基于SpaceFibre光网络的即插即用技术及性能分析

SpaceFibre光总线广泛应用于航天领域。SpaceFibre光网络即插即用(SpFi-PnP)技术便于星载设备的在轨管理,能实现星载网络的可测可控。在大型星载总线网络中,采用宽度遍历算法发现网络设备,通过设计SpaceFibre光网络的网络管理器,实现了总线网络的即插即用。实验证明,网络管理器能稳定发现设备信息并监控路由器网络中节点设备的实时状态,通过OPNET仿真建模分析基于SpaceFibre总线协议的光网络端到端延时来评估在网络中使用宽度遍历算法的网络性能,并在源模块节点采用整包和分包两种机制发送数据流。结果表明分包机制效果更佳,探究得到分包组数为10时网络延时性能最优。     

基于SNMP的光纤放大器远程监控系统设计

为了管理光纤放大器的各项数据指标,基于简单网络管理协议(SNMP)设计了一种远程监控系统.该系统管理端采用SNMP<'++>开发包为用户提供了友好的管理界面,代理端使用MSP430单片机和CS8900A网卡驱动芯片作为网络通信的硬件支持.建立了光纤放大器的各项数据指标管理信息库文件的私有节点.结果表明,系统通过与实际光...     

自动交换光网络域间网络管理系统模型设计

从网络管理的角度出发,提出自动交换光网络基于网络层次的网络管理实现方案。针对目前光网络多区域、异构的特点,在ITU-T已有的网络信息模型的基础上,做出扩展,提出适合域间网络管理的信息模型,实现跨区域的网络管理;同时提出适合ASON特色的三种连接的管理信息模型,实现跨区域网络端到端的连接管理;最后,给出了基于CORBA技术的域间网络管理系统实现方案。     

北电网络推出OPTera Connect HDX新一代光交换机

北电网络近日宣布在中国正式推出OPTera ConnectHDX新一代光传输交换机。这一业界领先的新一代多太比特级光传输节点设备,通过先进的软件技术实现智能化的大容量端到端的传输带宽管理,可望帮助中国的电信运营商实现高效网络管理,赢取竞争优势。OPTeraConnect HDX是一种多太比特级的智能光传输节点设备,它通过北电网络Preside网络管理系统实现智能化的大容量端到端的智能光交换,能够提供空前的网络扩展能     

北电网络推出OPTeraConnectHDX新一代光交换机

近日 ,北电网络宣布在中国正式推出ＯＰＴｅｒａＣｏｎｎｅｃｔＨＤＸ新一代光传输交换机。这一业界领先的新一代多太比特级光传输节点设备通过先进的软件技术实现智能化的大容量端到端的传输带宽管理 ,可户帮助中国的电信运营商实现高效网络管理 ,赢取竞争优势。作为构建下一代全光网的关键平台 ,ＯＰＴｅｒａＣｏｎｎｅｃｔＨＤＸ是一种多太比特级性能的光传输节点设备 ,它通过北电网络Ｐｒｅ ｓｉｄｅ网络管理系统实现智能化的大容量端到端的智能光交换。ＯＰＴｅｒａＣｏｎｎｅｃｔＨＤＸ能够提供空前的网络扩展能力和业务处理能力 ,带…     

基于OPS技术的超高速光孤子通信实现方案

通过对光分组交换(OPS)技术的讨论,实现了多交换节点的超高速光孤子通信传输方案.在详细阐述光孤子通信系统中光分组形式和OPS节点结构的基础上,进一步分析了传输方案实现的可行性,最后对该技术的优劣进行分析.指出,基于OPS技术的光孤子通信是实现未来全光网的首选.     

P2P网络管理系统信息模型的设计与实现

为满足基于P2P的网络管理体系结构中管理节点间的协作需求,提出了一种基于语义Web服务和XML的网络管理信息模型.利用P2P通信和语义Web服务,可实现网管服务的分布式注册,服务的统一描述和基于能力的服务检索;利用XML来制订网络管理服务调用的标准,可以实现服务的跨域自动调用.原型实现和运行测试表明,利用提出的模型框架,异构网络管理系统可以通过节点间的服务调用和信息共享实现管理任务的协作.     

