B—ISDN和ATM与宽带通信业务

本文首先通过对宽带业务发展情况，ＡＴＭ标准，ＡＴＭ适配层的分析引出了ＡＴＭ对Ｂ－ＩＳＤＮ发展的作用及向Ｂ－ＩＳＤＮ过渡的步骤，并指出工发具ＳＭＤＳ和ＦＲ业务接口的ＡＴＭ交换机，对实现Ｎ－ＩＳＤＮ向Ｂ－ＩＳＤＮ过渡具有积极现实意义，其次介绍和分析了ＩＴＵ－Ｔ，日本ＮＴＴ及欧洲各国关于ＡＴＭ和Ｂ－ＩＳＤＮ的标准化活动，应用试验等情况。     

N—ISDN走出低谷B—ISDN迈向市场

本文介绍了全球Ｎ－ＩＳＤＮ的商用情况和Ｂ－ＩＳＤＮ的发展趋势，展示出Ｎ－ＩＳＤＮ走了低谷、Ｂ－ＩＳＤＮ迈向市场的美好前景。     

B—ISDN与64kb／sISDN的互通

随着Ｂ－ＩＳＤＮ深入研究的开展，宽带网络试验性工作的标准化程度不断提高。但Ｂ－ＩＳＤＮ的发展是与６４ｋｂ／ｓＩＳＤＮ长期共存的，所以研究Ｂ－ＩＳＤＮ与６４ｋｂ／ｓＩＳＤＮ的互通是非常必要的。本文将介绍这两种网络的互通通信流程、业务及连接类型；讨论Ｂ－ＩＳＤＮ与６４ｋｂ／ｓＩＳＤＮ互通功能的要求；最后给出互通示例。     

B－ISDN与64kb／sISDN的互通

随着Ｂ－ＩＳＤＮ深入研究的开展，宽带网络试验性工作的标准化程度不断提高。但Ｂ－ＩＳＤＮ的发展是与６４ｋｂ／ｓＩＳＤＮ长期共存的，所以研究Ｂ－ＩＳＤＮ与６４ｋｂ／ｓＩＳＤＮ的互通是非常必要的。本文将介绍这两种网络的互通通信流程、业务及连接类型；讨论Ｂ－ＩＳＤＮ与６４ｋｂ／ｓＩＳＤＮ互通功能的要求；最后给出互通示例。     

向宽带综合业务数字网进军

本文介绍了通信发展的状况和Ｂ－ＩＳＤＮ的特性，重点提出了现有局域网Ｎ－ＩＳＤＮ网络与Ｂ－ＩＳＤＮ网络互连的策略，以及面向２１世纪宽带通信网的网络结构。最后简述了通信业务物发展趋势及利用ＡＴＭ／Ｂ－ＩＳＤＮ技术改造中国现有通信网的设想。     

关于四川省发展B—ISDN的初步设想

介绍四川电信网的发展趋势，对Ｂ－ＩＳＤＮ的概念、关键技术等作简要概括后，根据发达国家Ｂ－ＩＳＤＮ业务发展情况，提出我省发展Ｂ－ＩＳＤＮ的初步设想和几点建议。     

向B－ISDN方向发展

介绍了宽带综合业务数字网（Ｂ—ＩＳＤＮ）国内外的发展状况；Ｂ－ＩＳＤＮ所提供的业务及用户；实现Ｂ－ＩＳＤＮ的技术标准和发展我国Ｂ—ＩＳＤＮ的建议。     

B－ISDN与N－ISDN的区别

Ｂ－ＩＳＤＮ与Ｎ－ＩＳＤＮ的区别Ｂ－ＩＳＤＮ与Ｎ－ＩＳＤＮ相比，主要有以下３点不同，这也是Ｂ－ＩＳＤＮ的优势：（ｌ）以光纤为传输媒介。Ｎ－ＩＳＤＮ是建立在原有电话网、分组网基础上的，它可利用现有网络终端、用户环路等网络资源。而８－１犯Ｎ则必须以光纤作...     

向B—ISD方向发展

介绍了宽带综合业务数字网国内外的发展状况；Ｂ－ＩＳＤＮ所提供的业务及用户；实现Ｂ－ＩＳＤＮ的技术标准和发展我国Ｂ－ＩＳＤＮ的建议。     

亚太地区的B—ISDN建设及其思考

本文较详尽地介绍了亚太各国对Ｂ－ＩＳＤＮ的研究和实验情况，并对我国发展Ｂ－ＩＳＤＮ提出相关建议。亚太许多国家和地区都把Ｂ－ＩＳＤＮ试验纳入当地信息基础设施的发展计划中，其试验分阶段进行，实现技术各有侧重。     

