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NetworkNetwork Design Design for e-learning for e-learning
Martin Klimo
Department of InfoCom NetworksFaculty of Management Science and
Informaticse-mail: [email protected]
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StudentStudent in learning processin learning process
Knowledge interpretation
Lectures Working groups Consulting
Knowledge database
Knowledge testing
KIS – FRI ŽU
StudentStudent in e-learning processin e-learning process
Knowledge interpretation
Lectures Working groups Consulting
Knowledge database
Knowledge testing
N e t w o r k
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General network modelGeneral network model
RadioTelevisio
n
Telefón
Internet
X.25 Frame Relay ATM
DWDM
SDH
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Basic layersBasic layers
local network
access network
terminal
service
traffic
transport backbone network
transit network
customer
IN service
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SService evolutionervice evolution
telegraphytelephonytelegraphy
facsimiletelextelephonytelegraphy
radiotelephonydatafacsimiletelextelephonytelegraphy
ISDN applicationshome bankinggreen numberstelephone cardsadditional servicesvoice bankingcall distributiontelevotingselective ringingcentrexe - mailmobile telephonyradiopagingvideo telephonyradiotelephonydatafacsimiletelextelephonytelegraphy
B-ISDN applicationspersonal numbermultimedialanguage translationIP telephonyspeech recognitionpersonal service profilesteleworkinge-business::ISDN applicationshome bankinggreen numberstelephone cardsadditional servicesvoice bankingcall distributiontelevotingselective ringingcentrexe - mailmobile telephonyradiopagingvideo telephonyradiotelephonydatafacsimiletelextelephonytelegraphy
1870 1970 1990 2000
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Basic service categoriesBasic service categories
ITU-T I.210 Recommendation
Telecommunication Telecommunication servicesservices
bearerbearerteleteleservicesservices
+supplementary+supplementarybasicbasic +supplementary+supplementarybasicbasic
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Telematic sTelematic serviceservices
ITU-T I.211 recommendation
TelesTeleserviceservices
interainteraccttiveive distributdistributionion
cconveronversationalsational rreetrievaltrieval messagingmessaging
without user without user presentation controlpresentation control
with user presentation with user presentation controlcontrol
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ServicesServices in e-learning in e-learning
Knowledge interpretation
Lectures Working groups Consulting
distribution conve
rsat
ional
mes
sagin
g
retrieval
Knowledge database
Knowledge testing
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Distributive networksDistributive networks
NetworkNetwork InformationInformationterrestrial radio speech, audioterrestrial TV speech, audio, video, textsatellite R/TV speech, audio, video, text, datacable TV speech, audio, video, text, data
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Conversational networksConversational networks
NetworkNetwork InformationInformationtelephone network speech, picture (fax),
low-speed datadata network data, text, picture,
nrt audio/videocable TV speech, dataISDN speech, audio, picture,
video, text, data
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Service aService attttribributesutes
AtAtttribributesutes::
generalgeneral
accessaccess
transfertransfer
local network
access network
terminal
service
traffic
transport backbone net
transit network
customer
IN service
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CustomerCustomerNetwork Network providerprovider
Service Service providerprovider
attribute
customer bearer
Service attributesService attributes
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CustomerCustomer attributesattributes
generalgeneral ( (service layerservice layer))
information tranferinformation tranfer (text, d(text, daata, ta, speechspeech, audio, , audio, picturepicture, video), video)
supplementary services providedsupplementary services provided quality of servicequality of service interservice capabilitiesinterservice capabilities flexibilitflexibilityy operational and commercial aspectsoperational and commercial aspects
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Customer attributesCustomer attributes
accessaccess ( (traffic layertraffic layer))
establishment of communicationestablishment of communication ((oonn demand demand, , permanentpermanent, , reservedreserved))
calling party calling party autentification and access controlautentification and access control communication configurationcommunication configuration ((point-to-point, point-to-point,
multipoint, broadcastmultipoint, broadcast)) access delayaccess delay access reliabilityaccess reliability mobilitymobility ((forwardingforwarding, , full mobilityfull mobility, , personal personal
numbernumber))
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Customer Customer attributesattributes
information transferinformation transfer ( (transport layertransport layer))
transfer securitytransfer security transfer transfer integrityintegrity symmetrysymmetry ((unidirectionalunidirectional, , bidirectional bidirectional
symmetric, bidirectional asymmetricsymmetric, bidirectional asymmetric))
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CustomerCustomerNetwork Network providerprovider
Service Service providerprovider
attribute
customer bearer
Service attributesService attributes
??????
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HorizontalHorizontal segmentationsegmentation
local
service
traffic
tranport
globalcustomer wide area
access edge backbone
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Access networks - wiredAccess networks - wired
SystemSystem Rate [Mbit/s]Rate [Mbit/s] TechnologyTechnology Range [km]Range [km]
PSTNPSTN 0,056 0,056 QPSKQPSK 1010
N-ISDNN-ISDN 0,144 - 20,144 - 2 TDMTDM 8 8
B-ISDNB-ISDN 25 / 51 / 155 / 62225 / 51 / 155 / 622 ATMATM 0,1 / 0,1 /40 / 400,1 / 0,1 /40 / 40
ADSLADSL Down 6Down 6 Up 0,64Up 0,64
DMTDMT 66
CableCablemodemmodem
Down 40Down 40 Up 10Up 10
FDDFDDQAM/QPSKQAM/QPSK
2020
IEEE 802.11IEEE 802.11 2020 OFDM, TDDOFDM, TDD 0,30,3
EthernetEthernet 10 / 100 / 100010 / 100 / 1000 CSMA/CDCSMA/CD 2,5 / 0,6 / 0,22,5 / 0,6 / 0,2
Figures above give approximate upper level
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Access networks - wirelessAccess networks - wireless
SystemSystem Rate [MbitRate [Mbit//s]s] TechnologyTechnology Range [km]Range [km]
GSM, GPRS, GSM, GPRS, HSCSD, EDGEHSCSD, EDGE
0,0096 - 0,3840,0096 - 0,384 TDMA, FDDTDMA, FDD 35 35 (less for GSM data)
IMT-2000, IMT-2000, UMTS (UTRA)UMTS (UTRA)
22WCDMA, TD-WCDMA, TD-
CDMACDMA2020
DECTDECT 22 TDMA/TDDTDMA/TDD 0,050,05
BluetoothBluetooth 0,7210,721Direct sequence, Direct sequence,
Frequency hopingFrequency hoping0,010,01
DAB DAB (audio) Down 1,5Down 1,5 OFDMOFDM 100100
DVB-T DVB-T (video) Down 8Down 8 OFDMOFDM 100100
Figures above give approximate upper level