Digital Signal Impairments
Digital signals are susceptible to the same impairments as analog signals when they are transmitted over analog facilities. However, they are less susceptible to most impairments. Digital transmission can be designed to correct errors automatically. For example, digital information signals between computers may be transmitted along with error-detecting codes. When an error is detected, the information is retransmitted. The impairments over a digital transmission facility are digital attenuation and echo. Digital signals are subject to attenuation or signal loss. With digital transmission, regenerators are used to reconstruct, or regenerate, the digital signal.
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