Packet optical networks for high-speed TCP-IP backbones

This article presents a new proposal for TCP-IP backbone implementation based on optical packet switching technology. The proposed network architecture merges the flexibility in resource management of packet switching with the high capacity offered by full optical technology     

Interconnecting solved subsystems

A tableau approach to the interconnection of solved sub-systems is presented which preserves their separate identity, but which allows full use of available sparse-matrix techniques.     

东山再起的无线局域网(WLAN)

1 引言 无线局域网（WLAN）本身并不是新概念、新技术,它已存在10多年了。顾名思义,WLAN是用无线通信技术构建的局域网,虽不采用缆线,但也能提供传统有线局域网的所有功能。与有线局域网相比,WLAN具有一定移动性、灵活性高、建网迅速、管理方便、网络造价低、扩展能力强,但WLAN的网络产品较贵、硬件初始投资比有线局域网高、传输速率较低。WLAN还有一个好处是它使用不需许可证的2.4GHz频段,其运营者不用花钱申请频谱许可证,随时可以建网使用。     

Problems in large LANs

Some of the dynamic effects that occur in large local area networks (LANs) are described. Effects are considered at three different levels: single-network segments, connections between adjacent segments, and problems that appear only in large networks. To a large extent, the discussion is based on recent experience within the internet community. However, the observations should apply, in a general way, to large networks using other protocols as well     

用卫星ATM技术互连LAN/MAN

介绍了一般的卫星ATM网络互连单元,重点讨论了互连LAN／MAN的ASIU的结构,并指出了设计LAN／MAN互连技术应该考虑的基本问题,最后指出用卫星ATM实现LAN／MAN互连所面临的挑战。     

Interconnecting networks with optimized service provisioning

Telecommunication Systems - A recent trend of peering at geo-diversified Internet exchange points (IXPs) has empowered decades-old proposal of inter-networking and opened up new avenues of business...     

Advances on Wireless LANs and PANs

Call for Papers

Advances on Wireless LANs and PANs     

互连线RC模型应用条件的仿真研究

研究结果表明,在L与RC比值较小时,阶跃响应的上升时间基本上由RC的乘积决定,电感对电路的影响可以忽略,互连线采用RC模型与RLC模型结果应无多大差别。在L与RC比值较大时,阶跃响应曲线出现振荡,此时使用RC模型需满足工作频率低于RC模型的“上限使用频率;当工作频率超过RC模型的“上限使用频率”时,互连线的模型就必须采用RLC模型。RC模型的“上限使用频率”仅与互连线长度有关:fmax106(Hz·m)。     

数字电视中心媒资系统互联及接口模式

主要介绍设计数字电视中心媒体资产管理系统时,对数据编码方式、存储码率的选择、编目检索码率及编码方式的选择等几个方面的考虑,供同行参考。     

公用无线IP移动局域网

未来Internet的应用应包含Internet话音、视频多播和交互式多媒体业务，其基本要求为高速率和低时延，即使第三代蜂窝移动通信网也不能全部满足这些业务要求。目前，迅猛增长的Internet业务和不断发展的无线技术激发了蜂窝移动通信系统和无线LAN(WLAN)接入系统的结合,给移动用户提供接入Internet和基于位置的业务。WLAN与有线网结合可以低成本、高容量和易升级方式接入Internet，而现有的WLAN接入系统的主要缺点是无线接口单一和缺少公众用户接入，从而限制了业务的扩展。基于IP的公用接入移动LAN（PamLAN，Public Access Mobi…     

Videoconferencing on LANs: Issues and Proposals

Progress in video coding, microprocessor and LAN switching technologies justify PC-based LAN videoconferencing. The key benefit is an improvement in productivity and savings in time and effort. This article reviews LAN video conferencing issues and potential solutions.     

NGN的互联互通模型

针对现有两两互联互通网络模型的不足，提出了一种用于NGN的中心型互联互通网络模型，解决了现有网络模型的不足，并对该中心型网络模型的商用作进一步的探讨。     

微波倒装焊互连技术及特性分析

随着应用频率的提高,微波芯片与基板间的互连更多地采用了倒装焊。文中用HFSS（高频结构仿真器）有限元软件对凸点变换及倒装互连结构进行建模、仿真和优化,提取了凸点变换的等效集总电路模型,介绍了凸点制作工艺和倒装焊结构互连的微组装过程,并完成了试验样品的测试。最后,对微波倒装焊的前景进行了展望。     

Congestion control in interconnected LANs

The reasons why congestion control is more difficult in interconnected local area networks (LANs) than in conventional packet nets are examined. The flow and congestion control mechanisms that can be used in an interconnected LAN environment are reviewed. The focus is on congestion control (that is, prevention of internal congestion); however some of the proposed schemes require the interaction of flow and congestion control. The schemes considered are dropping packets; input buffer limit, i.e. a limit on the number of input packets (i.e. packets from local hosts) that can be buffered in the packet switch; the use of choke packets, in which, whenever a bridge or router experiences congestion, it returns to the source a choke packet containing the header of the packet traveling in the congested direction and the source, on receiving the choke packet, declares the destination congested, and slows (or stops altogether, for a period of time) traffic to that destination; backpressure, which is the regulation of flow along a virtual connection; and congestion prevention, whereby a voice or video connection is accepted only if there is enough bandwidth (in a statistical sense) in the network to support it