第5章 internet technologies and their applications in bas

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1、BuildingAutomationSystem§5InternettechnologiesandtheirapplicationsinBASLecturer:DouLiqianInternettechnologiesandtheirapplicationsinBASStructureofthecourse•5InternettechnologiesandtheirapplicationsinBAS5.1Principlesandtechnologiesforlocalnetworks5.2BAScommunicati

2、onstandardsInternettechnologiesandtheirapplicationsinBASStructureofthecourse5.1Principlesandtechnologiesforlocalnetworks5.1.1LANcharacteristics5.1.2NetworkprotocolandOSIreferencemodel5.1.3Mediumaccessmethods5.1.4AnoverviewofLANstandards5.1.5ExamplesofLANtech

3、nologiesinapplications5.1.6Wirelesstechnologies5.1.1LANcharacteristics1whyneedLANinBAS(1)IntegrationisoneofthemainfeaturesofBASandIBssystemintegrationFunctionintegration(2)LANaretheprimarychoicefortheintegrationofsuchlargenumbersofstationsordevicesinabuilding5.1.1

4、LANcharacteristics1whyneedLANinBAS(3)AdvantagesintegratedeviceswithinashortdistanceLANshavebeenusedfordatatransmissionamongthestationsordevicesinthenetworks,anditisalsonormalnowadaystotransmit(digitalized)imagesignalsandvoice.Manyofcontrolandmanagementfunctionscanb

5、eimplementedviaLAN.ThispartintroducesthebasicprinciplesofLAN,LANtopologies,theOSIreferencemodel,LANprotocols,mediumaccessmethodsandsometypicalLANtechnologiesforBAS/IBapplications.5.1.1LANcharacteristics2WideareanetworkandlocalareanetworkWANsandLANsaredistinguishedo

6、nthebasisofgeographicaldistributionofthedevicesinthenetworks.5.1.1LANcharacteristics2WideareanetworkandlocalareanetworkWANsprovidecommunicationsoveralongdistanceandhavenogeographicalboundary.LANs(1)LANwillbeoverasmallgeographicdistance,normallyasinglebuilding,oratm

7、ostacampus.(2)LANwillusuallybeprivatelyowned.(3)LANhavehigherdatatransferratesofsomewherebetween10Mbpsand1Gbps,andlackofaneedforleasedtelecommunicationlines.(4)CurrentLANsaremostlikelytobebasedonEthernettechnologyandusetheIEEE802.3protocol(5)Devicescanbeconnectedby

8、twisted-pairwire,coaxialcables,orfiberopticcables5.1.1LANcharacteristics3CentralizednetworksanddecentralizednetworksTwogeneraltypesofcomputercont