Transcription of Analog vs. Digital Transmission - WPI
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Analogvs. DigitalTransmissionCompareat two levels:1. Data|continuous(audio) (text)2. Signaling|continuouslyvaryingelectromagn eticwave |transmitwithoutregardto signalcontent Di erencein how attenuationis handled, improvingdigitaltechnology dataintegrity. Repeaterstake outcumulative problemsin easierto multiplexlargechannelcapacitieswithdigit al easyto applyencryptionto digitaldata betterintegrationif allsignalsarein , theroleplayedby phonecompaniesin datatransmission, , everyoneagreesthat ber istheway to as we prefer ber,analogcommunicationswillbe withus is characterizedby:1. Low bandwidth:It carriesa bandwidthof about3 , thesystemonlyallowssignalsbetween0-3kHzt o passthrough|allhigherfrequenciesarechopp edo .The0-3kHzspectrumcoversthemostimportant frequenciesof humanvoice,which is preciselywhatthephonesystemhasbeendesign edto Higherrorrate:Relative to LANs,theerrorrateis roughly11 ordersof magnitudehigher!
3. The digital channel carries these n-digit encodings. T1 Carrier One popular product is Bell’s T1 carrier (Figure 2-33) 1. It multiplexes 24 voice channels over one digital channel. That is, it carries 24 voice channels at the same time over one digital channel. 2. Each of the 24 analog inputs is sampled in round-robin fashion and its n-bit ...
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