COMPUTER NETWORKING

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PHYSICAL LAYER AND TRANSMISSION MEDIA

INTRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
High SNR means
A
Signal more corrupted by Noise
B
Signal less corrupted by Noise
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -A signal-to-noise ratio over 0 dB indicates that the signal level is greater than the noise level. The higher the ratio, the better the signal quality.

Detailed explanation-2: -SNR is defined as the ratio of signal power to the noise power, often expressed in decibels. A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise.

Detailed explanation-3: -The higher the SNR value, the better is the output. The reason is that there’s more useful information (signal) than unwanted data (noise) in a high SNR output. For instance, an SNR of 100dB is better than 70dB.

Detailed explanation-4: -Generally, a signal with an SNR value of 20 dB or more is recommended for data networks where as an SNR value of 25 dB or more is recommended for networks that use voice applications.

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