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ID:36349995
大小:3.17 MB
页数:83页
时间:2019-05-09
《光突发交换网络的光突发技术实现及基于TCP的网络性能分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、北京邮电大学博士学位论文光突发交换网络的光突发技术实现及基于TCP的网络性能分析姓名:焦硕申请学位级别:博士专业:电磁场与微波技术指导教师:林金桐20050901问题。仿真结果表明该方案能有效避免TcP性能的退化。◆对OBS网络环境下的TCP吞吐量进行了数学建模分析,并考虑了TCP确认的丢失对吞吐量造成的影响。仿真与计算结果的比较表明该模型的最大估算偏差在+27%范围内,而以往的数学模型基于TcP确认无丢失的假设,其计算结果与仿真结果的最大偏差达到100%。仿真结果与数值计算结果吻合,这表明本文所建立的TCP吞吐量模型能准确反映OBS网络环境下TcP性能退化的特点,可以更准确
2、地分析验证OBs网络环境下TcP的各种性能变化。关键字:光突发交换,网络同步,sDRAM绑定,交流耦合,突发模式,光接收机,TCP,退化,建模AbstractOpticaIburstsw“chingisproposedtomakegooduseofthehugebandwidthpr0Videdbydensewavelengm*divisionmul廿plexing(DwDM)technolo斟Ithasamediumswitchinggranular姆bet、veenthoseofthe叩ticalcircuitswitching(OCS)a工ldmeopticalpack
3、etsWjtching(oPS).OBSismuchmorenexjblethanOCSandmain诅inshighusageofthebandwid小intheOpticalfibeLAtthes锄etimenismorepracticablethaIlOPStechn0109y.Combiningtheadvan诅gesofthetwoOp戗calswitchhgschernesandavoidingmeirdisadVantages,oBSissuchapromisingparadigmtobecomethekeyswitchingtechnologyf醣thenex
4、t{ener“onopticalIntemet.Therearet、vokeyissuesofopticalburstswitching(oBS)technologydiscussedjnthisdissemtion.oneisthephysical1ayeftechn0109iesOfOBS,includjngt11eopticalbursttransmission,theopticalburstrecei“nga王1dtheschemeOfne“VOrksynchmnizationinOBSnetⅥ^0rks.TheoulerismeirllpactofOBSscheme
5、sOn付1euplayerprotocols.TheperforfrIancesofthefourTcPs,Taboe,Reno,NewReno姐dSack,areevaluaIedforsuchpurpose.Tobe百nwith,thehistoryoftheopticalswit洲ngtechnolo百esjsreviewed.ThenabriefintroductionofmedeVelopmentofOBSisgiven,includingttlephysicallayertechnologiesofOBSandtheissuesofsupponingTCPinOB
6、Snetworks.◆Inthesecondpanofthedisserta曲n,thephysicallayertechnologiesof0BsareinVestigated.F勰ly,the1.25Gbpsburstmodeoptical廿ansmi仕erisdes咖ed.Theextinctionratioofthetransminerjs10—15dB,thejitceris60psp-pillburstmodeand30psp-pincontinuousmode,and也elaser’sOn,ofrdelay远less血an8rIS.IIladdhioIl’t0i
7、mplcmentmeo凰ettheinOBs,amodulecalled矗m嘲升am脚心幻"c。H加地risdesignedinthetransmitcerbythe最eld—progmmmablegatearrays∽GA)a11ds”chronousDRAM(sDRAM),a11daschemee而Ⅱed-gDR4M肋阼馥略isdeVeIopedt0makeFPGAcommunica:cewithSDRAMsinful!duplexmode.Testresunsshawmat饥etimingbias
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