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OnthecomputernetworktelephonecommunicationsystemofatelephoneterminalWritepapersNetwork:[PaperKeywords]computernetworktelephonecommunicationtelephoneterminaldesignideas[Abstract]telephonecommunicationasamajorcommunicationstechnology,nowwidelyusedtogetpeopleintheprocessofsocialdevelopmenthasplayedapivotalroleasthesocialandeconomicdevelopment,people’srequirementsfortelephonecommunicationstechnologyhasgraduallyimproved,suchassignalstability,improvedcallqualityrequirements,aswellastheamountofdataincreases,thetelephonecommunicationtechnologiesaremakingmajorchallengesfacingthedevelopmentofcomputernetworktelephonecommunicationtechnology,greatlyimprovestheeffectoftelephonecommunicationstechnologytopromotetherapiddevelopmentofcommunicationtechnologytelephonepaperonthepointofcalculatingthetelephonenetworktelephonecommunicationsystem12
1terminalofinquiry,pointingoutVoIPcommunicationstechnologytelephoneterminaldesignideasandimplementationmethods.Computernetworktelephonecommunicationtechnology,isthetraditionaltelephonytechnologyinnovationandcontinuity,namelytheuseofadvancedcomputernetworktechnology,signaltransmissionandreception,themoretraditionaltelephonecommunications,thecomputernetworkcommunicationtechnology,informationdisseminationphonefasteragreateramountofdatatraffic.utilizationofnetworkresourcesisalsogreatlyimproved,withaverylargevalueandpromotetheuseofspace,atpresent,thecomputernetworktelephonecommunicationtechnologiesmoreandmorepeople’sattentionandwelcome.AcomputernetworktelephonecommunicationsystemdesignComputernetworktelephonecommunicationtechnology,computernetworktechnologyistheuseofanewtypeofsignalpropagationmodesignalthroughtheUSBinterface,thephonecallisconnectedtotheterminalandnetworkequipmentand12
2terminalconnectionontheuser’sphonecalls,voiceanddatanetworkreceivingandtransmission,andultimatelytheInternettelephonecommunication.Generally,telephoneterminalapparatusbyapulsePulseCodeModulation(PCM)technology,theso-calledpulsecodemodulation(PCMtechnology,isawaytodigitizeanalogcommunicationsignalsofchange,withcomparedtoothersignalcommunicationtechnology,pulsecodemodulation(PCMtechnologyhigherchannelutilization,datalossissmaller,effectisbettercommunicationisanidealmodulationtechnique.ToachievethetelephoneterminalofthePCMstream,oftenusingUSBdatainterface,thecomputerdevicecaneffectivelybeconnectedwiththetelephoneterminal,avoicecallsignaltellstransmission,toquicklytransferthemtoacomputernode.USBinterface,effectively,toachieveacomputerperipheralsconnectedwithcomputerequipmenteffectivelyrealizedoutsideofthecomputerdatainformationintothecomputernetworkofwhicheffectivetosolvethetransportproblemsandensurethecomputernetworktelephone12
3communicationtechnologyeffectivelytoachieve,USBtechnologywithaneffectivecombinationofPCMtechnologytopromotethecomputernetworktelephonecommunicationtechnologyeffectivelytoachieve.1.1HardwareImplementationoftelephoneterminalsComputernetworktelephonecommunicationtechnology,thehardwarerequiredtoachievethefinalphoneterminaldecodesthedataandcallactivity,thehardwareisthecomputernetworkphoneterminaltelephonecommunicationsystemisanimportantcomponent.1.2MCUcontrolcircuitMCUcontrolcircuitisatelephonecommunicationsystem,computernetworktelephoneterminalhardwareispartofthecoreofthecircuittelephoneterminalequipment,mainlybythememorycircuit,CPU,inputinterfaceandanoutputinterfacecircuitcomposedoffourparts,MCUcontrolcircuitimplementscontrolofthetelephonesignalssoundincidence,realizetelephonesignaltransmission,andtobeabletodual-tonemulti-frequencyDTMFeffective12
