ZXNetMan—完整的网络运营维护方案

ＺＸＮｅｔＭａｎ网管及集中监控系统是集ＺＸＪ１０交换机的集中操作维护，网络管理，集中计费，通信机房环境监控以及动力设备监控为一体的功能完善的应用系统，为电信运营部门的运营和维护提供了一个面向未来发展的解决方案。     

应用于移动通信的动力环境集中监控系统

随着我国移动通信事业的发展，移动通信网络规模越来越大，移动通信动力设备和机房环境的维护难度和工作量也相应增加。目前，各省市移动公司都在加快动力环境集中监控系统的建设，并逐步建立起一套以动力环境集中监控系统为平台的动力设备和环境的维护管理体系。江苏移动公司在动力环境集中监控系统的建设方面起步较早并积极加强了系统的应用研究工作。本阐述了目前移动通信动力设备和环境维护管理工作所面临一些的问题，并重点对动力环境集中监控系统在移动通信网维护管理工作中的应用进行了探讨。     

移动基站动力监控系统的开发和应用

移动通信网中有大量的移动基站 ,每个基站都必须配备电源设备 ,保证基站电源设备良好工作是通信网络正常运行的关键之一 ,但目前的维护水平仍停留在传统的人工看管、巡检等方式上 ,还远远跟不上高速发展的移动通信业务的需求。由于移动网络自身的特点 ,目前应用于固定网的动力及环境集中监控系统不能很好地应用于移动通信网中 ,因此移动基站动力监控系统的开发势在必行。近两年 ,我们一直致力于移动交换局和移动基站动力设备及环境集中监控的开发 ,并联合北京邮电大学的科研人员在东莞、南海等市的移动局进行了动力及环境集中监控系统的应用…     

通信机房动力设备及环境集中监控系统节能降耗应用研究

文中首先简要介绍了通信机房动力设备及环境集中监控系统的网络结构组成和系统功能，进而提出利用动力设备及环境集中监控系统进行节能降耗应用，最后阐述动力设备及环境集中监控系统节能意义。     

动环监控系统与EOMS接口实现动环告警工单自动派发

加快支撑手段建设,实现集中管理、集中维护、集中监控是中国移动的5项网络重点工作之一,动环监控系统是配套设备实现"三集中"的唯一支撑手段,配套设备分布在所有机房和基站,点多面广,现场维护工作量大,省中心如何快速把配套设备告警信息传递给设备维护人员,我们通过把动环监控系统与EOMS系统接口,使动力设备及局房环境告警工单自动派发给设备维护人员,实现了全省配套设备的"三集中".     

移动基站及直放站集中监控系统方案的研讨

本文对当前国内较为流行的移动基站及直放站动力设备及环境集中监控系统的原理，功率等进行较详尽的分析，同时山西移动通信公司引入该系统的方案提出了自己的见解。     

动力设备及环境集中监控系统的关键设备及典型产品

本文论述了国内动力设备及环境集中监控系统的发展概况及关键设备，并介绍了中兴通讯ＺＸＭ１０动力设备及环境集中监控系统。     

探索新的维护体制下的动力维护管理新路子——充分发挥动力设备及环境集中监控的作用

探讨动力设备及环境集中监控在动力维护管理中的作用,以及维护体制改革后动力维护管理的模式和做法。     

深圳华为PSMS动力设备及环境集中监控系统

深圳华为ＰＳＭＳ动力设备及环境集中监控系统华为通信股份有限公司从１９９５年开始从事集中监控系统的开发设计，经过不断地积累，现在已经拥有监控研究开发、工程设计、技术维护的专业技术人员近２００人，具有独立自主研究开发、工程设计、技术维护、推广服务的强劲实...     

探索新的维护体制下的动力维护管理新路子——充分发挥动力设备及环境集中监

探讨动力设备及环境集中监控在动力维护管理中的作用,以及维护体制改革后动力维护管理的模式和做法。     

Dynamic operation and maintenance systems for switching networks

Some important concepts and techniques related to dynamic operation and maintenance (O&M) systems for switching networks are demonstrated. Five types of node that comprise the dynamic network O&M system being developed by the authors are discussed. They are local exchanges, a centralized operation system, a database system, a diagnostics expert system, and maintenance workstations. The nodes are implemented on an efficient distributed system and use a standardized interface. This O&M system, which is geared toward improved maintenance, focuses on the switching network as a whole, rather than on individual exchanges. In the case of alarms and fault messages, O&M takes corrective action automatically     

集中化、信息化、区域化--转型期移动网络运维的发展方向

随着3G时代的到来，移动网络将步入重大的转型期。本文通过对河北移动网络运维的实例分析说明，集中化是移动网络发展的要求，信息化支撑了集中化的实施，区域化是县区保证网络运维、支撑市场发展的有效途径。文中最后对集中化、信息化、区域化的运维发展趋势做了展望。     

