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     

Internet综合业务模型在IP-ATM互联网络的服务映射

在ＩＰ－ＡＴＭ互联网络环境,ＡＴＭ子网在ＩＰ主机通信经过的路径上,ＡＴＭ网络边缘（入口和出口）设备将ＩＰ与ＡＴＭ网络物理上互联起来．在这种互联网络环境支持ＩＳ服务的时候,资源预约机制在ＩＰ网络实现资源预约,在ＡＴＭ子网,由边缘设备执行ＩＷＦ（ｉｎｔｅｒｗｏｒｋｉｎｇｆｕｎｃｔｉｏｎ）功能,为ＡＴＭ子网进行资源预约代理．边缘设备执行的ＩＷＦ功能中,一项重要的工作是进行ＩＰＩＳ服务模型到ＡＴＭＱｏＳ模型的服务映射,通过服务映射,在ＡＴＭ子网入口边缘设备和出口边缘设备之间建立起满足ＩＳ服务要求的ＶＣ连接,并对连接进行管理．文中给出互联环境中,ＩＳ服务模型到ＡＴＭＱｏＳ模型的服务类型和服务参数映射解决方案,在进行服务参数映射的时候基于流模型提出利用边缘设备的缓存调节数据流参数映射,并导出相应的公式．     

Internet综合业务模型在IP—ATM互联网络的服务照射

在ＩＰ－ＡＴＭ互联网络环境,ＡＴＭ子网在ＩＰ主机通信通过的路径上,ＡＴＭ网络边缘（入口和出口）设备将ＩＰ与ＡＴＭ网络物理上互联起来。在这种互联网络环境支持ＩＩＳ服务的时间,资源预约机制在ＩＰ网络实现资源预约,在ＡＴＭ子网,由边缘设备执行ＩＷＦ（ｉｎｔｅｒ ｗｏｒｋｉｎｇ ｆｕｎｃｔｉｏｎ）功能,为ＡＴＭ子网进行资源预约代理。边缘设备执行的ＩＷＦ功能中,一项重要的工作是进行ＩＰ ＩＩＳ服务模型到ＡＴ     

IP Over ATM的新进展

简要比较了ＡＴＭ（异步传输模式）的３种支持方案，并介绍ＩＰＯｖｅｒＡＴＭ在两个方面，即ＩＥＴＦ的“集成服务Ｉｎｔｅｒｎｅｔ”概念（包括ＲＳＶＰＩＰＶ６等）和下一站地址解析协议的新进展。     

NOVELL网上的点对点通信

本文详细分析了ＮｅｔＷａｒｅ的网络层／传输层协议ＩＰＸ／ＳＰＸ；并就如何开发ＮＯＶＥＬＬ网上的点对点通信应用程序，给出了设计实例。     

IP over ATM模型上集成服务的实现技术

文章对 Ｉｎｔｅｒｎｅｔ的集成服务和 ＡＴＭ的 ＱＯＳ要求进行了分析,并讨论了将基于 ＩＰ协议的 ＲＳＶＰ与 ＡＴＭ的 ＱＯＳ控制和管理相结合,以实现 Ｉｎｔｅｒｎｅｔ与 ＡＴＭ集成中的多业务 ＱＯＳ的主要技术。     

基于ATM实现MPLS的关键技术探讨

ＭＰＬＳ（多协议标记交换）被认为是当前各种 ＡＴＭ支持 ＩＰ技术中的最佳方案,将成为 ＡＴＭ下一步发展和演进的方向。但是 ＡＴＭ向 ＭＰＬＳ发展时具有很多不同于基于传统路由器的 ＭＰＬＳ网络的特点。该文从标记堆栈的封装、环路控制、扩展性与流合并中的信元交织、ＡＴＭ协议与ＭＰＬＳ协议的关系、Ｍ的处理和对ＩＰ Ｏ＆Ｍ的支持５个方面对基于ＡＴＭ的ＩＳＲ和基于ＡＴＭ的ＭＰＬＳ网络的实现这些最基本和最关键的问题进行了综合讨论,并比较了各种可能的方法的优缺点。     

