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Thedesignofreliability-optimizedstructureofcommunicationsystembasedonopticalfiberringnetworkstructureJian-HongYang1,a,NingHe1,b,HaoYang1andJunPeng2,c1ResearchandDevelopmentCenter,TheSecondResearchInstituteofCAAC,ChengduP.
R.
,No.
17,SouthSection2,2ndRingRoad,China2Sichuanuniversity,ChengduP.
R.
,WangjiangRoadno.
29,ChinaE-mail:ajasongm@163.
com,b441965142@qq.
com,cjunhongpy2@126.
comwww.
caacsri.
comwww.
scu.
edu.
cnWhenopticalfiberisemployedasamediumtotransmitdatainringnetworktypologystructurecommunicationsystem,severalmal-functionalworknodesinthecommunicationsystemwillresultinmalfunctionincommunicationandlossofdata,andwilleventuallyaffectperformanceefficiency.
Thispaperintroducesareliability-optimizedstructuredesignwhichwillguaranteethecommunicationbetweennormalworknodesandmal-functionalonesandwillconsiderablyenhancethereliabilityofringnetworkcommunicationsystem.
Keywords:OpticalFiber;CommunicationSystem;RingNetwork;Reliability.
1.
IntroductionElectricalsignals(oropticalfibersignals)information-transmissionsystemisreferredtoascommunicationsystem.
Communicationsystemisanorganicwholeconsistingofsomeinteractiveandinterdependentunitswithspecificfunctionsandunifiedgoal[1].
2.
TheTraditionalOpticalFiberRingNetworkStructureTopologicalnetworkreferstothephysicalconnectionnetworkconsistingofcomputerorotherequipmentandtransmittingmediabywayofnodesandlines.
Therearetwotypesofnetworknode:oneistransfernodewhichisresponsiblefortheexchangeofinformation,includingnodeswitches,hubsandterminalcontrollerandsoon;theotherisaccessnode,includinghostcomputerandterminalsandsoon.
Linesrefertoavarietyoftransmissionmedia,includingtangibleandintangibleones.
Opticalfiberisthemediumemployedinthisnewlydesignedreliability-optimizedstructure.
Aringnetworkstructureisestablishedbyseveralworknodeswhichinthesamenetworkisconnectedendtoendtoformaclosedloop.
Thisstructureformsaloopconnectionofpublictransmittingcableinwhichdataistransmittedalongonedirectionfromnode1tonode7.
Suchnetworksareusuallycalled"tokenring"[3],asisseeninFigure1.
Fig.
1Ringtopology3.
ProblemsofTraditionalOpticalFiberRingNetwork,andReasons3.
1.
ProblemsAringnetworkcommunicationsystemisformedbyconnectingmultipleprocessingunitsend-to-endusingopticalfiberaccordingtotopologystructure[2],asinFigure1.
Whenthesystemruns,dataaretransmittedsubsequentlyfromunit1tounit7,andfinallybacktocontrollingcomputer.
Whenunit2andunit5shutdown,theentireringcommunicationsystemisopencircuit;processingunit1cannottransmitdatatohostcomputerconsistentlyalongthepathfrom1to0viathenetwork,butdirectlytransmitthedatabacktohostcomputer.
Norcanunit3andunit4transmitdatatohostcomputerbywayofthenetwork,causingthelossoftheirdata.
3.
2.
ReasonanalysisNodeequipmentsuitableforsettingupringcommunicationoftenhastwocommunicationportsAandB,respectivelystandingforinputandoutput,whoseconnectingmethodisshowninFigure2.
Fig.
2ConnectionmethodIntheconditionthateverynodeworks,dataisinputintoportAandoutputfromportB.
Whennodeequipmentshutdown,datainputandoutputcannotberealizedsimultaneously,disruptingcommunicationchainandcausinglossofdata.
Inordertoimprovecommunicationreliabilityoftraditionalringnetwork,thestructureofringnetworkcommunicationneedstobeoptimized,ensuringthefunctioningofinputandoutputincaseofshutdownofnodeornodes.
3.
3.
ReliabilityoptimizationsolutionToimprovereliabilityofringnetworkcommunication,whatcomesfirstistoaddoneredundantlinktotheoriginalcommunicationlink[4].
