15) Field Entry Instruction (FED;
• 16) Field Entry Instruction Control Object (FEICO);
• 17) Field Entry Instruction Record (FEIR);
• 18) Field Entry Pilot Control Object (FEPCO);
• 19) Field Entry Pilot Record (FEPR);
• 20) Field Entry Reaction (FER);
• 21) full-VTE;
• 22) Initial Facility Set;
• 23) net-effecting;
• 24) Reference Information Object (RIO);
• 25) repertoire;
• 26) ripple.
• 27) S-mode, Synchronous Mode;
• 28) Terminal VT-user;
• 29) Transmission Policy Control Object (TPCO);
• 30) VT-assoclation;
• 31) VT-context-value;
• 32) VT-envlronment (VTE);
• 33) VT-user;
• 34) VTE-parameter;

3.5 Virtual Terminal Protocol definitions

For the purposes of this part of ISO/IEC 9041 the following definitions apply.