跨世纪的网络技术——ATM

ＡＴＭ技术作为Ｂ－ＩＳＤＮ的基础,在传输包括语音、图像、数据的综合业务环境中,具备有其它网络技术所没有的技术优势,介绍ＡＴＭ的分层结构、传输控制、ＡＴＭ网络的ＬＡＮ仿真,及现存在的问题和发展前景。     

ATM传输网络技术研究

本文较详细地研究了基于ＶＰ概念的传输技术和网络结构，给出了公共电信分层化的实现机制和ＢＩＳＤＮ网络结构，同时对Ｖ的优势及其对传输网络体系结构的影响也进行了阐述。     

现代网络技术的发展趋势—ATM技术

一、前言 ATM即异步传输模式(Asynchronous Transfer Mode),是一种基于信元交换的技术,它以从几百Mbps到几十Gbps的速率交换定长信元。ATM最早起源于1980年欧州发展成功的宽带综合业务数字网络(B—ISDN),近几年发展迅速,由于它的高带宽、面向连接等特点使它成为90年代及今后最有前途的一种网络技术。     

虚拟网技术与ATM

虚拟网技术和ＡＴＭ是目前网络界最为热门的两大话题，同时虚拟网也是最为令人困惑的一个领域。本文首先概括介绍了虚拟网技术，并尝试从ＯＳＩ模型的角度将现有的虚拟网技术分门别类；然后简介了ＡＴＭ技术的体系结构及其优点；最后以ＩＢＭ的ＭＳＳ服务器为例介绍了采用ＡＴＭ技术实现虚拟网络的方式。     

ATM网络技术的基本概念与原理

本文介绍ATM网络技术的基本概念、基本工作原理和特点、ATM协议参考模型以及ATM宽带通信网的发展概况。     

ATM网络研究中的计算智能技术

计算智能技术以神经网络，模糊逻辑以及遗传算法等为核心，模仿人类的思维方式及演化规律，已经在以控制为主的许多领域受到越来越多的重视。计算智能技术有着传统控制方法无法比拟的优越性，显示出强盛的生命力。ＡＴＭ网络被普遍认为是２１世纪信息高速公路的基石，是传递多媒体信息的最终解决方案。     

ATM技术及应用

本文首先主要介绍ATM技术产生背景,技术特点以及其支持的业务类型。然后在ATM技术在局域网上的应用方面,主要介绍LANE技术和MPOA技术。最后比较详细地介绍了ATM技术在新疆大学校园网中的应用。     

ATM技术与应用

ＡＴＭ技术与应用施项君伍必涵１引言异步传输模式（ＡＴＭ）是为了满足宽带综合业务数据网（ＢＩＳＳＤＮ）通信需要而发展起来的一门新技术，数据传送速率可高达２．４～１０Ｇｂｐｓ，实现包括声音、数据、图像及多媒体等在内的各种信息类型的快速交换能力，支持ＳＤＨ...     

宽带网络技术

在窄带ISDN成熟的80年代，考虑到未来技术的进步和对宽带业务的需求，电信界开始寻求一种宽带的、独立于业务的网络。这种网络要能提供高于一次群速率的业务，要能适应从低速到高速各种业务的传送与交换，做到整个网络资源共享。在80年代后期，国际电联正式提出了宽带ISDN（B-ISDN）的概念。B-ISDN的发展目标是以一个综合的、通用的网络来提供全部现有的和将来可能有的业务。为此需要开发新的信息传送技术，而人们在研究、分析了各种电路交换和分组交换技术之后，认为快速分组交换是唯一可行的技术。国际电联于1988年正式把它命名为…     

我国ATM示范网的应用业务

本文结合作者在参加我国第一个ATM示范网建设的工作经验,阐述了我国第一个ATM示范网的具体组成,重点介绍有关ATM网的应用业务,给出了作者对研制ATM网络应用业务产品的体会。期望对有关从事ATM网络及应用业务设备研制的工程师以参考。     

Overview of ATM networks: functions and procedures

The purpose of this paper is to present an overview of the ATM technique. The basic principles of the ATM transfer technique, the B-ISDN layered protocol reference model, as well as the architecture and the main functions of the ATM network, are described in this tutorial. In particular, we present the main characteristics of the ATM technique, the structure of the ATM cell, the functions which deal with the protection from errored cells (HEC procedure) and the identification of the boundaries of the ATM cells (cell delineation and scrambling). The VP/VC concept is explained in detail, and the main principles and functions of the three lowest layers (Physical, ATM and Adaptation) of the B-ISDN layered protocol reference model are surveyed. The issue of Quality of Service parameters in ATM networks is reviewed, and the problem of the allocation of the network resources in response to user demands, as well as the problems of congestion control, Usage Parameter Control (UPC) and traffic modelling in ATM networks, are assessed. Finally, we present ‘possible’ sets of traffic characterization parameters, and show how possible B-ISDN sources can be modelled according to the basic on-off ATM traffic source model.     