4control,thuscompletingthecircuitacceptedandcaneffectivelycontroltheUSBinterface,readingtheuser’scallstatusinthecircuit,aswellassystemparametersread.1.3usercircuitUsercircuitisathickfilmintegratedcircuit,developedbytheMITELwork,toprovideuserswithastable26mAconstantcurrentfedtoverifytheuser’sphonetouseVoIP,telephonydialpulse,etc.datatoensurethatthenetworknormaluseofthephoneeffectistoensurethatthenetworktelephonesubscribercircuitterminalthroughtheeffectofanintegralunit,isnowabletoeffectivelysupporttheexchangeof2-4line,belongingtothecomputernetworktelephonesystemisbasedontheanaloginterface.1.4codeccircuitCodeccircuitcomputernetworktelephonecommunicationsystemisanimportantcomponent,whereinthePCMcodeccircuitofthecircuitsystem,animportantfunctionalunit,themaincomponentsofthesystemdatareceivingunithasafilter,thedatatransmissionfilter,areferencevoltagesource,12
5theinputcircuit,theoutputcircuit,alogiccontrolunit,andPCMcodeccircuits,etc.,forencodinganddecodingthedatasignal,toensuretheeffectivenessofthenetworkcommunicationsignals.1.5SoftwareImplementationtelephoneterminalTelephoneterminaldatacommunicationstoachieve,notonlyrequireshardwaresupport,alsoneedsoftwaresupport,terminalsoftwarefunctionstoachieve,tobeabletomaketheterminalhardwaretoplayitsduerole,soastoachieveinformationtransmission,signalencodinganddecoding,andultimatelycomputerVoIPcommunicationsystemfornormaloperation.Linkstofreedownloadhttp://eng.hi138.com2mainterminalsVoIPterminalsouttheprogram,themaintargetistoallowthecomputertothetelephonecommunicationsysteminitialization,includesamicrocontrollertimer,clock.USBdevicessuchasReset,initialization,thenetworkphoneterminalhavingaveryimportantsignificance.General,VoIPmainsoftwareapplicationprocess,followthe“firstinfirstout”principle,thatis,intheprocessofsettingthetablequeue12
6tasks,inaccordancewiththeordertoperformwork-relatedtasksrequireTelephoneTerminalmainfactaninfiniteloopdataquerysystem,andconstantlyupdateanddevelopquerytasktablecontents,andtobeinformedofrelatedtasksneedtobeaddressed,andthustherealizationoftherelatedtasksinthemainprogramrunningdetectedrelatedtasksneedtobeperformed,itwillhavebeenarrangedaccordingtotheprogramsubroutinesequenceoftasksworkaddressedandresolvedonebyonetaskstandardtreatment.mainkeytoa“FIFO”works,ifthetaskofthesubroutinetothelastunitofwork,andtheimplementationcycleisrepeated.2.1InterruptServiceRoutineInterruptserviceroutine,istoachievesignaltransmissiononandoff,thegeneralformofacount,thetimerisstartedfrom0,themaximumvalueis65535,andcountsthepulsesto16.384Mhz,durationofabout4ms,ifthephoneterminalequipmentusingAMBEchips,eachreceivedpacketissentintoacycleofmore20ms,whentheterminalserviceprogramafterthecountreaches5120,itispossibletoachievea20msdataterminals,thereceiversendsthe12
