浅谈自动交换光网络技术(ASON)在城域传送网中的应用

近年来,自动交换光网络的出现使得通信网络中的业务处理得以简化,网络结构得以扁平化,为通信网络的发展带来了新的活力,可以说ASON作为城域光传送网发展和演进的一个方向已得到了通信业界的认可。本文结合对城域传送网目前现状的分析以及ASON网络的技术特点,探讨ASON技术在城域传送网中的应用策略和需要解决的问题。     

ASON网络中的DCN

本文基于国际电信联盟组织(ITU-T)相关标准,探讨了ASON网络中DCN网络特征和DCN网络在TMN和ASTN网络中的应用,以及在ASON网络中DCN网络的功能结构和要求,并对实际城域传输网络中ASON网络的DCN建设方案进行了初步的讨论。     

ASON在城域光网络中的应用

本文在介绍ASON的体系结构的基础上,简述了现在城域光网络的技术以及ASON应用于城域光网络的解决方案,最后对各大公司的解决方案进行了比较.     

自动交换光网络技术及其在城域传送网中的应用

城域传送网是近年来传送网建设的重点,ASON技术也是目前的热门技术,本文从技术特点等方面分析了ASON技术适用于城域传送网的特点,同时针对城域传送网中ASON应用较少的现实,分析了网络、技术和演进等方面的原因.     

自动交换光网络演进与移动光传输网的发展

一、前言 自动交换光网络 (ASON) 是光传输网的热点技术,移动技术的蓬勃发展对光传输网提出了更高的要求.当前的网络发展趋势是ASON技术必然率先在光传输网中的长途骨干层和城域核心层出现.通ASON智能光网络技术将核心网和综合业务传送网结合在一起,提供全新端到端的业务服务和管理模式.     

ASON演进新考虑

光网络发展趋势 光传送网逐渐从单纯的传送平台演进为一个与上层业务网紧密结合的综合网,ASON顺应光网络的演进趋势.由于技术本身的特征,ASON(自动交换光网络)技术必然率先在光传送网中的长途骨干层和城域核心层出现.在这样的潮流下,为使网络能够更为有效快速地服务于最终用户,运营商需要构筑新一代的光传送网.     

迎接未来挑战的城域传送网技术

本文分析了电信业务的发展趋势和对城域传送网技术的要求,阐述了城域传送网的发展方向,描述了网状网、VC虚级联、链路容量调整方案(LCAS)、通用成帧规程(GFP)、智能适配层技术以及ASON控制平面技术。     

城域传送网的发展方向及ASON组网所面临的问题

结合目前城域传送网技术的发展，对ASON在城域传送网实际应用中存在的问题进行探讨和分析。     

城域传输网络中ASON的应用探讨

基于目前已经成熟商用的ASON设备形态,以分层型城域传输网络为例,探讨了ASON设备的分步骤应用策略,并对ASON应用中可能存在的几个疑点进行了探讨。     

多域多层——智能传送网展望

自从AT＆T开通第一个ASON网络以来．运营商和设备制造商都对GMPLS／ASON控制平面进行了深入和广泛的研究．经过多年的努力，目前基于SDH的GMPLS／ASON网络在全球干线、城域和本地网等多个网络层面得到广泛应用，[第一段]     

智能光网络在贵阳教育城域网的应用研究

传统的教育城域网采用以SDH为基础的MSTP技术,存在管理实时性较差和带宽利用率较低等缺点,智能光网络ASON能解决贵阳传统教育城域网存在的问题.分析现有贵阳教育城域网的现状和所存在的问题,研究智能光网络在贵阳教育城域网发展中的应用.     

城域网建设的主要技术应用分析

文章从城域网的网络现状、网络结构、支撑的业务及城域网建设的主流技术应用等方面探讨了城域网的建设与发展.在现状分析中重点分析了现有城域网的缺点,进而讨论了多业务传送平台、城域波分传输和自动交换光网络3种主流城域网建设技术的特点,得出了在将来的城域网建设中切实可行的建设方法.     

