通信网络向宽带的ISDN的过渡分析

本文首先分析了国内和国际通信网向Ｂ－ＩＳＤＮ过渡的发展状况，针对我国在数据通信网发展中的实际情况、从网络接入的速率瓶颈入手，结合我国主要采用的数据通信技术，分析我国通信网向Ｂ－ＩＳＤＮ过渡的路线，我们给出了向Ｂ－ＩＳＤＮ过渡的可能的路径的分析。     

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。     

C3本地B—ISDN规划方案的探讨

结合达川地区实际情况，对Ｃ３本地Ｂ－ＩＳＤＮ网规划方案的原则，现有通信网向Ｂ－ＩＳＤＮ网过渡的方法，步骤及相关问题进行了探讨。     

ISDN的现状和发展

９０年代将是ＩＳＤＮ和宽带ＩＳＤＮ迅速发展的年代，本文介绍了国外Ｎ－ＩＳＤＮ和Ｂ－ＩＳＤＮ的发展动向，并结合我国通信网的现状，对发展ＩＳＤＮ（Ｂ－ＩＳＤＮ）提出若干建议。     

从现有通信网向B－ISDN过渡的第一步──帧中继

文章分析和介绍了帧中继保持了分组交换网价格低和网络灵活的优点，它简化了现有分组技术，有效地解决了容量和速率的问题，能支持现有的公用分组网；将来通信网向Ｂ－ＩＳＤＮ过渡，采用ＡＴＭ技术，它仍可对用户进网业务提供服务；而且帧中继容易实现，所以是向Ｂ－ＩＳＤＮ过渡第一步的平稳而可行的技术。但由于其速率仍受到限制，不能支持话音和图象，所以不能直接过渡到Ｂ－ＩＳＤＮ。     

城域网与B－ISDN

本文首先阐述了应用需求是如何促进宽带高速网络发展的，然后在说明现有通信网技术的缺点和比较两种过渡技术的基础上，指出利用城域网过渡到Ｂ－ＩＳＤＮ的优点，最后提出现有通信网通过城域网技术逐步演变成Ｂ－ＩＳＤＮ的基本设想。     

从现有通信网向B—ISDN过渡的第一步——帧中继

文章分析和介绍了帧中继保持了分组交换网价格低和网络灵活的优点，它简化了现有分组技术，有效地解决了容量和速率的问题，能支持现有的公用分组网；将来通信网向Ｂ－ＩＳＤＮ过渡，采用ＡＴＭ技术，它仍可对用户进网业务提供服务；而且帧中继容易实现，所以是向Ｂ－ＩＳＤＮ过渡莓一步的平稳而可行的技术。但由于其速率仍受到限制，不能支持话音和图象，所以不能直接过渡到Ｂ－ＩＳＤＮ。     

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。     

城域网与B—ISDN

本文首先阐述了应用需求是如何促进宽带调整网络发展的，然后在说明现有通信网技术的缺点和比较两种过渡技术的基础上，指出利用城域网过渡到Ｂ－ＩＳＤＮ的优点，最后提出现有通信网通过城域网技术逐步演变成Ｂ－ＩＳＤＮ的基本设想。     

ATM技术──B－ISDN的基础

ＡＴＭ技术──Ｂ－ＩＳＤＮ的基础谭淑贞编者按目前的通信网正逐步向宽带化、综合化和智能化方向发展。Ｂ－ＩＳＤＮ（宽带综合业务数字网）是未来通信网的发展方向，而ＡＴＭ（异步转移模式）是实现Ｂ－ＩＳＤＮ的基础。为了使广大读者对ＡＴＭ技术有一个基本的了解，本...     