Ifonelinkceasestowork,redundantlinkisavailablefordatatransmission,guaranteeingthereliabilityofcommunication.
Thefailureofonelinkiscausedbythefaultofprocessingunititself,soweshouldfindawaytomakeotherdatacircumventsmoothlythemal-functioningprocessingunit(s)inthenetworkwithoutaffectingsubsequentcommunication[5].
Inaccordancewiththecommunicationfailureresultedfromthemal-functionalnodeequipment,itisimportanttooptimizenodeequipment.
Theideaofthereliability-optimizedstructuredesignistobuildaredundantcommunicationlinkintoeverynodessothatwhentheoriginalcommunicationlinkstopsworking,redundantcommunicationlinkautomaticallytakesitsplace.
Figure3showsthestructureoftraditionalopticalfibernodeequipment.
Fig.
3NodestructurebeforeoptimizationTraditionalnodeequipmentconsistsof3parts:1)optical-electronicconvertmodulemarkedasA;2)data-processingandcontrollingunitmarkedasB;and3)electronic-opticalconvertmodulemarkedasC.
Intheopticalfiberringnetwork,optical-electronicconvertmodule(A)convertsopticalsignalintoelectronicsignalandinputthelatterintodataprocessingandcontrollingunit(C).
Theprocessedelectronicsignalisthenconvertedintoopticalsignalbyelectronic-opticalconvertmodule(B)andtransmittedintotheringnetwork.
Reliability-optimizeddesignincludesthreesteps:1)toaddapassiveopticalsplittertotheopticalsignalinputoftheoriginalnodeequipment.
Sinceonlyoneopticalcommunicationlinkneedsadding,aone-into-twoopticalsplitterisemployed,asinFigure4;2)toaddanactiveopticalswitchtotheopticalsignalinputportoforiginalnodeequipment,asinFigure5,tochoosesignalcommunicationpath.
Whenactiveopticalswitchpowerson,datatransmissionchooseoriginalcommunicationlinkwhereasredundantcommunicationlinkischosenwhenproblemariseswiththeprocessingunit;3)toaddacontrollinglinebetweenthecoreprocessingunitoforiginalnodeequipmentandactiveopticalswitchsothatwhenoriginalnodeequipmentfunctions,powerissuppliedthroughthecontrollingline,enablingopticalswitchtopoweron;whenoriginalnodeequipmentshutsdownandfailstosupplypower,opticalswitchispoweroff.
Fig.
4PassiveopticalsplitterworkingschematicFig.
5ActiveopticalswitchworkingschematicThefollowingaredetailedproceduresofeachstep:Step1:Addpassiveopticalsplittertotheoriginalnodeequipment.
Whenopticalsignalentersnodeequipmentthroughthesplitter,thelattersplitthereceivedopticalsignalintotwobranches,oneconnecteddirectlytoopticalswitch,theotherconnectedtooptical-electronicconverter,readyfordataprocessingwithinthenodeequipment.
Step2:Activeopticalswitchhastwoopticalsignalinputports,namelyAandB,asisshowninFigure7.
Thedefaultofopticalswitchisthatwhenitisnotdrivenbypower,orwhenitisnotworking,theswitchisinthepositionofAandcanbeusedtoreceiveopticalsignaloutputfromopticalsplitter.
InputBofopticalswitch,however,isconnectedtoopticalsignalinputbyelectronic-opticalconvertmodule.
Step3:Whenoriginalnodeequipmentfunctions,thecontrollinglinewhichisconnectedtoitoutputvoltage,enablingactiveopticalswitchtooperate;whenoriginalnodeequipmentshutdown,thereisnovoltageoutputinthecontrollinglinesothatactiveopticalswitchstopsworking.
ThestructureoftheoptimizednodeisshowninFigure6.
Fig.
6Optimizednodestructurediagram4.
TestResultsAfteroptimization,nodeequipmentstructurehasundergoneaseriesoftest.
Tenpre-optimizednodeequipmentsandtenoptimizedonesareemployedforthetests.
Figure7isauthenticsceneforthetests.
Fig.
7TestsceneThetenpre-optimizednodeequipmentandtenoptimizedonesarerespectivelytandemconnectedintheringnetwork,allnodeequipmentsbeinglabeledinnumeralssubsequentlyfrom1to9,and0.