IP Switching—ATM网络交换技术的发展趋势

本文基于ＡＴＭ异步传输模式的技术特点,介绍一种高性能的网络交换协议（ＩＰ）,从而提高ＡＴＭ的网络资源效率,改装ＡＴＭ系统的多协议交换,ＩＰ Ｓｗｉｔｃｈｉｎｇ交换技术的引入,推动着ＡＴＭ新技术向广泛的适应性、兼容性和理论上可攀登性的方向发展。     

DSL技术发展前瞻

ＳＯＨＯ十分关注ＤＳＬ市场的增长,并要求ＤＳＬ架构必须支持虚拟专用网（ＶＰＮ）、 ＩＰ上话音（ＶｏＩＰ）、 ＡＴＭ上话音（ＶｏＡＴＭ）和视频等新的应用业务。数据业务的增长导致了用户对网络设备和使用多种技术（以太网到帧中继和帧中继到ＡＴＭ）的日趋复杂的网络的需求,并要求增加新的传输媒介（如电缆调制解调器）和传输端口。除数据外,传输话音和视频的融合网络必将成为标准网络。     

ADSL宽带接入技术

ＩＰ发展的潮流已不可逆转,整个数据领域正向着ＩＰ领域方向大跨步前进。尤其是在接入方面更是如此,ＩＰ技术已经牢牢控制着绝大部分前台及桌面的应用。因此,在ＡＤＳＬ的实际接入应用方面,就必须向ＩＰ接入方向靠拢,走ＩＰ接入的发展之路。ＲＦＣ１４８３－Ｂｒｉｄｇｅｄ——桥接接入方式最初,ＲＦＣ１４８３标准的制定是为了实现网络层上多种协议的数据包在ＡＴＭ网络上的封装传送。它已被广泛使用于ＡＴＭ技术中,现已成为在ＡＴＭ网络上处理上层多种协议数据包的封装标准。ＡＤＳＬ接入依托于ＡＴＭ骨干网络,在接入侧上继承了许…     

Dynamicmultimedia protocol stacks

Fixed end-system protocols are unable to support the wide range of applications requirements on top of current networks without adding overhead in the form of unnecessary functionality for multiple combinations of application requirements and networks.This paper presents the Real-time Wide Area Network Dissemination Architecture Protocol (RWANDA), which dynamically configures multimedia protocol stacks to support a wide range of application requirements and to increase performance. It overcomes synchronous limitations by providing an asynchronous group communication model. Applications only pay for required quality of service (QoS) such as multicast, virtual synchrony and encrypted communication.In RWANDA, information sources use channels to disseminate information to a potentially large and changing set of channel subscribers. RWANDA recognises the differing media characteristics and transport requirements of multimedia by providing a protocol composition framework that extends to incorporate yet unsupported communication protocols, qualities of service and optimised multimedia stacks. RWANDA provides an asynchronous foundation necessary for developing a large-scale wide area network continuous media protocol.     

SIP软交换系统群呼的实现

SIP(Session Initiation Protocol)是IETF提出的在IP网络上进行多媒体通信协议,它是基于文本的应用层控制协议,独立于底层协议,用于建立、维护、终结多媒体会话和呼叫。软交换作为下一代网络(NGN)的核心技术,为具有实时性要求的业务提供呼叫控制和连接控制功能。通过分析基于SIP的语音类业务应用的现状及未来的发展趋势,并对相关的主要协议和关键技术进行研究,在此基础上,提出了基于SIP的软交换系统,并实现了系统中的群呼业务功能。     

多媒体数据会议协议ＭＣＳ分析与实现模型

多点通讯服务（ＭＣＳ）是多媒体数据会议底层通信协议中的核心部分,在分析它的原理和关键机制基础上进一步提出符合协议的应用模型ＭＣＨＡＴ,并阐述其设计和编程接口.     

