浅谈MSAP技术在广电运营商大客户专线业务中的应用

本文简述了广电运营商大客户专线业务接入网的现状,对MSAP技术、MSAP系统组网模型与设备类型、总体功能、技术优势和技术标准进行了简单的介绍,建议广电运营商可以采用MSAP技术对大客户专网接入网进行优化,以满足大客户专线业务的需求,为大客户专线用户提供高带宽、安全可靠的差异化网络服务。     

MSAP组网在通信领域中的技术应用研究

随着大客户专线接入需求的不断增多,传统的采用协议转换器进行点对点的接入方式,已经不能满足当前发展的需求,基于此推出了MSAP技术。MSAP向用户提供E1/V.35租用线和专线业务以及以太网专线业务。本文对MSAP的关键技术、互通情况进行了分析,并对几种重要的组网方式进行解析,突出组网优势和用户应用优势。     

MSAP在集团专线接入业务中的应用

通过对MSAP(Multi-Service Access Platform)产生背景、关键技术、相关标准及主流厂商的介绍,结合新形势下集团专线的业务需求特点,制定出电信运营商专线业务的建设解决方案。     

接入型OTN设备部署优势及应用建议

针对运营商本地网核心汇聚节点少,在面对专线业务快速开通需求时存在单个汇聚节点覆盖面积过大、无法快速实现业务接入汇聚,以及多业务接入平台(MSAP)设备难以满足带宽迅猛增长的专线业务需求等问题,结合接入型光传送网(OTN)的设备特点和专线业务需求等因素,总结了接入型OTN设备的能力和成本优势,提出了可行的接入型OTN设备...     

MSAP技术应用研究

主要针对目前主流的大客户专线接入技术进行分析及探讨，分析传统大客户专线接八方式及MSAP平台对大客户专线接入网的优化及应用前景、阐述MSAP业务接入平台的技术原理及应用。     

MSAP技术在大客户专网中的应用探索

随着大客户专线大颗粒带宽业务需求的不断增多,传统的采用协议转换器进行点对点的接入方式已经远远不能满足发展的需求,主要表现在:设备类型众多、管理复杂、线缆连接复杂、占用空间大、网络管理差、带宽升级困难等问题,给运维工作带来巨大难度。而随着MSAP技术的推出,大客户专线业务的解决方案变得非常容易,可以向客户提供E1/V.35租用线和专线业务以及以太网专线业务等。     

集团客户专线业务接入组网技术应用研究

本文从集团客户专线业务网络支撑工作经验出发,分析集团客户互联网、话音、数据和APN专线业务的业务需求特点以及组网模式,总结SDH、MSTP/PTN、PON、MSAP以及成对光调制解调器、光纤收发器等主流接入技术的优劣点,给出各种接入技术适用的集团客户、集团业务以及业务场景,为专线业务组网提供指导。     

浅谈MSAP应用及技术演进

MSAP多业务接入平台(Multi-Service Access Platform)主要是定位于SDH传输网接入层的技术,融合了现有的SDH、MSTP、PDH、以太网等各种技术,能够在统一的平台上提供TDM和以太网业务的接入、汇聚和传输,从而快速低成本实现运营商的大客户接入等各种应用场景,可提供E1/V.35租用线和专线业务以及以太网专线业务,并且提供统一的网管平台。MSAP技术标准现状目前,国际上没有相关组织对MSAP的技术规范标准进行研究,发布相关的技术标准。在国内中国通信标     

浅谈MSAP技术在电信运营商中的应用

随着电信运营商的大客户业务的不断增多,其对电信运营商所提供的专线大颗粒带宽业务需求的不断增多,传统的采用SDH/PDH接入方式,2M接入已经远远不能满足发展的需求,主要表现在:管理复杂、设备类型众多、网络管理差、线缆连接复杂、占用空间大、带宽升级困难等,给电信运维工作带来巨大难度,也成为电信大客户业务发展的瓶颈。MSAP技术的推出,给电信大客户专线业务组网业务提供了灵活的解决方案,它可以向电信大客户提供E1/V.35租用线、专线业务以及以太网专线业务等多种业务接入,满足多样的客户组网需求。     

以太专线网络建设模式和选择策略研究

从以太专线网络建设模式及演进出发,结合PTN、PON、MPLSVPN等新技术的发展,探讨全业务运营环境下运营商开展大客户以太专线网络建设的新模式,通过新模式与传统MSTP、MSAP、PDH三种接入方式在可靠性、可管理性、可持续发展性及建设运行成本方面的分析,提出针对不同客户需求的选择策略建议,最后对我国当前以太专线网络建设需注意的问题给出简要结论。     

