ATM热方兴未艾

本文介绍了ＡＴＭ（不传输模式）的当前发展势态，描述了ＡＴＭ新一代网络技术的优点及特性，以及ＡＴＭ的标准制订、推广应用情况，并论述了ＡＴＭ近几年内仍将与传统型网络技术综合存在的态势；ＡＴＭ网络技术乃是当今的主流发展方向。     

ATM网络技术的应用研究

主要研究分析ＡＴＭ网络技术。讨论了ＡＴＭ网络的变换技术，控制技术，ＡＴＭ网络的多媒体业务，并介绍了ＡＴＭ多媒体网络应用情况。     

ATM上的IP交换技术

本文介绍了异步传输模式（ＡＴＭ）网络体系结构，重点叙述了其上的交换技术，并指出，ＡＴＭ中的ＩＰ交换技术将快速ＡＴＭ硬件直接与ＩＰ集成在一起，提高了信息的交换速度。这种解决方法综合了ＩＰ的简单性、伸缩性和健壮性，以及ＡＴＭ的速度快、容量高及多服务的通讯能力。     

Classical IP Over ATM规范（上）

ＡＴＭ（异步传输模式）技术是目前最受人瞩目的高速网络技术之一，如何使ＡＴＭ网络与现有的网络协议（如ＴＣＰ／ＩＰ）相结合是ＡＴＭ技术发展的关键性问题。本文通过对比分析了在ＡＴＭ局域网与传统局域网上ＩＰ协议实现的异同，并较为深入地介绍了在ＡＴＭ上运行ＴＣＰ／ＩＰ协议的技术方案。     

ATM交换机的硬件体系结构探讨

本文首先对ＡＴＭ的背景作了一个简单的介绍，接着阐述了ＡＴＭ和ＡＴＭ交换机的主要原理和技术，然后从硬件系结构的角度具体地分析了一种实验ＡＴＭ交换机是怎样ＡＴＭ技术的详细方法。     

ATM-PON及其关键技术

近年来，在接入网上使用ＡＴＭ技术以提供视频广播、远程教学以及数据通信等多种业务的趋势越来越明显。在无源光网络（无源的光接入网）上使用ＡＴＭ，不仅可以利用光纤的巨大带宽提供宽带服务，也可以利用ＡＴＭ进行高效的带宽业务管理。自１９９３年以来，许多国家都竞相开始研究ＡＴＭ－ＰＯＮ技术及其应用，并认为ＡＴＭ－ＰＯＮ是最有前途的、能以较低成本提供宽带接入的方案。     

ATM网络技术及其应用

本文介绍ＡＴＭ网络的参考模型、技术特点、交换技术和互联技术，并阐述了ＡＴＭ网络的应用前景。     

ATM技术及应用

ＡＴＭ技术由于具有速度快，频带宽，容量大等优点，已被ＣＣＩＴＴ选作ＢＩＳＤＮ的交换和复用技术，它是未来很有发展途径的通信技术，本文介绍了ＡＴＭ信元结构，信元的交换机制，ＡＴＭ网的连接服务及ＡＴＭ技术的应用。     

关于“ATM论坛”

异步传输模式（ＡＴＭ）是未来宽带网络的核心技术，作为ＡＴＭ技术标准制定组织之一的ＡＴＭ论坛，其作用也日益举足轻重。ＡＴＭ论坛成立于１９９１年１０月，是一个全球性的非盈利性的民间标准组织，其宗旨是促进ＡＴＭ技术在业界和终端用户通信领域的发展。自１９９１...     

无线ATM会胎死腹中吗?

ＷＡＴＭ（无线ＡＴＭ）涉及到９０年代两个热点问题的结合，即ＡＴＭ技术和移动通信技术的结合。一些工业观察家认为ＷＡＴＭ必须解决三个问题。首先面临的问题是ＡＴＭ协议中的特性与无线信道特性不一致的问题。ＡＴＭ要求传输的比特错误率非常低（大约为１０－１０），...     

利用ATM技术建设的民航通信网络

目前,民航空管系统的通信网络主要是由平面通信网和地空通信网这两个互相独立的网络组成。文章以民航ATM网为主干,讨论了民航空管系统通信网络建设的发展方向即民航平面通信网和地空通信网互连、互通的可能性以及在技术上所遇到的挑战。展望了语音、数据、视频3网合1在民航通信网中的发展前景。     

基于BP网的ATM带宽动态分配设计

阐述了利用神经网络预测由连续自动回归(AR)马尔可夫模型所代表的可变位速率通信流量(VBR);在这一理论的基础上,介绍一个BP神经网络模型,它是采用拆分组装方法来构造一个学习结果达到均方根误差全局最小点的BP神经网络,该方法能有效克服局部极小点,缩短学习时间和减小学习难度;该BP神经网络能精确地预测VBR通信流量,从而实现ATM带宽动态分配。     