ATM技术与现代军事通信

本文简述了ATM技术及其发展,介绍了外军(主要是美军)试验和应用ATM的情况。     

Priority shaping of source traffic in ATM B-ISDN

A source traffic shaper based on prediction of the behaviour of the ATM B-ISDN access policer is discussed. Using this approach, it is possible, within a policed virtual circuit, to reduce both loss and delay of the high-priority cells at the expense of delay of the low-priority cells. The priority-based traffic shaping is beneficial for sources generating cell streams with differing service requirements, e.g. multimedia sources.     

Modular multicast ATM switching architecture

A modular multicast packet switching architecture is proposed for the B-ISDN/ATM. In this switching architecture, we use the abilities of a broadcast bus suitable for multicasting services. Instead of using the concatenation of a copying network and a routing network, we use the same switching network to perform both copying and routing of multicast packets. This multicast switch architecture treats unicast and multicast packets in the same way; the delay time for these two kinds of packets has the same characteristics for the affective load in the switching. Through the modularity of this switching architecture, it is easy to dimension the switching system. We also include a mathematical analysis of this architecture.     

人脸检测技术在ATM自动识别功能拓展系统中应用

针对ATM机存在的不安全因素,开发研制了ATM自动识别功能拓展系统。鉴于人脸特征的独一无二性,在现有的ATM机上增加人脸识别作为一种身份验证手段。而人脸检测是人脸识别的首要环节,采用了基于AdaBoost算法,构造了人脸检测系统。实验结果表明,该算法实现人脸检测时间在70ms左右,在环境较好的情况下,可有效检测单个人脸和多个人脸,满足了该系统的要求。     

Factors influencing ATM adapter throughput

Analytical and experimental evaluations show that ATM adapters can perform quite close to their designed limits, provided that they are used in a properly configured environment with series resources capable of sustaining the desired throughputs. While the media speed may be 155, 100 or 25 Mbps, there are a number of factors that will determine the final achieved maximum throughput observed by a user of a ATM adapter. One is the overhead inherent to ATM, such as the 5 byte ATM header that accompanies every 48 bytes of data sent. Others are inherent in the protocol used in the communication layers above ATM (e.g., pacing and retransmission associated with TCP/IP). Still others are dependent upon the processor speed and operating system used by the adapter host system. This paper discusses those parameters that, based on our experience, can have a considerable impact on the throughput of an ATM adapter. Turboways¹ 25, 100 and 155 ATM adapter measurements illustrate these issues. These represent end-to-end (application layer-to-application layer) throughput measurements, involving all supporting hardware (workstations, 8260 ATM hub/switch, 8282 ATM concentrator, etc.) and all protocol layers, operating system, etc.This work was supported in part through the 1994 and 1995 IBM SUR grants, the IBM-NCSU ATM partnership effort and NSF award ACS-9418960.     

ATM:解决因特网帯宽的新途径

本文详细介绍了ＡＴＭ网络及与传统网络相比它所具有的优势，并且明确指出 ＡＴＭ网络将是未来网络发展的趋势所在。     

在ATM网上实现局域网功能的困难及对策

ＡＴＭ网络作为下一代网络，终将成为网络的主流，但是ＡＴＭ网要在目前传统局域网占主导地位的环境条件下成为今后的主流和发展的方向，就必须解决两个问题：首先必须使已有的众的网络应用软件能在ＡＴＭ工作站上使用；第２，ＡＴＭ网应能很容易和传统的局域网连一在起的工作站一起运作用。此文介绍了 在ＡＴＭ网上实现局域网功能所面临的困难及一些可能的解决方案。     

ATM网络中ABR业务的带宽分配算法研究

在ATM网络(异步转移模式)中,ABR(可用比特速率)业务主要面向数据通信服务,ABR带宽利用率的高低与所采用的带宽分配算法有密切的关系。文中介绍了ABR业务中带宽分配的一般性原则,并讨论了一种新的带宽分配算法。