局域网接入ATM网技术（二）

局域网接入ＡＴＭ网是信界最热门的技术之一。如何既享受ＡＴＭ的高带宽，又保留局域网现有的协议层次，从而保护用户投资，是一个很吸引人的技术问题ＩＰ Ｏｖｅｒ ＡＴＭ（ＩＰＯＡ），局域网仿真（ＬＡＮ Ｅｍｕｌａｔｉｏｎ）以及Ｍｕｌｔｉ－Ｐｒｏｔｏｃｏｌ Ｏｖｅｒ ＡＴＭ（ＭＰＯＡ）是局域网接入ＡＴＭ的三种最流行的技术规范。其中，局域网仿真和ＭＰＯＡ适用范围广，可以接入各种网络层协议。这里对局域网仿真和Ｍ     

局域网接入ATM网技术（三）

局域网接入ＡＴＭ网是通信界最热门的技术之一。如何既享受ＡＴＭ的高带宽，又保留局域网现有的协议层次，从而保护用户投资，是一个很吸引人的技术问题，ＩＰＯＶｅｒＡＴＭ（ＩＰＯＡ）、局域网仿真以及Ｍｏｕｌｔｉ－ＰｒｏｔｏｃｌｏＯｖｅｒＡＴＭ（ＭＰＯＡ）是局域网接入ＡＴＭ的三种最流行的技术规范。其中，局域网仿真和ＭＰＯＡ适用范围广，可以接入各种网络层协议。这里对局域网仿真和ＭＰＯＡ这两种技术的原理、通信规程     

ATM与Internet互连技术

ＡＴＭ网络与Ｉｎｔｅｒｅｔ互连是现代通信发展的必然结果。文章从通信协议和技术规范方面对ＡＴＭ、Ｉｎｔｅｒｎｅｔ相互连接的原理、方法、结构等进行了描述，着重介绍了ＩＰＯＡ、ＬＡＮＥ、ＭＰＯＡ技术及实现。     

ATM与Internet互连技术

ＡＴＭ网络与Ｉｎｔｅｒｎｅｔ互连是现代通信发展的必要结果。本文从通信协议和技术和规范方面对ＡＴＭ,Ｉｎｔｅｒｎｅｔ相互连 原理,方法结构等进行了描述,着重介绍了ＩＰＯＡ,ＬＡＮＥ,ＭＰＯＡ技术及实现。     

一种MPOA边缘设备的研制

ＡＴＭ Ｆｏｒｕｍ提出的局域网仿真（ＬＡＮＥ）技术是一种将传统局域网接入到ＡＴＭ网络的重要方法,以ＬＡＮＥ为基础的ＭＰＯＡ将使ＡＴＭ真正进入企业网,本文提出一种ＭＰＯＡ边缘设备的方案,已经实现了局域网仿真网桥的功能,并且达到了很高的性能。     

在ATM网上运行IP的多种方案

文章对在ＩＰ与ＡＴＭ结合的多种方案，即经典的ＩＰｏｖｅｒＡＴＭ、ＭＡＲＳ、局域网仿真、ＮＨＲＰ、ＭＰＯＡ及第三层交换进行了描述，并同时指出其中值得注意的一些问题。     

基于面向对象方法实现的MPOA1.0协议软件

介绍基于Ｍｏｔｏｒｏｌａ ＰｏｗｅｒＰＣ芯片ＭＰＣ８６０Ｓａｒ的应用开发板,ＡＴＭ接口卡及实时多任务操作系统ｐＳＯＳ＋,以ＡＴＭ论坛ＭＰＯＡ１．０协议标准为基础,采用面向对象的系统设计方法,开发出ＭＰＯＡ１．０协议软件。其低层的局域网仿真层由同期开发的ＬＡＮＥ２．０软件实现。     

ATM网络的MPOA技术原理

本文论述了ＡＴＭ网络的最新通信协议ＭＰＯＡ的基本组成部分及其特点，并对他们的基本功能原理作了分析描述。     

MPOA在ATM网络中的应用

本文通过对ＭＰＯＡ优势的讨论,提出了一些建立ＡＴＭ网络时应考虑的问题,应用ＭＰＯＡ和捷径解决诸如网络安全性,虚拟网络,用户的动态配置等传统问题,特别是解决传统路由器瓶颈。     

ATM PON中MAC算法的研究

ＡＴＭ ＰＯＮ网络属于分布式媒质共享拓扑结构，所承载业务的 ＱｏＳ要求各异，如何在保证系统传输效率的同时满足用户对服务质量的需求，是ＡＰＯＮ ＭＡＣ算法的关键。分析了 ＡＰＯＮ系统的特点，提出了分布式分层调度的方案。     

