Feb 3rd, 2012
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A short note about TransmissionMedia .A transmission medium is a material substance (solid, liquid, gas, or plasma) that can propagate energy waves. For example, the transmission medium for sounds is usually air, but solids and liquids may also act as transmission media for sound.

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Data and ComputerCommunicationsTransmission MediaPrefaceguided - wire / optical fibreunguided - wirelesscharacteristics and quality determined by medium and signalin unguided media - bandwidth produced by the antenna is more importantin guided media - medium is more importantkey concerns are data rate and distanceDesign FactorsBandwidthhigher bandwidth gives higher data rateTransmission impairmentseg. attenuationInterferenceNumber of receivers in guided mediamore receivers introduces more attenuationElectromagnetic SpectrumTransmission Characteristics ofGuided MediaFrequencyRangeTypicalAttenuationTypicalDelayRepeaterSpacingTwisted pair(with loading)0 to 3.5 kHz0.2 dB/km @1 kHz50 s/km2 kmTwisted pairs(multi-paircables)Coaxial cable0 to 1 MHz0.7 dB/km @1 kHz5 s/km2 km0 to 500 MHz7 dB/km @ 10MHz4 s/km1 to 9 kmOptical fiber186 to 370THz0.2 to 0.5dB/km5 s/km40 kmTwisted PairTwisted Pair - TransmissionCharacteristicsanalogneeds amplifiers every 5km to 6kmdigitalcan use either analog or digital signalsneeds a repeater every 2-3kmlimited distancelimited bandwidth (1MHz)limited data rate (100MHz)susceptible to interference and noiseUnshielded vs Shielded TPunshielded Twisted Pair (UTP)ordinary telephone wirecheapesteasiest to installsuffers from external EM interferenceshielded

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