Web services architecture for user control and management of optical Internet networks

One of the primary goals of the CA*net 4 network is to provide end users with the ability, on a peer-to-peer basis, to provision, manage, and control the routing of their own lightpaths across the network without the need to signal or request services from any central network management authority or server. A novel approach to such end-user management and control of lightpaths is described, which uses Web services architecture and grid technology.     

Differentiated integrated QoS control in the optical Internet

In order to facilitate convergence of networks and services, this article investigates a new hybrid and integrated QoS control scheme that combines electrical IP layer features with reconfigurable optical layer, and addresses cross-layer design on QoS control in optical Internet (i.e., IP/WDM networks). The proposed integrated QoS control scheme can not only provide appropriate transport service for various types of traffic relating to different service categories in a cost-effective way, but also maintain high flexibility/scalability for integrated services provisioning, which seems to be preferred for QoS provisioning in the next-generation multiservice integrated optical Internet.     

IP-centric control and management of optical transport networks

Previous techniques for the management and control of optical transport networks are proving inadequate in today's rapidly evolving multivendor environments. This article examines the issues and challenges involved in developing a standardized optical network control plane. The control of optical transport networks is decomposed into provisioning models, a circuit provisioning process based on signaling, a neighbor and service discovery process, and a topology and resource discovery process. Unique properties and challenges of optical transport networks are explained in the context of these functions     

构造智能光互联网

现在的PC机只需要通过一个简单易用的接口接入互联网。网络将文本格式的URL转换为IP地址,网络中的路由器和服务器之间通过协商建立一系列的连接,然后传送所需的数据。用户根本不需要考虑带宽、接口、路由器或是通道。这种模型同样适用于骨干网络的带宽分配。这种模型我们称之为“智能光互联网”。在这个网络中,高速、高容量的路由器、传输系统、光交换机和软件可以随时根据用户的需求立即自动分配任意数量的带宽。观察当今家庭和企业中的局域网,我们就会发现,它们的工作方式基本上相同。这样我们没理由怀疑这种模型同样适用于核心网…     

Project management and the Internet

The author describes how exchanging information via the Internet is an attractive option when projects involve a range of different computer platforms and applications. However, he warns that being able to communicate in the management of a project should not be a solution in itself     

基于物联网的宿舍控制管理系统设计

文章设计了一种基于物联网的宿舍控制管理系统,包括主控模块、电流控制模块、水位控制模块、防盗模块、管理模块以及防火监测模块。其能够对宿舍的安全进行监测,提供远程监控以及命令和信息的交互,为宿舍提供更加方便和安全的控制管理服务。     

Recent Advances in Communication and Internet Technology

Telecommunication Systems -     

Network control and management challenges in opaque networks utilizing transparent optical switches

There is a potential for significant cost, footprint, and power savings by eliminating unnecessary opto-electronic conversions on a signal path in a core optical mesh network. The article addresses and clarifies some fundamental issues surrounding all-optical networking and all-optical switching, and analyzes the trade-offs between transparent and opaque networking. It investigates a number of networking and interface compatibility issues that arise for an opaque network with transparent switches, and presents a number of ways to address these issues.     

建设新型电信级光互联网

要实现从叠加网络向统一的多业务网络的过渡,运营商需要新一代的边缘路由平台　　随着ＩＰ业务的增长,通信业在高容量光网络上的投资持续高速增长。在光层上叠加ＳＯＮＥＴ再叠加ＡＴＭ再叠加ＩＰ的运行方式已不再是必需的了。取而代之的是ＩＰ ｏｖｅｒＳＯＮＥＴ,或者ＩＰ ｏｖｅｒ ＤＷＤＭ,因而消除了不必要的开销。在这种新型网络中（即光互联网）,多协议标签交换（ＭＰＬＳ）传送正在成为融各层于一层的既提高性能,又简化网络结构的传送方式。 ＤＷＤＭ和光交换的广泛实施提供了巨大的带宽,为光互联网的发展创造了巨大的契机。…     

