presentation: data communication software - role and functions

8/9/2019 Presentation: Data Communication Software - Role and Functions

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National conference on Data Communicationsheld in CSIO Chandigarh , April 7-8, 2000

NoorJahanHaqueAssociateLecturer

IETEInstituteofElectronics&TelecommunicationEngineering,Chandigarh

PreparedbyRamanK.Attri(SrScientist,CSIOChandigarh)

NoorJahanHaque(AssociateLecturer,IETEChandigarh)


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CommunicationSoftwareAreastobecovered

OverviewofDataCommunication

RoleofDataCommunicationSoftware

FunctionalAspects

of

Data

Communication

Software


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DataCommunicationOverviewDataCommunicationOverview

Transportationof

Information

from

one

point

to

anotherthroughacommunicationmedium

Inherently

linked

with

computers

and

transmission

of

media


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EvolutionofDataCommunicationEvolutionofDataCommunicationHugedevelopmentinPC

+

NetworkTechnologies


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AdvantagesofDataCommunicationAdvantagesofDataCommunication

Efficientuse

of

large

computers

improvesthemonitoringprojects

providesvariousvalueaddedservices


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ResultofDataCommunicationTechnologyResultofDataCommunicationTechnologyinformationsuperhighwayforfreeaccessibilityand

communica i ity orcommonuti itiesan services


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ComponentsofDataCommunicationComponentsofDataCommunication

Data

SourceDataSink

CommunicationMedia

ControllingCommunication

Software

Source Sink Commn Media

Communication Software


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DataSourceDataSource

Originator

of

InformationItcanbeaPC,server,remoteterminal,satelliteora

mac ine

Convert

the

data

into

the

format

suitable

for

software


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DataSinkDataSink

Receiver

of

informationItcanbeacomputeroraterminalconnectedtosource

Receivesthesignal,decodesintobits,assemblesthe

group

of

bits

and

recreate

the

originally

transmitted


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CommunicationMediaCommunicationMedia

Glues

the

source

and

sink

together

for

information

exchange

Itcan e irectca e inLAN ,mo emt roug telephoneline(inWAN),satellite, opticalfiber,


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CommunicationInterfaceCommunicationInterface

Innetwork

configuration

both

source

and

sink

are

PC,termedasDataTerminalEquipment (DTE).

TwoDTE(SourceandSink)areconnectedthrough

an

interface

termed

as

Data

Communication

DCEcanbeamodem,EthernetcardorVSAT


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Communication

Software(Transmitter)

Communication

Software (Receiver)

Data Data

CommunicationMedia

Source

DTE

Sink

DTEDCE DCE

PC Modem/VSAT/Ethernet Card PC


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ConversionofDataintoSignalDCE

Converts

Digital

Data

from

DTE

into

asignal

suitablefortransmission&viceversa

conversionfromDigitaltoAnalog&

viceversa

in

modem

Paralleltoserial&viceversainLANNetworks)


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DCEandCommunicationSoftwareDCEandCommunicationSoftwareDCE

works

in

close

association

with

Communication

SoftwareatDTEtoperformthesophisticatedfunctions:

e c en a a ow e ween e woen s

Establishmentofthephysicalconnectionbetweenthetwoend

oints

Transmissionandreceiptofalldigitalinformationthroughthephysicalcircuit

Conversionform

Digital

to

analog

and

vice

versa

ErrorDetectionandcorrection

on or ngan agnos ngo equ pmen au s


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DataCommunicationSoftware ItisacomputerprogramrequiredonDTE(PC)to

bridgethegapandinterpretthebits/bytesthataretransmittedviathecommunicationmediathrou htheinterface

Coreof

Data

Communication

is

Communication

Responsibleforcontrollingdataformatting,data

transmission,andtotalcommunicationcontrol aycomp ete yres esoncentra orparto tmaybelocatedonthefrontendcommunicationPC,a

concentrator,remoteconcentratororinintelligentterminals


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SoftwareSoftware

Defines

the

communication

parametersControlstheuseraccessibilit toinformation

optimalconfigurationofcommunicationhardware

e ec veu za ono ne wor resources


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FunctionsofCommunicationSoftwareFunctionsofCommunicationSoftware Transmissioninitiationandtermination

