网络通信技术概述.ppt

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2024-09-29 发布于广东
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网络通信技术概述.ppt

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CommunicationNetworksFourthMeeting

TypesofNetworksWhatisacircuitnetwork?Twopeopleareconnectedandallocatedthemtheirownphysicalpathforthedurationofthetheirconnection.Whatispacketnetworks?MessageisbrokenintomanysmallpiecesPacketsaresentseparately.Eachpackethasaheader,ContainsaddressMessagedataiscarriedinthebodyofthepacket.Amessageissuccessfullysentwhenallthepacketshavearrivedatthedestination.123123231

WhatisCommunication?TelecommunicationCommunicationatadistance,Normallycommunicationoverthetelephonenetwork.DatacommunicationEitherlocalorregionalJoinstogetherdata-usingequipmentsCommunicationnetworkSharedcommunicationnetworkSupportawiderangeofservices,Sende-mailsTransferandaccessdatafilesStatictelephonyMobiletelephonyWatchvideosequences

xLookingInsideaNetworkWhatisaclouds?Thecloudcontainsdetailthatisunnecessaryfortheuser’sunderstanding.Theusersonbothsidesofthecloudcommunicatewitheachother.Howcanwecommunicatethroughthecloudechannelisestablishedacrossthecloud.

InternationalandNationalNetworksTypesofconnectionSatellitesandCablesWhycables?Whysatellite?Internationalaccesslinks,LocatedatpopulatedareasSmallnumberoflocations,FailureEquipmentproblemsorEnvironmentalinterference.ProtectionMovingtrafficfromafailedpathprotectionpaththenewpathis

CapacityoftheNetworkLinksAsymmetricDigitalSubscriberLine(ADSL).BaseonSynchronousDigitalHierarchy(SDH),TakesblocksofdigitaldataOrganizesthemintoasignalwithahigherbit-ratesotheycanbesenttogetheronalinetransmissionsystem.SDHIsahierarchyofbit-ratesusesTDM(TimeDivisionMultiplexing)techniques.Standardizedbandwidth(bit-rate)include155Mbit/s2.5Gbit/sCross-connectisanSDHswitchConnectsignalscominginononelinktosignalsgoingoutonotherlinks.TAT-1Thefirsttrans-Atlantictelephonecabl