VC下实现基于Modbus协议的DCS与远程I/O系统通信

本文在分析Modbus协议及其通信原理的基础上，结合工程实际，提出了一种在工业PC机上实现串行通信的方法，并在Visual C 6．0环境下开发了通信的应用程序，实现了基于Modbus协议的DCS与远程I／O系统通信。     

Receiver-initiated communication with ST-II

As part of its work on the Heidelberg Transport System (HeiTS) for multimedia communication, the IBM European Networking Center (ENC) has implemented the Experimental Internet Stream Protocol, Version 2 (ST-II). ST-II is a connection-oriented internetworking protocol for multiple-destination communication of real-time data such as digital audio and video. Although ST-II fits well into typical multimedia application scenarios, some functions are still missing No mechanisms are provided for receiver-initiated communication, allowing receivers to join streams, specify their quality of service (QOS) requirements, or initiate stream establishment and resource reservation. In this paper, we present some extensions to tile protocol that make it fulfill the receivers' needs move adequately. Our approach allows intermediate nodes to execute stream management functions on behalf of the sender. This way, the protocol scales better with the number of receivers per stream, as the origin does not need to track every target.     

IMS Application Servers: Roles, Requirements, and Implementation Technologies

The IP multimedia subsystem (IMS) defines a generic architecture to support communication services over a Session Initiation Protocol (SIP) infrastructure. In the IMS architecture, application servers host and execute the IMS service logic. These servers can be SIP application servers, open services architecture (OSA) application servers, or a customized applications for mobile networks using enhanced logic (Camel) service environment. Some technologies used in telephony and voice-over-IP (VoIP) application servers are also applicable to IMS application servers, but such servers have some unique requirements that could limit the extent to which these technologies can meet them.     

A biometric-based authenticated key agreement scheme for session initiation protocol in ip-based multimedia networks

Multimedia Tools and Applications - Session Initial Protocol (SIP) has been widely adopted for signaling and controlling interactive sessions in multimedia communication networks. Despite its...     

Building self-optimized communication systems based on applicative cross-layer information

This article proposes the Implicit Packet Meta Header (IPMH) as a standard method to compute and represent common QoS properties of the Application Data Units (ADU) of multimedia streams using legacy and proprietary streams’ headers (e.g. Real-time Transport Protocol headers). The use of IPMH by mechanisms located at different layers of the communication architecture will allow implementing fine per-packet self-optimization of communication services regarding the actual application requirements. A case study showing how IPMH is used by error control mechanisms in the context of wireless networks is presented in order to demonstrate the feasibility and advantages of this approach.     

QRTP: A Middleware for Broadband Networks

Broadband networks, such as those based on Asynchronous Transfer Mode (ATM), provide large bandwidth and multiple services. An essential application area for broadband networks is multimedia systems. The development of multimedia applications, however, is currently lagging behind the advances in the network technology. Our approach to the problem of more effectively developing multimedia applications is to provide developers with a middleware that encompasses a set of broadband-specific services needed by multimedia applications, for instance virtual connection setup, bandwidth reservation and session synchronization. Our middleware, called the Queen's Real-time Transport Protocol (QRTP), is based on the Real-time Transport Protocol standard from the Internet Engineering Task Force. The paper discuses the design, implementation and evaluation of the QRTP middleware.     

IP网络实时媒体应用系统的设计及实现

首先分析了网络实时媒体的相关协议RTP和RTCP ,然后在DirectShow平台上设计了两组过滤器分别用于音频流和视频流的发送与接收 ,实现了IP网上音频 /视频媒体流的实时传输 ,并提出了一种崭新的网络实时媒体应用系统开发模式 ,即组件化程序设计方法 +RTP协议。实验表明该模式下的应用系统具有实时性好、容错性强、扩展性强、代码重用率高、支持应用系统间互操作等特点。