KIS – FRI ŽU

NetworkNetwork Design Design for e-learning for e-learning

Martin Klimo

Department of InfoCom NetworksFaculty of Management Science and

Informaticse-mail: martin@frkis.utc.sk

KIS – FRI ŽU

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