锂电池维护仪的设计与实现

每隔半年对贮存的锂电池进行维护时,由于无专业的维护设备,耗费大量人力成本.针对这种情况,设计了具有锂电池维护、充电、放电、性能测试、电压测量等功能的锂电池维护仪,解决了锂电池维护过程中存在的不便.通过试验验证,锂电池维护仪操作简单,各项性能满足设计要求,实现了锂电池维护的自动化,提高了生产效率.     

计算机在民航通信设备维护工作上的应用

而在民航通信设备的维护工作中,计算机也起到了至关重要的作用,有利于维护的全面性、整体性、可靠性,也有利于维护过程中的自我检测和主动性的维护和预防。文章主要对计算机在民航通信设备维护工作中具体应用作出了分析,在对民航通信设备进行了解的基础上认识到了民航通信设备维护的重要意义和作用,也具体地分析了计算机在民航通信设备维护过程中的实际应用。     

500kV梅力更智能化变电站运行维护分析

介绍了500kV梅力更智能化变电站与传统变电站在结构、维护、异常处理等方面的不同,分析了智能变电站维护方面的转变,总结了智能变电站的运行维护方法,为梅力更变电站运行维护提供参考.     

DX系列发射机维护技术的分析与探讨

本文结合实践,通过分析DX发射机维护的要求、特点、难点,对维护项目、方法、周期以及预防性维护进行了探讨,寻求DX发射机新的维护方式和维护手段,以提高设备的安全运行效率。     

光进铜退设备应用中存在的问题及措施建议

邵阳电信制定了户外接入设备维护实施细则,该细则对户外设备维护的组织架构、职责范围、维护界面划分、维护质量管理及故障处理流程等方面作了详细的规范,使设备的日常维护管理能够做到各负其责,有章可循,有力推动了光进铜退工作顺利开展。     

非线性编辑网络系统的管理及维护

维护非编网络系统,使之能够安全、合理、高效的运转,一直为业内所关注。本文试图就非编网系统管理、维护相关问题进行一些探索和论述。本文日常管理维护工作划分为四部分：系统环境管理维护、统硬件管理维护、系统软件管理维护、素材管理维护并进行了详细的参数。     

4G移动通信基站维护的创新思路分析

文章阐述了基站的概念及当前基站维护的基本内容,提出了在4G移动基站维护中的应用RFID技术的策略、基站维护流程的科学管理制度、4G移动基站维护物联网的应用策略等维护措施。     

光传输网络网管集成维护系统应用分析

介绍了光传输网管集成维护系统解决方案,分析了其基本设计架构和通信结构,阐述了集成维护系统功能,实现光传输网络维护管理便捷、高效、智能化。     

基于在线稳定分析的电网模型一体化维护管理方案

电力的快速发展,迫切需要进行基于在线稳定分析电网模型一体化维护的研究。文中简单介绍了电网模型的维护现状及存在问题。重点研究不同时间、不同空间电网模型维护管理机制,研究广域、分布式的“源端维护、全局共享”的电网模型一体化维护管理技术,实现调度中心内部以及调度中心之间的统一电网模型维护与管理,最后阐述了该系统整体功能架构,并给出具体的功能设计方案。     

信息窗

广东电信运行维护工作会议在广东江门召开广东电信运行维护工作会议于２０００年３月２１～２３日在广东省江门市召开 ,广东省邮电管理局杨春亮副局长、梁锋副局长、陈嫦娟副局长 ,电信总局总工办主任范俊谱出席会议。会议对１９９９年广东电信运行维护工作进行了总结和考核表彰 ,并对２０００年广东电信运行维护工作做出了部署。广东省邮电管理局运行维护部主任王尽国主任在会上作题为《加强网络维护 ,提高运行效益》的工作报告。报告总结回顾了１９９９年广东电信运行维护工作 ,对２０００年广东电信运行维护工作任务作出安排 ,并提出了新…     

Reconfigurable free-space optical cores for storage area networks

The role of the optical storage area network is becoming increasingly important in computer network architectures, with the amount of information being presented and requested on the Internet ever increasing. One of the key questions is what is the role of, and how do we control, an optical switch core within a SAN to optimize its performance. In this article we review two potential optical switch technologies and assess their performance as a SAN optical switch core.     

A unified study of contention-resolution schemes in optical packet-switched networks

This paper presents a comprehensive study of contention-resolution schemes in a multiwavelength optical packet-switched network. This investigation aims to provide a unified study of a network of optical routers, which include contention resolution in wavelength, time, and space dimensions. Specifically, we show: 1) how to accommodate all three dimensions of contention resolution in an integrated optical router; 2) how the performance of the three dimensions compare with one another; and 3) how various combinational schemes can be designed and how they perform. With the representative architectures and network topologies studied in this paper, the simulation experiment results capture the characteristics of different contention-resolution schemes, and they quantify the upper-bound average offered transmitter load for these schemes. The combinational contention resolution schemes are shown to effectively resolve packet contention and achieve good network performance under light to intermediate load.     