基于物联网技术的智能能源管控系统的研究

为解决重装备产业园区内生产用能峰谷差大,能源利用率不高,无法准确预测园区供能和用能情况等问题,提出了一种基于物联网技术的智能能源管控系统,并给出了系统的体系结构和主要功能模块,阐述了各模块主要用途,设计出数据库E-R图。最终利用J2EE技术开发了产品工艺管理与优化、能源供应消耗量预测、在线监控、生产计划优化调度于一体的软件系统。     

Advances in phase-sensitive optical time-domain reflectometry

Phase-sensitive optical time-domain reflectometry (Φ-OTDR) has attracted numerous attention due to its superior per-formance in detecting the weak perturbations...     

Advances in optical time domain reflectometry

Advances in optical time-domain reflectometry (OTDR), such as enlargement of dynamic range, enhancement in resolution, reduction of noise intrinsic to single-mode fibers, and increase in user friendliness of the equipment, are reviewed. The gated detection technique and recent progress in OTDR are presented. Future optical network diagnostics are discussed     

Advances in control and management of connection-oriented networks: part 2 [guest editorial]

The three articles in this special section are devoted to advancements in the control and management of connection-oriented networks.     

A scalable design of multigranularity optical cross-connects for the next-generation optical Internet

This paper proposes a scalable design for next-generation optical cross-connects (OXCs). We present a novel strategy for dimensioning the switching capability as a long term planning. Switching fabrics in OXCs have to be expanded according to traffic growth, which may incur a scalability problem due to the exponentially increasing cost in manufacturing and maintenance. The proposed scheme expands the switching capacity of OXCs with waveband- and fiber-switching components (or, equivalently, expands the network capacity with waveband- and fiber-switching tiers). To minimize the number of extra fibers for waveband- and fiber-switching tiers required to satisfy a given traffic matrix, we formulate the problem of routing and wavelength assignment (RWA) with tunnel allocation (RWAT) into a constraint programming (CP) process. The CP is simplified as two integer linear programming (ILP) processes that are performed sequentially. Experiments are conducted on four examples to compare the throughput and the number of switching points when different switching architectures are adopted under different traffic increase. The benefits of our approach are demonstrated. Finally, we conclude that the proposed optimization scheme can dimension the networks with expandability and scalability to the growing traffic demand.     

灰盒光传输设备的SDN管控技术研究及应用

传统光传输网络正逐渐走向开放与解耦,“烟囱式”的单厂商单域管理模式也在软件定义网络（software defined network,SDN）理念渗透下向多厂商、多域统一管理模式发展,考虑到传输网络的设备差异性和协议复杂性,对传送SDN管控提出了一定的要求。首先,提出了介于黑盒设备与白盒设备之间的灰盒概念;然后,以灰盒化的接入型光传送网络（optical transport network,OTN）设备为例,探讨了接入型OTN的SDN统一管控关键技术,包括开放管控架构、业务模板化、拓扑自动生成、设备自动上线、设备远程升级等;最后,结合实践阐述了接入型OTN统一管控系统的实现和现网应用情况。     

光因特网互联模型研究与演进

光因特网是能提供高带宽的下一代因特网,对其互联模型的研究是目前光因特网研究中的一个热点.文章分析了互联模型由重叠模型向对等模型演进的基本趋势,并在对比固有的3种互联模型--对等模型、重叠模型及增强模型的基础上,提出了一种新的演化模型--混合模型,这种模型能够支持对等模型与重叠模型的共存,文章对其实现的原理与机制进行了论述.     

长距离布里渊光时域反射光纤传感技术进展

大型桥梁坍塌、建筑物倾斜、冰灾造成输电杆塔倒塌大范围停电等自然灾害新闻屡见不鲜,对类似这些设施的监测研究成为热点.布里渊光时域反射(BOTDR)光纤传感具有分布式温度/应变同时传感、单端注入与测量等优点而被人们广泛采用.本文针对长距离光纤传感应用场景,分析了BOTDR传感机理;综述了近20年以来10 km及以上长距离B...