B-ISDN: a technological discontinuity

The transition to B-ISDN from current networks represents a major technological discontinuity for the communications world. These discontinuities must be considered for the successful evolution of existing networks to broadband networks. The authors provide an overview of B-ISDN data transfer protocols and the services it will support. They discuss the effects of B-ISDN switching, network operations and management, signalling protocols and architectures, and networked computing     

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的发展趋势及利用 ATM/B-ISDN技术改造中国现有通信网的设想。     

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。     

MAN向B—ISDN过渡方法的研究

本文比较了利用窄带ＩＳＤＮ和帧中继技术与利用城域网（ＭｅｔｒｏｐｏｌｉｔａｎＡｒｅａＮｅｔｗｏｒｋ－ＭＡＮ）来实现过渡的两种方案，指出利用ＭＡＮ过渡到Ｂ－ＩＳＤＮ具有更多的优越性，ＭＡＮ是为适应局域网（ＬＡＮ）互连和高速数据通信而发展起来的，网距离通常可达３０～５０ｋｍ，由于它的信元格式和传输方式上与Ｂ－ＩＳＤＮ的兼容性，使得它成为从现有网络向Ｂ－ＩＳＤＮ过渡的最佳中介域网技术。     

Connection architecture and protocols to support efficient handoffs over an ATM/B-ISDN personal communications network

The next generation personal communication network will likely internetwork wireless networks via the ATM/B-ISDN to enable ubiquitous broadband personal communication services. Support of user terminal mobility, particularly the capability for fast and seamless handoffs, over the ATM/B-ISDN is an expected requirement that is not currently met. We propose extensions to the ATM/B-ISDN user transport and signaling network architectures and signaling protocols to meet these requirements. The new architecture employs the Mobile Virtual Circuit (MVC), a dynamic connection tree in which routes are predetermined but not set up for potential handoff connections. During a handoff, associated signaling using source-routing with a new robust adaptation feature is employed for fast resource allocation to establish the handoff connection by distributed control. We also address the new problem of packet ordering synchronization to enable a seamless handoff. The connection tree reconfigures after each handoff to enable continuous support of successive handoffs. The proposed scheme optimizes handoff delay over the ATM/B-ISDN while minimizing unnecessary resource allocation, chances of handoff failure, and call processing load in the intelligent network, and the extensions are backward compatible to current ATM/B-ISDN standards and implementations.This paper was presented in part in PIMRC'95 in Toronto, and Globecom'95 in Singapore. This work was supported by the Canadian Institute of Telecommunications Research (CITR), funded under the Canadian Federal Government's Networks of Centres of Excellence Program.     

Integrated open service node for active networks and services

The changing business scenario for telecommunication services requires higher levels of openness compared to current technologies. The realization of a programmable and open network intelligence fosters the transition toward an open telecom market. This extended openness is requested to allow flexible component-based service integration; extended control/management capabilities are needed for new electronic business infrastructure, more service personalization and programmability, and integration and management of heterogeneous networks (Internet/B-ISDN/mobile, etc.). We present an integrated architecture for active and programmable networks and services based on the concept of an integrated service node. We study the business point of view, the B-ISDN/ATM point of view, and the Internet point of view. Each of these technologies is supported by an adapted and adaptive service node to introduce advanced service composition, control, and management capabilities. We present a possible implementation infrastructure, and discuss related issues     

B—ISDN网上的宽带多媒体通信

本文论述了宽带多媒体通信的特点及对传输网络的要求，对基于ＡＴＭ的Ｂ－ＩＳＤＮ网的多媒体通信系统进行了研究和探讨。     

Evolving from narrowband [ISDN]

A nodal system architecture developed by Nippon Telegraph and Telephone (NTT) that will allow stepwise evolution to broadband integrated services digital network (B-ISDN), starting from the current nationwide narrowband integrated services digital network (N-ISDN) system in Japan, is discussed. The status of the current N-ISDN and the requirements for B-ISDN as the next step after N-ISDN are discussed, followed by a scenario for the evolution of B-ISDN from N-ISDN. A plan is outlined for the first ATM switching service for high-speed data transfer and a nodal system architecture permitting easy evolution to full B-ISDN