COMMUNICATION CHANNEL

Maryam 2486

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COMMUNICATION CHANNEL

• WHAT IS COMMUNICATION CHANNEL ?

A path through which information is transmitted from one place to another known as communication channel or medium.

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COMMUNICATION CHANNEL

TYPES OF COMMUNICATION MEDIA

GUIDED MEDIA UNGUIDED MEDIA

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TYPES

GUIDED MEDIA• Transmission of

broadcasted information within physical boundary

• Example :

Fiber optics, twisted pair cable, coaxial cable

UNGUIDED MEDIA• Data transmission

through air • It is also referred as

wireless• Example :

Microwave, radio communication satellite etc

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DIFFERENCE

• GUIDED MEDIABounded media Physical media Data transmission

through cabling media

Specific path of data signals

UNGUIDED MEDIAUnbounded mediaWireless Data transmission

through air No specific path of

data signals

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GUIDED MEDIA

fig :Coaxial cable fig :Twisted pair cable

fig :Fiber optic cables

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COAXIAL CABLE

Fig :layers surround the inner conductor

Long distance transmissionCenter wire surrounded by insulationInner conductor surrounded by 3 layers80 times greater bandwidth then twisted pair Used in T.V cables,LAN,telephone lines

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TWISTED PAIR CABLE

Two wires twisted around each otherInsulating copper wireLess bandwidth than otherTwisting reduce electromagnetic interference Two types of cablesShielded twisted pairUnshielded twisted pair cable

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TYPES

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FIBER OPTICS CABLE

Glass fibersLayer of core and claddingRefractive indexData transmission through light wavesAn insulating layerPlastic jacket

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UNGUIDED MEDIA

Fig : satelliteFig: microwave system

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MICROWAVES

Wavelength beyond the visible and radio wavesHigh towersDistance b/w towers is 30 milesWide bandwidthNo wiring requiredUsed by mobile companies

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COMMUNICATION SATELLITE

Earth station send signalsSpace station receive signalsSignals retransmitted to earth stationSignals microwave formHigh speed of data transmissionBroadcasting, mobile phones ,weather tracking etcExpensive installation

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RADIO WAVES

• Radio is transmission of radio signals at less than frequency of visible light

• Directed Waves• Noise Concurrency• Radio Wave's Directness• Unlimited Range • Interference

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