高速光交换机竞争解决机制研究

在光分组交换网络中,当同一时刻有两个或两个以上的分组以同一波长从同一端口离开光交换节点时就会出现分组竞争,采用不同的竞争解决方法对光分组交换网络性能会产生巨大影响.在光分组交换中解决竞争主要有光缓存、波长变换、偏射路由三种方式.详细阐述了这三种竞争解决方法的原理、实现方式及特点,并对今后发展趋势做出展望.     

光传送网中的信令网

从光网络管理和控制机制的演变和发展提出了光信令网的概念,分析了光信令网链路及 节点的实现方式和MPλS网络中的信令机制,并着重阐述了通用光信令网(GMPLS)。     

ForCES体系结构中支持SNMP 的FE代理端的研究和实现

网络管理系统由网管站、管理代理、管理信息数据库和网络管理协议构成.简单网络管理协议（SNMP）包括管理信息结构（SMI）、管理信息库（MIB）和SNMP 三部分.首先介绍了ForCES体系结构、ForCES最新进展和SNMP简单网络管理协议,然后提出了一种ForCES支持SNMP的方案,并指出了ForCES结构下的路由器在实现网络管理上的主要问题和困难,最后给出了如何利用网络管理软件开发ForCES模型中FE端SNMP代理的具体方法.     

光分组交换节点技术

文章首先介绍了光分组交换网络的分类和光分组交换节点的基本结构,接着详细讨论了全光分组交换节点设计和实现中的关键问题:交换结构的设计、光存储的实现以及分组拥塞问题的解决方案。     

光突发交换控制卡电路的设计与实现

光突发交换(OBS)是兼顾光电路交换和光分组交换优点的一种折衷方案，是未来光互联网的一种实现形式。在我们即将组建的光突发交换试验网中，IP(因特网协议)数据在边缘节点被组装成突发包，需要使用数据卡和控制卡分别处理数据分组和控制分组。因此，对处理控制分组的控制卡电路的优化设计和实现进行了描述。     

Realization of large capacity ATM switches

Large-capacity ATM switches, with switching capacity in excess of 40 Gb/s or 100 Gb/s, are becoming an essential part of network growth. To realize such switches requires technology know-how as well as implementation trade-off considerations. This article provides a system-level exploration of large-capacity ATM switches in terms of switch fabric scalability, cell buffer management, buffer design trade-off, call processing capabilities, and future trends in switch design     

Building reusable mobile agents for network management

Mobile agents can migrate among nodes to perform a set of management tasks at each of the visited nodes. Existing mobile agent-based network management systems often assume that their mobile agents are designed to work in particular networks to raise the efficiency of agent migration among multiple nodes. Unfortunately, such mobile agents cannot be reused in different networks. This paper proposes a framework where a mobile agent for network management is composed of two kinds of software components, an itinerary part and a behavioral logic part. Both components are implemented as mobile agents. The former is a carrier designed for particular networks, and it can efficiently navigate other mobile agents among nodes in its target network. The latter defines management tasks performed at each node independently of any local network. This framework allows a mobile agent for network management to be reused in various networks without being modified. A prototype implementation of this framework and its application were built on a Java-based mobile agent system.     