基于BP网的ATM带宽动态分配设计

阐述了利用神经网络预测由连续自动回归（AR）马尔可夫模型所代表的可变位速率通信流量（VBR）；在这一理论的基础上，介绍一个BP神经网络模型，它是采用拆分组装方法来构造一个学习结果达到均方根误差全局最小点的BP神经网络，该方法能有效克服局部极小点，缩短学习时间和减小学习难度；该BP神经网络能精确地预测VBR通信流量，从而实现ATM带宽动态分配。     

ATM节点交换机51Mb/s线路终端接口电路的设计

在宽带综合业务数字网络（B－ISDN）中，ATM作为B－ISDN的核心技术，在通讯系统中占据了重要地位。本文主要介绍了ATM节点交换机51Mb/s线路终端接口电路的设计。     

Optimal locations of switches and interconnections for ATM LANs

Setting up an ATM LAN with such equipment as ATM switches and cables is known to be of high price. The setup cost can be minimized with optimal design while providing the required bandwidths for all demand pairs to maintain the quality of service (QoS) requirement. In this paper, we suggest a combined optimization problem for determining optimal locations of switches, interconnections, and their capacities which can be utilized in designing ATM LAN. Two integer programming (IP) formulations are provided for the optimal network design problem. Also, the well-known Lagrangean relaxation technique is applied to solve the IP formulations. With the algorithms, we can also obtain time-efficiency as well as upper and lower bounds of the optimal objective value. To validate our design approach, various test examples are shown. High-quality solutions for ATM LANs with average error range of about 2.2% are generated.Scope and purposeLocal area networks (LANs) have been widely used all around the world. Recently, the service demand of users is remarkably increasing while the hardware such as a switch with high performance is coming into the world. To accommodate the service demand while maintaining a quality-of-service (QoS) level, ATM technology has been suggested and studied for an improved future communications network. As an interim solution for the improvement, the idea that applies ATM technology to the existing LAN is proposed. The prices of network components such as ATM switches and links in an ATM LAN are known to be much higher than that of the conventional LAN systems. Focused on the characteristics of the high performance and future ATM technology, we study the cost-effective design of an ATM LAN.     

ATM communications network control by neural networks

A learning method that uses neural networks for service quality control in the asynchronous transfer mode (ATM) communications network is described. Because the precise characteristics of the source traffic are not known and the service quality requirements change over time, building an efficient network controller which can control the network traffic is a difficult task. The proposed ATM network controller uses backpropagation neural networks for learning the relations between the offered traffic and service quality. The neural network is adaptive and easy to implement. A training data selection method called the leaky pattern table method is proposed to learn precise relations. The performance of the proposed controller is evaluated by simulation of basic call admission models.     

混合的ATM技术研究

ATM协议体系结构分为物理层、ATM层、AAL层和高层,如果在终端用户处完全实现这些功能,不仅造价大,还要放弃用户在网卡、网络软件上的投资。而在终端用户的协议栈中采用混合的方案,则既能保留现有网络技术的一些协议层次,又加入ATM的协议层次,可以在将用户接入ATM网的同时,保护用户已有的网络投资。IPoverATM、ATM局域网仿真、DX1、CIF便是这种混合的ATM技术。该文对这些技术进行分析与比较,研究了它的具体实现方式。     

基于模糊控制的ATM网络VBR视频传输平滑策略

VBR视频传输的突发性是影响ATM网络服务质量的关键因素,文中通过模糊控制方法对视频传输流量的阈值进行监控,实现了接入的平滑并可动态调整传输速度。文中以传输流量及这发级作为评价指标进行分析,结果表明VBR视频传输自适应平滑策略的实效性。     

基于校园网组建的ATM技术应用研究

ATM技术全称为异步传输技术,在当今信息多样的网络社会中逐渐兴盛起来。ATM技术数据传输速度较高,能够同时传输多元化信息。对于校园网这种类型的局域网而言,通常要求所组建的局域网满足多样化用户的信息传输。由于校园内人数众多,数据传输量大,因而需要有高速传输的网络。ATM技术给好能满足校园网的基本需求,因而大多数校园网的建设采用ATM技术。     

Intelligent Agents for ATM Network Control and Resource Management: Experiences and Results from an Implementation on a Network Testbed

This paper presents the architecture and implementation of a distributed multi-agent system designed to provide flexible control and efficient resource management of a communications network. The system architecture enables different service providers and the network provider to use different control algorithms on the same logically partitioned physical infrastructure. All the mechanisms have been implemented and successfully tested on real experimental telecommunications networks. The system components are first described and then results from experiments and performance issues are discussed. The problem of interfacing a multi-agent system to network devices is then discussed. Interfacing agents with the network requires some form of programmable interface, since it is necessary, for example, to override conventional ATM signaling. At the moment programmable network device interfaces are not always available, particularly in commercially available devices and, thus, generic operations using management protocols have to be used. A generic architecture for embedding custom network control functionality into ATM networks is described.