浅析MSTP技术对以太网业务的支持

MSTP(Multj-service Transport Platform)即多业务传输平台，它是一种城域传输网技术。将SDH传输技术、以太网、ATM、POS等多种技术进行有机融合。以SDH技术为基础。将多种业务进行汇聚并进行有效适配，实现多业务的综合接入和传送，实现SDH从纯传送网转变为传送网和业务网一体化的多业务平台。从传输网络现状来看。大部分的城域传输网络仍以SDH设备为主。基于技术成熟性、可靠性和成本等方面综合考虑。以SDH为基础的MSTP技术在城域网应用领域扮演着十分重要的角色。随着近年来数据、宽带等IP业务的迅猛增长。MSTP技术的发展主要体现在对以太网业务的支持上。以太网新业务的要求推动着MSTP技术的发展。     

MSTP承载以太网业务的组网与应用

城域以太网是目前各大电信运营商城域光传送网建设的重点.文章首先描述了多业务传送平台(MSTP)中4种类型以太网业务的基本概念、技术特点以及它们之间的主要区别,然后,结合工程实际,分别探讨了MSTP承载4种类型以太网业务的不同的组网方式、业务实现方式以及业务的应用情况.文章对于我国目前电信运营商城域以太网的建设有一定的参考和借鉴意义.     

基于OTN+MSTP混合组网模式的专线业务设计

在广泛使用基于同步数字体系(SDH)的多业务传送平台(MSTP)的基础上,引入基于密集波分复用(DWDM)系统的光传送网(OTN).在接入层采用MSTP解决业务的送达与环网的保护,在汇聚乃至骨干层采用OTN解决大颗粒业务的传送需求.该设计方案将两种截然不同的传输网络机制有机结合,为转型中的移动通信运营商在原有MSTP网络基础上快速实现大流量、大带宽的业务开通创造了条件.     

长途MSTP以太网专线业务组网研究

随着需求的不断增长,运营商开始酝酿推出长途MSTP以太网专线业务。如何在传统的传送网上提供长途MSTP以太网专线业务成为传统运营商关注的问题,本文提出并给出了该业务的组网方案,包括承载网方案和MSTP设备互通及管理方案。     

跨长途提供MSTP专线业务存在的问题和解决方案

运营商在本地网内已开通了很多MSTP专线业务,但是长途MSTP专线业务却很少,到底开通跨长途MSTP专线业务存在什么问题?如何解决?本文首先将从运营商角度进行分析,然后针对组网问题给出多种方案和建议.     

基于多业务传送平台（MSTP）的城域网组网方案浅析

首先介绍了MSTP技术的现状和发展，分析了MSTP的技术原理。接着着重探讨了第一代、第二代和第三代MSTP的城域网组网方案．同时对它们各自的优缺点进行了比较。最后阐述了现阶段MSTP在实际应用中存在的问题以及MSTP技术在城域网组网工程应用中的优化。     

关于数字广域以太网专线的实现技术方案探讨

随着宽带业务的蓬勃兴起和SDH技术不断发展,数字以太网专线技术也迎来了高速发展期。结合数字以太网专线的特点,根据各运营商目前资源的不同情况,提出了广域以太网专线的实现方案和建设步骤。     

某运营商专线业务传送网建设方案研究

随着运营商进入全业务时代,竞争日趋激烈.传统语音业务用户数量和收入增长日趋减缓的情况下,三大运营商纷纷将目光瞄向了集客专线业务.专线业务是业务创新和新技术应用的重要通道和平台,是保持业务收入增长的源泉.本文对某运营商专线业务进行分类,并对传送网建设方案进行研究.     

利用MSTP技术实现大客户接入方案

通过分析当前联通大客户传输的网络现状和存在的问题，结合基础网络的资源状况，阐述了利用先进的MSTP技术实现大客户传输的低成本解决方案；并详细介绍了组网方案、系统特点以及带来的巨大经济效益。     

双核MSTP+与PTN设备的组网方案探讨

如何保护现有MSTP(多业务传送平台)设备投资,实现MSTP网络向PTN(分组传送网)平滑演进,是运营商普遍关注的问题.针对这一问题,文章探讨了对现有MSTP设备进行分组化改造,将其升级为具有TDM(时分复用)与PTN双平面功能的MSTP+(增强型多业务传送平台)的技术方案,分析了双核MSTP+的系统架构及其与PTN设...     

