ITU-T F 581-1993 Guidelines for Programming Communication Interfaces (PCIs) Definition Service Recommendation《可编程通信接口(PCIs)定义的指南 业务建议 研究1组》.pdf
《ITU-T F 581-1993 Guidelines for Programming Communication Interfaces (PCIs) Definition Service Recommendation《可编程通信接口(PCIs)定义的指南 业务建议 研究1组》.pdf》由会员分享,可在线阅读,更多相关《ITU-T F 581-1993 Guidelines for Programming Communication Interfaces (PCIs) Definition Service Recommendation《可编程通信接口(PCIs)定义的指南 业务建议 研究1组》.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、ITU-T RECIN*F-SBL 93 W 4862571 0582204 T85 INTERNAT ONAL TELECOMMI ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU NICAT ON UNION F.581 (03/93) OPERATIONS AND QUALITY OF SERVICE DIRECTORY SERVICES GUIDELINES FOR PROGRAMMING COMMUNICATION INTERFACES (PCls) DEFINITION: SERVICE RECOMMENDATION ITU
2、-T Recommendation F.581 (Previously “CCITT Recommendation”) ITU-T RECMN*F.583 93 II 4862593 0582205 931 O FOREWORD The IT Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecom- munication Union. The IT-T is responsible for studying technical, operating an
3、d tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, p
4、roduce Recommendations on these topics. I3V-T Recommendation F.581 was prepared by the ITU-T Study Group I(l988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES 1 As a consequence of a reform process within the International Telecommunication Union (IT), the CC1-I ceased to exi
5、st as of 28 February 1993. In its place, the iT Telecommunication Standardization Sector (IT-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no c
6、hange has been made in the text to references containing the acronyms “CCITT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 telecommunication admini
7、stration and a recognized operating agency. In this Recommendation, the expression Administration” is used for conciseness to indicate both a O IT 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including phot
8、ocopying and microfilm, without permission in writing from the IT. - ITU-T RECMN*F.581 93 m Y862591 058220b 858 m CONTENTS Introduction 2.1 General 2.2 Applicability . Possible benefits of the PCIs 3.1 For implementors 3.2 For users . 3.3 For carriers EIS requirements 4.2 Dependency 4.3 Flexibility
9、4.4 Extensibility 4.5 Multiple applications 4.6 Easy implementation and testing 5.1 Location of the interface . ! . 5.2 Functional description 5.3 Formal description 5.4 Presentation of the information . General functional model . Application related interfaces . 7.1 Defuiitions 7.2 General features
10、 NetworWProtocol related interfaces . 8.1 Definition 8.2 General features scope 4.1 Independence General guidelines for defining PCIs . Annex A . Definitions Appendix I . Examples . Telefax 3 on PSTN . ISDN Lower Layer Module 1.1 1.2 Page 1 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 5 5 5 ITU-T RECMN*F
11、m58L 93 = 48b2591i 0582207 794 Recommendation F.581 GUIDELINES FOR PROGRAMMING COMMUNICATION INTERFACES (PCIs) DEFINITION: SERVICE RECOMMENDATION (Helsinki, 1993) 1 Introduction 1.1 Today, telecommunication needs in the microcomputer world are quickly increasing. -T senices are defined to meet these
12、 needs, but due to the technical and commercial context of the microcomputer world some concrete problems may arise. a) Techicd uspects In some implementations communication equipment may be composed of hardware and software modules which come from various manufacturers. These modules must exchange
13、information to provide the user with access to ITU-T services, but manufacturers may use different working methods and vcicahularies. Therefore, adding new software and hardware to existing configurations involves very detailed knowledge of different areas: telecommunication aspects, computer aspect
14、s, hardware and software aspects. Setting up such equipment requires the help of experts, whereas using ITU-T services only requires a very basic knowledge of the technical aspects. The consequence of such a situation is often a lack of integration of the communication dialogue with the local softwa
15、re dialogue. b) Commercial uspects Using hardware and software modules without standardized interfaces may mean buying software and hardware pieces designed to fit together well. The definition of a public universal interface for a specific communication application (such as facsimiile, Teletex, tel
16、ex, etc.) gives to the user more freedom in the choice of the products. Most of these difficulties regarding Softwares may be solved by the standardization of public inter- application interfaces. 1.2 “Programming Communication Interfaces*”. Interfaces allowing access to software providing a 1T-T co
17、mmunication service are called PCIs for Two levels of PCIs are defined: a) Application related interfaces which allow any local Application* (LA) to access any Communication Application* (CA). One example of an application related interface is the APPLUCOM, which is described in Recommendation T.611
18、. NetworkProtocol related interfaces, which allow any LA or Communication Management Entity* (CME) to access any Lower Layer Module* (LLM). Nehvork/protocol related interfaces are under study. b) NOTE -The definition of new terms indicated with (*) may be found in Annex A. Examples are shhown in App
19、endix I. 1.3 technical Recommendations. The information to be exchanged through the interfaces and the way to exchange them is subject to the PCIs ?he exchange method describes the procedures that are performed to convey the information between SOfhVaE modules on each side of the interfaces. Recomme
20、ndation F.581 (03/93) 1 ITU-T RECMN*F.SBL 93 W 48b259l1 0582208 b20 2 Scope 2.1 General 2.1.1 The applicability of PCIs requires the definition of: This Recommendation gives guidelines from a service point of view for the definition of PCIs. a) the information to be exchanged through the interface.
21、These messages are defined Operating System and programming language independent, but ITU-T service definition dependent. Therefore, they are defined in technical ITU-T Recommendations; the way to convey (Exchange method) this information through the interface. b) 2.1.2 The main objective of this Re
22、commendation is to define: - - - - the possible benefits of these PCIs; a common vocabulary for all PCIs definitions; a general functional model allowing all PCIs to work together if required; general rules to be taken into account in the definition of PCIs. 2.1.3 Technical definitions of PCIs are d
23、efined in related Recommendation(s): T.611: Programming Communication Interface (PCI) APPLICOM for Facsimile Group 3, Facsimile Group 4, Teletex and telex services. NOTE - Other Recommendations are under study. 2.2 Applicability The provision of Programming Communication Interfaces is not mandatory
24、for participating in a IT-T service. The intention is to help developers by giving them general guidelines for the integmtion of -T services in their products. It must be kept in mind that PCIs leave a certain freedom to manufacturers, who may implement one or more of the possible PCIs and may exten
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