Establishmentoflogicalconnectionsoverphysicalline

DataTransmission&receipt

Codeconversion

ErrorDetection

DataEditing

on ro

arac er

ecogn on DataDeliveryandoutput

Transmissionmonitorin andmaintenance


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CommunicationSoftwareDesignConsiderationCommunicationSoftwareDesignConsideration

Software

Design

to

be

based

on

principles

of

modularity,hierarchyandgenerality

Designo communicationso twareis onein ormolayers,eachlayerhavingdifferentfunctions

approachhavingsetofproceduresorrulescalledprotocols


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CommunicationSoftwareDesignConsiderationCommunicationSoftwareDesignConsideration Multidimensionalstudyisinvolvedinthedesignof

ThedesigndependsuponequipmentDTE (terminal

controller,concentrator,

switch

or

host

PC)

that

would

beconnected.

Characteristicsofcommunicationmediawithrespectto

ComplexityofSoftwaredependsuponthecomplexityofnetworks


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DataCommunicationProtocolsDataCommunicationProtocols

Protocols

are

the

set

of

rules

or

the

procedure

which

arefollowedbycommunicatingdeviceswhilex x v

Protocolsprovidethestandardizationandflexible

platformsanddifferentkindsofPCs


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DataCommunicationProtocolsInternalsDataCommunicationProtocolsInternalsData

Communication

Protocols

can

be

either

Bit

Oriented orByteoriented

Bitoriente protoco transmit atainbatchesofanylengthuptospecified

Byteorientedprotocoltransmitdatain8bitblocks


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RoleofLayeringinProtocolDesignRoleofLayeringinProtocolDesign ProtocolisaCollectionofRulesforphysicalestablishment

ofcalls,identification,transmissionofdata,acknowledge

ProtocolismeantForuniversalstandardizationof

informationexchange

over

the

PC

from

different

vendors,

platformsandnetworkconfiguration

Protocolisdesignedinformsoflayer.Eachlayerisa

offunctioning.


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RoleofLayeringinProtocolDesignRoleofLayeringinProtocolDesign

Unique

functionsor

process

are

designated

to

different

layersinacommunicationprotocolandlayersincon unct onprov et ee c entcommun cat on.

LayersofDatacommunicationsoftwareensurethatthedata

is

h sicall

transmitted

user

receives

itwith

no

errors

OSImodelbasedonsevenlayersenabledevelopment

o

astan ar

t at

wou

ac tate

a

ex einterconnectionofsystemsusingdatacommunication

facilities


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OSIlayersofCommunicationProtocolOSIlayersofCommunicationProtocol Physicallayer (interconnectionthroughphysicalmedia) Datalinklayer (controlerrorfreetransmissionoverphysical

layer)

Networklayer (controlefficientroutingandpathsinthenetwork)

Transportlayer (controldatatransportabilityfromsystemto Sessionlayer (controldialogcommunicationsession) Presentationlayer (controlrepresentation&manipulationof Applicationlayer (controluserinterface )


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DataTransmissionErrorDataTransmissionError

Data

while

being

transmitted

may

suffer

damage,

errorduetothecharacteristicsofthetransmissionme umor uetoexterna stur ances

Almost

all

the

Communication

channels

are

very

errorprone o essormoreex en

Evenifabitiserroneous,thewholeofthe

Qualityofcommunicationchannelismeasuredby


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DataErrorRecoverythroughDCSDataErrorRecoverythroughDCS Recoverymethodsaremustforefficientdata

communicationro oco ec n q eens re a n orma on s

transmittedonlyandonlywhencommunicationchannelisfreeandtheappropriateterminaldevicesarereadytoreceive

Communicationsoftwareincludethemethodoftransmittertoretransmitthelostbit

CommunicationSoftwareincludetheerrordetectionandcorrectionalgorithms


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Abouttheauthor Noor

Jahan

Haque

earned

her

Masters

in

Information

technology

in

1999.SheservedatIETEasassociatefacultyfrom20002001.neeruhaque2000@yahoo.com

RamanK.Attri,MastersinTechnology(AppliedElectronics)servedasseniorscientistatCSIOChandigarhfrom19952005.HisspecializationisinInstrumentationsystems.rkattri@rediffmail.com

presentation: data communication software - role and functions

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