Alternative Schemes for Dynamic Secure VPN Deployment in UMTS

Three alternative schemes for secure Virtual Private Network (VPN) deployment over the Universal Mobile Telecommunication System (UMTS) are proposed and analyzed. The proposed schemes enable a mobile node to voluntarily establish an IPsec-based secure channel to a private network. The alternative schemes differ in the location where the IPsec functionality is placed within the UMTS network architecture (mobile node, access network, and UMTS network border), depending on the employed security model, and whether data in transit are ever in clear-text, or available to be tapped by outsiders. The provided levels of privacy in the deployed VPN schemes, as well as the employed authentication models are examined. An analysis in terms of cost, complexity, and performance overhead that each method imposes to the underlying network architecture, as well as to the mobile devices is presented. The level of system reliability and scalability in granting security services is presented. The VPN management, usability, and trusted relations, as well as their behavior when a mobile user moves are analyzed. The use of special applications that require access to encapsulated data traffic is explored. Finally, an overall comparison of the proposed schemes from the security and operation point of view summarizes their relative performance. Christos Xenakis received his B.Sc. degree in computer science in 1993 and his M.Sc. degree in telecommunication and computer networks in 1996, both from the Department of Informatics and Telecommunications, University of Athens, Greece. In 2004 he received his Ph.D. from the University of Athens (Department of Informatics and Telecommunications). From 1998–2000 was with the Greek telecoms system development firm Teletel S.A., where was involved in the design and development of advanced telecommunications subsystems for ISDN, ATM, GSM, and GPRS. Since 1996 he has been a member of the Communication Networks Laboratory of the University of Athens. He has participated in numerous projects realized in the context of EU Programs (ACTS, ESPRIT, IST). His research interests are in the field of mobile/wireless networks, security and distributed network management. He is the author of over 15 papers in the above areas. Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Greece, in 1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and 1984, respectively. From 1983 to 1986, he was on the faculty of Electrical Engineering and Computer Science at the University of Connecticut, Storrs. From 1986 to 1994 he was on the faculty of the Electrical and Computer Engineering Department at Northeastern University, Boston, MA. During the period 1993–1994 he served as Director of the Communications and Digital Processing Research Center at Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks Laboratory (UoA-CNL) and the Networks Operations and Management Center. His research interests are in the design and performance analysis of broadband networks, and wireless/mobile communication systems and services. He has authored more than 150 papers in the above areas. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in the framework of the Advanced Communication Technologies & Services (ACTS) and Information Society Technologies (IST) programmes funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE). He is chairman of the board of the Greek Universities Network, the Greek Schools Network, and member of the board of the Greek Research Network. In 1994, he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications.     

企业VPN技术应用实施浅析

随着企业规模逐渐扩大,远程用户、分支机构、合作伙伴也在不断增多,关键业务的需求增加,出现了一种通过公共网络（如Internet）来建立自己的专用网络的技术,这种技术就是虚拟专用网（简称VPN）。本文首先介绍了VPN的概念,对VPN的实现技术进行了分类和适用性分析,然后分析了各种类型的企业在信息安全方面的需求和限制,根据不同企业的特点提出了不同的VPN解决方案,最后,对VPN在集成电路企业中的应用做了简单的拓朴展示。     

接入控制器安全网络管理系统的设计与实现

在讨论了接入控制器(AC)网络管理系统安全重要性的基础上,分析了SNMP协议的应用,包括对其3个版本SNMPv1、SNMPv2及SNMPv3的优缺点的对比,并解释了该设备网络管理系统采用SNMPv3版本的原因.详细介绍了AC所实现的管理信息库的内容,包括RFC1213协议、IEEE 802.1x协议、RMON协议、Web DHCP、EAP_OTP、EAP_MD5、EAP_TLS、EAP_SIM等多种认证协议以及网络管理系统的五大功能.最后阐述了AC安全网络管理系统结构的设计与实现.     

SOI Technologies Overview for Low-Power Low-Voltage Radio-Frequency Applications

Thanks to their structure, the SOI technologies present several intrinsic advantages for analog and RF applications. Indeed, as it is well established now, these technologies allow the reduction of the power consumption at a given operating frequency. Moreover, the high-insulating properties of SOI substrates, in particular when high resistivity substrate is used, make that these technologies are perfect candidates for mixed-signal applications. In the present paper, we will discuss the performances of the SOI technologies in radio-frequency range. First of all, the high-frequency behavior of SOI substrates, thanks to the characterization of transmission lines, will be shown. The impact of the SOI substrate resistivity on the performances of passive components will also be analyzed. Then, an overview of RF performances of SOI MOSFETs for two different architectures, fully- and partially-depleted, will be achieved and compared to the bulk ones. Finally, the influence of some specific parasitic effects, such as the kink effect, the self-heating effect and the kink-related excess noise, on the RF performances of SOI devices will be studied, thanks to a specific high-frequency characterization.     

