分组增强型OTN设备实现及组网研究

分组增强型光传送网(OTN)技术作为一种融合技术,能够满足快速增长的带宽和多业务差异化的承载需求.介绍了分组增强型OTN技术的标准进展,分析了分组增强型OTN设备架构和可能的实现方式,探讨了分组增强型OTN技术在城域网的组网架构.     

试论分组增强型OTN的发展及应用

分组增强型OTN是主要对光传送网社会中的引入是未来传送网技术发展的新方向。文章主要是为了对分组增强型OTN设备的功能特点以及需求,提出了多种设备在城镇发展中的应用,由此来解决和分析分组增强型OTN所面临的新的发展要求。     

分组增强型OTN技术现状及其在城域网中的应用

分组增强型OTN技术的发展是为了满足快速增长的带宽和多业务承载需求.介绍了分组增强型OTN技术的特点和发展现状,分析了分组增强型OTN技术在城域网中的主要应用场景,探讨了可能的解决方案.     

浅谈分组增强型OTN网络的部署策略

随着政企专线市场的持续扩张，各运营商之间的竞争也越来越激烈。快速响应客户需求，占据政企专线市场高地，成为所有运营商的目标。文章分析当前各运营商承载政企专线业务的网络短板引出分组增强型OTN（光传送网）技术，介绍分组增强型OTN技术主要特点。针对现网网络存在问题，分析政企专线业务需求，分别从网络架构、节点选择、建设思路及业务承载等多方面提出分组增强型OTN网络部署策略。     

面向IP的分组传送网发展思路

业务IP化触发了新一代光传送网——分组传送网的兴起,业务IP化对光传送网提出了更大带宽传送、更加灵活组网等新挑战。实现IP与传送融合的分组传送网定位于满足IP业务的高效传送、灵活组网、高可扩展性和高可靠性等方面。分组传送概念在不同发展阶段和不同网络层次所表现的形式不尽相同,在骨干网主要表现为IP over波分复用（WDM）／光传送网（OTN）／可重构光分插复用（ROADM）的大带宽传送,而在城域网范围主要表现为以传送多协议标签交换（T—MPLS）和电信级以太网（CE）为代表的分组交换和传送技术。     

某移动分组化城域OTN与PTN融合组网

OTN( 光传送网) 和PTN( 分组传送网) 作为新兴的技术,将在下一代的城域网中发挥中流砥柱的作用.从技术角度而言,OTN+PTN 联合组网模式已经完全可行,并且在很多省市的建设中得到了充分的验证,本文就某移动在全业务承载网建设过程中采用的OTN 与PTN 融合组网应用解决方案遇到的问题做一些探讨.     

OTN电交叉技术及组网应用分析

光传送网（OTN）技术正逐步取代SDH／MSTP、WDM技术,成为光传送网主流技术。本文在对OTN电交叉技术和设备以及国内运营商网络业务需求特点进行深入分析的基础上,提出了采用OTN电交叉技术组建环形网和网状网的建设方案。     

分组增强型OTN技术浮出水面

随着PFN和OTN的应用与推广,能否实现OTN、PTN的进一步有机融合,以方便网络运维、减少传送设备种类、降低网络综合成本,成为运营商关注的重点。而正是在这一需求的推动下,分组增强型光传送网（POTN）技术出现。     

分组增强型OTN在福建电网组网方式探讨

本文介绍了分组增强型OTN技术现状,分析了电网生产业务、营销业务以及企业管理业务需求,探讨了分组增强型OTN组网需要考虑的网络分层架构、设备功能需求以及设备选型等方面的关键问题.最后针对智能电网业务特点和发展趋势,给出了分组增强型OTN技术在福建电网的组网案例.     

分组增强型OTN设备实现及级网研究

分组增强型光传送网(OTN)技术是一种融合技术,可满足迅速增长的带宽需求.并且,对于客户的多种业务需求也能进行满足.目前,由于宽带、专线以及移动数据等业务的迅速发展,城域网的压力也越来越大.在这种情况下,一些运营商在对数据网络进行积极网络以及对网络架构进行积极优化的同时,也开始对传输网技术进行了探索.OTN技术可对层间适配进行积极增加,进而使其形成层次化的结构,现今已经成为研究的热点以及重点.本文主要对分组增强型OTN设备实现以及级网进行了研究.     

光分插复用网元节点的设计和实验研究

提出了一种用于光传送网（OTN）的光分插复用（OADM）网元（NE）节点的体系结构，采用模块化方法，划分并设计出各功能模块。研制出可以同时支持8个波长动态分插复用的可重构OADM NE节点，提供2个双向全光网接口和网络管理接口。     

Modeling and performance analysis of IP access interface in optical transmission networks with packet switching

The article analyzes the influence of the Internet Protocol (IP) access interface on the packet loss probability and delay times in the optical packet switched network. The network and node model have been proposed, and the structure of the IP access interface, including assembler and holder, have been included in the analysis. It has been shown that the increase of the maximum optical packet sizes, as well as use of the holding feature as contention resolution mechanism, decrease the packet loss probability, but introduce delays at the optical network access points. Modeling and analysis were based on the discrete event simulation assuming self-similar traffic sources. IP packet lengths were modeled using empirical data. This work has been conducted while the author was affiliated with the Telecommunication Laboratory, Swiss Federal Institute of Technology (EPFL-STI-ITOP-TCOM), Lausanne, Switzerland     

