PTN网络对承载业务的影响分析

文章首先介绍了PTN网络的QoS指标,然后针对现网承载的主要业务——TDM基站业务、IP化3G基站业务和以太专线业务,对采用PTN网络进行承载造成的影响进行了深入分析。     

为ATM业务插上翅膀——如何为企业专线用户提供高品质以太网接入

虽然基于IP的分组网络越来越普及。但是ATM作为一种成熟的技术仍然在企业专线应用中发挥着重要作用。但是,由于用户应用需求的增加,传统的2M专线已经不能充分满足用户对带宽的需求,越来越多的用户开始选择以太网专线。随着以太网专线应用的兴起,如何更好地将以太网与ATM结合应用,成为运营商需要解决的一个课题。北电网络(中国)有限公司的刘忠信所撰《为ATM业务插上翅膀——如何为企业专线用户提供高品质以太网接入》一文中分析了传统的以太网交换机与ATM交换机结合使用的缺点,介绍了北电网络的光以太网接入环解决方案,该方案通过大范围、高密度以太环网,将城城内的企业用户以传输级的高可靠性(＜50ms的故障切换)收集起来。为ATM多业务平台提供了一片新的业务扩展空间；解决了传统以太网交换机作为ATM业务收集的诸多不足。对拥有ATM网络的运营商来说,这可以作为一种即保护现有投资,又能发展新兴的以太网专线应用的一种选择方案。     

构建大客户以太网专线传输平台

文章分析了大客户以太网专线业务需求,根据当前传输网络现状,提出了构建大客户以太网专线传输平台的解决方案,指出了建设基于多业务光纤传输平台(MSTP)的大客户以太网专线传输平台时应注意的问题。     

多业务传输平台技术综述

本文从多业务传输平台(MSTP)的关键技术,MSTP提供的专线业务简介,MSTP在城域网建设中的应用, MSTP在3G传输网络建设中的应用,MSTP技术演进趋势以及MSTP目前发展概况等方面,详细地介绍了MSTP技术。     

移动本地分组传送网组网探讨

结合移动3G网络、移动互联网以及集团数据专线业务等建设需求,介绍了移动运营商在建设全业务网络时,本地传送网的网络建设工程的实践经验.探讨了采用PTN(分组传送网)组网时面向全业务接入的PTN组网策略、组网原则,并介绍了方案的实施和效果.     

新形势下集团客户专线业务接入组网技术应用分析

本文针对运营商集团客户专线的接入网络,从组网技术、应用场景,建设规范三个方面阐述了新形势下集团客户专线业务的组网技术.     

MSTP综合专线业务解决方案

在分析了大客户业务需求及专线网络的发展基础上,指出MSTP是现阶段理想的综合专线网络技术。详细阐述了MSTP提供TDM专线、以太网专线、ATM专线等各类专线接入能力及技术特点、MSTP专线业务的端到端管理以及MSTP专线的业务保护。最后总结了MSTP技术发展及设备应用状况。     

特大城市郊区PTN网络覆盖方案研究

特大城市的郊区专线覆盖是网络建设中的重点和难点。根据PTN(分组传送网)网络的特点,结合郊区地域广、资源紧张等特征以及用户专线业务需求,文章针对性地提出了基于PTN网络的特大城市郊区专线覆盖方案。方案从资源利用率、安全性、维护便利性以及可扩展性等四个方面进行阐述,并围绕PTN网络技术特点和解决方案,对各类业务部署方式进行归类分析,提出具体优化建议。     

汇聚型协议转换器在CMNet中的应用

1概述 1.1CMNet数据专线现状 目前石家庄移动的CMNet数据专线主要是为了满足集团客户数据宽带业务的应用。由于集团客户分布在城市的不同区域,甚至在县区及农村,因此要求CMNet数据专线能够覆盖到这些区域。显然,利用石家庄移动建设多年的SDH网络是发展CMNet数据专线业务的最佳选     

北电网络电信级以太网成功案例

介绍了上海信网以太专线业务成功案例和重庆网通以太专线业务成功案例。展示出电信级以太网CE（Carrier Ethemet）正逐步成为业界最为突出的关键热点。     

Packet-aware transport for metro networks

Today's metro networks have evolved from the need to support traditional voice and private line services. However, the tremendous growth in access to frame relay, ATM, IP, and Ethernet services, coupled with the desire of enterprise customers to interconnect via Ethernet interfaces, suggests the need for a new approach. This article proposes a new architecture for packet-aware transport networks (PATN) that supports both packet and traditional TDM services and leverages an assemblage of emerging technologies to provide efficient aggregation and switching of packet traffic in metro networks. The PATN has the potential to provide significant cost savings to carriers by reducing the number of network elements, reducing transport costs through statistical multiplexing, and eliminating the need for redundant multiplexing operations.     

