ATM交换机及其网络试验

ＡＴＭ是异步转送方式（ＡｓｙｎｃｈｒｏｎｏｕｓＴｒａｎｓｆｅｒＭｏｄｅ）的简称，现在被公认为是实现宽带多媒体网络的核心技术，本文介绍了ＡＴＭ交换机的一般功能，组成和结构，并介绍了以国内自主开发的ＢＴＯ－９５００ＡＴＭ交换机为核心的国内ＡＴＭ试验网。     

中兴ATM接入技术

文章首先简介了ＡＴＭ技术及其应用，重点介绍了中兴公司的ＡＴＭ网络技术，包括已研制的ＡＴＭ接入交换机的功能与应用，以及中兴宽带接入网技术。     

中国工商银行总行多媒体办公网络系统

一、网络组成工总行新办公大楼多媒体办公网络系统建立在总行新办公大楼ＡＴＭ主干网络基础上，ＡＴＭ主干网络负责提供ＡＴＭ交换平台和１５５ＭＡＴＭ多模光纤接人。整个多媒体办公网络系统从地理上可分为：新大楼楼层、旧大楼楼层和新大楼中心机房等三部分组成。新大楼楼层和旧大楼楼层中配置了ＡＴＭ接入交换机和近百台多媒体桌面电脑，ＡＴＭ桌面接入交换机通过１５５ＭＡＴＭ多模光纤与ＡＴＭ主干网络相连，多媒体电脑直接接入ＡＴＭ桌面交换机上的２５ＭＡＴＭ端口。新大楼中心机房中配置的多媒体网络设备包括：多媒体视频服务器、视…     

ATM交换结构及其特点

ＡＴＭ技术已被公认为下一代网络世界的核心技术，ＡＴＭ交换机是组成ＡＴＭ网络的关键部件。文章详细讨论了ＡＴＭ交换机的各种交换结构，比较它们的优缺点，提出一种修正的Ｂａｔｃｈｅｒ－ｂａｎｙａｎ交换结构。     

ATM网络技术及应用

本文摘要介绍了ＡＴＭ技术的基本原理和ＡＴＭ与传统网络的互连技术，如局域网仿真，ＡＴＭ上。国际协议ＩＰ，多协议ＭＰＯＡ和ＡＴＭ上的ＩＰ交换机等。每种技术均有其优点和不足，选用休种完全取决于用户的应用需求。     

ATM局域网硬件系统

ＡＴＭ局域网硬件系统●杨卫平在ＡＴＭ局域网（ＬＡＮ）中，交换机和主机间的每一物理连接或主机间的物理连接都是点对点的，因而组建一个ＡＴＭ局域网需要两类硬件：一类是ＡＴＭ主机接口卡，它使得主机能够连到ＡＴＭ网络上；另一类为ＡＴＭ交换机，它作为网络结点出现...     

ATM交换系统的功能与技术要求

文章在阐述ＡＴＭ交换机各种分类和容量的基础上，介绍了ＡＴＭ交换机所支持的各类业务，最后详述了ＡＴＭ交换系统的三大功能及相关技术要求。     

ATM原理和新颖ATM交换机

文章介绍了异步传送模式ＡＴＭ的原理，然后指出目前ＡＴＭ交换机存在的不足，最后提出一种新颖的ＡＴＭ交换机。     

实用化的ATM交换机中组播通信的实现

ＡＴＭ是面向连接的技术,实现组播通信／广播通信是ＡＴＭ交换机优越于现有ＳＴＭ交换的重大体现,也是ＡＴＭ技术能否在现有网络基础上普遍应用的关键。在共享缓存型ＡＴＭ交换机冲,组播通信的实现是一项重点和难点,本文介绍我院研制的共享缓存型ＡＴＭ交换机中组播通信的设计与实现方法。     

ATM骨干交换机购买指南

ＡＴＭ骨干交换机购买指南一、明确需求ＡＴＭ是一项处于发展变化中的技术，有关ＡＴＭ的标准尚处在不断完善的过程中，ＡＴＭ交换机产品的现状也是如此。这并不说明ＡＴＭ是不稳定的或者实施ＡＴＭ网络还为时过早。事实上，所有这些变化的有利之处在于，不断改进的性能和...     

