Presentation on theme: "Computer Science Project"— Presentation transcript:
1Computer Science Project Communication andNetwork conceptsPresented by:PoorvajaJincyAbhishek
2Contents Transmission media Data communication terminologies. twisted pair cablecoaxial cablesoptical fibersMicrowaveRadio waveSatelliteData communication terminologies.
3Transmission MediaTransmission media is also known as communication channels.They are the cables that connect two or mare workstations.Two categories:1.guided media-include cables.2.unguided media-include waves through air, water or vacuum.
4Twisted pair cableCommon form of wiring in data communication application.Voice grade medium(VGM)-basis for telephone wiring.Consists of two identical wires wrapped together in a double helix.Twisting of wires reduces crosstalk
7DisadvantagesIncapable of carrying signal over long distances due to high attenuation.Low bandwidth capabilities-unsuitable for broadband applications.max. data rates = 1 Mbps- without conditioning10 Mbps with conditioning
8Coaxial CablesConsists of a solid wire core surrounded by one or more foil or wire shields, each separated by a insulator.Inner core- carries signalShield –provides the groundSuitable for high speed communication & widely used for TV signals.TypesThicknet-can be upto 500 meters long. They are thicker than thinnetThinnet-using this cable max. distance of 185 meters can be joined.
9Advantages Disadvantage Can be used as the basis for a shared cable network.Can be used for broadband transmission.Offer higher bandwidths- upto 400 MBPS.DisadvantageExpensive.Not compatible with twisted pair cable.
10Optical fibersConsists of thin strands of glass or glass like material.Light source –LEDs or laser diodes(LDs).Bandwidth is very high.Fiber cable consists of three pieces:coreCladdingProtective coatingTypesSingle nodeMulti node
11Advantages Immune to electrical and magnetic interference. Highly suitable for harsh industrial environments.Guarantees secure transmission and high transmission capacity.Can be used for broadband transmission where several channels are handled in parallel.
12Disadvantages Installation problem- very fragile Connection looses are common problems.Cables are more difficult to solder.Light can reach the receiver out of phase.Virtually impossible to tap due to noise immunity.Most expensive.
13Comparison Table Type Type Sub type Max.Segment Length Bandwidth supportedinstallationcostInterferenceTwisted pair cableUTPSTP100 mts100 Mbps500 MbpsEasymoderateCheapestHighCoaxialcableThinnetThicknet185 mts500 mts10 MbpshardCheapModerateLowFiber optic cableMultinudeSinglenode2 kms100 kms2 GbpsVery hardExpensiveNone
14Guided media The different types of guided media are : Microwave Radio waveSatelliteThe different types of other unguidedmedia are :InfraredLaser
15cheaperFreedom from acquisition rights and other governmentalrequirementsEase of communicationAbility to communicate through oceansNo use of cablesMicro wave advantages
16Microwave disadvantages insecureSusceptible to weatherEffects like rainCost of design highImplementation trickyAntenna may split up in different pathwayMicrowave disadvantages
17Radio wave advantages Cheaper Offers mobility Offers ease of communicationFreedom from land acquisition rightsdisadvantagesReduce signal strengthInsecure communication
18Satellites advantages Area coverage is largeMaintenance easyCan cover large areas of the earthUseful in sparsely populated areas c losesDisadvantagesHigh atmospheric losesHigh investment costsSatellites advantages
19Satellite disadvantages Over crowding of bandwidthsHigh investments costHigh atmospheric losses
20other unguided mediaInfrared It uses infrared lights Used in everyday life like remotes , automotive garage doors and wireless speaker Common in pda’s Laser It is a line of sight transmission Point to point transmission It can be adversely affected by weather
21IMPORTANT CONCEPTS TO BE KNOWN A channel is the medium which is used to carry information or data from one point to another.DATA CHANNELIt is the unit of measurement for theInfo. Carrying capacity of a communication channelThis baud is synonymous with BPS another unitOf measuring data transfer rates.BAUDIt refers to the speed at which data transfer is measured. It is generally used to measure the speed of information through a high speed phone lines or modems.BITS PER SECOND
22AcknowledgementFirst and foremost, we would like to thank Kiran madam for having given us the opportunityfor expressing our ideas through this project.We would also like to thank our friends for their creative ideas without which this would have been incomplete, last but not the least, we would like to thank everyone who directly or indirectly supported us.