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• Good Medium-Good communication-Goodquality.

Each media have own characteristics in term of :-

Bandwidth

Cost

Ease of installation

Attenuation

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Guided Media(wired)

Twisted pair

Co-axial cables

Optical fiber

Unguided Media(wireless)

Wireless Technology

Microwave

Infrared waves

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o The oldest, least expensive.

o Easy to work with

o Low data rate

o Need repeater and amplifier

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Shielded Twisted-Pair Cable

STP (shielded twisted pair)

The pair is wrapped with metallic foil or braid.

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Unshielded Twisted-Pair Cable

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COAXIAL CABLE

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New medium used by private

& public companies

Provide light pipes.

Higher bandwidth> 2 gbps.

More expensive .

This used by :- TV companies.

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MICROWAVE

Line of sight between source and receivers

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INFRARED WAVES

IR having frequencies from 300 GHz to

405 THz

IR waves are used for short range

They are cheap, easy

to build.

Used in:-

Communication

Missile tracking

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