Preventing internal and external conflicts in an input buffering reverse baseline ATM switch

When two or more packets that are destined to the same output of an ATM switch arrive at different inputs, buffers at inputs or outputs are used to queue all but one of these packets so that external conflict is prevented. Although input buffering ATM switches are more economical and simpler than output buffering ATM switches, significant loss of throughput can occur in input buffering ATM switches due to head‐of‐line (HOL) blocking when first‐in–first‐out (FIFO) queueing is employed. In order to avoid both external conflict and alleviate HOL blocking in non‐blocking ATM switches, some window‐based contention resolution algorithms were proposed in the literature. In this paper, we propose a window‐based contention resolution algorithm for a blocking ATM switch based on reverse baseline network with content addressable FIFO (CAFIFO) input buffers. The proposed algorithm prevents not only external conflicts but also internal conflicts, in addition to alleviating HOL blocking. This algorithm was obtained by adapting the ring reservation algorithm used on non‐blocking ATM switches to a reverse baseline network. The fact that a non‐blocking network is replaced by a log₂ N‐stage reverse baseline network yields a significant economy in implementation. We have conducted extensive simulations to evaluate the performance of reverse baseline network using the proposed window‐based contention resolution algorithm. Simulation results show that the throughput of reverse baseline network can be as good as the throughput of non‐blocking switches if the window depth of input buffers is made sufficiently large. Copyright © 2000 John Wiley & Sons, Ltd.     

异步传递模式的协议原理及其关键技术的研究进展

异步传递模式（ATM）一致被看成宽带数据骨干网的基础传输技术。本文首先简要介绍ATM协议的基本结构和ATM信元交换的基本原理,并说明ATM网络的资源管理方案,然后具体分析ATM信元交换及其与IP网结合所面临的一些关键技术问题,并讨论了解决这些问题所采用的方法及其研究进展,最后总结了今后有关ATM技术应用急需解决的一些问题。     

Survey of switching techniques in high-speed networks and their performance

One of the most promising approaches for high speed networks for integrated service applications is fast packet switching, or ATM (asynchronous transfer mode). ATM can be characterized by very high speed transmission links and simple, hard-wired protocols within a network. To match the transmission speed of the network links, and to minimize the overhead due to the processing of network protocols, the switching of cells is done in hardware switching fabrics in ATM networks. A number of designs have been proposed for implementing ATM switches. Although many differences exist among the proposals, the vast majority of them are based on self-routeing multistage interconnection networks. This is because of the desirable features of multi-stage interconnection networks such as self-routeing capability and suitability for VLSI implementation. Existing ATM switch architectures can be classified into two major classes: blocking switches, where blockings of cells may occur within a switch when more than one cell contends for the same internal link, and non-blocking switches, where no internal blocking occurs. A large number of techniques have also been proposed to improve the performance of blocking and non-blocking switches. In this paper, we present an extensive survey of the existing proposals for ATM switch architectures, focusing on their performance issues.     

模块化结构的ATM交换节点的性能分析

模块化结构是形成大容量ＡＴＭ交换节点的最有效手段，本文提出一种分析模块化结构的ＡＴＭ交换节点性能的新方法，该方法通过引入虚队列考虑了相邻模块间的相关性，与计算机模拟相比，分析结果在整个负载变化范围内都有很高的准确性，方法适用于任意大小模块并采用输出排队和以Ｂａｎｙａｎ网为互连网的ＡＴＭ交换节点的性能分析。     

ATM应用技术研究

ＡＴＭ（ａｓｙｎｃｈｒｏｎｕｓｔｒａｎａｆｅｒｍｏｄｅ）是实现Ｂ－ＩＳＤＮ宽带通信的基础与核心技术，本文从ＡＴＭ的基本特性及其应用业务入手，对ＡＴＭ交换机的技术要点，ＭＳＳＲ和ＢＡＮＹＡＮ交换方式及网络技术应用进行了理论研究与探讨，提出了ＡＴＭ的实现模式。     

