Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.cplire.ru/rus/casr/os/3_12/1/1.htm
Дата изменения: Mon Mar 21 07:08:38 2016 Дата индексирования: Sun Apr 10 14:02:43 2016 Кодировка: Windows-1251 Поисковые слова: images |
Open System Handbook: A Guide to Building Open Systems
Digital
Published by Digital Equipment Corporation, USA
1991
This book is designed to provide interested individuals and organizations with an overview of open systems and the work being done to achieve them. Its focus is on the information and processes that open systems architects and planners may use to make strategic decisions about open systems in their organizations.
An open systems environment potentially provides benefits for users, software developers, and system suppliers in ways specific to each group's interests. For users, part of the promise of open systems is in investment protection provided by the ability to adapt and evolve systems and solutions as needs and technologies change. Open systems also promise significant savings and a competitive advantage for companies that can apply them effectively.
In order to realize the promise of open systems, those responsible for an organization's information technology systems must understand the underlying concept of open systems and apply it to their business in an appropriate way. In addition, technology planners and implementors need to recognize that there is no single answer that will deliver the benefits of open systems to all users in all situations. Nor are off-the-shelf solutions available for all open systems needs. To successfully apply open systems technology as a competitive advantage, companies must be knowledgeable about what open systems can or cannot do for any particular business situation.
The focus on open systems today is concentrated not only on operating systems, but also on standardizing interfaces to link existing systems, applications, and users. The interface approach concentrates on getting internationally accepted industry standards in place and on adding a variety of components to a common, modular operating environment. It is believed that the implementation of standards on each system within a network will provide a common and uniform structure that will reduce difficulties in bridging heterogeneous systems.
In addition, the interface standards approach to open systems gives the user an extra margin of safety because products that do implement specifications and standards are conformant and can be tested and verified as such. In the open systems arena, conformance is a real source of vendor independence for the user.
Ultimately, an open system, however it is defined, must meet the users' objectives. The central question that users must always ask themselves is:
"Does this product provide sufficient functionality for my open systems needs?" Following a well-designed, focused plan for developing a computing
environment is the best way to ensure that this question is answered properly. Defining such a plan requires identifying goals and priorities and carefully examining how each element of the environment matches those objectives.
Section I of this book presents conceptual and background information about open systems, the open systems arena, and ways in which companies and organizations can most effectively address open systems issues.
Section II of this handbook includes information on the current status of internationally accepted industry standards and specifications for open systems. This section is organized using a descriptive model of an open systems environment developed by the Central Computer and Telecommunications Agency (CCTA), the United Kingdom's procurement agency. The model, based on the acronym MUSIC, includes elements for management (M), user interface (U), system services (S), information and data (I), and communications(C). In addition. Chapter 11 deals with several issues that transcend these categories including security, internationalization, and software development environments.
Appendices include an overview guide to standards developing organizations and consortia, a listing of standards development organizations, and a summary of open systems environments developed by prominent standards and open systems organizations.
CONTENTS
Section I Open Systems Explored
Chapter 1 Introduction
Chapter 2 Open Systems: Concept and Reality
The Evolution of Open Systems 2-1
Definition of an Open System 2-4
Perceptions of "Open" 2-5
Standard Platforms 2-6
Networking 2-6
Availability and Accessibility 2-7
Relating Definitions of Open Systems 2-8
Open Systems Potential 2-9
Standards for Open Systems 2-10
Chapter 3 The Open Systems Environment
Organizing the Discussion 3-1
Elements and Components of MUSIC 3-2
Other Services 3-4
Aligning Products and Standards with the MUSIC Model 3-5
Chapter 4 Application Environment Profiles
Profile Development Within Standards Organizations 4-5
Chapter 5 Applying Open Systems Information to Your Business
Steps to Implement an Open Systems Environment
5-1
Step 1: Know your business objectives 5-1
Step 2: Identify application requirements 5-2
Step 3: Prepare a profile that identifies the suite of
capabilities needed to support your application 5-2
Step 4: Acquire or engineer software that matches your
profile 5-2
Step 5: Verify the open systems characteristics of the
