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。     

支持综合业务的Internet-ATM网络及互联

文中阐述了Ｉｎｔｅｒｎｅｔ上综合业务的模式,介绍了资源预订协议ＲＳＶＰ、Ｉｎｔｅｒｎｅｔ流协议ＳＴ－ＩＩ、资源预先预订协议ＲｅＲＡ和几种主要的Ｉｎｔｅｒｎｅｔ与ＡＴＭ主干网络的互联协议以及传统的ＴＣＰ／ＩＰ协议族的报文在ＡＴＭ网络中传送的协议ＩＰ ｏｖｅｒＡＴＭ;阐述了局域网模拟ＬＡＮＥ的体系结构及其实现的一个实例和ＡＴＭ上支持多种网络层议（如ＩＰ,ＩＰＸ／ＳＰＸ,ＡｐｐｌｅＴａｌｋ等）的规范ＭＰ     

ATM—LAN子网间寻路的关键技术——MPOA

ＭＰＯＡ技术综合利用ＬＡＮＥ和ＮＨＲＰ协议来提供ＡＴＭ交换网络上的路由功能。在ＭＰＯＡ系统中的任何两个ＭＰＯＡ主机或边缘设备之间能够建立捷径－ＡＴＭ交换虚连接,使得数据路径绕过中间路由器,ＭＰＯＡ技术为ＡＴＭ上错综复杂的网络层协议提供了统一的规范,使ＡＴＭ和传统ＬＡＮ的优势都得到了体现。     

ATM上的多重协议：对MPOA的分析与探讨

ＡＴＭ技术正应用于高速网络互连之中，以其不同于传统路由器的特点而逐步显示出其优越特性。文中介绍了ＡＴＭ上的多重协议－ＭＰＯＡ的３种模型，详细分析了它们的路由特点、信息格式、基本操作等内容。讨论了它们各自的优缺点及解决措施。     

ATM over ADSL的接入系统研究

ＡＴＭ（异步传输模式）作为宽带网络应用中的骨干网技术已经得到了广泛应用。 ＡＤＳＬ（不对称数字用户环路）则是目前重要的网络接入技术。本文分析了在ＡＤＳＬ上传输ＡＴＭ信元的原理和系统的模型,并对其各分层模块功能及相关的协议作了介绍,同时提出了一个实际传输系统的设计方案。     

ATM适配层数据通信协议研究

本文讨论了ＡＴＭ网络用于数据通信的ＡＴＭ适配层协议：ＡＡＬ３／４和ＡＡＬ５，研究其协议格式，传输效率。在此基础上，提出了一种具有ＡＡＬ３／４，ＡＡＬ５协议优点的ＭＡＡＬ３协议，并对这三种协议的功能，传输效率进行了比较研究。     

LAN仿真与ATM网络

ＬＡＮ仿真（ＬＡＮＥｍｕｌａｔｉｏｎ－ＬＡＮＥ）就是为现有的多种ＬＡＮ协议在ＡＴＭ网络上运行提供一种可行的办法，实现ＡＴＭ网络与现存的以太网、令牌网和ＦＤＤＩ等互操作。本文介绍了ＬＡＮ仿真技术及其规范模型，并对ＬＡＮ仿真系统与虚拟ＬＡＮ等有关技术进行了分析     

一种新的高性能网络——异步传输模式局域网

本文论述了把异步传输模式（ＡＴＭ）引入到局域网（ＬＡＮ）的必要性和应用前景，提出了如何构成ＡＴＭＬＡＮ和用软硬件来设计ＡＴＭＬＡＮ的机理与方法，对ＡＴＭＬＡＮ的基本概念，协议模型，互连技术，体系结构和网络样式进行了探讨，其目的是推动ＡＴＭＬＡＮ在我国的研究发展和应用。     

中国第一个B－ISDN示范网络在穗展示

中国第一个Ｂ－ＩＳＤＮ示范网络在穗展示广州华美电讯有限公司和广东省邮电管理局日前在广州展示了中国的第一个Ｂ－ＩＳＤＮ（宽带综合业务数字网）应用网络。该网络采用了ＡＴ＆Ｔ提供的当今世界最先进的ＡＴＭ（异步传输模式）技术和２．５Ｇｂ／ＳＳＤＨ（同步数字传...     

ATM上的多重协议——对MPOA的分析与探讨

ＡＴＭ技术正应用于高速网际互连之中，以其不同于传统路由器的特点而逐步显示出其优越特性。本文介绍了ＡＴＭ上的多重协议－ＭＰＯＡ的三种模型，详细分析了它们的路由特点、信息格式、基本操作等内容，讨论了它们各自的优、缺点及解决措施。     

基于LAN的并行计算环境

文章给出厂一个这种模型的并行计算机系统，设计了一个简单的工作算法．并对该算法的性能进行了分析，最终发现影响并行计算的性能的主要因素——传输速度。为了提高其性能，必须对传输介质、传输设备和通信协议等进行改造。     

A High Performance Message-Passing System for Network of Workstations

With the proliferation of Network of Workstations (NOW) environment, there has been a great demand for a high performance message-passing system to implement High Performance Distributed Computing (HPDC) applications over NOW environment. NYNET (ATM wide area network testbed in New York state) Communication System (NCS) is a multithreaded message-passing system developed at Syracuse University that provides low-latency and high-throughput communication services over the Asynchronous Transfer Mode (ATM) based HPDC environment. NCS provides High Performmance Application Communication Interface (HPI) to support applications that demand high-throughput and low-latency communication services.This paper outlines the general architecture of NCS and presents the implementation approach of NCS HPI over an ATM network. This interface has been developed by modifying Fore Systems' ATM Application Programming Interface (API) and its device driver. NCS HPI uses read/writetrap routines to bypass traditional operating system calls and kernel-level communication interface (e.g. UNIX System V Streams). It reduces latency, data transfer time, and avoid using traditional communication protocols (e.g., TCP/IP). This substantially improves the communication performance.     