集团用户专线技术的分析

集团用户的专线租用是运营商利润的重要来源，本文分析了集团用户对专线业务的需求，对几种专线业务的特点进行了分析比较，总结了其适用范围，最后介绍了专线应用的发展趋势。     

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。     

集团客户专线业务接入组网技术应用

随着我国科技的不断发展,我国的互联网技术仍在不断提升。目前,IT技术已经和通信技术结合,且功能相比原来更加全面,同时接入网络能够符合各种需求。在当前的形势下,集团客户专线对网络的要求相对较高,且集团类型的不同,提出相关要求也有所不同。因此,对集团客户专线业务进行研究,并讲述相关应用,以供参考。     

高速大客户业务承载方式探讨

在分析OTN映射复用结构、分段保护技术和白光口组网技术的基础上,给出了OTN骨干传输网层面的智能控制业务分类、本地网层面业务保护方式和骨干网与本地网的对接方式,进而给出了高速大客户业务的端到端承载方案。     

长距离管线监测系统的设计

文章介绍了长距离管线监测系统的一种设计方案，并对其系统结构、软硬件设计方法及其各层之间的通讯方式做了具体说明，指出此系统具有测点数量多、安全可靠、报警响应迅速、功耗低与现场无需供电等特点，具有很好的应用前景。     

Network Design Using SMDS and Leased Lines

In this paper we consider designing a high-speed virtual private network using a combination of heterogeneous telecommunication services. In particular, we consider mixing SMDS access lines and point-to-point digital leased lines to construct a virtual private network at minimum cost. We develop a nonlinear combinatorial optimization model and a simulated annealing algorithm to find a high-performance, low-cost network design. We compute lower bounds on cost savings from using mixed services as opposed to pure SMDS based on actual tariffs and realistic traffic.     

Efficient routing for IP subnet VLAN over Ethernet

Existing IP routing algorithms have been developed mainly for non‐VLAN networks. For these routing algorithms to work, an end station must be attached to its associated network. The introduction of VLAN has, however, allowed the physical location of the end station to be changed from time to time. Therefore, some extra mechanism is required to support routing in VLAN environment. Existing approaches have some drawbacks in terms of inefficiency in traffic forwarding and switch software complexity. In this paper, a simple and efficient method for routing over IP subnet VLAN in Ethernet is proposed. This method has been implemented in hardware and found to work correctly. Various measurements and analyses have been performed to verify the efficiency of this protocol. Copyright © 2002 John Wiley & Sons, Ltd.     

长途网络资源管理系统的总体设计

首先介绍了长途网络资源的基本特性．接着说明了长途网络资源管理系统的设计思路。然后着重阐述长途网络资源管理系统的总体设计方案。最后对长途网络资源管理系统的发展提出了几点参考意见。     

Network Design and Architectures for Highly Dynamic Next-Generation IP-Over-Optical Long Distance Networks

The DARPA CORONET project seeks to develop the target network architectures and technologies needed to build next-generation long-distance IP-over-Optical-Layer (IP/OL) networks. These next-generation networks are expected to scale 10–100 times larger than today's largest commercial IP/OL network. Furthermore, DARPA has established advanced objectives for very rapid provisioning of new IP or private line connections, very rapid restoration against up to three simultaneous network failures, and future dynamic “wavelength” services ranging from speeds of 40–800 Gigabits per second. Besides these ambitious goals, the CORONET project seeks to establish a commercially-viable network architecture that supports both commercial and government services. In this paper, we describe the CORONET program requirements, and present our initial architectures and analysis of the early phases of this long-term project. We propose a novel 2-Phase Fast Reroute restoration method that achieves 50–100 ms restoration in the IP-Layer in a cost-effective manner, and a commercially viable OL restoration method that can meet the rapid CORONET requirements. We also estimate the magnitude of the extra capacity needed to provide dynamic wavelength services compared to that of static services, and show that the extra capacity to restore a small percentage of high priority traffic against multiple failures requires a small amount of extra capacity compared to that of single failures.      

Secure Service and Network Framework for Mobile Ethernet

Secure cellular data services have become more popular in the Japanese market. These services are based on 2G/3G cellular networks and are expected to move into the next-generation wireless networks, called Beyond 3G. In the Beyond 3G, wireless communication available at a user's location is selected based on the type of the service. The user downloads an application from one wireless network and executes it on another. Beyond 3G expects core and wireless operators and allows to plug-in new wireless access. A security model that can accommodate these requirements needs to be sufficiently flexible for end users to utilize with ease. In this paper, we explain the Mobile Ethernet architecture for all IP networks in terms of the Beyond 3G. We discuss usage scenario/operator models and identify entities for the security model. We separate a mobile device into a personal identity card (PIC) containing cryptographic information and a wireless communications device that offers security and flexibility. We propose a self-delegation protocol for device authentication and use a delegated credential for unified network- and service-level authentication. We also propose proactive handover authentication using the security context between different types of wireless access, such as Third Generation Partnership Project (3GPP) and WLAN, so that the secure end-to-end communication channels established by service software on the TCP/IP are not terminated. Lastly, we raise security issues regarding the next-generation platform.