移动互联网时代充值支付在新渠道快速上线的体系分析

随着网络的快速发展和手机功能的不断强大,互联网发生了用户习惯的大改变。为了更好地适应顾客消费习惯的改变,以服务赢得用户、跟随用户的步伐拓展渠道成为中国移动当前业务发展的新方向,秉持为客户提供最便利的服务的宗旨,开展建设互联网充值新渠道。文章以中国移动为例,介绍了其互联网时代充值支付在新渠道快速上线的体系,并结合当前形势进行简单的分析。     

MSTP设备拆除挖潜建设策略探讨

MSTP是一种基于传统SDH技术,同时实现TDM、ATM、以太网等多种业务的接入、处理和传送功能,并提供统一网管的多业务节点的城域网传送技术。本文从MSTP业务承载现状出发,通过业务需求和案例分析提出MSTP和IP RAN协调发展的网络建设模型和MSTP设备拆除挖潜建设策略。对于未来MSTP网络定位建设具有一定的指导意义。     

商业楼宇光纤网络建设方案介绍

本文从商业楼宇光纤网络建设为切入点,对宽带接入和大客户专线接入的建设原则和建设模式进行了详细的阐述,为快速建成全光网络城市、推进宽带升级提速工作,提供了科学的依据。     

An autonomous recovery mechanism against optical distribution network failures in EPON

Ethernet Passive Optical Network (EPON) is chosen for servicing diverse applications with higher bandwidth and Quality-of-Service (QoS), starting from Fiber-To-The-Home (FTTH), FTTB (business/building) and FTTO (office). Typically, a single OLT can provide services to both residential and business customers on the same Optical Line Terminal (OLT) port; thus, any failures in the system will cause a great loss for both network operators and customers. Network operators are looking for low-cost and high service availability mechanisms that focus on the failures that occur within the drop fiber section because the majority of faults are in this particular section. Therefore, in this paper, we propose an autonomous recovery mechanism that provides protection and recovery against Drop Distribution Fiber (DDF) link faults or transceiver failure at the ONU(s) in EPON systems. In the proposed mechanism, the ONU can automatically detect any signal anomalies in the physical layer or transceiver failure, switching the working line to the protection line and sending the critical event alarm to OLT via its neighbor. Each ONU has a protection line, which is connected to the nearest neighbor ONU, and therefore, when failure occurs, the ONU can still transmit and receive data via the neighbor ONU. Lastly, the Fault Dynamic Bandwidth Allocation for recovery mechanism is presented. Simulation results show that our proposed autonomous recovery mechanism is able to maintain the overall QoS performance in terms of mean packet delay, system throughput, packet loss and EF jitter.     

Ethernet-based public communication services: challenge and opportunity

Enterprises and residential customers increasingly take advantage of more sophisticated applications and evolve their business models. At the same time service providers face declining revenues from existing connectivity services. SPs respond to these trends and start to offer highly customized, high-bandwidth network services that complement and interwork with their existing leased line, ATM, or frame relay offerings. Ethernet is quickly becoming the customer UNI of choice. Ethernet, being a packet-based technology, complements IP-based services such as content, voice, data, video, and additional value-added services over a high-speed access connection. Ethernet also provides a flexible high-speed connection to the SP network and eliminates access bottlenecks. Using Ethernet as the common access interface, providers can employ flexible transport services that enable additional value-added services at layer 3 and above. At the same time the rollout of Ethernet services also challenges the installed base, given that bandwidth per customer is usually much higher and additional attributes for tight SLAs apply. This calls for an updated approach to network deployment and rollout: networks need to be planned and built in a service-centric fashion. Starting with a brief look at the driving forces for Ethernet-based public communication services, this article identifies five generic services for Ethernet MANs/WANs and discusses related deployment issues of the different service options, such as the degree of customization, geographic reach and bandwidth profile of the service, as well as evolution aspects of the installed base.     

Multiservice Ethernet access

Ethernet is evolving from its origins in the local area network into a cost-effective and reliable wide area network technology. Market research shows that business customers are moving away from traditional leased lines and selecting Ethernet as the access network technology of choice due to its low cost, simplicity and flexibility. Developments in Ethernet technology are now offering service providers the opportunity to deliver cost-effective carrier class Ethernet services. In particular, a new generation of Ethernet network termination equipment (NTE) is emerging which provides remote management, flexible bandwidth and fault diagnosis while supporting access to multiple services delivered over a single physical connection. This paper describes the advantages and potential cost savings of using Ethernet in the access network. A case study for a city demonstrates significant capital expenditure cost savings and highlights the advantages of using new Ethernet NTEs, which can be up to ten times cheaper than SDH technology, delivering equivalent bandwidth. Remote management and fault diagnosis features can also reduce operational expenditure by avoiding unnecessary site visits. A network architecture is presented which supports delivery of Ethernet services over a combination of circuit-switched and packet-switched domains. New standards which are maturing in the IETF, IEEE and ITU to support Ethernet delivery of interoperable services with carrier class reliability are also discussed.     

基于决策树的数据挖掘在电信CRM中应用研究

针对电信CRM中“数据丰富但知识贫乏”现象，提出数据挖掘技术，利用SUQ决策树构造算法建立一棵决策树模型，在CRM中根据客户的年龄、所属城市和性别对客户分类，预测客户类型，防止用户流失，争取新用户具有重要意义。     

EPON在广电HFC网络双向改造建设中的应用

介绍了有线电视网络几种传统双向改造技术后,研究了如何将EPON这种基于以太网的无源光网络技术应用到有线电视HFC网络改造中,以最低的代价实现传统HFC网络的双向改造,同时指出了在应用中应该注意的几点问题,为当前及今后我国有线电视网络双向建设开辟了一条网络发展新路。     

千兆以太网测试设计与实现

随着城域网数据业务的增多和功能的增强，以太网服务在网络服务市场占据了主导优势，为了适应以太网专线、SDH上的以太网、多业务传送平台及光纤通道、VoIP及NGN等各种业务测试发展的需要，有必要针对千兆网络进行标准测试．文中主要介绍了千兆以太网测试的技术指标，提出一种测试方案，并给出具体的实现方法。