1、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 telecommunication
2、s 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
3、 。 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”，amal
4、gamation、 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
5、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 eq
6、uipment：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 th
7、e 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
8、 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
9、 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
10、 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
11、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,Subscr
12、iber 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 of
13、fice 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,ESC,Telecommunication network Technology Development Trend,
14、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
15、 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 TVnetwork, fixed and mob
16、ile 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 Household Network (WLAN, Bluetooth, UNB),Super-speed Intelligent Optical Network,Network Security
17、and Emergency Communication Technologies,RFID, Sensor Technology, Biology Technology, grid. Future communication demand challenge science and technology.,Postal Communication Network,Postal communication A type of communication which is an integrated production technological complex of technical and
18、 transportation means which provides the receipt, handling, transportation and delivering of postal items as well as postal money transfer. Postal communication network - A unity of postal communication objects and postal routes. Postal Communication Network Architecture ： Material transmission netw
19、ork：Material network or Nordic Network Integrated Computer Network： Functional levels： Postal communications network consists of a physical network, operational norms and operation control system. Physical network is the material basis for the production operation. operational norms is the norms of
20、Production Operation. Operation Control System, the implementation of Operation Monitoring and control to ensure reliable operation of the whole network to ensure smooth production Post.,Material transmission network,Network consists Postal material transmission is a network system for mails transfe
21、r and material logistics under the supervision and control of control system in accordance with operational norms organized by the postal business, mailing office, reach facilities, mail processing center and Postman (including Mail Tools) according to certain principles and modalities. Network orga
22、nization mode Postal district center office system Postal Communication Network sketch map Postal Material transmission network layers and types layers：National Route (backbone) Network，Provincial Network，Postal district Material transmission network Types:（In accordance with the transmission speed
23、）：Courier Network，General Parts Network,Post integrated computer network,Consists of Physical networkSoftware systems Physical Structure Backbone Network within the province local area network Software systems For the Completion of the information collection, processing, application, storage capabil
24、ities.,Post integrated computer network,Postal Communication Network,Postal Material transmission network layers and types layers：National Route (backbone) Network，Provincial Network，Postal district Material transmission network Types:（In accordance with the transmission speed ）：Courier Network，General Parts Network,Postal district center office,Postal district center office,ESC,Material network: Urban and rural coverage,Information network：Security and convenient,