Acodeisaddedtothecontrollingprogramofeachequipmentwhosefunctionistooutputthecorrespondentnumberoftheconcernednodeequipmentwhenthatnodeequipmentmaintainsnormalcommunicationandnooutputincaseofcommunicationfailure.
Tohighlightthereliabilityoftheoptimizedringnetworkcommunication,theteststepsareasfollows:Tenpre-optimizednodeequipmentsaretandemconnectedintheringnetwork.
1)Makethetennodeequipmentsoperate,andchecktheoutputonthecomputer.
Iftheoutputis"1234567890",thenthetestisdoneandisreadyforthenextstep.
2)Ruindeliberatelynodeequipment3andchecktheoutputonthecomputer.
Iftheoutputis"124567890",thetestisdoneandisreadyforthenextstep.
3)Ruindeliberatelynodeequipments3and6,andchecktheoutput.
Iftheoutputis"127890",thetestisdoneandisreadyforthenextstep.
4)Ruindeliberatelynodeequipments2and9,andchecktheoutput.
Iftheoutputis"10",thetestisdoneandisreadyforthenextstep.
Second,tenoptimizednodeequipmentsaretandemconnectedintheringnetwork.
5)Makethetennodeequipmentsoperate,andchecktheoutputonthecomputer.
Iftheoutputis"1234567890",thenthetestisdoneandisreadyforthenextstep.
6)Ruindeliberatelynodeequipment3andchecktheoutputonthecomputer.
Iftheoutputis"124567890",thetestisdoneandisreadyforthenextstep.
7)Ruindeliberatelynodeequipments3and6,andchecktheoutput.
Iftheoutputis"12457890",thetestisdoneandisreadyforthenextstep.
8)Ruindeliberatelynodeequipments3,6and9,andchecktheoutput.
Iftheoutputis"1245780",thetestisdoneandisreadyforthenextstep.
9)Ruindeliberatelynodeequipments2and9,andchecktheoutput.
Iftheoutputis"13456780",thetestisdoneandisreadyforthenextstep.
10)Ruindeliberatelynodeequipments1and0,andchecktheoutput.
Iftheoutputis"23456789",thetestisdoneandisreadyforthenextstep.
ThedetailedtestresultsareindicatedinTable1.
Tab.
1TestresultsTestserialnumberTestcontentsOutputresults10pre-optimizednodesaretandemconnectedtosetuparingnetwork110testnodesworkproperly1234567890Correct2NO.
3testnodeisruineddeliberately124567890Correct3NO.
3andNO.
6testnodesareruineddeliberately127890Correct4NO.
2andNO.
9testnodesareruineddeliberately10Correct10optimizednodesaretandemconnectedtosetuparingnetwork510testnodesworkproperly1234567890Correct6NO.
3testnodeisruineddeliberately124567890Correct7NO.
3andNO.
6testnodesareruineddeliberately12457890Correct8NO.
3andNO.
6andNO.
9testnodesareruineddeliberately1245780Correct9NO.
2andNO.
9testnodesareruineddeliberately13456780Correct10NO.
1andNO.
0testnodesareruineddeliberately23456789CorrectAsisshowninTable1,withtheoptimizationofthestructureofnodeequipments,thereliabilityoftheentireringcommunicationsystemhasbeengreatlyimprovedandhassatisfactorilysolvedthecommunicationproblemwiththecurrentringnetwork.
5.
ConclusionInconclusion,thenewlydesignedreliability-optimizedstructureintroducedinthispaperguaranteesthecommunicationbetweennormalworknodesandmal-functionalonesandwillconsiderablyenhancethereliabilityofringnetworkcommunicationsystem.
Thishighlyreliablecommunicationmethodisbasedontheopticalfiberringnetworkstructureandisdesignedandtestedintheprocessoffulfillingaseriesofproject.
Thereliabilityofcommunicationcanbegreatlyimprovedbyaddingapassiveopticalsplitterandanactiveoptical-electronicswitchtoallnodeequipmentsintheringnetwork.
Thoughthereismodestincreaseinthecostoftheringnetwork,itscontributiontohighreliabilityofcommunicationoutweighs.
Sothisreliability-optimizedstructuredesignisofgreatpracticalvalueandsignificancetoprojectsdemandinghighcommunicationreliability.
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