构建ADSL宽带数据网络综合运营维护系统

分析了目前ADSL宽带数据网络运营维护所面临的问题，提出了构建ADSL宽带数据网络综合运营维护系统的解决方案。     

现代电信网运行维护的技术支持系统

在电信网达到一定规模，网路建设速度放慢之时，在设备 应商的名费技术支持到期后，数千万端口多种型号的交换设备和大量传输设备的技术支持由谁来承担？中国电信将采用什么策略 技术手段来保障维护部门能及时得到优质高效的技术支持？本文作者长期从事本地网网管和集中监控系统的开发和工程实施，深深感到与网管配套的运行维护技术支持系统在电信支撑网的建设中的重要性。     

MOS Characteristics of C-Face 4H-SiC

Metal–oxide–semiconductor (MOS) capacitors and MOS field-effect transistors (MOSFETs) fabricated on the carbon face of 4H-SiC were characterized following different postoxidation annealing methods used to passivate the oxide–semiconductor (O–S) interface. Of the various processes studied, sequential postoxidation annealing in NO followed by atomic hydrogen gave the lowest interface trap density (D _it). Direct oxidation/passivation in NO yielded somewhat better I–V characteristics, though all passivation ambients produced approximately the same breakdown field strength. n-Channel MOSFETs showed high channel mobility at low field, which is likely caused by the presence of mobile ions at the O–S interface. Comparisons with the silicon face are presented for interface trap density, oxide breakdown field, and channel mobility. These comparisons suggest that the carbon face does not offer significant performance advantages.     

GSM网长盛不衰引发的思考

分析了GSM在全球获得巨大成功的原因，揭示了GMS在业务承载、研发支撑、运维支持以及与3G互通等方面所面临的挑战。     

Operation and maintenance field experience for off‐grid residential photovoltaic systems

The field performance of photovoltaic systems has been studied extensively for many applications and a number of databases exist in the United States and internationally. However, these databases focus almost exclusively on the system elecrical performance. Published information on the operation and maintenance (O&M) experience and costs for photovoltaic systems is almost nonexistent. At a time when photovoltaics is being considered as a viable option for distributed energy generation, it is critical that maintenance experience be captured to identify lifecycle costs and/or levelized energy costs for these systems, as well as to identify areas for system and component improvements. This paper addresses the data collection, analysis and results of an off‐grid residential customer service program offered by the Arizona Public Service (APS) Company over a six‐year period from 1997 through 2002. Standardized, packaged photovoltaic systems were offered and operated by APS through a lease arrangement with customers throughout the state of Arizona. The operation and maintenance records for these systems were carefully tracked and analyzed. The O&M costs, database development, cost drivers, lifecycle cost implications, and lessons learned are presented and discussed. Copyright © 2004 John Wiley & Sons, Ltd.     

中兴宽带线路测试技术及功能介绍

宽带线路测试是中兴通讯ZXDSL综合宽带运维系统的核心功能，在DSL业务提供过程中主要应用在开通前的预测试、线路测试、开通后的例测试以及故障时的在线测试。对其测试技术和功能作了介绍。     

Solar based large scale power plants: what is the best option?

There are very few published data comparing performance and cost of thermal and photovoltaic (PV) based solar power generations. With recent intense technology and business developments there is a need to establish a comparison between these two solar energy options. We have developed a simple model to compare electricity cost using these two options without any additional fuel source of hybridization. Capital along with operation and maintenance (O&M) costs and other parameters from existing large scale solar farms are used to reflect actual project costs. To compete with traditional sources of power generation, solar technologies need to provide dispatchable electric power to respond to demand during peak hours. Different solutions for energy storage are available. In spite of their high capital cost, adding energy storage is considered a better long term solution than hybrid solar systems for large scale power plants. For this reason, a comparison between the two solar options is also provided that include energy storage. Although electricity storage is more expensive than thermal storage, PV power remains a competitive option. Expenses related to O&M in solar thermal plant are about ten times higher than PV, an important factor resulting in higher energy cost. Based on data from proven commercial technologies, this study showed that PV holds a slight advantage even when energy storage is included. Copyright © 2010 Crown in the right of Canada. Published by John Wiley & Sons, Ltd.     

Service Discovery in Ad Hoc Networks: Performance Evaluation and QoS Enhancement

With the increasing popularity of wireless portable devices, such as laptops, PDAs and mobile phones, it is getting more and more important for mobile users to discover their required resources (e.g. printers and fax machines) without any need of configurations. To this end, automatic service discovery is an important feature of mobile Ad Hoc networks (Manets). In this paper a service discovery protocol for Manets based on the IETF Service Location Protocol has been implemented in the NS-2 simulator. Its performance is studied under different mobility patterns, network sizes and number of service agents. A lightweight quality of service (QoS) aware service discovery protocol is also proposed to support QoS applications. Zhong Fan is currently a Principal Researcher with Toshiba Research Europe in Bristol, UK. He received the B.S. and M.S. degrees in Electronic Engineering from Tsinghua University, China and the Ph.D. degree in Telecommunication Networks from Durham University, UK. His research interests are protocol design and performance analysis of wireless networks.