钢铁企业销售物流节点管理及软件实现

本文结合钢铁企业销售物流实际的运营情况,分析钢铁企业销售物流节点管理方面的信息需求,主张在客服管理系统中增加物流节点基本信息管理及走访计划功能。在软件实现方面,主张采用SSH架构,这种架构将Struts、Spring、Hibernate有机地结合起来,Struts对MVC设计模式提供了对应的组件,Spring解决了企业应用开发的复杂性,Hibernate实现了数据持久化。在数据库分析和设计的基础上,给出了页面设计,探讨了具体的实现过程和关键技术。     

Photonic access concentrator for ATM gigabit switching fabrics

In future broadband communication networks the interest for purely photonic switches is due to the bandwidth mismatch between optical transmission networks and electronic switching nodes. Photonic ATM switching fabrics mainly based on wavelength-switching stages are therefore being studied, to implement high capacity switches with also concentration, multiplexing and demultiplexing functions, using state-of-the-art photonic technology. The architecture of an ATM photonic access concentrator is described in this paper, illustrating the design and implementation of its basic subsystems, the traffic concentrator and the cell multiplexer. The design guidelines are outlined in detail referring to an example, where 128 user lines at 622 Mb/s are given access to 4 outlets at 2.488 Gb/s. The corresponding implementation, based on the systematic use of cell wavelength encoding, makes use either of well-known photonic components, such as Fabry-Perot filters, fiber delay lines, splitters and combiners, either of recently developed devices, like high-speed optical gates and tunable filters and lasers. Finally, the system feasibility is demonstrated presenting the results obtained on a reduced size and speed experimental setup of the cell multiplexer     

Practical implementation and packaging technologies for alarge-scale ATM switching system

The practical implementation of a trial large-scale asynchronous transfer mode (ATM) switching system and its packaging technologies are described. The architecture of the ATM switching system is discussed with an emphasis on system scalability. A building block architecture in which switching capacity can be expanded in a modular fashion is introduced. The design of the ATM switching system, including the ATM switch element, is described. The implementation of the VLSIs for the ATM switch which realize a highly modular system is explained. Bit-slice techniques are effectively used to realize a high-speed switch element as a CMOS VLSI chipset. An edge-to-edge orthogonal packaging technique is also presented     

基于XML—RPC的海量存储管理系统的设计与实现

海量存储系统是由管理节点、数据节点通过高速交换网络互联形成的分布式存储系统。它支持CIFS、NFS、WebDAV等多种访问协议,具有高性能、高可用、高扩展等特性,是设计和实现管理系统时面临的挑战。为了实现基于Web的管理系统,针对该系统的分布式结构和丰富特性,本文提出了基于AJAX和XML—RPC技术的海量存储管理系统架构,并描述了其管理系统的主要组成部分和工作过程。     

Switching System Software Design for ISDN

The ISDN offers various services through multipurpose digital subscriber lines. The switching program for the ISDN should be so designed as to realize the control of various voice and nonvoice services and provide for developing service enhancement. To attain the goal, the ISDN services are classified hierarchically and each category is allocated to appropriate network nodes for implementation. As a result, the local switching program provides an out-slot subscriber line signaling capability and call connection with appropriate compatibility checking including a check for access capability to communications processing nodes. The switching program modules specific to analog services and those specific to digital services are separated to allow the use of the existing program file and to afford easy program design and maintenance. Remote-controlled switching is a suitable means for an economical introduction of the ISDN services to low traffic density areas. Special routing and reliability arrangements as well as the program structure for a remote-controlled switch are discussed.     

Modular design and improvement of the management system in the smart home with the use of interval multiset estimates

The paper addresses modular design and improvement/extension of the management system in the smart home and the building automation system (BAS). The design procedure is based on the hierarchical morphological multicriteria design (HMMD) approach: (a) construction of a tree-like system model, (b) generation of design alternatives for leaf nodes of the system model, (c) the bottom-up process: (i) selection of design alternatives for system parts/components and (ii) composition of the selected alternatives into a resultant combination. Here, the HMMD approach with interval multiset estimates for design alternatives is used. The system improvement scheme is based on the following: (a) upgrade of the system components (strategy 1), (b) system extension by adding an additional part (strategy 2). The multiple choice problem with interval multiset estimates for improvement operations is used in system improvement procedure. Two basic applied illustrative numerical examples are considered: (1) a modular management system for the smart home and (2) a modular building automation system consisting of four parts.