欢迎来到天天文库
浏览记录
ID:8326274
大小:372.00 KB
页数:23页
时间:2018-03-20
《外文翻译--章超_机械仪表_工程科技_专业资料》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、InternationalJournalofInnovativeTechnologyandExploringEngineering(IJITEE)ISSN:2278-3075,Volume-1,Issue-6,November2012SDHandItsFutureTrendsN.Jyothirmai,R.ManasaValli,A.RamaKrishnaAbstract–SDHpossessaninternationalstandardnetworkingprinciple.Itissynchronousbynatu
2、resonameofthehierarchyistakenfrommultiplexingmethod.TheevolutionofthissystemimprovingtheeconomyofoperabilityandreliabilityofadigitalnetworkSDHevolutionmeetstherequirementofthecustomerwithrespecttothedifferentbandwidthrequirementsanddifferentservices.SDHstandard
3、definesthetransmissionratedevelopedto155.52mbps.Inmultiplexingprocesspayloadsarelayeredintolowerorderandhigherordervirtualcontainer,eachincludingarangeofoverheadfunctionsformanagementanderrormonitoring.framehasarepeativestructureandconsistsofnineequallengthsegm
4、ent.EachsegmentinSTM-1possesstheinformationstructure.TheflexibilityofSDHcanbeusedtobestadvantagebyintroducinganetworktopology.Keywords-CCITT:ComiteConsultifInternationaldeTelegraphiqueetTelephoniqueSTM:SynchronousTransportModuleADM:AddDropMultiplexerPOH:PathOve
5、rHeadSOH:SectionOverHeadI.INTRODUCTIONInFebruary1988anagreementwasreachedatCCITTforaSynchronousDigitalHierarchyrepresentingasingleworldwidestandard.Fortransportingthedigitalsignal.ForsmoothtransformationfromexistingPDHithastoaccommodatethreedifferentstandardsSY
6、NCHRONOUS-OnemasterclockandallelementsynchronisewithitDIGITAL-Informationinbinary,HIERARCHY-setofbitsratesinahierarchicalorder.SDHdefinesasetofhierarchicalstructures,standardsforthetransportofsuitablyadaptedpayloadoverphysicaltransmissionnetworkAsSDHisintroduce
7、dmorewidely,themanagementcapabilityofnetworkgraduallyincreasesbecauseofthecomprehensivemonitoringandhighcapabilitymanagementthroughoutthenetwork.ThecontrolofbandwidthonatimescaleofsecondsforothermultiplexingtechniquesthathaveswitchingcapabilitiessoSDHastheirtra
8、nsportmechanism.ThefirstattempttoformulatestandardsforopticaltransmissionstartedinU.S.AasSONET(SynchronousOpticalNetwork)Theaimofthisstandardswastosimplifyinterconnectionbet
此文档下载收益归作者所有