综合业务数字网

作者简介

《ISDN综合业务数字网》内容简介：Much has happened in the evolution of ISDN since this book, and the subsequent editions, were published. Not only have "narrowband" ISDN standards, products, and services evolved and matured, but applications have grown. ISDN is finally beginning to realize its promise Of even more significance perhaps, is the emergence of Broadband ISDN （B- ISDN） technologies and services B-ISDN received passing mention in the first edition of this book and at least one dedicated chapter plus promi- nent mention in other chapters in the second edition; this treatment was pretty much consistent with what details of B-ISDN were known at the time of the writing In this edition, B-ISDN occupies a significant portion of the book.

书籍目录

PrefacePreface to the First EditionChapter 1 Telecommunications Background for ISDNChapter 2 ISDN Terms,Definitions ,and StandardsChapter 3 Overvew of ISDN ServicesChapter 4 ISDN Protocol ArchitectureChapter 5 Physical Layer ProtocolsChapter 6 The D-Channel Data Link ProtocolChapter 7 The D-Channel Layer 3 ProtocolChapter 8 Packet-and Frame-Mode Bearer ServicesChapter 9 National ISDNChapter 10 Singnaling System No.7Chapter 11 ISDN ApplicationsChapter 12 ISDN ImplementationsChapter 13 ISDN ProductsChapter 14 Introduction to Broadband and Fast Packet ServecesChapter 15 Frame Relay Concepts and ProtocolsChapter 16 Frame Relay Call Control SingnalingChapter 17 Frame Relay Applications,Products,and ServicesChapter 18 ATM Concepts and ProtocolsChapter 19 ATM Siganling across the UNIChapter 20 ATM Applications,Products ,and ServicesChapter 21 Switched Multimegabit Data ServiceChapter 22 ISDN,B-ISDN,and the InteretChapter 23 Digital Subscriber Line TechnologiesAppendixIndex

前言

　　Much has happened in the evolution of ISDN since this book, and the subsequent editions, were published. Not only have "narrowband" ISDN standards, products, and services evolved and matured, but applications have grown. ISDN is finally beginning to realize its promise Of even more significance perhaps, is the emergence of Broadband ISDN （B- ISDN） technologies and services B-ISDN received passing mention in the first edition of this book and at least one dedicated chapter plus promi- nent mention in other chapters in the second edition; this treatment was pretty much consistent with what details of B-ISDN were known at the time of the writing In this edition, B-ISDN occupies a significant portion of the book.　　Anothez; perhaps related, evolutionary step is that it has become hard- er to maintain expertise in all facets of ISDN. For that reason, the first author was joined by a second for the third edition. We two have been colleagues for many years, and hope that our complementary approach improves the book's usefulness to its readers　　The same issues that motivated meccx to write the first edition prompted the second and the third. ISDN is an important technology and an important evolution for the telecommunications industry. It is also timely and rapidly moving. This fourth, signature edition adds more up-to-date information about ISDN products and services, and offers a new focus on B-ISDN services, the Internet.

章节摘录

　　Picture a single telecommunications network that would break down the walls of dassrooms, letting teachers, students, and staff directly access computer-based resources, as well as other communications facilities This network enhances communications between teachers and staff allowing students to gain more of their teachers' time for instruction, personal attention, and an enriched curriculum. Computer-aided instruction and computer-based teaching and grading are enhanced, allowing better tai- lor-made courses and tracking of individual student's progress Telecon- ferencing provides courses to the sick or homebound student or provides courses to students spread over a wide geographic area, as well as contin- uing education for teachers and other staff members. Community- or statewide databases allow the sharing of scarce educational resources Stu- dent attendance and teacher availability are tracked via centralized data- bases. Personal computer （PC）-to-PC networking is easily accomplished between buildings on a single campus or between secondary school and university campuse.　　……

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