发展中的IP、ATM融合技术

简要分析了IP、ATM自身的特点以及其相互融合发展的原因,概要介绍了IP、ATM融合技术,重点分析了MPOA、MPLS的技术要点。并系统阐述了MPLS技术在因特网、电信网的融合上具有的独特优势,论证了MPLS将在未来网络演进、融合中发挥重要的作用。     

基于ATM的多协议MPOA简介

首先对目前应用比较广的两种方法，局域网仿真和传统ＩＰ－ｏｖｅｒ－ＡＴＭ在局域网互加的优缺点进行了分析和比较，接着，详细介绍了ＭＰＯＡ体系结构的单元和其关键部分－虚拟路由器的概念。最后，分析了ＭＰＯＡ在网络互连中的优势。     

话音ATM交换的实现─—ATM论坛电路仿真系列建议

近年来，随着ATM主干网络的建设和发展，研究ATM对现有通信业务的支持方式和适配技术是目前ATM技术研究的热点之一。话音ATM交换在降低话音通信成本和简化网络操作环境等方面提供了大量的技术手段，并且支持在单一网络环境中的多种综合业务传输。ATM论坛制定了电路仿真系列建议，话音ATM交换的技术已经基本成熟。文章通过对话音ATM交换在实现和优化方面的技术进行分析，并提出一种基于NativeModeATM的话音通信方式。     

Applications of ATM in global networks

This article describes the market drivers, objectives, and consequences of introducing ATM into public and private networks. To serve the diverse needs of environments and applications, ATM presents a broad choice of characteristics to users and providers. To harness this diversity and bring structure to the choices, this article discusses ATM transfer capabilities (ATCs) and quality of service (QoS) classes as specified in ITU-T Study Group 13. Industry aims to achieve consistency between the ITU-T and ATM Forum specifications. This article includes consideration of AALs and interworking in developing network strategies. Providers will offer a selection of the possible services defined for ATM. Also, each provider will communicate their strategy for preferred network utilization and efficient traffic through incentives to users     

ATM Forum signalling protocols and their interworking

The ATM Forum is a key body which has been developing specifications for asynchronous transfer mode (ATM) technology over the past six years. It has produced a number of signalling specifications covering the user network interface, the inter-carrier interface and private networking environments. While work continues on 'fine-tuning' these agreements, there is still discussion about how they are used in large scale networks, and in particular on the interworking of public and private network environments.This paper reviews the current status of the relevant protocols and their scope. It then explores the issues related to their interworking and discusses the role of the proposed ATM internetwork interface (AINI) as an alternative internetwork or inter-carrier interface to its broadband intercarrier interface (B-ICI).     

PCS mobility support over fixed ATM networks

As broadband multimedia services and wireless services become popular, there is growing interest in the industry to support ATM over a wireless link, and wireless access to fixed ATM networks. We focus on the internetworking of PCS and ATM networks, in which the air interface remains one of the PCS standards and the backbone is an ATM network with mobility support. It is desirable to minimize the impact of the internetworking and mobility support on the existing/emerging PCS and ATM specifications. A network architecture, a protocol reference model, and signaling protocols for PCS mobility support over fixed ATM networks are described. They are compared against other implementation alternatives and the trade-offs are discussed. Some performance results of the proposed architecture are also presented     

Broadband ISDN and asynchronous transfer mode (ATM)

The transfer mode chosen by the CCITT Study Group XVIII Task Group on ISDN Broadband Aspects as the basis of broadband ISDN is called the asynchronous transfer mode (ATM). ATM is a high-bandwidth, low-delay, packetlike switching and multiplexing technique. It is essentially a connection-oriented technique, although it is envisioned as a basis for supporting all services, connectionless as well as connection-oriented. The basic transfer mode concepts are explained. The limits of synchronous transfer mode (ATM) are discussed and reasons for choosing ATM over STM are given. The main technical issues having an impact on the ATM specifications are discussed     

Signaling stack design for wireless ATM access networks

One of the challenges in designing a wireless ATM network is to specify control functions capable of managing data and signaling connections of moving mobile terminals. The challenge is tough, due to the facts that such control functions neither exist in the current state-of-the-art wireless networks nor are included in the existing ATM specifications and implementations. This article describes the design principles of a wireless ATM signaling stack created in the WAND project. The article identifies some common problems and presents possible solutions to the problems. To justify the feasibility of the ideas presented, some details of a reference implementation, the Wireless ATM Network Demonstrator (WAND) signaling stack, are revealed     

ATM adaptation layer protocol

The ATM adaptation layer (AAL), as defined in the International Telecommunications Union (ITU) 1990 recommendations, will enhance the services provided by the ATM layer to support the functions required by the next higher layer. The question of what that next higher layer is has been a matter of controversy from the beginning of the AAL study. AAL protocol specifications are key to the success of B-ISDN services. They must be developed in a timely fashion, in cooperation with other standardization bodies such as ISO and the ATM Forum