网络并行计算中矩阵QR分解的并行算法

随着高速网络技术（如ＡＴＭ）的出现,网络并行计算系统（ＮＯＷ）已成为并行处理的主要平台,由于它的高通信延迟,某些在并行机上实现的细粒度并行算法已不适合在该环境下运行。为此,有必要对算法重新进行任务划分,研究它在网络环境中的并行实现。基于这一点,本文对矩阵的ＱＲ分解提出了一种新的任务划分策略,并由此得到了它的一种粗粒度并行算法,实验结果表明,设计的并行算法在网络并行计算环境中具有较高的加速比。     

一种基于异构网络的NOW中的群通信模型

工作站网络（ＮＯＷ）作为一种新的并行计算结构越来越受到人们的重视。文中讨论了基于异构网络的ＮＯＷ中群通信问题，提出了一种群通信层次模型，较好地解决了异构网络环境中的群通信问题，其实现群通信的思想是将参与群通信操作的结点按它们所处的子网分成一个个基计算域，通过这些基计算域的并行操作来达到降低通信时延同时又不增加太多网络流量的目的，并且还可以在不同的子网中选择最合适的群通信实现，这一做法做全网面向过程     

On the design of secure ATM networks

Asynchronous Transfer Mode (ATM) is seen to be a technology that allows flexibility, efficiency and manageable bandwidth on demand to be achieved in high-speed networks. ATM is able to support a variety of applications including voice, video, image and data with different quality of service requirements. This paper addresses the design and implementation of security services and mechanisms in ATM networks. The paper examines the various design options for the placement of security services within the ATM protocol reference model and considers their advantages and disadvantages. The option of placing the security layer between the ATM Adaptation Layer (AAL) and the ATM layer is selected and the design of security services such as confidentiality, integrity and data origin authentication services in the user plane are described. The paper then presents an authentication scheme and key establishment protocol. This protocol is integrated with the existing ATM signaling protocols as part of the call setup procedures in the control plane. Then the paper discusses a public key infrastructure for the ATM environment and considers the design of public key management protocols between ATM nodes and Certification Authority for initializing, retrieving and distributing public key certificates. Finally, the paper considers the design of access control service for ATM networks and discusses the issues involved in the provision of access control mechanisms both at the connection setup phase and during the user data transfer phase. It seems that the developed security design can be transparently integrated to secure ATM networks.     

基于ATM局域网的并行计算中的通信问题的研究

本文首先介绍了并行计算中的通信问题和ＡＴＭ局域网的特点，然后讨论了已有的关于以ＡＴＭ局域网为基础的ＮＯＷ环境中并行计算中的通信问题的研究。最后，指出了进一步应研究的问题及研究方法     

A priority media access control protocol for video communication support on CSMA/CD LANs

Real-time multimedia communication applications demand performance requirements which differ significantly from conventional data communication applications. Current local area networks (LANs) provide efficient transport for bursty data traffic; however, they cannot necessarily provide quality of service guarantees for real-time communications. In this work we introduce and investigate an experimental priority protocol for supporting real-time communication on Ethernet, a popular implementation of multiple-access broadcast bus LANs. We examine the new protocol, known as Priority Mode-CSMA/CD (PM-CSMA/CD), providing a high priority (HP) class with CSMA/CD employed for standard priority (SP) traffic. PM-CSMA/CD performance is examined through computer simulation of videotelephony workstations operating over the shared bus LAN. Over all observed traffic conditions, the priority protocol provides performance satisfying real-time packet transport requirements of audio and video streams. The primary advantage of our protocol over similar priority schemes is its physical layer compatibility with standard CSMA/CD. The protocol also provides improved channel utilization with increasing high priority load, with no penalty in SP class performance at low to medium network loads.     

UDP的Java聊天程序

UDP是OSI参考模型中一种无连接的传输层协议,它提供了简单不可靠的信息传送服务。由于UDP比较简单,UDP头包含很少的字节,所以它在速度方面有很大优势。很多常用的即时通软件,如QQ程序,都会使用UDP实现很多基本功能。Java语言是当今流行的网络编程语言,它的API封装了UDP编程的类,用来实现UDP聊天程序很容易。     

基于Myrinet/GM的多通道通信

通信子系统对并行系统的计算效率有重要影响,大规模应用对并行平台的通信性能和可用性提出了挑战性的要求.多通道通信技术通过并行采用多路网络链路互连来提高并行系统通信性能和可用性.首先分析了多进程复用网络对通信性能的影响,然后以Myrinet/GM网络平台为基础,提出了基于网络接口层的通信链路动态选择与分配策略,设计和实现了支持多路Myrinet网络并行通信的协议层MNC.MNC支持通信进程平等,充分地利用多路Myrinet网络链路资源.在使用2路Myrinet互连的PC机群平台上,MNC进程间通信带宽相对于单链路提高了约34%,有效地提高了应用层通信性能.