Frame relaying as a common access to N-ISDN and B-ISDN dataservices

Widespread use of personal computers (PCs) and PC networks is leading to a strongly increased demand for WAN data services in terms of number of accesses and required bandwidth. Narrowband ISDN (N-ISDN) and broadband ISDN (B-ISDN) have the potential to satisfy, respectively, the existing and developing requirements. However, a flexible evolution path needs to be identified for the provision of ISDN access facilities. Frame relaying and frame switching are prime candidates for such a common access facility, although not necessarily intrinsic B-ISDN data services. The article gives an overview of frame relaying and frame switching as possible candidates for harmonized access to N-ISDN and B-ISDN. Pre-ISDN, N-ISDN, and B-ISDN services with their characteristics in terms of cost and performance are first described. It is shown how frame relaying and switching are positioned with respect to the identified service requirements. Then some examples are given of selected scenarios, and the role played by specifically frame relaying to provide access to B-ISDN services, offering at the same time a seamless evolutionary path from N-ISDN to B-ISDN. The position of frame relaying and switching is discussed first in respect to application requirements, and then in architectural terms. Frame relay (and frame switching) services are then identified as services that provide the necessary low threshold and short lead time for rapid market penetration, in order to allow applications to indirectly take advantage of the benefits of ATM services     

关于我国ISDN发展战略

本文简要地分析了国外ＩＳＤＮ市场走势，简述了国内外对ＩＳＤＮ的开发及应用情况，介绍了Ｂ－ＩＳＤＮ的基本特点与业务内容，指出了实现Ｂ－ＩＳＤＮ的关键技术，最后就我国如何开发ＩＳＤＮ提出了建议。     

B-ISDN architecture and protocol

The authors discuss the architecture and protocol for broadband ISDN (B-ISDN) based on the CCITT standards. The discussion attempts to address the general concept of B-ISDN architecture and protocol and, whenever possible, present alternatives and the rationale for decisions in the selection of the protocol. B-ISDN is presented as a network evolution, and the impact of the asynchronous transfer mode (ATM) on the network is described. The role of virtual channel and virtual path in B-ISDN is discussed. The B-ISDN protocol structure and lower layer functions comprising the physical, ATM, and adaptation layers are presented, and the tentative trends of signaling and traffic control for the B-ISDN are delineated     

Narrowband ISDN and broadband ISDN service and network interworking

For a significant period of time, B-ISDN will coexist with the 64-kb/s-based (narrowband) ISDN. The specification of a concept and the mapping functions employed for interworking between the two networks, in particular for voice services, is a major factor for the success of B-ISDN     

宽带ISDN与ATM交换技术──第一讲 ATM的基本概念和B－ISDN标准

本文讨论了宽带ＩＳＤＮ的产生和发展，介绍了ＡＴＭ的基本概念和原理，并给出了ＩＴＵ－Ｔ关于Ｂ－ＩＳＤＮ／ＡＴＭ的有关标准。     

现代通信网络的发展方向──宽带综合业务数字网

文章介绍了ＩＳＤＮ的标准和网络结构，以及信息高速公路的概念和基本技术。说明了Ｂ—ＩＳＤＮ与信息高速公路之间的关系，指出信息高速公路是Ｂ—ＩＳＤＮ的基础，是世界通信发展的方向。     

Technology Aspects for System 12 Broadband ISDN

Although the enhancement of System 12, SEL's digital switching system, for ISDN services is virtually complete, further development work is being carried out to allow broadband switching for videophone services, videoconferencing, and the distribution of radio and television programs. This paper describes an appropriate approach to the evolution Of System 12 toward the broadband ISDN (B-ISDN), emphasizing the crosspoint and technology aspects of the broadband switch. Test results on a broadband switch VLSI circuit for 140 Mbit/s in a 2μm CMOS technology are presented.     

Broadband ISDN Switching Capabilities from a Services Perspective

Broadband switching and transmission technologies are maturing rapidly, promising to make broadband ISDN (B-ISDN) possible and potentially economical in the near future. The diversity of possible B-ISDN services provides much impetus for the implementation of B-ISDN, but complicates the task of specifying network switching requirements. This paper examines a few representative services in order to generate a set of basis vectors in capability space. New services are then projected onto this basis; if a new service cannot be constructed from the basis vectors, other vectors are added to the basis set. B-ISDN architects can then specify switching requirements by selecting those capability basis vectors that are required for the services most in demand. For full motion entertainment video services, circuit switching capability at about 150 Mbit/s may be required, while selective broadcast and remote switching capabilities may reduce the cost of these services. For subvideo-rate services, new transfer mode (NTM) capability may be required to allow users the flexibility to allocate access channels dynamically on a per-call basis. Multiple connection (e.g., voice and video) and multiple party call capabilities may be required for many B-ISDN services, implying a need to extend the ISDN signaling protocol. The capability for the user to request network code conversion between different coding formats (e.g., NTSC or HDTV), and network compression of signals to reduce the cost of interoffice facilities, may also be required. Finally, fast call setup capability and high calling volume capabilities may be required, implying a need to distribute call processing functions over multiple processors in the central office.     

Introduction strategies towards B-ISDN for business and residentialsubscribers based on ATM

It is argued that introduction strategies for B-ISDN with a clear evolutionary path to the future must be worked out. Two strategies are described, along with their early application. The first is mainly intended for business customers and offers an initial-phase asynchronous transfer mode (ATM) cross-connect functionality. The second is for residential users and initially offers POTS (plain old telephone service) and narrowband ISDN and analog TV services. Both solutions can easily be upgraded step by step to a full ATM-based B-ISDN