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William Stallings Data and Computer …
1 William StallingsData and Computer Communications7thEditionChapter 4 Transmission MediaOverview Guided - wire Unguided - wireless Characteristics and quality determined by medium and signal For guided, the medium is more important For unguided, the bandwidth produced by the antenna is more important Key concerns are data rate and distance2 Design Factors Bandwidth Higher bandwidth gives higher data rate Transmission impairments Attenuation Interference Number of receivers In guided media More receivers (multi-point) introduce more attenuationElectromagnetic Spectrum3 Guided Transmission Media Twisted Pair Coaxial cable Optical fiberTransmission Characteristics of Guided Media Frequency RangeTypical AttenuationTypical DelayRepeater SpacingTwisted pair (with loading)0 to dB/km @ 1 kHz50 s/km2 kmTwisted pairs (multi-pair cables)0 to 1 dB/km @ 1 kHz5 s/km2 kmCoaxial cable0 to 500 MHz7 dB/km @ 10 MHz4
1 William Stallings Data and Computer Communications 7th Edition Chapter 4 Transmission Media Overview • Guided - wire • Unguided - wireless • Characteristics and quality determined by
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