Multi-bit rate passive double star system using time-unit packet

This paper proposes a new optical access network system; the multi-bit rate passive double star (multi-bit rate-PDS) system. The multi-bit rate-PDS system passes multi-bit rate data streams between the optical service unit (OSU) and the optical network unit (ONU) using the time-unit packet (TP). This simplifies the provision of user flexibility and provides very economical network services to users. We describe the architecture and frame structure of the multi-bit rate-PDS system, and elaborate the advantage of its user accommodation. Furthermore, we show how to decide the multiplexed bit rates in the multi-bit rate-PDS system and how to realize the receiver circuit for multi-bit rate data packet streams     

Adaptive Optical Network Unit for Point-to-Point and PON Systems Based on Gigabit Ethernet

This paper proposes an optical network unit (ONU) that works in point-to-point (P2P) optical access systems as well as passive optical network (PON) systems and so reduces the operational expenditure of optical access networks in the full FTTH era. First, we discuss its design and implementation; after clarifying the requirements for the adaptive ONU, we describe how it should work while focusing on Gigabit-Ethernet-based P2P and PON systems. Next, we study its feasibility through experiments on a prototype. Also, we provide some additional considerations regarding the implementation and future application of the adaptive ONU.     

光纤通信的三十年历程和跨世纪展望

本文先简述光纤通信自１９６６年发明以来三十年中发展的六个阶段性特征,然后分别叙述从电缆传输发展至光纤传输的经过,从点一点线路和点一多点发展至由许多结点和线路组成整体通信网的过程,指出光纤通信组网技术的重要性,说明光纤通信网从电话网和分组数据网发展至综合业务网和宽带网的趋向;最后解释光纤通信系统被称为“信息高速公路”基石的理由。     

长途光缆骨干传输网的规划与建设

讨论了长途光缆骨干传输网络规划与建设中涉及到的几个问题（包括网络结构及网络保护、光纤光缆、网络装备技术和网络管理等几个方面）；简单描述了网络新技术的应用前景；提出了如何实现从现有网络向未来全光网络的过渡。     

On joint protection/restoration in IP-centric DWDM based opticaltransport networks

Previous advances in WDM technology are now beginning to shift the focus more toward optical networking and network-level issues. Providing survivability at the optical layer is inherently attractive, but whether it makes practical sense, given similar mechanisms that are already available at the higher layers, poses serious challenges and raises many questions. Today's core network architecture model has functional overlap among its layers, contains outdated functionality, and is too slow to scale. If IP can be mapped directly onto the WDM layer, some of the unnecessary network layers can be eliminated, opening up new possibilities for developing a simple and integrated-protection/restoration scheme that can be coordinated at both the IP and WDM layers. This article presents an overview of existing optical protection/restoration schemes. Then we present a novel mesh-based hybrid optical protection scheme that utilizes multifiber physical links along with a hierarchical OXC structure. An overview of the envisioned IP-centric DWDM-based optical data network architecture is then presented. The basis of how to implement a more direct IP standard-based approach for closer and efficient IP-WDM integration is also discussed. Finally, we articulate a view of how to provide a joint protection/restoration scheme that is coordinated at both the IP and WDM layers     

智能光网络的路由技术

路由技术是智能光网络的核心技术之一,如何把IP路由技术运用到智能光网络中,以及如何利用路由技术提高智能光网络的生存性已成为研究热点.文中综述了光网络中路由技术的特点,分析了当今国内外智能光网络的部分路由算法,深入研究对比了它们各自的优缺点,以及对智能光网络生存性产生的影响,预测了智能光网络路由技术的未来发展趋势.     

Design of WDM PON With Tunable Lasers: The Upstream Scenario

Tunable lasers are potential upstream optical light generators for wavelength-division-multiplexing (WDM) passive optical network (PON), which is a promising solution for next-generation broad-band optical access. The wavelength provisioning flexibility of tunable lasers can increase the admissible traffic in the network as compared to wavelength-specific lasers. Generally, the broader the lasers' tuning ranges, the more the traffic can be admitted to the network. However, broad tuning range requires sophisticated technology, and probably high cost. To achieve the optimal tradeoff between the admissible traffic and the cost, we investigate the relationship between lasers' tuning ranges and the network's admissible traffic and then design WDM PON by selecting lasers with proper tuning ranges for the upstream data transmission. Specifically, we focus on addressing two issues under three scenarios. The two issues are: how to admit the largest traffic by properly selecting lasers, and how to admit given upstream traffic using lasers with tuning ranges as narrow as possible. The three scenarios are: full-range tunable and wavelength-specific lasers are available, limited-range tunable lasers are available, and the exact number of lasers with specific tuning ranges are given.      

Statistical analysis of crosstalk accumulation in WDM networks

Accumulation of inband crosstalk in all-optical networks is studied. By applying statistical methods, we have investigated how inband crosstalk accumulation influences the performance of optical networks of different configurations. Our study shows that there exists a delicate dependence between network topology and robustness with respect to accumulation of inband crosstalk. A method is proposed to design optical networks with optical paths satisfying a certain level of inband crosstalk performance