自动测试系统中的总线技术

自动测试系统满足现代科研生产中对测试高速度和高精度的要求,其发展方向是标准化、模块化和系列化,而标准的总线技术是满足这三化的关键技术,总线技术作为自动测试系统的核心,其发展推动了自动测试系统的更新换代.按照自动测试系统中出现的总线技术的顺序,依次对GPIB,VXI,PXI,LXI的基本特性、优缺点及应用进行概括,重点是结合在实际中组建自动测试系统对总线的选型,从宏观上比较了选取传统的卡式仪器总线或基于以太网的新型总线的因素.从而使用户在选取总线时更有针对性和目的性.     

雷达探鸟技术发展与应用综述

探鸟雷达已成为机场鸟击防范、风力发电场鸟击风险评估、鸟类自然保护区鸟情观测与科学研究的重要工具。文中首先论述了探鸟雷达的主要组成部分。然后,分析了地面杂波、空域杂波和其他无关目标对探鸟雷达探测效果的影响,进而介绍了传统的杂波抑制方法和相参雷达杂波抑制技术,以及先进的探鸟雷达采用的目标检测、目标跟踪、目标显示、数据记录和雷达组网等数据处理技术。接着,给出了当前的探鸟雷达能够获取的目标轨迹、回波大小、回波强度、信号波动、飞行速度、飞行高度等反映飞鸟目标特性的主要指标。最后,描述了国内外四种典型雷达探鸟系统,并针对雷达探鸟技术的未来发展提出了一些思考及可行性建议。     

CPLD在雷达发射机控制检测单元中的应用

随着雷达发射机技术的不断发展,越来越多的新技术应用于发射机设计中。复杂可编程逻辑器件CPLD和现场可编程门阵列FPGA,同以往的PAL和GAL器件相比,这些器件含有数量众多的可编程逻辑宏单元或逻辑块,规模大,组合能力强,设计成功能各异的逻辑电路,适合于时序、组合等逻辑电路。本文用CPLD对发射机控制功能进行综合处理,控制命令产生部分根据信号处理机通过串行链发来的控制命令产生控制命令,然后对发射机进行相应的控制,并对相关命令根据时序和故障情况进行逻辑链锁,达到最终控制发射机的目的。     

事件科普营销模式探究

从事件的视角看科普,已形成了社会公共事件、社会热点事件、社会突发事件等社会事件中嵌入科普的应急科普模式。但从科普的视角看事件,应急科普模式只是依托事件展开科普的组成部分,结合事件营销和科普营销的已有研究基础,本文提出事件科普营销模式,界定其依借公益性、聚焦性和危机性事件的内涵和依附性、新闻性、策划性三个特征,并从科学技术渗透疆常生活、资源整合、投入产出效率等角度论述其兴起的内在依据,并提出借势方式和造势方式下的四种路径。     

关于物流机器人配送在社区疫情隔离中的应用探讨

机器人系统通常用于人工介入成本过高、危险过大或者效率过低的任务。近年来,随着人工智能、自动驾驶、物联网等众多相关学科的全面发展,机器人在很多行业的应用也越来越广泛、成熟;与民众生活密切相关的物流机器人的配送应用也在逐步发展;互联网下,电商的充分发展为物流机器人的配送应用提供了明确的应用场景。而在抗击新型冠状病毒肺炎疫情时期,区域人群需要实行严格隔离,隔断病毒人传人的感染途径。针对这样的状况,物流机器人可发挥其巨大优势,为民众提供物资配送服务,可有效隔断病毒人际传播,避免人员配送过程中可能带来的病毒扩散风险,针对性地解决疫情隔离阶段物资供给最后一里的难题。     

基于高斯分布的基站天线最佳方向角定位算法

为提高天馈问题被发现的准确性和维护效率,提出了基于高斯分布的最佳方向角解决方案来诊断运营商天馈覆盖问题。首先计算 UE 上报的具有定位信息的每个 MR 采样点与基站之间的位置方向信息,然后按照位置方向的一定角度间隔逐个统计各区间的MR采样点占比,取MR采样点占比最大的角度区间为该扇区的、基于用户热点分布的最佳天线方向角,最后将该最佳方向角与后台天线基础数据库中基站方向角进行比对,发现天馈系统接反、天线覆盖方向不合理、后台天线数据库错误等一系列天馈相关问题。经验证,采用该算法发现天馈问题的成本、准确率和效率较现有方法有明显改善?。