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

单击此处编辑母版标题样式,*,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,Chapter 3 Communications Network,Theoretical foundation of,Communications Network,Telecommunications Network,The development of,Telecommunications Network,Postal Communications Network and its development,Communications Network,Concept:,A telecommunications network is a,network,of,telecommunications,links and nodes arranged so that messages may be passed from one part of the network to another over multiple links and through various nodes.,Telecommunications Network,、,Postal Communications Network,，,Two-way network,Consists of:,Communication points,：,Communication points and Communications nodes,。,Communication links:composing information,transmission channels between the points of Communications Network.,Which including:,traditional Communications Network,：,relative,independent,、,compartmental operation(Segmentation operation).,Modern communications network,“,Information Super Highway,”，,amalgamation,、,integration is the tide.,LAN Architecture and Topologies,netty network,Star network,ring network,bus-network,complex network,tree network,Cellular Network,netty network,Star network,Ring network,bus-network,complex network,tree network,Cellular Network,Physical Network,Physical Network is the practical network consists of hard equipment of the telecommunications network.From the insight of physical layer,the telecommunications network consists of three major systems:a user equipment,transmission systems and switching systems.Which Can be presented by a simple schematic.,User equipment,：,phone equipment,、,Data communications equipment,、,and Video Terminal,.,Transmission systems,：,the means by which information travels through the network,comprising the transmission medium and transmission interface equipment.,Switching systems,：,the means by which(temporary)connections between the calling party and the called party are established.,sketch map for telecommunication network,switch special line,satellite,Microwave trunk line,phone,fax local switch long-distance Tandem switch,computer fiber trunk line,Combined,set,user equipment user loop,local exchange,trunk line,long-distance exchange,返回,Service Network,PSTN,PSTN,the Public Switched Telephone Network,is a circuit-switched network that is used primarily for voice communications worldwide,with more than 800 million subscribers.Originally a network of fixed-line analog telephone systems,the PSTN is now almost entirely digital and also includes mobile as well as fixed telephones.,Today typical PSTN:Public Switched Telephone Network for voice and data communications with both wireless and wire line access,Hierarchy of china telephone network,RC:Mobile Communication network,Reliable radio communication is crucial for border surveillance and protection.Customs uses short-and long-range radio communication equipment that includes transportable units for remote areas and waterproof sets for the marine environment.Communication is possible between Customs marine craft and commercial ships and yachts.,Mobile telecommunication system Structure,Radio Communication network Structure,DCN:Data Communication Network,A,configuration,of,telecommunication,facilities for the purpose of transmitting,data,as opposed to analog signals.,Data communication system structure,Hierarchy of china telephone network,Subscriber terminal,Local Telephone Network,Long-distance network,To International Bureau,Alternate route,Direct route,c1-c4,long-distance exchange center,c5,Subscriber Station,Tandem switch,c1,c2,c3,c4,c5,c5,ESC,Mobile telecommunication system Structure,PSTN PLMN,BS,Mobile phone,Local subscribes local office,MSC BS,“,fixed wire,”,BS,ESC,Radio Communication network Structure,Mobile communication network PLMN local network PSTN,Switching Center,MSC,tandem office,district2,MSC,area,Service area,ESC,district1,Data communication system structure,Data,Input/output,Equipment,tranmission,controller,Date Terminal Equipment,Digital Circuit-terminating Equipment,data circuit-terminating equipment,transmission channel,communicationControl,Units,central processing unit,Computer system,telecommunications circuit,Data links,ESC,Telecommunication network Technology Development Trend,Packet switch network,NGN with open architecture,Network Convergence(Triple networks convergence,fixed and mobile network convergence),Broadband multimedia mobile network(3G,B3G),Access Broadband,Mobility(FTTH,etc),Intelligent Optical Network,Networking between persons and machines,(person-to person communications,networking of person-to-machine and machine-to-machine),Future Telecom Technologies,NGN and services,NGN Numbering Addressing System(such as IPV6,ENUM,etc),Quality,Security of Services and Network),Telecom network,computer network and broadcasting,TV,network,fixed and mobile network and services appear,convergence trends,Higher speed,individualized,plug-in,seamless access,N3G technology,Future Telecom Technologies,FTTH,higher-speed and lower-cost wireless broadband