通信经济学（第2版） 英文版 chapter 3 Communications Network

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1、Chapter3CommunicationsNetworkⅠTheoreticalfoundationofCommunicationsNetworkⅡTelecommunicationsNetworkⅢThedevelopmentofTelecommunicationsNetworkⅣPostalCommunicationsNetworkanditsdevelopmentCommunicationsNetworkConcept:Atelecommunicationsnetworkisanetworkoftelecommunicationslinksandnodes

2、arrangedsothatmessagesmaybepassedfromonepartofthenetworktoanotherovermultiplelinksandthroughvariousnodes.TelecommunicationsNetwork、PostalCommunicationsNetwork，Two-waynetwork．Consistsof:Communicationpoints：CommunicationpointsandCommunicationsnodes。Communicationlinks:composinginformatio

3、ntransmissionchannelsbetweenthepointsofCommunicationsNetwork.Whichincluding:traditionalCommunicationsNetwork：relativeindependent、compartmentaloperation(Segmentationoperation).Moderncommunicationsnetwork——“InformationSuperHighway”，amalgamation、integrationisthetide.LANArchitectureandTop

4、ologiesnettynetworkStarnetworkringnetworkbus-networkcomplexnetworktreenetworkCellularNetworknettynetworkStarnetworkRingnetworkbus-networkcomplexnetworktreenetworkCellularNetworkPhysicalNetworkPhysicalNetworkisthepracticalnetworkconsistsofhardequipmentofthetelecommunicationsnetwork.Fro

5、mtheinsightofphysicallayer,thetelecommunicationsnetworkconsistsofthreemajorsystems:auserequipment,transmissionsystemsandswitchingsystems.WhichCanbepresentedbyasimpleschematic.Userequipment：phoneequipment、Datacommunicationsequipment、andVideoTerminal.Transmissionsystems：themeansbywhichi

6、nformationtravelsthroughthenetwork,comprisingthetransmissionmediumandtransmissioninterfaceequipment.Switchingsystems：themeansbywhich(temporary)connectionsbetweenthecallingpartyandthecalledpartyareestablished.sketchmapfortelecommunicationnetworkswitchspeciallinesatelliteMicrowavetrunkl

7、inephonefaxlocalswitchlong-distanceTandemswitchcomputerfibertrunklineCombinedsetuserequipmentuserlooplocalexchangetrunklinelong-distanceexchange返回ServiceNetworkPSTNPSTN,thePublicSwitchedTelephoneNetwork,isacircuit-switchednetworkthatisusedprimarilyforvoicecommunicationsworldwide,withm

8、oreth