PTN网络删探讨

随着各种电信业务的IP化,分组传送网（PTN）将逐渐替代传统传送网。分组传送网以IP技术为基础,并融合了传统传送网的优点,是一个全新的网络。对分组传送网的技术进行了分析,并根据其技术特点,从网络结构、组网方式、业务等多方面进行规划,对分组传送网的建设提出了建议。     

自动交换光网络的控制平面路由技术

自动交换光网络（ASON）控制平面的路由协议是由传统的路由协议结合光网络的特点扩展而来的。传统的路由协议包括了OSPF，IS-IS和P-NNI协议，这里则讨论了光层路由协议的模型，对传统路由协议的扩展，以及路由协议的具体设计三个方面。对传统路由协议的扩展，主要包含了如下几个方面的扩展：光链路相关的定义、带外控制信道的支持、对光网络中保护和恢复功能的支持；对分层次路由的支持；对传送网分配地址的支持。在具体设计中，讨论了协议数据包和链路广播两个方面的内容。     

分组增强型OTN控制平面技术研究

分组增强型OTN实现了分组传输网络(PTN)和光传送网络(OTN)的进一步有机融合,其网络内部综合了分组交换,VC交叉,ODUk交叉,波长交叉等不同的交换颗粒,引入智能控制层面,实现多交换颗粒、多业务适配网络环境下的资源调度,成为POTN网络应用的重要需求。本文从光传送网络智能化标准化现状出发,对POTN网络控制平面实现机制中的多层信令调度、层间资源调度策略、保护恢复机制实现等问题进行分析研究。     

MPLS-TP分组传送网与现有网络互联互通的实现

在光传送网向分组传送网演进的过程中,网络之间的互联互通是运营商关心的主要问题之一.文章简要介绍了MPLS-TP(MPLS Transport Profile)分组传送网的网络构成,分析了在多种传送网并存的情况下,基于MPLS-TP分组传送网的多层网络结构,重点讨论了MPLS-TP分组传送网与IP/MPLS网络以及SDH/MSTP网络之间互联互通的实现方案.     

全业务IP化趋势下的光传送网技术及网络建设探讨

结合三网融合、网络IP化等方面的业务承载要求,根据OTN技术特点、现有的传送网络分层关系及传送业务特征,对各层面光传送网络建设、设备类型选择以及组网建议等方面进行探讨。     

Label swapping versus label preserving in packet switched networks: Impact on the label space size

In recent years, switching and networking solutions exploiting all-optical nodes are gaining increasing interest to achieve the target of ultrawide-bandwidth and low-latency packet or burst processing. On the one hand, many prototypes, validated by experimental demonstration of all-optical label processing solutions, have been developed. On the other hand, the primitive available technology for performing label processing poses several constraints on the label structures; this in turn significantly impacts the traffic engineering aspects of such a network.In this paper, the label assignment problem is studied in a network that makes forwarding decision based on optical packet labels and formulated independently of any technology. Specifically, the problem of assigning labels to identify the label switched path (LSP) packets in a unique and disjoint way is defined, with the objective of optimally minimizing the label space size (i.e. number of labels, or bits, required to uniquely identify the LSPs). The network scenarios where (i) labels have local point-to-point significance (i.e. the label is swapped when traversing each node), and (ii) labels have end-to-end significance (i.e. the label is preserved along the LSP traversing multiple nodes) are both investigated. For both scenarios, labels can be uniquely identified at each node or at each node-port. The label assignment strategies for all the possible scenarios are investigated.Both theoretical and practical methods, i.e. integer linear programming formulations and heuristics, respectively, are used to assess the efficiency of the proposed label preserving solution. Numerical results show that, for a significant set of network topologies, the label space size increase experienced by networks with label preserving capabilities is limited or negligible in both per-node and per-port label identification.     

Light-Frames-pragmatic framework for optical packet transport: extending ethernet LANs to optical networks

In this paper, a network architecture for the realization of a pragmatic framework for optical packet transport called the light-frame (LF) framework is proposed. The architecture enables the transport of packets over optical media. While doing so, it relaxes the need for address recognition as well as high-speed switching, which are the two key hindering factors that have prevented contemporary optical packet transport solutions from being deployed. Using this framework, a tradeoff was achieved between cost (maturity in deployment) and performance (network efficiency). The idea is to create a logical topology that enables N/sup 2/ connectivity, yielding sublambda granularity, and thereby facilitating packet transport. Methods for topology discovery and conflict resolution are proposed. This paper also discusses stochastic as well as optimization analysis of the framework. The fiber resource requirements of this network solution are compared to a leading access networking solution-passive optical networks (PONs)-and cost benefits are shown. The LF concept due to its finely granular application, despite a present technological bottleneck, presents a good implementation case that allows it to be pushed for next-generation optical packet transport, especially in the access area.     

GPON技术新进展及发展趋势探讨

随着用户对带宽需求的不断增加，光传输在接入网中的作用越来越重要。当前，最有前景的光接入网方案是无源光网络（PON）技术，而吉比特无源光网络（GPON）是PON技术中最具有代表性的。简要介绍了PON的演进过程，主要对GPON的发展和技术特点进行详细介绍。从发展背景、系统结构和EPON的比较以及国内外发展现状4个方面对GPON进行介绍，并对其发展趋势进行了展望。