自动交换光网络的发展及应用

自动交换光网络(ASON)实现光通路的自动连接和拆除,使原来的静态通路变成了动态通路。ASON具有智能化自动完成光网络交换连接的能力,通过分析ASON工作原理,着重介绍了自动交换光网络的技术特点、智能化的发展趋势,以及ASON在城域网和核心网中的应用,强调了备份路由可提高网络抗毁性能要求。     

Network architecture and signaling for wireless personalcommunications

A distributed microcellular architecture based on the IEEE 802.6 Metropolitan Area Network (MAN) is proposed, and is shown to meet anticipated personal communications service (PCS) needs. A method is presented to calculate MAN coverage in urban areas, and is used to demonstrate coverage of approximately 50 city blocks per MAN. A distributed subscriber database architecture is proposed to facilitate call setup, tracking of roamers and handoffs. To fully utilize MAN bandwidth, a quick method for the heat stations to switch on/off isochronous slots is proposed to facilitate adaptation to PCS traffic level variations. Call setup and handoff procedures are detailed. The PCS signaling overhead is calculated to be 15% of the capacity required to carry voice traffic     

自动交换光网络管理平面技术

自动交换光网络(ASON)技术是当前光网络领域研究的热点技术，但是有关ASON管理平面的研究工作和标准化才刚刚起步。本根据下一代光网络向自动交换光网络发展的趋势．介绍了与之相适应的ASON管理平面技术。本阐述了管理平面在ASON体系结构中的作用。ASON网络管理技术的新特点，重点介绍了ASON网络管理的体系结构、管理功能需求以及管理平面的接口和协议，最后结合国内外有关ASON管理平面技术的研究进展。介绍了ASON管理平面的标准化现状和未来发展．     

802.6 MAN based personal communications network over CATV plants

An infrastructure shared 802.6 MAN based personal communication network(PCN) is to be discussed. Considering the network configurations of CATV and 802.6 MAN based PCNs, a possible architecture is proposed. It is shown that the unidirectional dual buses can be implemented over star topological CATV distribution cable networks with only two cores. The design considerations related to the network capacity and the signaling loads for wireless personal communications are investigated with numerical example. The MAN partitioning is considered to extend the capacity of the network. An analytical method to evaluate the signaling loads of 802.6 MAN based PCNs is presented with a new mobility model. It is shown that the signaling traffic increased by partitioning is not the critical constraint for the feasibility of 802.6 MAN based PCN     

MSTP与ASON融合构建新型城域网

MSTP技术是城域网的首选方案.本文从MSTP技术的最新进展出发,简单介绍了MSTP中采用的     

云化IP城域网中vBRAS池化部署研究

云网融合/云网一体已成为IP承载网的主要发展方向。作为最贴近用户的承载网，IP城域网拥有丰富的业务特性，是网络云化转型的重要试验田。面向多元接入、流量流向变化等网络承载需求，IP城域网从传统南北向树状架构向城域Spine-Leaf架构转型，以适应固移融合、多云接入等新型业务场景。基于云化IP城域网演进，对v BRAS池化部署方案及关键技术进行详细剖析，为v BRAS规模商用部署和技术演进提供技术参考。     

Network architecture and traffic transport for integrated wireless communications over enterprise networks

A novel network architecture based on the IEEE 802.6 metropolitan area networks (MAN) is proposed to integrate the wireless and wired segments of a regional enterprise network (REN) within a city. This architecture functions like a distributed switch for all types of services, reducing traffic congestion by sharing the high capacity link dynamically and facilitating signaling, mobility management, call processing and network management through its distributed functions, transport facilities and broadcasting capability. It also serves as a peripheral gathering network of REN traffic for transport over a wide area ATM/BISDN, enabling integration of an enterprise's regional networks into a global EN. Two major wireless applications, i.e., wireless PABX (WPABX) and wireless LAN (WLAN) are discussed to illustrate the advantages of this MAN‐based architecture. Although a REN is likely to support a wide range of different services, voice and data will continue to be the predominant traffic generated by WPABXs and WLANs, respectively, and are also representative of isochronous and asynchronous multimedia traffic carried by future wireless networks. We compare the traffic capacity of several voice transport alternatives under integrated (voice/data) network traffic with various data traffic loads, and study voice and data integration under three different integration schemes by simulations. Results indicate that the MAN‐based architecture is most effective employing queue arbitrated (QA) access for asynchronous traffic, pre‐arbitrated access for constant bit‐rate isochronous traffic, and the new reservation arbitrated (RA) access for variable bit‐rate isochronous traffic, under a scheme that permits full sharing between QA and RA traffic. This revised version was published online in July 2006 with corrections to the Cover Date.     

Optically transparent integrated metro-access network

High-capacity optical transmission technologies have made possible very high data rates and a large number of wavelength channels. Further, optical network functionality has made progress from simple point-to-point WDM links to automatically switched optical networks. In the future, dynamic burst-switched and packet-switched photonic networks may be expected. This paper describes a novel architecture of transparent WDM metropolitan area network (MAN) that is capable of switching on both packet-by-packet and burst-by-burst basis, thereby having the potential to achieve high throughput efficiency. The optically transparent MAN also includes a large part of the access network infrastructure. It is scalable, flexible, easy upgradeable and able to support heterogeneous network traffic. Some results of a preliminarly study on network performance are shown.