application 5-3
Step 6: Verify that business objectives are met 5-3
Step 7: Repeat the sequence 5-4
Human Factors 5-4
Using Standards in Describing Applications 5-4
Profile Development 5-5
Levels of Conformance 5-7
Managing Software Development 5-9
Conformance Testing of Applications 5-9
Using Standards in Buying Systems 5-10
Section II Elements of an Open System
Chapter 6 The Management Element
The Management Element 6-1
Description of Current Standards Work 6-1
History and Current Status 6-2
ISO/IEC Management Standards Activities 6-2
TCP/IP Management Activities 6-4
RFC 1157 Simple Network Management
Protocol (SNMP) 6-4
Coexistence of TCP/IP and OSI 6-5
IEEE POSIX 1003.7 System
Administration 6-5
Open Software Foundation's Distributed Management
Environment 6-6
User Interface 6-7
Management Applications 6-7
Common Management Services 6-7
Managed Objects 6-7
Chapter 7 The User Interface Element
POSIX 1003.2: The Shell and Utilities Working
Group 7-2
Description of POSIX 1003.2 standards 7-2
POSIX 1003.2a: User Portability
Extension 7-4
Form Interface Management System (FIMS) 7-4
Description 7-4
History and Status 7-5
X Window System 7-6
Description 7-6
History and Status 7-8
Graphical User Interfaces 7-8
OSF/Motif 7-8
Open Look 7-9
Chapter 8 The System Services Element
Languages 8-1
Portable Operating System Interface (POSIX) 8-4
Description 8-5
History and Current Status 8-8
POSIX-related International Work 8-9
Graphics 8-10
GKS 8-10
History and Current Status 8-10
GKS-3D 8-11
PHIGS 8-11
Description 8-11
History and Current Status 8-12
PEX 8-13
Chapter 9 The Information and Data Services Element
Data Definition and Access 9-1
Database Language Standards 9-1
The SQL Standard 9-2
Network Database Language 9-3
Remote Database Access 9-3
Description 9-4
History and Status 9-4
Data Repository and Management Systems 9-5
IRDS Description 9-5
History and Status 9-5
I ndexed Sequential Access Method (ISAM) 9-6
Document Data Interchange and Processing 9-7
The Office Document Architecture (ODA) and Office Document
Interchange Format (ODIF) 9-7
Description 9-7
History and Status 9-8
Standard Generalized Markup Language
(SGML) and Standard Document Interchange Format (SDIF) 9-9
Electronic Data Interchange (EDI)
9-10
Initial Graphics Exchange
Specification (IGES) 9-10
Electronic Design Interchange Format
(EDIF) 9-11
PDES/STEP 9-11
Description 9-11
History and Status 9-12
Chapter 10 The Communications Services Element
The Internet Protocol (TCP/IP) 10-1
Description 10-1
History and Status 10-3
Open Systems Interconnection (OSI) 10-5
OSI Base Standard Description 10-5
History and Current Status 10-6
Functional Standards: International
Standardi2ed Profiles 10-8
OSI-related Profile Work 10-9
Testing 10-11
Selected Established or Emerging Communications Standards 10-12
ISO/CCITT X.400, Mail and Message Interchange 10-12
ISO/CCITT X.500, Directory Services 10-12
File Transfer Access and Management (FTAM) 10-12
Remote Procedure Calls 10-13
ISO/CCITT X.25 (WAN standard) 10-13
Local Area Network (LAN) Standards 10-14
IEEE 802.3 Standard for Ethernet
Technology 10-14
Token Ring-IEEE 802.5 10.14
Fiber Distributed Data Interface
10-15
Chapter 11 Other Concerns
Security 11-1
Communications Security 11-2
Operating System Security 11-2
Internationalization 11-4
Software Development Environment 11-7
PCTE 11-7
A Tools Integration Standard (ATIS) 11-8
CASE Integration Services 11-8
Appendix A Overview Guide to Standards Developing Organizations and Consortia
Appendix B Standards Development Organizations
Appendix C Open Systems Environments
Appendix D Bibliography
Appendix E Glossary of Open Systems Environment/Standards-related Terms
Figures
2-1 Open Systems Potential 2-9
3-1 MUSIC Framework for Open Systems 3-2
3-2 The MUSIC Model 3-5
4-1 Open Systems Profile Components 4-2
4-2 The Role of Application Environment Profiles in Open Systems
Implementation 4-4
4-3 Organization Levels for Profile Development 4-8
5-1 Commercial Accounting Application 5-6
5-2 Engineering CAD/CAM Application 5-6
5-3 POSIX Conformance Levels for Applications 5-8
5-4 Added Value in Open Systems 5-10
6-1 Distributed Management Environment Model 6-6
7-1 POSIX 1003.2 Components 7-3
7-2 X Window System 7-7
10-1 OSI Reference Model 10-6
11-1 International Product Model 11-5
11-2 International Software Model 11-6
A-1 Standards Developing Organizations and Consortia A-1
A-2 European Regional Standards Structure A-2
C-1 Open Systems Environment Components C-1
C-2 IEEE TCOS Standards Work C-2
C-3 NIST Applications Portability Profile C-3
C-4 European Commission Guidelines for an Informatics Architecture
(1990) C-4
C-5 X/Open Common Applications Environment C-5
C-6 Open Software Foundation Applications Environment Specification (AES)
C-6
Tables
8-1 Internationally Standardized Languages
8-3
8-2 Language Bindings for Commonly Implemented ISO Standards
8-4
10-1 IAB Network-Specific Standard Protocols 10-4
10-2 ISO/IEC JTC1 Subcommittees and Working Groups with Particular Emphasis
on OSI and OSI-related Standards
10-7
10-2 ISO/IEC JTC1 Subcommittees and Working Groups with Particular Emphasis
on OSI and OSI-related Standards
(Continued) 10-8
11-1 TCSEC Operating-System Security Levels 11-3
ТЕКСТ:
находится в библиотеке Секции открытых
систем Совета РАН "Научные
телекоммуникации и
информационная инфраструктура"