Explain why noise and interference have a more serious impact on an analog trans

Question

Explain why noise and interference have a more serious impact on an analog transmission line (like a telephone link) than on a digital transmission line. Explain why noise and interference have a more serious impact on an analog transmission line (like a telephone link) than on a digital transmission line. Explain why noise and interference have a more serious impact on an analog transmission line (like a telephone link) than on a digital transmission line. Explain why noise and interference have a more serious impact on an analog transmission line (like a telephone link) than on a digital transmission line.

Explanation / Answer

General (Non technical ) explanation: This was the whole motivation behind the physics stalwarts and electronic community to evolve from Analog to Digital Noise is an undesirable sound When you make a telephone call over a noisy analog line, whatever the person speaks from the other end will be heard along with so much sound ( like grrrrrrr, grrrrrrrrr) and you can hardly make out what he/she is saying same effect for him/her also some times - we call it a bad line in lay man’s terms Technical Explanation: Signal to Noise Ratio (SNR) = Signal / Noise (in simple terms, SNR = Good / Bad) SNR is inversely proportional to the distance For example, if you from New York 42nd street to the 43rd street ( just less than a mile apart), you may not get much noise on the analog line But if you call from the same New York 42nd street to Oxford Street in NewZealand (south of Australia) which are at least more than 10,000 miles apart, you will certainly get lots of annoying noise on the analog line Hence SNR gets weaker and weaker as the distance becomes longer and longer But the digital line does not suffer this problem, thanks to the repeaters. The repeaters will boost the signal but not the noise hence digital is noise free and the speech is very clear over a digital line Unit of measurement = decibels The transmission waves are square in digital but they are not the same in analog Analog signals rely on amplifiers to boost the signal Digital signals utilize the repeaters to boost them The amplifiers do not know the difference between the good and bad that means they amplify the noise as well Hence in an analog both the signal and the noise gets amplified But the repeaters boost just the signal but not the noise Repeaters are of advanced prototype than the old amplifiers Example scenario: (Source) Calling station: 42nd St, New York (Destination) Receiving station: Oxford St, New Zealand Approximate Distance = 10,000 miles For every 200 miles, around 500 mV of noise is added or for every 50 miles, around 250 mV of noise is added The amplifiers will amplify this noise as well But the repeaters will amplify only the signal and the noise will get attenuated and will drop on their own Hence Digital is the technology for the future Digital suppresses the noise better than analog

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