7packettocompletethework.2.2TasksubroutineTasksubroutine,ismainlyresponsiblefortelephoneterminalequipmentandoff-hookmachinetoachievejudgment,accordingtotheuser’scallingandcalledvariousformsofsignalreception,completetheappropriateactionandtheimplementationoftheworkwhenthephoneisinthecallingterminalequipmentAbstractmachinestate,thetelephoneterminalequipmentwillbesenttotheAMBEprogramdialtonecontroldataterminaldevicewhenthephoneisoff-hookstate,thesubroutinewillbecalledtotheUSBinterfacetosendaresponsesignal,inordertodeterminetherelevantstatetelephoneterminal.2.3TheoperationoftelephoneterminalequipmentWhenthecalldataistransmittedtothetelephoneterminaldevice,theoff-hookoperationmadebytheuser,andtheUSBinterfacewillbetransmittedtothecomputernetwork-hooksignal,whilethetelephonecommunicationnetworkcomputerwillsendadialtonetothecallerandtomaketheinformationtransmission12
8response,theusertelephoneequipmentreceivesthedatasignalandthefocusforvoicecalls.Whenthetelephonenetworktelephonesystemcallsrelatedtotheuserterminal,thecomputernetworktechnologywillmakeadirectinternalprocessing,connectedtothecalleduser,ifthecallisatelephoneterminalOtherusers,thecomputersystemwilldirecttelephonecommunicationnetworktiedtosendthecalledpartynumberandwaitforaresponse.WhentheUSBinterfacesendsbackinformationindicatesthatthecalledsubscriber’stelephoneterminalbusysignal,thecomputernetworktelephonesystemanopportunitytosendavoicemessagetoinformtheusercalleduserbusyandsendabusysignal.IfexternalusersontheInternetphonetomakeacallwhentheend-user,USBinterface,calledthesignalafterreceivingthedatawillbedecodedandreasonableanalysis,iftheuserbusy,USBinterfacetothecomputernetworkwillbefeedback-relatedtelephonecommunicationsysteminformation,andcalltheownerbusyuserfeedbackinformation,andsendphonebusy12
9toneiftheownerisaway,theuserleisure,USBinterfacewillbesenttotherelevantmessagetotheuser,andtheuserringingtipstotipsphoneusersreceiveinformation.Whenthecalleduserhearstheringingandoff-hooktomakeareaction,USBinterfacewillcommunicatetothecomputernetworktelephonesystemfeedbackinformation,andtocarryoutdatatransmissionoftherandom,VoIPvoicetransmissionfunctionoftheterminalwillopen.3summarizestheComputernetworktelephonecommunicationtechnology,thetraditionaltelephonecommunicationsandcontinuationofaninnovation,caneffectivelyimprovetheefficiencyofdatatransmissionandtelephonetransmissionspeed,thetelephonecommunicationsignalmoreclearly,thefuturedevelopmentoftelephonecommunicationtechnologydevelopmentinthecomputerOhtelephonecommunicationsystemsaretelephoneterminalwithouthavingtobuyanotherphonenetworkequipment,throughtheUSBinterfacetoconnectwithcomputerequipment,itiseffectivetoavoidthetedioustelephone12
10line,thetelephonecommunicationstechnologygreatlyreducesthecostofequipmenttooptimizetheefficiencyintheuseofcomputernetworksforsocialdevelopmentandsocialgrowthhasbeenverypositive,soweshouldpayattentiontothecomputernetworktelephonecommunicationtechnologypromotionandapplicationofadvancedVoIPcommunicationstechnologytograduallyreplacetraditionaltelephonecommunicationstechnologytoensurethattelephonetransmissionsystemstability,soastopromotetherapiddevelopmentofnetworkcommunicationtechnology.References[1]DongLeiofInternetphonetypeofevidence.ChinaUniversityofPoliticalScience,2011[2]GuofengJiangNetworktelephoneservicequalityassurancemechanism.HuazhongUniversityofScience,2011[3]LIZheng-xianKoreatelephonenetworkmarketingstrategytoenterChinaStudyForeignEconomicandTradeUniversity,2009[4]DengYongwhole.PC-PCIPtelephony(VoIP)DesignCentralChina12
11NormalUniversity,2009[5]LiuHong.NetworkphoneterminalsoftwaredesignandimplementationofElectronicScienceandTechnology,2008[6]YuXueping.SIPprotocolkeytechnologyresearchandphoneinthenetworkimplementation.ShanghaiMaritimeUniversity,2008Linkstofreedownloadhttp://eng.hi138.com12
