Noise in a Network

Noise- Noise is any undesired signal in a communication circuit. Another definition calls noise unwanted disturbances superimposed on a useful signal, which tends to obscure its information content. There are many varieties of noise. However, the four most important to the telecommunication and data centers are thermal noise, intermodulation noise, and crosstalk and impulse noise.

Signal-to-noise ratio (SNR) in analog and digital communication, signal-to-noise ratio, often written (SNR) is a measure of signal strength relative to background noise. The ratio is usually measured in decibels. If the incoming signal strength in microvolts is a V in the formula and the noise level also in microvolts, is V then the signal-to-noise ratio in decibels is given by the formula. If V=V them S/N = 0. In this situation, the signal borders on unreadable, because the noise level severely computers with it. In digital communications, this will probably cause a reduction in data speed because of frequent errors that require the source computer to resend some packets of data.