Simulation of the Tree Algorthm in ATM Networks

ＡＴＭｉｓｄｅｐｅｎｄｅｎｔｏｎｔｈｅｄｉｆｆｅｒｅｎｔｃｈａｒａｃｔｅｒｉｓ ｔｉｃｓｉｎａｎｉｎｔｅｇｒａｔｅｄｗａｙｔｏｔｒａｎｓｍｉｔｓｅｒｖｉｃｅｓ[1 ] .ＡＴＭｎｅｔｗｏｒｋｍａｙｉｎｃｌｕｄｅｖｉｄｅｏ ,ｖｏｉｃｅａｎｄｉｍａｇｅｓ,ｉｎｔｅｒａｃｔｉｖｅｃｏｍｐｕｔｅｒｄａｔａａｎｄｆｉｌｅｔｒａｎｓｆｅｒｓ.Ａｎｉｍ ｐｏｒｔａｎｔａｐｐｌｉｃａｔｉｏｎｏｆａｎＡＴＭｎｅｔｗｏｒｋｉｓｔｏｓｕｐｐｏｒｔｍｕｌｔｉｍｅｄｉａｓｙｓｔｅｍｓ,ｓｕｃｈａｓｖｉｄｅｏｃｏｎｆｅｒｅｎｃｉｎｇ…     

Network segment mobility in ATM networks

This article describes the extension of the ATM PNNI v.1 protocol to support the mobility of ATM network segments, consisting of one or more ATM switches, relative to a fixed ATM infrastructure. An application scenario involving an ATM network onboard an aircraft in flight that maintains ATM connectivity via satellite with the ground network is adopted for illustrative purposes. While both routing and handover are key elements necessary to provide mobility, the current work addresses only the former. The article concludes with a discussion of the advantages and limitations of the proposed approach     

雷达组网通信中的ATM交换机

介绍了ＡＴＭ交换技术在雷达组网通信中的应用。通过对基于中央处理站的雷达组网通信技术需求的分析，提出了一种类似于用户—服务器模式的ＡＴＭ交换结构。ＡＴＭ技术是Ｂ—ＩＳＤＮ的基础，ＡＴＭ交换技术是ＡＴＭ技术的核心，它不仅可用于民用通信业务，而且对于电子干扰环境下雷达网对密集多目标跟踪时所涉及的通信业务也很有效。文章对ＡＴＭ交换机在雷达网中的数据交换作了分析，并以计算机仿真手段评估了三种特定通信环境下输出缓冲型ＡＴＭ交换机的利用率和输出队列概率分布情况。     

Designing a practical ATM LAN

The adaptor cards and driver software for workstations and local asynchronous transfer mode (ATM) switches and switch control software used in an ATM local area network (LAN) system are discussed. It is shown that the ATM hardware and software components together provide services that are essential for ATM to be considered a realistic alternative to current shared-media LANs. These services include: completely transparent support for the TCP/IP protocol suite, an application programming interface for full access to the underlying ATM capabilities, support for AAL5, AAL3/4, and the null AAL, both connection-oriented and connectionless service, dynamic connection establishment or switched virtual circuits, resource reservation of guaranteed bandwidth and quality of service, full-bandwidth multicast and broadcast, virtual path and channel routing among multiple switches, automatic configuration and failure recovery, dynamic address assignment and internetwork address resolution, and network management via the simple network management protocol (SNMP)     

Scalable optoelectronic ATM networks: the iPOINT fully functionaltestbed

Our prototype of a fully-functional asynchronous transfer mode (ATM) switch validates the design of a 128 Gb/s optoelectronic ATM switch. Optoelectronics, rather than all optical components, are used to simultaneously address all of the specific requirements mandated by the ATM protocol. In this paper, we present the Illinois pulsar-based optical interconnect (iPOINT) testbed, and present our results obtained for the prototype switch in a working environment consisting of an optical network of Sun SPARC Stations and other local and wide-area ATM switches